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{"parentUuid":"6a7d8941-c9bb-4cc1-844d-bd856c2ef8d1","isSidechain":false,"promptId":"85247a26-8410-4098-8a04-0c8b347d9861","type":"user","message":{"role":"user","content":[{"type":"text","text":"Base directory for this skill: /private/tmp/claude-502/bundled-skills/2.1.201/2684238bcf1286304f5b6606b16118f0/claude-api\n\n# Building LLM-Powered Applications with Claude\n\nThis skill helps you build LLM-powered applications with Claude. Choose the right surface based on your needs, detect the project language, then read the relevant language-specific documentation.\n\n## Before You Start\n\nScan the target file (or, if no target file, the prompt and project) for non-Anthropic provider markers — `import openai`, `from openai`, `langchain_openai`, `OpenAI(`, `gpt-4`, `gpt-5`, file names like `agent-openai.py` or `*-generic.py`, or any explicit instruction to keep the code provider-neutral. If you find any, stop and tell the user that this skill produces Claude/Anthropic SDK code; ask whether they want to switch the file to Claude or want a non-Claude implementation. Do not edit a non-Anthropic file with Anthropic SDK calls.\n\n## Output Requirement\n\nWhen the user asks you to add, modify, or implement a Claude feature, your code must call Claude through one of:\n\n1. **The official Anthropic SDK** for the project's language (`anthropic`, `@anthropic-ai/sdk`, `com.anthropic.*`, etc.). This is the default whenever a supported SDK exists for the project.\n2. **Raw HTTP** (`curl`, `requests`, `fetch`, `httpx`, etc.) — only when the user explicitly asks for cURL/REST/raw HTTP, the project is a shell/cURL project, or the language has no official SDK.\n\nNever mix the two — don't reach for `requests`/`fetch` in a Python or TypeScript project just because it feels lighter. Never fall back to OpenAI-compatible shims.\n\n**Never guess SDK usage.** Function names, class names, namespaces, method signatures, and import paths must come from explicit documentation — either the `{lang}/` files in this skill or the official SDK repositories or documentation links listed in `shared/live-sources.md`. If the binding you need is not explicitly documented in the skill files, WebFetch the relevant SDK repo from `shared/live-sources.md` before writing code. Do not infer Ruby/Java/Go/PHP/C# APIs from cURL shapes or from another language's SDK.\n\n**If WebFetch or repository access fails** (network restricted, timeouts, clone blocked): do not keep retrying — write code from the patterns and namespace/package tables in the `{lang}/` file, run the compiler or interpreter on it, and iterate on the error output. For statically-typed SDKs (C#, Java, Go) a compile-fix loop against local errors reaches working code faster than blocked network research.\n\n## Defaults\n\nUnless the user requests otherwise:\n\nFor the Claude model version, please use Claude Opus 4.8, which you can access via the exact model string `claude-opus-4-8`. Please default to using adaptive thinking (`thinking: {type: \"adaptive\"}`) for anything remotely complicated. And finally, please default to streaming for any request that may involve long input, long output, or high `max_tokens` — it prevents hitting request timeouts. Use the SDK's `.get_final_message()` / `.finalMessage()` helper to get the complete response if you don't need to handle individual stream events\n\n## ⚠️ API Drift — Your Training Prior May Be Stale\n\nSeveral common Claude API shapes changed in 2025–2026. If you recall a pattern from training, verify it against the `{lang}/` files in this skill before writing — the rows below are the most frequent drift points:\n\n| Area | Stale prior | Current API |\n|---|---|---|\n| Extended thinking | `thinking: {type: \"enabled\", budget_tokens: N}` | On Claude 4.6+ models: `thinking: {type: \"adaptive\"}`. `budget_tokens` is deprecated on Opus 4.6 / Sonnet 4.6 and **rejected with a 400** on Fable 5 / Sonnet 5 / Opus 4.8 / 4.7. Pre-4.6 models still use `budget_tokens`. |\n| Web search / web fetch tool type | `web_search_20250305`, `web_fetch_20250910` | `web_search_20260209`, `web_fetch_20260209` (dynamic filtering) on Opus 4.8/4.7/4.6, Sonnet 5, and Sonnet 4.6. Older models keep the basic variants; on Vertex AI only basic `web_search_20250305` is available (web fetch is not on Vertex) — see the Server Tools QR below. |\n| PHP parameter names | snake_case wire names as named args (`max_tokens`) | Top-level named args are camelCase (`maxTokens`). Nested array keys vary by feature (e.g. `'taskBudget'`, `'skillID'`, `'mcp_server_name'`) — copy the exact key from the documented example; do not bulk-convert. |\n\nThe `{lang}/` files in this skill are authoritative over recalled patterns.\n\n---\n\n## Subcommands\n\nIf the User Request at the bottom of this prompt is a bare subcommand string (no prose), search every **Subcommands** table in this document — including any in sections appended below — and follow the matching Action column directly. This lets users invoke specific flows via `/claude-api <subcommand>`. If no table in the document matches, treat the request as normal prose.\n\n| Subcommand | Action |\n|---|---|\n| `migrate` | Migrate existing Claude API code to a newer model. **Read `shared/model-migration.md` immediately** and follow it in order: Step 0 (confirm scope — ask which files/directories before any edit), Step 1 (classify each file), then the per-target breaking-changes section. Do not summarize the guide — execute it. If the user did not name a target model, ask which model to migrate to in the same turn as the scope question. |\n\n---\n\n## Language Detection\n\nBefore reading code examples, determine which language the user is working in:\n\n1. **Look at project files** to infer the language:\n\n   - `*.py`, `requirements.txt`, `pyproject.toml`, `setup.py`, `Pipfile` → **Python** — read from `python/`\n   - `*.ts`, `*.tsx`, `package.json`, `tsconfig.json` → **TypeScript** — read from `typescript/`\n   - `*.js`, `*.jsx` (no `.ts` files present) → **TypeScript** — JS uses the same SDK, read from `typescript/`\n   - `*.java`, `pom.xml`, `build.gradle` → **Java** — read from `java/`\n   - `*.kt`, `*.kts`, `build.gradle.kts` → **Java** — Kotlin uses the Java SDK, read from `java/`\n   - `*.scala`, `build.sbt` → **Java** — Scala uses the Java SDK, read from `java/`\n   - `*.go`, `go.mod` → **Go** — read from `go/`\n   - `*.rb`, `Gemfile` → **Ruby** — read from `ruby/`\n   - `*.cs`, `*.csproj` → **C#** — read from `csharp/`\n   - `*.php`, `composer.json` → **PHP** — read from `php/`\n\n2. **If multiple languages detected** (e.g., both Python and TypeScript files):\n\n   - Check which language the user's current file or question relates to\n   - If still ambiguous, ask: \"I detected both Python and TypeScript files. Which language are you using for the Claude API integration?\"\n\n3. **If language can't be inferred** (empty project, no source files, or unsupported language):\n\n   - Use AskUserQuestion with options: Python, TypeScript, Java, Go, Ruby, cURL/raw HTTP, C#, PHP\n   - If AskUserQuestion is unavailable, default to Python examples and note: \"Showing Python examples. Let me know if you need a different language.\"\n\n4. **If unsupported language detected** (Rust, Swift, C++, Elixir, etc.):\n\n   - Suggest cURL/raw HTTP examples from `curl/` and note that community SDKs may exist\n   - Offer to show Python or TypeScript examples as reference implementations\n\n5. **If user needs cURL/raw HTTP examples**, read from `curl/`.\n\n### Language-Specific Feature Support\n\n| Language   | Tool Runner | Managed Agents | Notes                                 |\n| ---------- | ----------- | -------------- | ------------------------------------- |\n| Python     | Yes (beta)  | Yes (beta)     | Full support — `@beta_tool` decorator |\n| TypeScript | Yes (beta)  | Yes (beta)     | Full support — `betaZodTool` + Zod    |\n| Java       | Yes (beta)  | Yes (beta)     | Beta tool use with annotated classes  |\n| Go         | Yes (beta)  | Yes (beta)     | `BetaToolRunner` in `toolrunner` pkg  |\n| Ruby       | Yes (beta)  | Yes (beta)     | `BaseTool` + `tool_runner` in beta    |\n| C#         | Yes (beta)  | Yes (beta)     | `BetaToolRunner` + raw JSON schema    |\n| PHP        | Yes (beta)  | Yes (beta)     | `BetaRunnableTool` + `toolRunner()`   |\n| cURL       | N/A         | Yes (beta)     | Raw HTTP, no SDK features             |\n\n> **Managed Agents code examples**: dedicated language-specific READMEs are provided for Python, TypeScript, Go, Ruby, PHP, Java, and cURL (`{lang}/managed-agents/README.md`, `curl/managed-agents.md`). Read your language's README plus the language-agnostic `shared/managed-agents-*.md` concept files. **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `agents.create` and pass it to every subsequent `sessions.create`; do not call `agents.create` in the request path. The Anthropic CLI (`ant`) is one convenient way to create agents and environments from version-controlled YAML — see `shared/anthropic-cli.md`. If a binding you need isn't shown in the README, WebFetch the relevant entry from `shared/live-sources.md` rather than guess. C# has beta Managed Agents support via `client.Beta.Agents` and related namespaces.\n\n---\n\n## Which Surface Should I Use?\n\n> **Start simple.** Default to the simplest tier that meets your needs. Single API calls and workflows handle most use cases — only reach for agents when the task genuinely requires open-ended, model-driven exploration.\n\n| Use Case                                        | Tier            | Recommended Surface       | Why                                                          |\n| ----------------------------------------------- | --------------- | ------------------------- | ------------------------------------------------------------ |\n| Classification, summarization, extraction, Q&A  | Single LLM call | **Claude API**            | One request, one response                                    |\n| Batch processing or embeddings                  | Single LLM call | **Claude API**            | Specialized endpoints                                        |\n| Multi-step pipelines with code-controlled logic | Workflow        | **Claude API + tool use** | You orchestrate the loop                                     |\n| Custom agent with your own tools                | Agent           | **Claude API + tool use** | Maximum flexibility                                          |\n| Server-managed stateful agent with workspace    | Agent           | **Managed Agents**        | Anthropic runs the loop and hosts the tool-execution sandbox |\n| Persisted, versioned agent configs              | Agent           | **Managed Agents**        | Agents are stored objects; sessions pin to a version         |\n| Long-running multi-turn agent with file mounts  | Agent           | **Managed Agents**        | Per-session containers, SSE event stream, Skills + MCP       |\n\n> **Note:** Managed Agents is the right choice when you want Anthropic to run the agent loop *and* host the container where tools execute — file ops, bash, code execution all run in the per-session workspace. If you want to host the compute yourself or run your own custom tool runtime, Claude API + tool use is the right choice — use the tool runner for automatic loop handling, or the manual loop for fine-grained control (approval gates, custom logging, conditional execution).\n\n> **Cloud-provider access.** **Claude Platform on AWS** is Anthropic-operated with same-day API parity — see `shared/claude-platform-on-aws.md` for client setup. For per-feature availability on **Claude Platform on AWS**, **Amazon Bedrock**, **Google Vertex AI**, and **Microsoft Foundry**, see `shared/platform-availability.md` — that table is the single source of truth in this skill; do not infer availability from anywhere else.\n\n### Decision Tree\n\n```\nWhat does your application need?\n\n0. Which provider?\n   ├── First-party API or Claude Platform on AWS → continue (full surface available; per-feature exceptions in shared/platform-availability.md).\n   └── Amazon Bedrock, Google Vertex AI, or Microsoft Foundry → Claude API (+ tool use for agents); see shared/platform-availability.md for per-feature support.\n\n1. Single LLM call (classification, summarization, extraction, Q&A)\n   └── Claude API — one request, one response\n\n2. Do you want Anthropic to run the agent loop and host a per-session\n   container where Claude executes tools (bash, file ops, code)?\n   └── Yes → Managed Agents — server-managed sessions, persisted agent configs,\n       SSE event stream, Skills + MCP, file mounts.\n       Examples: \"stateful coding agent with a workspace per task\",\n                 \"long-running research agent that streams events to a UI\",\n                 \"agent with persisted, versioned config used across many sessions\"\n\n3. Workflow (multi-step, code-orchestrated, with your own tools)\n   └── Claude API with tool use — you control the loop\n\n4. Open-ended agent (model decides its own trajectory, your own tools, you host the compute)\n   └── Claude API agentic loop (maximum flexibility)\n```\n\n### Should I Build an Agent?\n\nBefore choosing the agent tier, check all four criteria:\n\n- **Complexity** — Is the task multi-step and hard to fully specify in advance? (e.g., \"turn this design doc into a PR\" vs. \"extract the title from this PDF\")\n- **Value** — Does the outcome justify higher cost and latency?\n- **Viability** — Is Claude capable at this task type?\n- **Cost of error** — Can errors be caught and recovered from? (tests, review, rollback)\n\nIf the answer is \"no\" to any of these, stay at a simpler tier (single call or workflow).\n\n---\n\n## Architecture\n\nEverything goes through `POST /v1/messages`. Tools and output constraints are features of this single endpoint — not separate APIs.\n\n**User-defined tools** — You define tools (via decorators, Zod schemas, or raw JSON), and the SDK's tool runner handles calling the API, executing your functions, and looping until Claude is done. For full control, you can write the loop manually.\n\n**Server-side tools** — Anthropic-hosted tools that run on Anthropic's infrastructure. Code execution is fully server-side (declare it in `tools`, Claude runs code automatically). Computer use can be server-hosted or self-hosted.\n\n**Structured outputs** — Constrains the Messages API response format (`output_config.format`) and/or tool parameter validation (`strict: true`). The recommended approach is `client.messages.parse()` which validates responses against your schema automatically. Note: the old `output_format` parameter is deprecated; use `output_config: {format: {...}}` on `messages.create()`.\n\n**Supporting endpoints** — Batches (`POST /v1/messages/batches`), Files (`POST /v1/files`), Token Counting (`POST /v1/messages/count_tokens` — see `shared/token-counting.md`), and Models (`GET /v1/models`, `GET /v1/models/{id}` — live capability/context-window discovery) feed into or support Messages API requests.\n\n---\n\n## Current Models (cached: 2026-06-24)\n\n| Model             | Model ID            | Context        | Input $/1M | Output $/1M |\n| ----------------- | ------------------- | -------------- | ---------- | ----------- |\n| Claude Fable 5    | `claude-fable-5`      | 1M             | $10.00     | $50.00      |\n| Claude Mythos 5 (Project Glasswing only) | `claude-mythos-5` | 1M | $10.00     | $50.00      |\n| Claude Opus 4.8   | `claude-opus-4-8`   | 1M             | $5.00      | $25.00      |\n| Claude Opus 4.7   | `claude-opus-4-7`   | 1M             | $5.00      | $25.00      |\n| Claude Opus 4.6   | `claude-opus-4-6`   | 1M             | $5.00      | $25.00      |\n| Claude Sonnet 5   | `claude-sonnet-5`   | 1M             | $3.00 ($2.00 intro through 2026-08-31) | $15.00 ($10.00 intro) |\n| Claude Sonnet 4.6 | `claude-sonnet-4-6` | 1M             | $3.00      | $15.00      |\n| Claude Haiku 4.5  | `claude-haiku-4-5`  | 200K           | $1.00      | $5.00       |\n\n**ALWAYS use `claude-opus-4-8` unless the user explicitly names a different model.** This is non-negotiable. Do not use `claude-sonnet-5`, `claude-sonnet-4-6`, or any other model unless the user literally says \"use sonnet\" or \"use haiku\". Never downgrade for cost — that's the user's decision, not yours. Use `claude-fable-5` only when the user explicitly asks for Claude Fable 5, \"fable\", or Anthropic's most capable model — it has different API behavior than the Opus family (see below) and pricing that exceeds Opus-tier.\n\n### Claude Fable 5 (`claude-fable-5`) — most capable widely released model\n\nClaude Fable 5 is Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work. **Claude Mythos 5** (`claude-mythos-5`) offers the same capabilities, pricing, and API surface through Project Glasswing (participation is the only way to access it), succeeding the invitation-only Claude Mythos Preview (`claude-mythos-preview`) — everything below applies to both models. 1M context window (the maximum is also the default), 128K max output. Key API differences from Opus-tier — see `shared/model-migration.md` → Migrating to Claude Fable 5 for details:\n\n- **Thinking is always on** — omit the `thinking` parameter entirely (or send `{type: \"adaptive\"}`). Any other explicit configuration is rejected: `{type: \"disabled\"}` and `{type: \"enabled\", budget_tokens: N}` both return a 400. Control depth with `output_config.effort` (supports `low` through `xhigh` and `max`).\n- **The raw chain of thought is never returned** — responses carry regular `thinking` blocks (not `redacted_thinking`): `display: \"summarized\"` returns a readable summary, `\"omitted\"` (the default) leaves the `thinking` field as an empty string. Replay rules: pass thinking blocks back exactly as received on the same model (including empty-text blocks — the API rejects *modified* blocks, not read ones); a **different** model **drops** them from the prompt (typically silently — not an error; the drop happens before pricing, so dropped blocks aren't billed and there's nothing to strip). Regular thinking blocks from other models replay across models freely.\n- **Tokenizer** — same tokenizer as Opus 4.8 (introduced with Opus 4.7). Token counts are roughly unchanged when migrating from Opus 4.7/4.8; per-token pricing differs. Coming from Opus 4.6, Sonnet, Haiku, or older, re-baseline with `count_tokens`.\n- **`refusal` stop reason — handle it, and opt into fallbacks by default** — safety classifiers may decline a request (HTTP 200, `stop_reason: \"refusal\"`, with a `stop_details` category). A pre-output refusal has an empty `content` array and is not billed at all; a mid-stream refusal bills the already-streamed output — discard the partial output. Always check `stop_reason` before reading `content`. Recovery is **opt-in on the API**: most Claude consumer surfaces ship with built-in Claude Opus 4.8 fallbacks, but an API request that doesn't opt in simply stops on a refusal — and false positives on benign adjacent work (security tooling, life-sciences tasks) do happen. **When you write `claude-fable-5` code, include the server-side `fallbacks` parameter by default** (`betas: [\"server-side-fallback-2026-06-01\"]` + `fallbacks: [{\"model\": \"claude-opus-4-8\"}]`; Claude API and Claude Platform on AWS): a declined request is transparently re-served by the fallback model inside the same call, with credit-style repricing applied automatically (a decline before any output isn't billed; the rescue bills at the fallback model's own rates). Tell the user you've enabled it; drop it only if they decline. The GA SDKs' client-side `BetaRefusalFallbackMiddleware` + `BetaFallbackState` handle retry everywhere server-side fallbacks aren't supported (incl. Amazon Bedrock, Vertex AI, Microsoft Foundry); fallback credit refunds the cache-switch cost of client-side retries. Code examples: the Refusal Fallbacks section of your language's claude-api doc; full semantics in the migration guide's refusal section.\n- **No assistant prefill** — same as the rest of the 4.6+ family.\n- **30-day data retention required** — Claude Fable 5 is not available under zero data retention; requests from an org whose retention configuration doesn't meet the requirement return `400 invalid_request_error`.\n- **Longer turns, different prompting** — single requests on hard tasks can run many minutes (plan timeouts/streaming/progress UX); effort sweeps should include low/medium for routine work; prompts written for prior models are often too prescriptive and reduce output quality. See `shared/model-migration.md` → Migrating to Claude Fable 5 → Behavioral shifts (prompt-tunable) for the recommended prompt snippets (anti-overplanning, no-tidying, grounded progress claims, boundaries, async sub-agents, memory, `send_to_user`).\n\n**CRITICAL: Use only the exact model ID strings from the table above — they are complete as-is. Do not append date suffixes.** For example, use `claude-sonnet-4-6`, never `claude-sonnet-4-6-20251114` or any other date-suffixed variant you might recall from training data. If the user requests an older model not in the table (e.g., \"opus 4.5\", \"sonnet 3.7\"), read `shared/models.md` for the exact ID — do not construct one yourself.\n\nA note: if any of the model strings above look unfamiliar to you, that's to be expected — that just means they were released after your training data cutoff. Rest assured they are real models; we wouldn't mess with you like that.\n\n**Live capability lookup:** The table above is cached. When the user asks \"what's the context window for X\", \"does X support vision/thinking/effort\", or \"which models support Y\", query the Models API (`client.models.retrieve(id)` / `client.models.list()`) — see `shared/models.md` for the field reference and capability-filter examples.\n\n---\n\n## Authentication (Quick Reference)\n\n**An unset `ANTHROPIC_API_KEY` does NOT mean there are no credentials.** The SDKs and the `ant` CLI resolve credentials in this order (first match wins): `ANTHROPIC_API_KEY` → `ANTHROPIC_AUTH_TOKEN` → the `ANTHROPIC_PROFILE`-selected or active OAuth profile from `ant auth login` → Workload Identity Federation env vars → the default profile on disk. A bare `Anthropic()` / `new Anthropic()` / `anthropic.NewClient()` works after `ant auth login` with no env var set.\n\n**When you need to call the API and `ANTHROPIC_API_KEY` is unset, don't ask the user for a key.** First run `ant auth status` — it shows which credential source and profile is active. If it reports an active profile:\n\n- **SDK code or `ant` CLI:** just run it. The zero-arg client constructor and every `ant …` subcommand pick up the profile automatically — no env var needed.\n- **Raw `curl` / HTTP:** get a short-lived token with `ant auth print-credentials --access-token` and send it as `Authorization: Bearer <token>` **plus** the header `anthropic-beta: oauth-2025-04-20` (OAuth tokens go on `Authorization: Bearer`, not `x-api-key:` — converting a curl from an API key is a header change, not a key swap). Always pass `--access-token`; the no-flag form prints JSON, not a bare token.\n\nOnly ask the user for a key if `ant auth status` reports no active credential source (or `ant` itself isn't installed). Suggest `ant auth login` as the first option — it stores a profile under `~/.config/anthropic/` that the SDKs read automatically — and an exported `ANTHROPIC_API_KEY` as the alternative.\n\nFull auth details (named profiles, scopes, the API-key-shadows-profile trap, refresh-token expiry): `shared/anthropic-cli.md`.\n\n---\n\n## Thinking & Effort (Quick Reference)\n\n**Fable 5 / Opus 4.8 / 4.7 / Sonnet 5 — Adaptive thinking only:** Use `thinking: {type: \"adaptive\"}`. `thinking: {type: \"enabled\", budget_tokens: N}` returns a 400 — adaptive is the only on-mode. On Opus 4.8, Opus 4.7, and Sonnet 5, `{type: \"disabled\"}` and omitting `thinking` both work (on Sonnet 5, omitting runs adaptive; on Opus 4.7/4.8, omitting runs without thinking — set `{type: \"adaptive\"}` explicitly); on Fable 5, an explicit `{type: \"disabled\"}` returns a 400 — omit the `thinking` param entirely instead. Sampling parameters (`temperature`, `top_p`, `top_k`) are also removed and will 400. Opus 4.8 keeps the same request surface as 4.7 (no new breaking changes) — see `shared/model-migration.md` → Migrating to Opus 4.8 for the behavioral re-tuning, and → Migrating to Opus 4.7 for the full breaking-change list when coming from 4.6 or earlier. Note: with `thinking` disabled, Opus 4.8 may write longer reasoning into the visible response — leave adaptive thinking on, or add a final-answer-only instruction (see the migration guide).\n**Opus 4.6 — Adaptive thinking (recommended):** Use `thinking: {type: \"adaptive\"}`. Claude dynamically decides when and how much to think. No `budget_tokens` needed — `budget_tokens` is deprecated on Opus 4.6 and Sonnet 4.6 and should not be used for new code. Adaptive thinking also automatically enables interleaved thinking (no beta header needed). **When the user asks for \"extended thinking\", a \"thinking budget\", or `budget_tokens`: always use Fable 5, Opus 4.8, 4.7, or 4.6 with `thinking: {type: \"adaptive\"}`. The concept of a fixed token budget for thinking is deprecated — adaptive thinking replaces it. Do NOT use `budget_tokens` for new 4.6/4.7/4.8 code and do NOT switch to an older model.** *Gradual-migration carve-out:* `budget_tokens` is still functional on Opus 4.6 and Sonnet 4.6 as a transitional escape hatch — if you're migrating existing code and need a hard token ceiling before you've tuned `effort`, see `shared/model-migration.md` → Transitional escape hatch. Note: this carve-out does **not** apply to Fable 5, Opus 4.7 or 4.8 — `budget_tokens` is fully removed there.\n**Effort parameter (GA, no beta header):** Controls thinking depth and overall token spend via `output_config: {effort: \"low\"|\"medium\"|\"high\"|\"max\"}` (inside `output_config`, not top-level). Default is `high` (equivalent to omitting it). `max` is supported on Fable 5, Opus 4.6 and later, Sonnet 5, and Sonnet 4.6 (not Haiku or earlier Sonnets). Opus 4.7 added `\"xhigh\"` (between `high` and `max`) — the best setting for most coding and agentic use cases on Fable 5 / Opus 4.7/4.8 / Sonnet 5, and the default in Claude Code; use a minimum of `high` for most intelligence-sensitive work. Works on Fable 5, Opus 4.5, Opus 4.6, Opus 4.7, Opus 4.8, Sonnet 5, and Sonnet 4.6. Will error on Sonnet 4.5 / Haiku 4.5. On Fable 5, Opus 4.7/4.8, and Sonnet 5, effort matters more than on any prior model in their tier — re-tune it when migrating, and run long-horizon/agentic tasks at `high`/`xhigh` with the full task spec given up front. Combine with adaptive thinking for the best cost-quality tradeoffs. Lower effort means fewer and more-consolidated tool calls, less preamble, and terser confirmations — `high` is often the sweet spot balancing quality and token efficiency; use `max` when correctness matters more than cost; use `low` for subagents or simple tasks.\n\n**Thinking display — `\"omitted\"` by default on Fable 5 / Mythos 5 / Opus 4.8 / 4.7 / Sonnet 5:** `display: \"summarized\"` returns a readable summary of the reasoning; `\"omitted\"` (the default on all five — a silent change from Opus 4.6 and Sonnet 4.6, where it was `\"summarized\"`) streams `thinking` blocks with empty text. `display` controls visibility only — thinking happens and is billed the same under every setting; the raw chain of thought is never exposed on any model. If you stream reasoning to users, the default looks like a long pause before output — set `thinking: {type: \"adaptive\", display: \"summarized\"}` explicitly. (Independent of display, echo thinking blocks back unchanged when continuing on the same model; other models silently ignore them — see the migration guide.)\n\n**Task Budgets (beta, Fable 5 / Opus 4.7 / 4.8 / Sonnet 5):** `output_config: {task_budget: {type: \"tokens\", total: N}}` tells the model how many tokens it has for a full agentic loop — it sees a running countdown and self-moderates (minimum 20,000; beta header `task-budgets-2026-03-13`). Distinct from `max_tokens`, which is an enforced per-response ceiling the model is not aware of. See `shared/model-migration.md` → Task Budgets.\n\n**Sonnet 4.6:** Supports adaptive thinking (`thinking: {type: \"adaptive\"}`). `budget_tokens` is deprecated on Sonnet 4.6 — use adaptive thinking instead.\n\n**Older models (only if explicitly requested):** If the user specifically asks for Sonnet 4.5 or another older model, use `thinking: {type: \"enabled\", budget_tokens: N}`. `budget_tokens` must be less than `max_tokens` (minimum 1024). Never choose an older model just because the user mentions `budget_tokens` — use Opus 4.8 with adaptive thinking instead.\n\n---\n\n## Compaction (Quick Reference)\n\n**Beta, Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, Sonnet 5, and Sonnet 4.6.** For long-running conversations that may exceed the 1M context window, enable server-side compaction. The API automatically summarizes earlier context when it approaches the trigger threshold (default: 150K tokens). Requires beta header `compact-2026-01-12`.\n\n**Critical:** Append `response.content` (not just the text) back to your messages on every turn. Compaction blocks in the response must be preserved — the API uses them to replace the compacted history on the next request. Extracting only the text string and appending that will silently lose the compaction state.\n\nSee `{lang}/claude-api/README.md` (Compaction section) for code examples. Full docs via WebFetch in `shared/live-sources.md`.\n\n---\n\n## Prompt Caching (Quick Reference)\n\n**Prefix match.** Any byte change anywhere in the prefix invalidates everything after it. Render order is `tools` → `system` → `messages`. Keep stable content first (frozen system prompt, deterministic tool list), put volatile content (timestamps, per-request IDs, varying questions) after the last `cache_control` breakpoint.\n\n**Mid-conversation operator instructions** (Claude Opus 4.8 only; no beta header): append `{\"role\": \"system\", ...}` to `messages[]` instead of editing top-level `system`. Preserves the cached history prefix and is the prompt-injection-safe operator channel. See `shared/prompt-caching.md` § Mid-conversation system messages.\n\n**Top-level auto-caching** (`cache_control: {type: \"ephemeral\"}` on `messages.create()`) is the simplest option when you don't need fine-grained placement. Max 4 breakpoints per request. Minimum cacheable prefix is ~1024 tokens — shorter prefixes silently won't cache.\n\n**Verify with `usage.cache_read_input_tokens`** — if it's zero across repeated requests, a silent invalidator is at work (`datetime.now()` in system prompt, unsorted JSON, varying tool set).\n\nFor placement patterns, architectural guidance, and the silent-invalidator audit checklist: read `shared/prompt-caching.md`. Language-specific syntax: `{lang}/claude-api/README.md` (Prompt Caching section).\n\n---\n\n## Fast Mode (Quick Reference)\n\n**Research preview, Opus 4.8 / 4.7 only.** Opus 4.7 fast mode is deprecated — after removal, `speed: \"fast\"` on 4.7 returns an error. Opus 4.8 is the durable fast-capable tier. Fast mode runs the same model at up to 2.5x higher output tokens per second, at premium pricing. Three things are required on every request: use the **beta** messages endpoint (`client.beta.messages.…`), pass the beta flag `fast-mode-2026-02-01`, and set `speed: \"fast\"` as a top-level request parameter (not a header, not in `extra_body`).\n\n```python\nclient.beta.messages.create(\n    model=\"claude-opus-4-8\", max_tokens=4096,\n    speed=\"fast\", betas=[\"fast-mode-2026-02-01\"],\n    messages=[...],\n)\n```\n\n| Language | Beta flag | Speed parameter |\n|---|---|---|\n| Python | `betas=[\"fast-mode-2026-02-01\"]` | `speed=\"fast\"` |\n| TypeScript / Ruby | `betas: [\"fast-mode-2026-02-01\"]` | `speed: \"fast\"` |\n| Go | `[]anthropic.AnthropicBeta{anthropic.AnthropicBetaFastMode2026_02_01}` | `Speed: anthropic.BetaMessageNewParamsSpeedFast` |\n| Java | `.addBeta(AnthropicBeta.FAST_MODE_2026_02_01)` | `.speed(MessageCreateParams.Speed.FAST)` |\n| C# | `Betas = [\"fast-mode-2026-02-01\"]` | `Speed = Speed.Fast` (`Anthropic.Models.Beta.Messages`) |\n| PHP | `betas: ['fast-mode-2026-02-01']` | `speed: 'fast'` |\n| cURL | `anthropic-beta: fast-mode-2026-02-01` header | `\"speed\": \"fast\"` in body |\n\n`response.usage.speed` reports which speed was used. Fast mode has its own rate limit separate from standard Opus; on 429, either retry after the `retry-after` delay or drop `speed` and fall back to standard (note: switching speed invalidates prompt cache). Not available with Batch API, Priority Tier, Claude Platform on AWS, or third-party platforms.\n\n---\n\n## Task Budgets (Quick Reference)\n\n**Beta, Fable 5 / Sonnet 5 / Opus 4.8 / 4.7.** A task budget gives Claude a token ceiling for an agentic loop so it paces itself and finishes gracefully instead of being cut off. Set `task_budget` inside `output_config` on `client.beta.messages.stream(...)` with beta flag `task-budgets-2026-03-13` — use streaming so the large `max_tokens` doesn't hit HTTP timeouts:\n\n```python\nwith client.beta.messages.stream(\n    model=\"claude-opus-4-8\", max_tokens=128000,\n    output_config={\"effort\": \"high\", \"task_budget\": {\"type\": \"tokens\", \"total\": 64000}},\n    betas=[\"task-budgets-2026-03-13\"],\n    messages=[...], tools=[...],\n) as stream:\n    response = stream.get_final_message()\n```\n\n`task_budget` fields: `type` (always `\"tokens\"`), `total`, and optional `remaining` (defaults to `total`). The server injects a countdown marker Claude sees during generation; the budget counts what Claude generates and the tool results it reads this turn — **not** the full history you resend each request.\n\n**Observing spend:** accumulate `response.usage.output_tokens` (plus the token count of the tool-result blocks you append) across loop iterations if you want to display progress. Leave `remaining` unset in the normal loop — the server tracks the countdown itself, and passing a client-computed `remaining` while also resending full history under-reports the budget. **Only pass `remaining`** when you compact or rewrite history between requests and the server can no longer derive prior spend.\n\n---\n\n## Provider Clients (Quick Reference)\n\nWhen targeting Claude on a third-party platform, use that platform's dedicated client class — not the first-party `Anthropic()` client with a `base_url` override. After construction the client exposes the same `messages.create` / `.stream` surface as the first-party SDK.\n\n### Amazon Bedrock\n\nUse the **Mantle** client (Messages-API Bedrock endpoint). Bedrock model IDs take an `anthropic.` prefix (e.g. `\"anthropic.claude-opus-4-8\"`). Region is required.\n\n| Language | Client |\n|---|---|\n| Python | `from anthropic import AnthropicBedrockMantle` → `AnthropicBedrockMantle(aws_region=\"…\")` |\n| TypeScript | `import { AnthropicBedrockMantle } from \"@anthropic-ai/bedrock-sdk\"` → `new AnthropicBedrockMantle({ awsRegion: \"…\" })` |\n| Go | `bedrock.NewMantleClient(ctx, bedrock.MantleClientConfig{ AWSRegion: \"…\" })` |\n| Java | `AnthropicOkHttpClient.builder().backend(BedrockMantleBackend.fromEnv()).build()` (from `com.anthropic.bedrock.backends`) |\n| C# | `new AnthropicBedrockMantleClient(new() { AwsRegion = \"…\" })` (package `Anthropic.Bedrock`) |\n| PHP | `use Anthropic\\Bedrock\\MantleClient;` → `new MantleClient(awsRegion: '…')` |\n| Ruby | `Anthropic::BedrockMantleClient.new(aws_region: \"…\")` |\n\n`AnthropicBedrock` / `BedrockClient` / `BedrockBackend` (without `Mantle`) are the legacy `bedrock-runtime` InvokeModel path — prefer the Mantle client for new code.\n\n### Microsoft Foundry\n\n| Language | Client |\n|---|---|\n| Python | `from anthropic import AnthropicFoundry` → `AnthropicFoundry(api_key=…, resource=\"…\")` |\n| TypeScript | `import AnthropicFoundry from \"@anthropic-ai/foundry-sdk\"` → `new AnthropicFoundry({ … })` |\n| Java | `AnthropicOkHttpClient.builder().backend(FoundryBackend.fromEnv()).build()` (from `com.anthropic.foundry.backends`) |\n| C# | `new AnthropicFoundryClient(new AnthropicFoundryApiKeyCredentials(…))` (package `Anthropic.Foundry`) |\n| PHP | `Foundry\\Client::withCredentials(…)` |\n\nThe Go and Ruby SDKs do not currently support Foundry. For Ruby, use the standard `Anthropic::Client.new(base_url: \"<foundry endpoint>\")` as a fallback (Entra ID auth is not built in). For Claude Platform on AWS, see `shared/claude-platform-on-aws.md`.\n\n### Google Cloud Vertex AI\n\nTwo required constructor args: GCP `project_id` and `region`. Vertex model IDs take **no prefix** — current-generation models (Opus 4.8/4.7/4.6, Sonnet 5, Sonnet 4.6) use the bare first-party ID (e.g. `\"claude-opus-4-8\"`); dated-snapshot models use an `@` version separator (e.g. `claude-opus-4-5@20251101`, **not** `claude-opus-4-5-20251101`). Auth is GCP ADC (`gcloud auth application-default login`); no Anthropic API key. `region` can be `\"global\"` (recommended), a multi-region (`\"us\"`/`\"eu\"`), or a specific region. After construction, use the same `messages.create` / `.stream` surface.\n\n| Language | Client |\n|---|---|\n| Python | `from anthropic import AnthropicVertex` → `AnthropicVertex(project_id=\"…\", region=\"…\")` (install `\"anthropic[vertex]\"`) |\n| TypeScript | `import { AnthropicVertex } from \"@anthropic-ai/vertex-sdk\"` → `new AnthropicVertex({ projectId, region })` |\n| Go | `import \"github.com/anthropics/anthropic-sdk-go/vertex\"` → `anthropic.NewClient(vertex.WithGoogleAuth(ctx, region, projectID))` |\n| Java | `AnthropicOkHttpClient.builder().backend(VertexBackend.builder().region(\"…\").project(\"…\").build()).build()` (from `com.anthropic.vertex.backends`) |\n| C# | `new AnthropicClient { Backend = new VertexBackend(projectId, region) }` (package `Anthropic.Vertex`) |\n| PHP | `use Anthropic\\Vertex;` → `Vertex\\Client::fromEnvironment(location: '…', projectId: '…')` — note `location`, not `region` |\n| Ruby | `Anthropic::VertexClient.new(region: \"…\", project_id: \"…\")` |\n\n---\n\n## Context Editing (Quick Reference)\n\n**Beta.** Context editing **clears** old tool results or thinking blocks from the conversation before the model sees it; it is **not compaction** (which summarizes). On `client.beta.messages.*` with beta `context-management-2025-06-27`, pass `context_management.edits` with a strategy type:\n\n```python\nclient.beta.messages.create(\n    model=\"claude-opus-4-8\", max_tokens=4096,\n    betas=[\"context-management-2025-06-27\"],\n    context_management={\"edits\": [{\"type\": \"clear_tool_uses_20250919\"}]},\n    tools=[...], messages=[...],\n)\n```\n\nStrategy types: `clear_tool_uses_20250919` (clears old tool results; optional `clear_tool_inputs: true` also clears the tool_use params) and `clear_thinking_20251015` (clears thinking blocks). Do **not** use `compact_20260112` or beta `compact-2026-01-12` — those are the separate compaction feature.\n\n---\n\n## Mid-Conversation System Messages (Quick Reference)\n\n**Claude Opus 4.8 only; no beta header.** Append `{\"role\": \"system\", \"content\": \"…\"}` to the `messages` array (not the top-level `system` field) to add an operator instruction mid-conversation without invalidating the cached prefix. Use the regular `client.messages.create` — there is no beta. A mid-conversation system message must follow a `user` message (or an `assistant` message ending in server-tool use), and must be either the last entry in `messages` or be followed by an `assistant` turn — it cannot be `messages[0]`. Availability: `shared/platform-availability.md`. See `shared/prompt-caching.md` § Mid-conversation system messages.\n\n---\n\n## Managed Agents (Beta)\n\n**Managed Agents** is a third surface: server-managed stateful agents with Anthropic-hosted tool execution. You create a persisted, versioned Agent config (`POST /v1/agents`), then start Sessions that reference it. Each session provisions a container as the agent's workspace — bash, file ops, and code execution run there; the agent loop itself runs on Anthropic's orchestration layer and acts on the container via tools. The session streams events; you send messages and tool results back.\n\nAvailability: `shared/platform-availability.md`. For agents on Bedrock / Vertex / Foundry (where Managed Agents is unsupported), use Claude API + tool use.\n\n**Mandatory flow:** Agent (once) → Session (every run). `model`/`system`/`tools` live on the agent, never the session. See `shared/managed-agents-overview.md` for the full reading guide, beta headers, and pitfalls.\n\n**Beta headers:** `managed-agents-2026-04-01` — the SDK sets this automatically for all `client.beta.{agents,environments,sessions,vaults,memory_stores,deployments,deployment_runs}.*` calls. Skills API uses `skills-2025-10-02` and Files API uses `files-api-2025-04-14`, but you don't need to explicitly pass those in for endpoints other than `/v1/skills` and `/v1/files`.\n\n**Subcommands** — invoke directly with `/claude-api <subcommand>`:\n\n| Subcommand | Action |\n|---|---|\n| `managed-agents-onboard` | Walk the user through setting up a Managed Agent from scratch. **Read `shared/managed-agents-onboarding.md` immediately** and follow its interview script: **describe → configure the agent (propose, don't interrogate) → environment → session** (same arc as the Console quickstart, auth deferred to the session step) — defaults and inline suggestions do the work, with a silent viability gate (job vs tools/credentials/data) before any code is emitted. Do not summarize — run the interview. |\n\n**Reading guide:** Start with `shared/managed-agents-overview.md`, then the topical `shared/managed-agents-*.md` files (core, environments, tools, events, outcomes, multiagent, webhooks, memory, scheduled-deployments, client-patterns, onboarding, api-reference). For Python, TypeScript, Go, Ruby, PHP, and Java, read `{lang}/managed-agents/README.md` for code examples. For cURL, read `curl/managed-agents.md`. **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `agents.create` and pass it to every subsequent `sessions.create`; do not call `agents.create` in the request path. The Anthropic CLI (`ant`) is one convenient way to create agents and environments from version-controlled YAML — see `shared/anthropic-cli.md`. If a binding you need isn't shown in the language README, WebFetch the relevant entry from `shared/live-sources.md` rather than guess. C# has beta Managed Agents support via `client.Beta.Agents` and related namespaces.\n\n**When the user wants to set up a Managed Agent from scratch** (e.g. \"how do I get started\", \"walk me through creating one\", \"set up a new agent\"): read `shared/managed-agents-onboarding.md` and run its interview — same flow as the `managed-agents-onboard` subcommand.\n\n**When the user asks \"how do I write the client code for X\":** reach for `shared/managed-agents-client-patterns.md` — covers lossless stream reconnect, `processed_at` queued/processed gate, interrupt, `tool_confirmation` round-trip, the correct idle/terminated break gate, post-idle status race, stream-first ordering, file-mount gotchas, keeping credentials host-side via custom tools, etc.\n\n**When the user wants the agent to run on a schedule** (cron, \"every night\", \"weekly report\"): read `shared/managed-agents-scheduled-deployments.md` — deployments fire sessions autonomously on a cron cadence, with per-firing run records and lifecycle controls (pause/unpause/archive).\n\n---\n\n## Server Tools (Quick Reference)\n\nServer-side tools run on Anthropic's infrastructure — no client-side execution loop. Declare in `tools`; results arrive as content blocks in the same response. **No beta header** unless noted. **Prefer the latest type variant your model supports.** The `_20260209` web search / web fetch variants below (dynamic filtering) require Opus 4.8/4.7/4.6, Sonnet 5, or Sonnet 4.6; the basic variants for older models are listed after the table.\n\n| Tool | `type` | `name` | Key optional params | Result block type |\n|---|---|---|---|---|\n| Web search | `web_search_20260209` | `web_search` | `max_uses`, `allowed_domains`/`blocked_domains`, `user_location` | `web_search_tool_result` → `.content` is a list of `web_search_result` |\n| Web fetch | `web_fetch_20260209` | `web_fetch` | `max_uses`, `allowed_domains`/`blocked_domains`, `citations`, `max_content_tokens` | `web_fetch_tool_result` → `.content` is a `web_fetch_result` with a `document` block |\n| Code execution | `code_execution_20260521` | `code_execution` | none | `bash_code_execution_tool_result` → `.content.stdout` / `.stderr` / `.return_code` |\n| Tool search (regex) | `tool_search_tool_regex_20251119` | `tool_search_tool_regex` | mark other tools `defer_loading: true` | `tool_search_tool_result` |\n| Tool search (BM25) | `tool_search_tool_bm25_20251119` | `tool_search_tool_bm25` | mark other tools `defer_loading: true` | `tool_search_tool_result` |\n\n`web_search_20260209` / `web_fetch_20260209` have built-in dynamic filtering — code execution runs under the hood, so do **not** separately declare `code_execution` in `tools` (a second execution environment confuses the model). For models older than Opus 4.6 / Sonnet 4.6, use the basic variants `web_search_20250305` / `web_fetch_20250910` instead; on Vertex AI only basic `web_search_20250305` is available. `code_execution_20260120` (REPL persistence + programmatic tool calling) runs on Opus 4.5+ / Sonnet 4.5+. **Go SDK only**: `code_execution_20260521` lives under `client.Beta.Messages.New` with `Betas: []anthropic.AnthropicBeta{\"code-execution-2025-08-25\"}` (other languages use plain `client.messages.create`); `code_execution_20260120` uses the non-beta `client.Messages.New` in Go like everywhere else. Web fetch only fetches URLs already present in the conversation. Provider availability varies by tool — see `shared/platform-availability.md`. See `shared/tool-use-concepts.md` for `pause_turn` handling.\n\n## Document & File Input (Quick Reference)\n\n**PDF (base64, no beta):** `{\"type\": \"document\", \"source\": {\"type\": \"base64\", \"media_type\": \"application/pdf\", \"data\": <b64 string>}}` in user content, placed before the text block. Base64 string must have no newlines. Limits: 32 MB request, 600 pages (100 for 200k-context models). Java: `ContentBlockParam.ofDocument(DocumentBlockParam... Base64PdfSource.builder().data(...))`.\n\n**Files API (beta `files-api-2025-04-14`):** upload via `client.beta.files.upload(...)` → response `id` is the `file_id`. Reference it as `{\"type\": \"document\", \"source\": {\"type\": \"file\", \"file_id\": \"...\"}}` for PDF/text, or `{\"type\": \"image\", ...}` for images — the content-block type must match the file's MIME type. The beta header is required on **both** the upload and the `messages.create` that references the file. Availability: `shared/platform-availability.md`.\n\n**Citations (no beta):** set `citations: {enabled: true}` on each `document` content block (all or none). Response splits into multiple `text` blocks; cited blocks carry a `citations` array. Each citation has `cited_text`, `document_index`, `document_title`, and a location by `type`: `char_location` (`start_char_index`/`end_char_index`) for plain text, `page_location` (`start_page_number`/`end_page_number`, 1-indexed) for PDF, `content_block_location` for custom content. Incompatible with `output_config.format`.\n\n## Tool Use Patterns (Quick Reference)\n\n**Strict tool use (no beta):** set `strict: true` as a top-level field on the tool definition (alongside `name`/`description`/`input_schema`), **not** on `tool_choice`. Schema must have `additionalProperties: false` + `required`. Guarantees `tool_use.input` validates exactly. Go: `Strict: anthropic.Bool(true)` + `additionalProperties` via `InputSchema.ExtraFields`; Java: `.strict(true)` + `.putAdditionalProperty(\"additionalProperties\", JsonValue.from(false))`.\n\n**Parallel tool use (default on):** one assistant message may contain multiple `tool_use` blocks. Execute them concurrently, then return **all** `tool_result` blocks in a **single** user message (don't split across multiple messages). For a failed tool, return `tool_result` with `is_error: true` — don't drop it.\n\n**Tool Runner (SDK beta helper):** drives the tool-call loop for you via `client.beta.messages.*`. Python: `@beta_tool` decorator + `client.beta.messages.tool_runner(...)` → `runner.until_done()`. TypeScript: `betaZodTool({...})` from `@anthropic-ai/sdk/helpers/beta/zod` + `client.beta.messages.toolRunner(...)` → `await runner`. Go: `toolrunner.NewBetaToolFromJSONSchema(...)` + `client.Beta.Messages.NewToolRunner(...)` → `.RunToCompletion(ctx)`. Java requires `.addBeta(\"structured-outputs-2025-11-13\")`. Ruby: `Anthropic::BaseTool` subclass + `client.beta.messages.tool_runner(...)`. PHP: `BetaRunnableTool` + `->toolRunner(...)`. C#: raw JSON-schema tools + `BetaToolRunner` via `client.Beta.Messages.ToolRunner(...)`.\n\n**Programmatic tool calling (no beta header):** Claude calls your custom tool from inside code execution. Add `{\"type\": \"code_execution_20260120\", \"name\": \"code_execution\"}` **and** set `\"allowed_callers\": [\"code_execution_20260120\"]` on your custom tool. Opus 4.5+ / Sonnet 4.5+ (availability: `shared/platform-availability.md`). When responding to a pending programmatic call, the user message must contain **only** `tool_result` blocks (no text). Not compatible with `strict: true`, `disable_parallel_tool_use`, forced `tool_choice`, or MCP tools.\n\n## Other API Surfaces (Quick Reference)\n\n**Message Batches (no beta; availability: `shared/platform-availability.md`):** `client.messages.batches.create(requests=[{custom_id, params}, ...])` → poll `client.messages.batches.retrieve(id).processing_status` until `\"ended\"` → stream `client.messages.batches.results(id)`. Each result has `.custom_id` + `.result.type` (`succeeded`/`errored`/`canceled`/`expired`); on success read `.result.message.content`. Python wraps requests as `Request(custom_id=..., params=MessageCreateParamsNonStreaming(...))`. Results arrive in **any order** — key by `custom_id`, never by position.\n\n**Models API (no beta; availability: `shared/platform-availability.md`):** `client.models.list()` (auto-paginates) and `client.models.retrieve(\"claude-opus-4-8\")`. Each model object has `id`, `display_name`, `created_at`, and — since Mar 2026 — `max_input_tokens` (the context window), `max_tokens` (the output cap), and `capabilities`. There is no `context_window` field.\n\n**Stop details (GA, Opus 4.7+):** `response.stop_details` is populated **only when `stop_reason == \"refusal\"`** (fields: `type: \"refusal\"`, `category: \"cyber\"|\"bio\"|null`, `explanation`). It is `null` for every other `stop_reason` (`end_turn`, `max_tokens`, `tool_use`, `pause_turn`, …) — always guard before reading.\n\n**Client config (no beta):** `timeout` default 10 min; **units differ by SDK** — Python/Ruby: seconds; TypeScript: **milliseconds**; Go `option.WithRequestTimeout(time.Duration)`; Java `Duration`; C# `TimeSpan`. TS scales the default up to 60 min for large `max_tokens` on non-streaming requests; Java does so for streaming requests (Java non-streaming scales 30s–10 min). `max_retries`/`maxRetries` default 2 (retries 408/409/429/5xx + connection errors). `base_url` (or `ANTHROPIC_BASE_URL` env). Per-request override: Python `client.with_options(timeout=5.0).messages.create(...)`; TS `client.messages.create({...}, {timeout: 5_000})`; Ruby `request_options: {timeout: 5}`. Timeouts are retried — wall-clock can reach `timeout × (max_retries+1)`.\n\n## Workload Identity Federation (Quick Reference)\n\n**GA, no beta header.** Construct the normal zero-arg client (`Anthropic()` / `new Anthropic()` / `anthropic.NewClient()` / `AnthropicOkHttpClient.fromEnv()`); the SDK auto-detects WIF when **all** of `ANTHROPIC_FEDERATION_RULE_ID`, `ANTHROPIC_ORGANIZATION_ID`, `ANTHROPIC_SERVICE_ACCOUNT_ID`, and `ANTHROPIC_IDENTITY_TOKEN_FILE` (or `ANTHROPIC_IDENTITY_TOKEN`) are set, exchanges the JWT at `/v1/oauth/token`, and auto-refreshes. `ANTHROPIC_WORKSPACE_ID` does not gate activation — required only when the federation rule spans multiple workspaces (else 400 `workspace_id_required`), optional for single-workspace rules. `ANTHROPIC_API_KEY` or `ANTHROPIC_AUTH_TOKEN` (even empty) outrank WIF, and a set `ANTHROPIC_PROFILE` also wins over the federation env vars (a missing named profile is an error, not a fall-through) — unset all three.\n\n---\n\n## Reference Documentation\n\nThe relevant documentation for your detected language is included below in `<doc>` tags. Each tag has a `path` attribute showing its original file path. Use this to find the right section:\n\n### Quick Task Reference\n\n> All SDK languages use the same per-language `claude-api/` directory layout (cURL: `curl/examples.md`). Not every language has every file — if a file is absent, that feature's example is not yet documented for that language; fall back to the cURL shape or WebFetch the SDK repo.\n\n**Single text classification/summarization/extraction/Q&A:**\n→ Refer to `unknown/claude-api/README.md`\n\n**Chat UI or real-time response display:**\n→ Refer to `unknown/claude-api/README.md` + `unknown/claude-api/streaming.md`\n\n**Long-running conversations (may exceed context window):**\n→ Refer to `unknown/claude-api/README.md` — see Compaction section\n\n**Migrating to a newer model or replacing a retired model:**\n→ Refer to `shared/model-migration.md`\n\n**Prompt caching / optimize caching / \"why is my cache hit rate low\":**\n→ Refer to `shared/prompt-caching.md` + `unknown/claude-api/README.md` (Prompt Caching section)\n\n**Count tokens in a file / prompt / diff (\"how many tokens is X\"):**\n→ Refer to `shared/token-counting.md` — use `messages.count_tokens`, never `tiktoken`\n\n**Function calling / tool use / agents:**\n→ Refer to `unknown/claude-api/README.md` + `shared/tool-use-concepts.md` + `unknown/claude-api/tool-use.md`\n\n**Batch processing (non-latency-sensitive):**\n→ Refer to `unknown/claude-api/README.md` + `unknown/claude-api/batches.md`\n\n**File uploads across multiple requests:**\n→ Refer to `unknown/claude-api/README.md` + `unknown/claude-api/files-api.md`\n\n**Agent design (tool surface, context management, caching strategy):**\n→ Refer to `shared/agent-design.md`\n\n**Anthropic CLI (`ant`) — terminal access, version-controlled agent/environment YAML, scripting:**\n→ Refer to `shared/anthropic-cli.md`\n\n**Managed Agents (server-managed stateful agents):**\n→ Refer to `shared/managed-agents-overview.md` and the rest of the `shared/managed-agents-*.md` files. For Python, TypeScript, Go, Ruby, PHP, and Java, read the `managed-agents/README.md` in the language folder for code examples. For cURL, read `curl/managed-agents.md`. C# has beta Managed Agents support — use `curl/managed-agents.md` as the wire-level reference (the C# SDK mirrors it via `client.Beta.Agents`; see `csharp/claude-api/README.md`).\n\n**Error handling:**\n→ Refer to `shared/error-codes.md`\n\n**Latest docs via WebFetch:**\n→ Refer to `shared/live-sources.md` for URLs\n\nNo project language was auto-detected. Ask the user which language they are using, then refer to the matching docs below.\n\n---\n\n## Included Documentation\n\n<doc path=\"csharp/claude-api/README.md\">\n# Claude API — C#\n\n> **Note:** The C# SDK is the official Anthropic SDK for C#. Tool use is supported via the Messages API with a beta `BetaToolRunner` for automatic tool execution loops. The SDK also supports Microsoft.Extensions.AI IChatClient integration with function invocation and Managed Agents (beta).\n\n## Namespace Reference\n\nTypes are organized by namespace. If a type you need isn't shown in an example below, locate it via this table first — don't block on fetching SDK source over the network.\n\n| `using` | Contains |\n|---|---|\n| `Anthropic` | `AnthropicClient`, top-level options |\n| `Anthropic.Models.Messages` | non-beta request/response types — `MessageCreateParams`, `Model`, `Role`, `ContentBlock`, `TextBlock`, `ToolUseBlock`, `ToolResultBlockParam`, `Tool*` (tool definition classes) |\n| `Anthropic.Models.Beta.Messages` | beta-endpoint equivalents — `MessageCreateParams`, `BetaMessage`, `BetaTool*`, `Speed`, `BetaRequestMcpServerUrlDefinition`, context-editing/compaction configs |\n| `Anthropic.Models.Beta` | shared beta constants |\n| `Anthropic.Models.Beta.Files` | Files API types |\n| `Anthropic.Models.Messages.Batches` | Batch API types |\n| `Anthropic.Helpers.Beta` | `BetaToolRunner`, beta helper utilities |\n| `Anthropic.Exceptions` | `AnthropicApiException`, `AnthropicRateLimitException`, `Anthropic5xxException`, etc. — see `shared/error-codes.md` |\n| `Anthropic.Bedrock` / `Anthropic.Vertex` / `Anthropic.Foundry` / `Anthropic.Aws` | platform clients (separate NuGet packages): `AnthropicBedrockMantleClient`, `AnthropicFoundryClient`, `AnthropicAwsClient` |\n\n`client.Messages.*` uses non-beta types; `client.Beta.Messages.*` uses the `Anthropic.Models.Beta.Messages` types. Both namespaces define a `MessageCreateParams` — pick the one matching the client path you call.\n\n### Key types per feature\n\nWrite from this table instead of reflecting the SDK assembly. Endpoint column tells you whether to use `client.Messages.*` or `client.Beta.Messages.*`.\n\n| Feature | Endpoint | Key C# types (namespace per table above) |\n|---|---|---|\n| User profiles | beta | `client.Beta.UserProfiles.Create(...)` / `.Retrieve(id)` / `.List()`. Pass the returned profile id on the beta messages call. Requires a beta header — check the SDK's beta-headers reference for the current flag. |\n| Agent Skills | beta | `BetaContainerParams` (with `Skills = [new BetaSkillParams { ... }]`), `BetaCodeExecutionTool20250825`. `Betas = [\"code-execution-2025-08-25\", \"skills-2025-10-02\"]`. Download the output via `client.Beta.Files.Download(fileId)`. |\n| Advisor tool | beta | `BetaAdvisorTool20260301` — may not be in all SDK releases yet |\n| Cache diagnostics | beta | `Diagnostics = new() { PreviousMessageID = … }`, `BetaCacheControlEphemeral`, `BetaContentBlockParam` |\n| Context editing | beta | `ContextManagement = new BetaContextManagementConfig { Edits = [new BetaClearToolUses20250919Edit()] }`. `Betas = [\"context-management-2025-06-27\"]` (not `compact-2026-01-12` — that's for `BetaCompact20260112Edit`). |\n| Memory tool | non-beta | `Tools = [new ToolUnion(new MemoryTool20250818())]` |\n| Programmatic tool calling | non-beta | `CodeExecutionTool20260120`, `ToolResultBlockParam`, `ContentBlockParam` |\n| Task budgets | beta | `BetaOutputConfig` with `TaskBudget = new BetaTokenTaskBudget { ... }` |\n| Tool search | non-beta | `new ToolUnion(new ToolSearchToolRegex20251119 { Type = ToolSearchToolRegex20251119Type.ToolSearchToolRegex20251119 })` — `Type` must be set explicitly. |\n| Web search | non-beta | `new ToolUnion(new WebSearchTool20260209())` — the latest variant with dynamic filtering (Opus 4.8/4.7/4.6 + Sonnet 4.6). For older models or Vertex, use `WebSearchTool20250305()` |\n\n### Discovering type and member names\n\nIf a type or member you need isn't in the tables above, `strings ~/.nuget/packages/anthropic/*/lib/*/Anthropic.dll | grep -i <term>` is fast and sufficient for locating class and property names. **Do not escalate to a `dotnet run` reflection probe** to dump members precisely — the first compile is slow enough to be backgrounded in many environments, trapping you in a polling loop. Instead, write `Program.cs` using the names `strings | grep` found; if a member name is wrong the compiler error (`error CS1061: 'X' does not contain a definition for 'Y'`) points at it in a few seconds, faster than any reflection probe.\n\nNote that `strings` will not surface wire-format snake_case field names (`output_tokens`, `stop_reason`) — those are stored in the DLL differently. **C# properties are the PascalCase equivalent of the wire field** (`response.Usage.OutputTokens`, `response.StopReason`). If you know the wire field name from the docs, write the PascalCase property and compile; do not probe for the snake_case string.\n\n### Minimal working skeleton\n\n**Write a plain `Program.cs` body** — `using` statements followed by top-level statements, as below. Do **not** add a `#!/usr/bin/env dotnet` shebang or `#:package Anthropic@*` directive: those are .NET file-based-app syntax and fail with `CS1024: Preprocessor directive expected` when the file is compiled via an existing `.csproj`. The standard project setup (per the [C# quickstart](https://docs.claude.com/en/docs/get-started): `dotnet new console` → `dotnet add package Anthropic` → edit `Program.cs` → `dotnet run`) provides the `.csproj` and package reference.\n\nStart from this — it compiles as-is. Fill in the feature-specific fields; do not spend turns running reflection or XML-doc inspection to discover type names first.\n\n```csharp\nusing System;\nusing Anthropic;\nusing Anthropic.Models.Messages;       // or Anthropic.Models.Beta.Messages for beta endpoints\n\nAnthropicClient client = new();\n\nvar message = await client.Messages.Create(new MessageCreateParams\n{\n    Model = Model.ClaudeOpus4_8,\n    MaxTokens = 1024,\n    Messages = [ new() { Role = Role.User, Content = \"Hello, Claude\" } ],\n});\n\nConsole.WriteLine(message);\n```\n\nFor beta features (anything behind an `anthropic-beta` header), use the beta client path and namespace — same overall shape:\n\n```csharp\nusing System;\nusing Anthropic;\nusing Anthropic.Models.Beta.Messages;\n\nAnthropicClient client = new();\n\nvar response = await client.Beta.Messages.Create(new MessageCreateParams\n{\n    Model = \"claude-opus-4-8\",\n    MaxTokens = 4096,\n    Betas = [\"<beta-flag>\"],\n    Messages = [ new() { Role = Role.User, Content = \"…\" } ],\n    // Tools = new BetaToolUnion[] { new BetaSomeTool { … } },   // for tool features\n});\n\nConsole.WriteLine(response);\n```\n\nIf a type name the feature needs isn't in this file, write it following the naming pattern in the Namespace Reference above and fix from compiler output — producing a `Program.cs` and iterating beats researching.\n\n### Common C# compile errors\n\n- **CS8803 (top-level statements must precede type declarations):** put any `record`/`class`/`struct` definitions **after** the last top-level statement, at the end of the file. A record defined above `var client = new AnthropicClient()` will not compile.\n- **`await foreach` on a `Task<…Page>`:** `client.Models.List()` returns a `Task<ModelListPage>`, which is not directly async-enumerable. Await it first, then iterate: `var page = await client.Models.List(); foreach (var m in page.Items) {…}`. For auto-pagination, check whether the page type exposes `AutoPagingEachAsync()` or similar before reaching for `await foreach`.\n\n## Installation\n\n```bash\ndotnet add package Anthropic\n```\n\n## Client Initialization\n\n```csharp\nusing Anthropic;\n\n// Default (uses ANTHROPIC_API_KEY env var)\nAnthropicClient client = new();\n\n// Explicit API key (use environment variables — never hardcode keys)\nAnthropicClient client = new() {\n    ApiKey = Environment.GetEnvironmentVariable(\"ANTHROPIC_API_KEY\")\n};\n```\n\n---\n\n## Basic Message Request\n\n```csharp\nusing Anthropic.Models.Messages;\n\nvar parameters = new MessageCreateParams\n{\n    Model = Model.ClaudeOpus4_8,\n    MaxTokens = 16000,\n    Messages = [new() { Role = Role.User, Content = \"What is the capital of France?\" }]\n};\nvar response = await client.Messages.Create(parameters);\n\n// ContentBlock is a union wrapper. .Value unwraps to the variant object,\n// then OfType<T> filters to the type you want. Or use the TryPick* idiom\n// shown in the Thinking section below.\nforeach (var text in response.Content.Select(b => b.Value).OfType<TextBlock>())\n{\n    Console.WriteLine(text.Text);\n}\n```\n\n---\n\n## Thinking\n\n**Adaptive thinking is the recommended mode for Claude 4.6+ models.** Claude decides dynamically when and how much to think.\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking (below). `new ThinkingConfigEnabled { BudgetTokens = N }` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `new ThinkingConfigEnabled { BudgetTokens = N }` (budget must be < `MaxTokens`, min 1024).\n\n```csharp\nusing Anthropic.Models.Messages;\n\nvar response = await client.Messages.Create(new MessageCreateParams\n{\n    Model = Model.ClaudeOpus4_8,\n    MaxTokens = 16000,\n    // ThinkingConfigParam? implicitly converts from the concrete variant classes —\n    // no wrapper needed.\n    // display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n    Thinking = new ThinkingConfigAdaptive { Display = Display.Summarized },\n    Messages =\n    [\n        new() { Role = Role.User, Content = \"Solve: 27 * 453\" },\n    ],\n});\n\n// ThinkingBlock(s) precede TextBlock in Content. TryPick* narrows the union.\nforeach (var block in response.Content)\n{\n    if (block.TryPickThinking(out ThinkingBlock? t))\n    {\n        Console.WriteLine($\"[thinking] {t.Thinking}\");\n    }\n    else if (block.TryPickText(out TextBlock? text))\n    {\n        Console.WriteLine(text.Text);\n    }\n}\n```\n\nAlternative to `TryPick*`: `.Select(b => b.Value).OfType<ThinkingBlock>()` (same LINQ pattern as the Basic Message example).\n\n---\n\n## Context Editing / Compaction (Beta)\n\n**Beta-namespace prefix is inconsistent** (source-verified against `src/Anthropic/Models/Beta/Messages/*.cs` @ 12.9.0). No prefix: `MessageCreateParams`, `MessageCountTokensParams`, `Role`, `Speed`. **Everything else has the `Beta` prefix**: `BetaMessageParam`, `BetaMessage`, `BetaContentBlock`, `BetaToolUseBlock`, all block param types. The unprefixed `Role` WILL collide with `Anthropic.Models.Messages.Role` if you import both namespaces (CS0104). Safest: import only Beta; if mixing, alias the beta `Role`:\n\n```csharp\nusing Anthropic.Models.Beta.Messages;\nusing NonBeta = Anthropic.Models.Messages;  // only if you also need non-beta types\n// Now: MessageCreateParams, BetaMessageParam, Role (beta's), NonBeta.Role (if needed)\n```\n\n\n`BetaMessage.Content` is `IReadOnlyList<BetaContentBlock>` — a 15-variant discriminated union. Narrow with `TryPick*`. **Response `BetaContentBlock` is NOT assignable to param `BetaContentBlockParam`** — there's no `.ToParam()` in C#. Round-trip by converting each block:\n\n```csharp\nusing Anthropic.Models.Beta.Messages;\n\nvar betaParams = new MessageCreateParams   // no Beta prefix — see unprefixed list above\n{\n    Model = Model.ClaudeOpus4_8,\n    MaxTokens = 16000,\n    Betas = [\"compact-2026-01-12\"],\n    ContextManagement = new BetaContextManagementConfig\n    {\n        Edits = [new BetaCompact20260112Edit()],\n    },\n    Messages = messages,\n};\nBetaMessage resp = await client.Beta.Messages.Create(betaParams);\n\nforeach (BetaContentBlock block in resp.Content)\n{\n    if (block.TryPickCompaction(out BetaCompactionBlock? compaction))\n    {\n        // Content is nullable — compaction can fail server-side\n        Console.WriteLine($\"compaction summary: {compaction.Content}\");\n    }\n}\n\n// Context-edit metadata lives on a separate nullable field\nif (resp.ContextManagement is { } ctx)\n{\n    foreach (var edit in ctx.AppliedEdits)\n        Console.WriteLine($\"cleared {edit.ClearedInputTokens} tokens\");\n}\n\n// ROUND-TRIP: BetaMessageParam.Content is BetaMessageParamContent (a string|list\n// union). It implicit-converts from List<BetaContentBlockParam>, NOT from the\n// response's IReadOnlyList<BetaContentBlock>. Convert each block:\nList<BetaContentBlockParam> paramBlocks = [];\nforeach (var b in resp.Content)\n{\n    if (b.TryPickText(out var t)) paramBlocks.Add(new BetaTextBlockParam { Text = t.Text });\n    else if (b.TryPickCompaction(out var c)) paramBlocks.Add(new BetaCompactionBlockParam { Content = c.Content });\n    // ... other variants as needed\n}\nmessages.Add(new BetaMessageParam { Role = Role.Assistant, Content = paramBlocks });\n```\n\nAll 15 `BetaContentBlock.TryPick*` variants: `Text`, `Thinking`, `RedactedThinking`, `ToolUse`, `ServerToolUse`, `WebSearchToolResult`, `WebFetchToolResult`, `CodeExecutionToolResult`, `BashCodeExecutionToolResult`, `TextEditorCodeExecutionToolResult`, `ToolSearchToolResult`, `McpToolUse`, `McpToolResult`, `ContainerUpload`, `Compaction`.\n\n**`BetaToolUseBlock.Input` is `IReadOnlyDictionary<string, JsonElement>`** — index by key then call the `JsonElement` extractor:\n\n```csharp\nif (block.TryPickToolUse(out BetaToolUseBlock? tu))\n{\n    int a = tu.Input[\"a\"].GetInt32();\n    string s = tu.Input[\"name\"].GetString()!;\n}\n```\n\n---\n\n## Effort Parameter\n\nEffort is nested under `OutputConfig`, NOT a top-level property. `ApiEnum<string, Effort>` has an implicit conversion from the enum, so assign `Effort.High` directly.\n\n```csharp\nOutputConfig = new OutputConfig { Effort = Effort.High },\n```\n\nValues: `Effort.Low`, `Effort.Medium`, `Effort.High`, `Effort.Max`. Combine with `Thinking = new ThinkingConfigAdaptive()` for cost-quality control.\n\n---\n\n## Prompt Caching\n\n`System` takes `MessageCreateParamsSystem?` — a union of `string` or `List<TextBlockParam>`. There is no `SystemTextBlockParam`; use plain `TextBlockParam`. The implicit conversion needs the concrete `List<TextBlockParam>` type (array literals won't convert). For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.\n\n```csharp\nSystem = new List<TextBlockParam> {\n    new() {\n        Text = longSystemPrompt,\n        CacheControl = new CacheControlEphemeral(),  // auto-sets Type = \"ephemeral\"\n    },\n},\n```\n\nOptional `Ttl` on `CacheControlEphemeral`: `new() { Ttl = Ttl.Ttl1h }` or `Ttl.Ttl5m`. `CacheControl` also exists on `Tool.CacheControl` and top-level `MessageCreateParams.CacheControl`.\n\nVerify hits via `response.Usage.CacheCreationInputTokens` / `response.Usage.CacheReadInputTokens`.\n\n---\n\n## Token Counting\n\n```csharp\nMessageTokensCount result = await client.Messages.CountTokens(new MessageCountTokensParams {\n    Model = Model.ClaudeOpus4_8,\n    Messages = [new() { Role = Role.User, Content = \"Hello\" }],\n});\nlong tokens = result.InputTokens;\n```\n\n`MessageCountTokensParams.Tools` uses a different union type (`MessageCountTokensTool`) than `MessageCreateParams.Tools` (`ToolUnion`) — if you're passing tools, the compiler will tell you when it matters.\n\n---\n\n## PDF / Document Input\n\n`DocumentBlockParam` takes a `DocumentBlockParamSource` union: `Base64PdfSource` / `UrlPdfSource` / `PlainTextSource` / `ContentBlockSource`. `Base64PdfSource` auto-sets `MediaType = \"application/pdf\"` and `Type = \"base64\"`.\n\n```csharp\nnew MessageParam {\n    Role = Role.User,\n    Content = new List<ContentBlockParam> {\n        new DocumentBlockParam { Source = new Base64PdfSource { Data = base64String } },\n        new TextBlockParam { Text = \"Summarize this PDF\" },\n    },\n}\n```\n\n---\n\n## Fast Mode (Beta)\n\n```csharp\nvar response = await client.Beta.Messages.Create(new MessageCreateParams {\n    Model = \"claude-opus-4-8\", MaxTokens = 4096,\n    Speed = Speed.Fast,\n    Betas = [\"fast-mode-2026-02-01\"],\n    Messages = [...],\n});\n```\n\n## Models API\n\n```csharp\nvar page = await client.Models.List();\nforeach (var m in page.Items) { Console.WriteLine(m.ID); }\nvar one = await client.Models.Retrieve(\"claude-opus-4-8\");\n```\n\n## Long Output (128k) + Prefill\n\nSet `MaxTokens = 128000` on `client.Messages` and use the streaming path (see `streaming.md`). On Claude 4+ models, 128k output is native — no `output-128k-*` beta header or beta namespace is needed.\n\n**Prefilling the assistant message** (putting a trailing `Role.Assistant` message in the input) is **not supported** on Claude Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6 — requests return a 400. Use `OutputConfig.Format` (structured outputs) instead.\n\n## Stop Details\n\nWhen `StopReason` is `\"refusal\"`, the response includes structured `StopDetails`:\n\n```csharp\nif (response.StopReason == \"refusal\" && response.StopDetails is { } details)\n{\n    Console.WriteLine($\"Category: {details.Category}\");\n    Console.WriteLine($\"Explanation: {details.Explanation}\");\n}\n```\n\n**Refusal fallbacks (Claude Fable 5) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. In `claude-fable-5` code, include `Fallbacks = [new(Model.ClaudeOpus4_8)]` plus the `AnthropicBeta.ServerSideFallback2026_06_01` beta on the beta messages call by default — a policy decline is re-served by the fallback model inside the same call. Not available on Amazon Bedrock, Vertex AI, or Microsoft Foundry — use the client-side handler there: `new AnthropicClient { Handlers = [new BetaRefusalFallbackHandler { Fallbacks = [new(Model.ClaudeOpus4_8)] }] }` (namespace `Anthropic.Helpers`), with per-conversation state via `BetaFallbackState.Create()` scoped with `using (fallbackState.Use()) { ... }`. Full semantics (billing, sticky routing, streaming) and a runnable example: `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason, and the C# SDK repo's `examples/` (WebFetch via `shared/live-sources.md`).\n\n---\n\n## Managed Agents (Beta)\n\nThe C# SDK supports Managed Agents via `client.Beta.Agents`, `client.Beta.Sessions`, `client.Beta.Environments`, and related namespaces. See `shared/managed-agents-overview.md` for the architecture and `curl/managed-agents.md` for the wire-level reference.\n</doc>\n\n<doc path=\"csharp/claude-api/batches.md\">\n# Message Batches — C#\n\n## Message Batches API\n\n```csharp\nvar batch = await client.Messages.Batches.Create(new() {\n    Requests = [\n        new() { CustomID = \"req-1\", Params = new() { Model = \"claude-opus-4-8\", MaxTokens = 1024, Messages = [...] } },\n    ],\n});\n// Poll client.Messages.Batches.Retrieve(batch.ID) until ProcessingStatus == \"ended\",\n// then iterate client.Messages.Batches.Results(batch.ID).\n```\n</doc>\n\n<doc path=\"csharp/claude-api/files-api.md\">\n# Files API — C#\n\n## Files API (Beta)\n\nFiles live under `client.Beta.Files` (namespace `Anthropic.Models.Beta.Files`). `BinaryContent` implicit-converts from `Stream` and `byte[]`.\n\n```csharp\nusing Anthropic.Models.Beta.Files;\nusing Anthropic.Models.Beta.Messages;\n\nFileMetadata meta = await client.Beta.Files.Upload(\n    new FileUploadParams { File = File.OpenRead(\"doc.pdf\") });\n\n// Referencing the uploaded file requires Beta message types:\nnew BetaRequestDocumentBlock {\n    Source = new BetaFileDocumentSource { FileID = meta.ID },\n}\n```\n\nThe non-beta `DocumentBlockParamSource` union has no file-ID variant — file references need `client.Beta.Messages.Create()`.\n\n---\n</doc>\n\n<doc path=\"csharp/claude-api/streaming.md\">\n# Streaming — C#\n\n## Streaming\n\n```csharp\nusing Anthropic.Models.Messages;\n\nvar parameters = new MessageCreateParams\n{\n    Model = Model.ClaudeOpus4_8,\n    MaxTokens = 64000,\n    Messages = [new() { Role = Role.User, Content = \"Write a haiku\" }]\n};\n\nawait foreach (RawMessageStreamEvent streamEvent in client.Messages.CreateStreaming(parameters))\n{\n    if (streamEvent.TryPickContentBlockDelta(out var delta) &&\n        delta.Delta.TryPickText(out var text))\n    {\n        Console.Write(text.Text);\n    }\n}\n```\n\n**`RawMessageStreamEvent` TryPick methods** (naming drops the `Message`/`Raw` prefix): `TryPickStart`, `TryPickDelta`, `TryPickStop`, `TryPickContentBlockStart`, `TryPickContentBlockDelta`, `TryPickContentBlockStop`. There is no `TryPickMessageStop` — use `TryPickStop`.\n\n---\n</doc>\n\n<doc path=\"csharp/claude-api/tool-use.md\">\n# Tool Use — C#\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Use\n\n### Defining a tool\n\n`Tool` (NOT `ToolParam`) with an `InputSchema` record. `InputSchema.Type` is auto-set to `\"object\"` by the constructor — don't set it. `ToolUnion` has an implicit conversion from `Tool`, triggered by the collection expression `[...]`.\n\n```csharp\nusing System.Text.Json;\nusing Anthropic.Models.Messages;\n\nvar parameters = new MessageCreateParams\n{\n    Model = Model.ClaudeSonnet4_6,\n    MaxTokens = 16000,\n    Tools = [\n        new Tool {\n            Name = \"get_weather\",\n            Description = \"Get the current weather in a given location\",\n            InputSchema = new() {\n                Properties = new Dictionary<string, JsonElement> {\n                    [\"location\"] = JsonSerializer.SerializeToElement(\n                        new { type = \"string\", description = \"City name\" }),\n                },\n                Required = [\"location\"],\n            },\n        },\n    ],\n    Messages = [new() { Role = Role.User, Content = \"Weather in Paris?\" }],\n};\n```\n\nDerived from `anthropic-sdk-csharp/src/Anthropic/Models/Messages/Tool.cs` and `ToolUnion.cs:799` (implicit conversion).\n\nSee [shared tool use concepts](../../shared/tool-use-concepts.md) for the loop pattern.\n### Converting response content to the follow-up assistant message\n\nWhen echoing Claude's response back in the assistant turn, **there is no `.ToParam()` helper** — manually reconstruct each `ContentBlock` variant as its `*Param` counterpart. Do NOT use `new ContentBlockParam(block.Json)`: it compiles and serializes, but `.Value` stays `null` so `TryPick*`/`Validate()` fail (degraded JSON pass-through, not the typed path).\n\n```csharp\nusing Anthropic.Models.Messages;\n\nMessage response = await client.Messages.Create(parameters);\n\n// No .ToParam() — reconstruct per variant. Implicit conversions from each\n// *Param type to ContentBlockParam mean no explicit wrapper.\nList<ContentBlockParam> assistantContent = [];\nList<ContentBlockParam> toolResults = [];\nforeach (ContentBlock block in response.Content)\n{\n    if (block.TryPickText(out TextBlock? text))\n    {\n        assistantContent.Add(new TextBlockParam { Text = text.Text });\n    }\n    else if (block.TryPickThinking(out ThinkingBlock? thinking))\n    {\n        // Signature MUST be preserved — the API rejects tampering\n        assistantContent.Add(new ThinkingBlockParam\n        {\n            Thinking = thinking.Thinking,\n            Signature = thinking.Signature,\n        });\n    }\n    else if (block.TryPickRedactedThinking(out RedactedThinkingBlock? redacted))\n    {\n        assistantContent.Add(new RedactedThinkingBlockParam { Data = redacted.Data });\n    }\n    else if (block.TryPickToolUse(out ToolUseBlock? toolUse))\n    {\n        // ToolUseBlock has required Caller; ToolUseBlockParam.Caller is optional — don't copy it\n        assistantContent.Add(new ToolUseBlockParam\n        {\n            ID = toolUse.ID,\n            Name = toolUse.Name,\n            Input = toolUse.Input,\n        });\n        // Execute the tool; collect ONE result per tool_use block — the API\n        // rejects the follow-up if any tool_use ID lacks a matching tool_result.\n        string result = ExecuteYourTool(toolUse.Name, toolUse.Input);\n        toolResults.Add(new ToolResultBlockParam\n        {\n            ToolUseID = toolUse.ID,\n            Content = result,\n        });\n    }\n}\n\n// Follow-up: prior messages + assistant echo + user tool_result(s)\nList<MessageParam> followUpMessages =\n[\n    .. parameters.Messages,\n    new() { Role = Role.Assistant, Content = assistantContent },\n    new() { Role = Role.User, Content = toolResults },\n];\n```\n\n`ToolResultBlockParam` has no tuple constructor — use the object initializer. `Content` is a string-or-list union; a plain `string` implicitly converts.\n\n---\n\n## Structured Output\n\n```csharp\nOutputConfig = new OutputConfig {\n    Format = new JsonOutputFormat {\n        Schema = new Dictionary<string, JsonElement> {\n            [\"type\"] = JsonSerializer.SerializeToElement(\"object\"),\n            [\"properties\"] = JsonSerializer.SerializeToElement(\n                new { name = new { type = \"string\" } }),\n            [\"required\"] = JsonSerializer.SerializeToElement(new[] { \"name\" }),\n        },\n    },\n},\n```\n\n`JsonOutputFormat.Type` is auto-set to `\"json_schema\"` by the constructor. `Schema` is `required`.\n\n---\n\n## Anthropic-Defined Tools\n\nWeb search, bash, text editor, and code execution are Anthropic-defined tools with built-in schemas. Web search and code execution are server-executed; bash and text editor are client-executed (you handle the `tool_use` locally — see `shared/tool-use-concepts.md`). Type names are version-suffixed; constructors auto-set `name`/`type`. **Wrap each in `new ToolUnion(...)` explicitly.**\n\n```csharp\nTools = [\n    new ToolUnion(new WebSearchTool20260209()),\n    new ToolUnion(new ToolBash20250124()),\n    new ToolUnion(new ToolTextEditor20250728()),\n    new ToolUnion(new CodeExecutionTool20260120()),\n],\n```\n\nAlso available: `new ToolUnion(new WebFetchTool20260209())`, `new ToolUnion(new MemoryTool20250818())`. `WebSearchTool20260209` optionals: `AllowedDomains`, `BlockedDomains`, `MaxUses`, `UserLocation`.\n\n---\n\n## Tool Runner (Beta)\n\nThe C# SDK provides a `BetaToolRunner` for automatic tool execution loops. Define tools with raw JSON schemas, and the runner handles the API call → tool execution → result feedback loop.\n\n```csharp\nusing Anthropic.Models.Beta.Messages;\n\n// Define tools and create params as shown in the Tool Use section above,\n// but using the beta namespace types (BetaToolUnion, etc.)\nvar runner = client.Beta.Messages.ToolRunner(betaParams);\n\nawait foreach (BetaMessage message in runner)\n{\n    foreach (var block in message.Content)\n    {\n        if (block.TryPickText(out var text))\n        {\n            Console.WriteLine(text.Text);\n        }\n    }\n}\n```\n\n---\n</doc>\n\n<doc path=\"curl/examples.md\">\n# Claude API — cURL / Raw HTTP\n\nUse these examples when the user needs raw HTTP requests or is working in a language without an official SDK.\n\n## Setup\n\n```bash\nexport ANTHROPIC_API_KEY=\"your-api-key\"\n```\n\n---\n\n## Basic Message Request\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 16000,\n    \"messages\": [\n      {\"role\": \"user\", \"content\": \"What is the capital of France?\"}\n    ]\n  }'\n```\n\n### Parsing the response\n\nUse `jq` to extract fields from the JSON response. Do not use `grep`/`sed` —\nJSON strings can contain any character and regex parsing will break on quotes,\nescapes, or multi-line content.\n\n```bash\n# Capture the response, then extract fields\nresponse=$(curl -s https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\"model\":\"claude-opus-4-8\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}')\n\n# Print the first text block (-r strips the JSON quotes)\necho \"$response\" | jq -r '.content[0].text'\n\n# Read usage fields\ninput_tokens=$(echo \"$response\" | jq -r '.usage.input_tokens')\noutput_tokens=$(echo \"$response\" | jq -r '.usage.output_tokens')\n\n# Read stop reason (for tool-use loops)\nstop_reason=$(echo \"$response\" | jq -r '.stop_reason')\n\n# Extract all text blocks (content is an array; filter to type==\"text\")\necho \"$response\" | jq -r '.content[] | select(.type == \"text\") | .text'\n```\n\n\n---\n\n## Streaming (SSE)\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 64000,\n    \"stream\": true,\n    \"messages\": [{\"role\": \"user\", \"content\": \"Write a haiku\"}]\n  }'\n```\n\nThe response is a stream of Server-Sent Events:\n\n```\nevent: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_...\",\"type\":\"message\",...}}\n\nevent: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}\n\nevent: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"Hello\"}}\n\nevent: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\nevent: message_delta\ndata: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":12}}\n\nevent: message_stop\ndata: {\"type\":\"message_stop\"}\n```\n\n---\n\n## Tool Use\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 16000,\n    \"tools\": [{\n      \"name\": \"get_weather\",\n      \"description\": \"Get current weather for a location\",\n      \"input_schema\": {\n        \"type\": \"object\",\n        \"properties\": {\n          \"location\": {\"type\": \"string\", \"description\": \"City name\"}\n        },\n        \"required\": [\"location\"]\n      }\n    }],\n    \"messages\": [{\"role\": \"user\", \"content\": \"What is the weather in Paris?\"}]\n  }'\n```\n\nWhen Claude responds with a `tool_use` block, send the result back:\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 16000,\n    \"tools\": [{\n      \"name\": \"get_weather\",\n      \"description\": \"Get current weather for a location\",\n      \"input_schema\": {\n        \"type\": \"object\",\n        \"properties\": {\n          \"location\": {\"type\": \"string\", \"description\": \"City name\"}\n        },\n        \"required\": [\"location\"]\n      }\n    }],\n    \"messages\": [\n      {\"role\": \"user\", \"content\": \"What is the weather in Paris?\"},\n      {\"role\": \"assistant\", \"content\": [\n        {\"type\": \"text\", \"text\": \"Let me check the weather.\"},\n        {\"type\": \"tool_use\", \"id\": \"toolu_abc123\", \"name\": \"get_weather\", \"input\": {\"location\": \"Paris\"}}\n      ]},\n      {\"role\": \"user\", \"content\": [\n        {\"type\": \"tool_result\", \"tool_use_id\": \"toolu_abc123\", \"content\": \"72°F and sunny\"}\n      ]}\n    ]\n  }'\n```\n\n---\n\n## Prompt Caching\n\nPut `cache_control` on the last block of the stable prefix. See `shared/prompt-caching.md` for placement patterns and the silent-invalidator audit checklist.\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 16000,\n    \"system\": [\n      {\"type\": \"text\", \"text\": \"<large shared prompt...>\", \"cache_control\": {\"type\": \"ephemeral\"}}\n    ],\n    \"messages\": [{\"role\": \"user\", \"content\": \"Summarize the key points\"}]\n  }'\n```\n\nFor 1-hour TTL: `\"cache_control\": {\"type\": \"ephemeral\", \"ttl\": \"1h\"}`. Top-level `\"cache_control\"` on the request body auto-places on the last cacheable block. Verify hits via the response `usage.cache_creation_input_tokens` / `usage.cache_read_input_tokens` fields.\n\n---\n\n## Extended Thinking\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking. `budget_tokens` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `\"type\": \"enabled\"` with `\"budget_tokens\": N` (must be < `max_tokens`, min 1024).\n\n```bash\n# Fable 5 / Opus 4.8 / 4.7 / 4.6: adaptive thinking (recommended)\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -d '{\n    \"model\": \"claude-opus-4-8\",\n    \"max_tokens\": 16000,\n    \"thinking\": {\n      \"type\": \"adaptive\",\n      \"display\": \"summarized\"\n    },\n    \"output_config\": {\n      \"effort\": \"high\"\n    },\n    \"messages\": [{\"role\": \"user\", \"content\": \"Solve this step by step...\"}]\n  }'\n```\n\n---\n\n## Refusal Fallbacks (Claude Fable 5) — opt in by default\n\nOn `claude-fable-5`, safety classifiers may decline a request (HTTP 200 with `stop_reason: \"refusal\"`). Fallbacks are **opt-in**: without them the request simply stops. Include the `fallbacks` parameter and its beta header by default — on a policy decline the API re-runs the same request on the fallback model inside the same call. A decline before any output isn't billed (a mid-stream decline bills the streamed partial); the rescue bills at the fallback model's own rates.\n\n```bash\nresponse=$(curl -s https://api.anthropic.com/v1/messages \\\n  -H \"Content-Type: application/json\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: server-side-fallback-2026-06-01\" \\\n  -d '{\n    \"model\": \"claude-fable-5\",\n    \"max_tokens\": 16000,\n    \"fallbacks\": [{\"model\": \"claude-opus-4-8\"}],\n    \"messages\": [{\"role\": \"user\", \"content\": \"Hello\"}]\n  }')\n\n# Which model produced the message\necho \"$response\" | jq -r '.model'\n\n# Refusal on the final response means the whole chain refused\necho \"$response\" | jq -r '.stop_reason'\n\n# Switch points: one fallback block per model that ran and declined this turn\necho \"$response\" | jq -r '.content[] | select(.type == \"fallback\") | \"\\(.from.model) declined; \\(.to.model) continued\"'\n\n# Served-by signal — covers sticky turns, which carry no fallback block.\n# Pair with stop_reason: the fallback model can itself refuse.\nif [ \"$(echo \"$response\" | jq -r '.stop_reason')\" != \"refusal\" ] && \\\n   echo \"$response\" | jq -e '[.usage.iterations[]? | select(.type == \"fallback_message\")] | length > 0' > /dev/null; then\n  echo \"fallback model served this turn\"\nfi\n```\n\nThe header must be exactly `server-side-fallback-2026-06-01`. The parameter is rejected on the Batches API and unavailable on Amazon Bedrock, Vertex AI, and Microsoft Foundry. Full semantics (sticky routing, billing, streaming, echoing fallback turns back): `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Required Headers\n\n| Header              | Value              | Description                |\n| ------------------- | ------------------ | -------------------------- |\n| `Content-Type`      | `application/json` | Required                   |\n| `x-api-key`         | Your API key       | Authentication             |\n| `anthropic-version` | `2023-06-01`       | API version                |\n| `anthropic-beta`    | Beta feature IDs   | Required for beta features |\n</doc>\n\n<doc path=\"curl/managed-agents.md\">\n# Managed Agents — cURL / Raw HTTP\n\nUse these examples when the user needs raw HTTP requests or is working without an SDK.\n\n## Setup\n\n```bash\nexport ANTHROPIC_API_KEY=\"your-api-key\"\n\n# Common headers\nHEADERS=(\n  -H \"Content-Type: application/json\"\n  -H \"x-api-key: $ANTHROPIC_API_KEY\"\n  -H \"anthropic-version: 2023-06-01\"\n  -H \"anthropic-beta: managed-agents-2026-04-01\"\n)\n```\n\n---\n\n## Create an Environment\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/environments \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"my-dev-env\",\n    \"config\": {\n      \"type\": \"cloud\",\n      \"networking\": { \"type\": \"unrestricted\" }\n    }\n  }'\n```\n\n### With restricted networking\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/environments \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"restricted-env\",\n    \"config\": {\n      \"type\": \"cloud\",\n      \"networking\": {\n        \"type\": \"limited\",\n        \"allow_package_managers\": true,\n        \"allow_mcp_servers\": true,\n        \"allowed_hosts\": [\"api.example.com\"]\n      }\n    }\n  }'\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** Under `managed-agents-2026-04-01`, `model`/`system`/`tools` are top-level fields on `POST /v1/agents`, not on the session. Always create the agent first — the session only takes `\"agent\": {\"type\": \"agent\", \"id\": \"...\"}`.\n\n### Minimal\n\n```bash\n# 1. Create the agent\ncurl -X POST https://api.anthropic.com/v1/agents \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"Coding Assistant\",\n    \"model\": \"claude-opus-4-8\",\n    \"tools\": [{ \"type\": \"agent_toolset_20260401\" }]\n  }'\n# → { \"id\": \"agent_abc123\", ... }\n\n# 2. Start a session\ncurl -X POST https://api.anthropic.com/v1/sessions \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"agent\": { \"type\": \"agent\", \"id\": \"agent_abc123\", \"version\": \"1772585501101368014\" },\n    \"environment_id\": \"env_abc123\"\n  }'\n# → { \"id\": \"sesn_abc123\", ... }\n# Trace: https://platform.claude.com/workspaces/default/sessions/sesn_abc123\n```\n\n### With system prompt, custom tools, and GitHub repo\n\n```bash\n# 1. Create the agent\ncurl -X POST https://api.anthropic.com/v1/agents \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"Code Reviewer\",\n    \"model\": \"claude-opus-4-8\",\n    \"system\": \"You are a senior code reviewer. Be thorough and constructive.\",\n    \"tools\": [\n      { \"type\": \"agent_toolset_20260401\" },\n      {\n        \"type\": \"custom\",\n        \"name\": \"run_linter\",\n        \"description\": \"Run the project linter on a file\",\n        \"input_schema\": {\n          \"type\": \"object\",\n          \"properties\": {\n            \"file_path\": { \"type\": \"string\", \"description\": \"Path to lint\" }\n          },\n          \"required\": [\"file_path\"]\n        }\n      }\n    ]\n  }'\n\n# 2. Start a session with the repo mounted\ncurl -X POST https://api.anthropic.com/v1/sessions \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"agent\": { \"type\": \"agent\", \"id\": \"agent_abc123\", \"version\": \"1772585501101368014\" },\n    \"environment_id\": \"env_abc123\",\n    \"title\": \"Code review session\",\n    \"resources\": [\n      {\n        \"type\": \"github_repository\",\n        \"url\": \"https://github.com/owner/repo\",\n        \"mount_path\": \"/workspace/repo\",\n        \"authorization_token\": \"ghp_...\",\n        \"branch\": \"feature-branch\"\n      }\n    ]\n  }'\n```\n\n---\n\n## Send a User Message\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/sessions/$SESSION_ID/events \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"events\": [\n      {\n        \"type\": \"user.message\",\n        \"content\": [{ \"type\": \"text\", \"text\": \"Review the auth module for security issues\" }]\n      }\n    ]\n  }'\n```\n\n---\n\n## Stream Events (SSE)\n\n```bash\ncurl -N https://api.anthropic.com/v1/sessions/$SESSION_ID/events/stream \\\n  \"${HEADERS[@]}\"\n```\n\nResponse format:\n\n```\nevent: session.status_running\ndata: {\"type\":\"session.status_running\",\"id\":\"sevt_...\",\"processed_at\":\"...\"}\n\nevent: agent.message\ndata: {\"type\":\"agent.message\",\"id\":\"sevt_...\",\"content\":[{\"type\":\"text\",\"text\":\"I'll review...\"}],\"processed_at\":\"...\"}\n\nevent: session.status_idle\ndata: {\"type\":\"session.status_idle\",\"id\":\"sevt_...\",\"processed_at\":\"...\"}\n```\n\n---\n\n## Poll Events\n\n```bash\n# Get all events\ncurl https://api.anthropic.com/v1/sessions/$SESSION_ID/events \\\n  \"${HEADERS[@]}\"\n\n# Paginated — get next page of events\ncurl \"https://api.anthropic.com/v1/sessions/$SESSION_ID/events?page=page_abc123\" \\\n  \"${HEADERS[@]}\"\n```\n\n---\n\n## Provide Custom Tool Result\n\nWhen the agent calls a custom tool, send the result back:\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/sessions/$SESSION_ID/events \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"events\": [\n      {\n        \"type\": \"user.custom_tool_result\",\n        \"custom_tool_use_id\": \"sevt_abc123\",\n        \"content\": [{ \"type\": \"text\", \"text\": \"No linting errors found.\" }]\n      }\n    ]\n  }'\n```\n\n---\n\n## Interrupt a Running Session\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/sessions/$SESSION_ID/events \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"events\": [\n      {\n        \"type\": \"interrupt\"\n      }\n    ]\n  }'\n```\n\n---\n\n## Get Session Details\n\n```bash\ncurl https://api.anthropic.com/v1/sessions/$SESSION_ID \\\n  \"${HEADERS[@]}\"\n```\n\n---\n\n## List Sessions\n\n```bash\ncurl https://api.anthropic.com/v1/sessions \\\n  \"${HEADERS[@]}\"\n```\n\n---\n\n## Delete a Session\n\n```bash\ncurl -X DELETE https://api.anthropic.com/v1/sessions/$SESSION_ID \\\n  \"${HEADERS[@]}\"\n```\n\n---\n\n## Upload a File\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/files \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: files-api-2025-04-14\" \\\n  -F \"file=@path/to/file.txt\" \\\n  -F \"purpose=agent\"\n```\n\n---\n\n## List and Download Session Files\n\nList files the agent wrote to `/mnt/session/outputs/` during a session, then download them.\n\n```bash\n# List files associated with a session\ncurl \"https://api.anthropic.com/v1/files?scope_id=$SESSION_ID\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: files-api-2025-04-14,managed-agents-2026-04-01\"\n\n# Download a specific file\ncurl \"https://api.anthropic.com/v1/files/$FILE_ID/content\" \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: files-api-2025-04-14,managed-agents-2026-04-01\" \\\n  -o downloaded_file.txt\n```\n\n---\n\n## List Agents\n\n```bash\ncurl https://api.anthropic.com/v1/agents \\\n  \"${HEADERS[@]}\"\n```\n\n---\n\n## MCP Server Integration\n\n```bash\n# 1. Agent declares MCP server (no auth here — auth goes in a vault)\ncurl -X POST https://api.anthropic.com/v1/agents \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"MCP Agent\",\n    \"model\": \"claude-opus-4-8\",\n    \"mcp_servers\": [\n      { \"type\": \"url\", \"name\": \"my-tools\", \"url\": \"https://my-mcp-server.example.com/sse\" }\n    ],\n    \"tools\": [\n      { \"type\": \"agent_toolset_20260401\" },\n      { \"type\": \"mcp_toolset\", \"mcp_server_name\": \"my-tools\" }\n    ]\n  }'\n\n# 2. Session attaches vault containing credentials for that MCP server URL\ncurl -X POST https://api.anthropic.com/v1/sessions \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"agent\": \"agent_abc123\",\n    \"environment_id\": \"env_abc123\",\n    \"vault_ids\": [\"vlt_abc123\"]\n  }'\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n\n---\n\n## Tool Configuration\n\n```bash\ncurl -X POST https://api.anthropic.com/v1/agents \\\n  \"${HEADERS[@]}\" \\\n  -d '{\n    \"name\": \"Restricted Agent\",\n    \"model\": \"claude-opus-4-8\",\n    \"tools\": [\n      {\n        \"type\": \"agent_toolset_20260401\",\n        \"default_config\": { \"enabled\": true },\n        \"configs\": [\n          { \"name\": \"bash\", \"enabled\": false }\n        ]\n      }\n    ]\n  }'\n```\n</doc>\n\n<doc path=\"go/claude-api/README.md\">\n# Claude API — Go\n\n> **Note:** The Go SDK supports the Claude API and beta tool use with `BetaToolRunner`. Agent SDK is not yet available for Go.\n\n## Installation\n\n```bash\ngo get github.com/anthropics/anthropic-sdk-go\n```\n\n## Client Initialization\n\n```go\nimport (\n    \"github.com/anthropics/anthropic-sdk-go\"\n    \"github.com/anthropics/anthropic-sdk-go/option\"\n)\n\n// Default (uses ANTHROPIC_API_KEY env var)\nclient := anthropic.NewClient()\n\n// Explicit API key\nclient := anthropic.NewClient(\n    option.WithAPIKey(\"your-api-key\"),\n)\n```\n\n---\n\n## Model Constants\n\nThe Go SDK provides typed model constants: `anthropic.ModelClaudeFable5`, `anthropic.ModelClaudeOpus4_8`, `anthropic.ModelClaudeOpus4_7`, `anthropic.ModelClaudeSonnet4_6`, `anthropic.ModelClaudeHaiku4_5_20251001`. Use `ModelClaudeOpus4_8` unless the user specifies otherwise; if they ask for Fable or the most powerful model, use `anthropic.ModelClaudeFable5` (see `shared/models.md` for the full resolution table).\n\n---\n\n## Basic Message Request\n\n```go\nresponse, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{\n    Model:     anthropic.ModelClaudeOpus4_8,\n    MaxTokens: 16000,\n    Messages: []anthropic.MessageParam{\n        anthropic.NewUserMessage(anthropic.NewTextBlock(\"What is the capital of France?\")),\n    },\n})\nif err != nil {\n    log.Fatal(err)\n}\nfor _, block := range response.Content {\n    switch variant := block.AsAny().(type) {\n    case anthropic.TextBlock:\n        fmt.Println(variant.Text)\n    }\n}\n```\n\n---\n\n## Thinking\n\nEnable Claude's internal reasoning by setting `Thinking` in `MessageNewParams`. The response will contain `ThinkingBlock` content before the final `TextBlock`.\n\n**Adaptive thinking is the recommended mode for Claude 4.6+ models.** Claude decides dynamically when and how much to think. Combine with the `effort` parameter for cost-quality control.\n\nDerived from `anthropic-sdk-go/message.go` (`ThinkingConfigParamUnion`, `ThinkingConfigAdaptiveParam`).\n\n```go\n// There is no ThinkingConfigParamOfAdaptive helper — construct the union\n// struct-literal directly and take the address of the variant.\nadaptive := anthropic.ThinkingConfigAdaptiveParam{}\nparams := anthropic.MessageNewParams{\n    Model:     anthropic.ModelClaudeSonnet4_6,\n    MaxTokens: 16000,\n    Thinking:  anthropic.ThinkingConfigParamUnion{OfAdaptive: &adaptive},\n    Messages: []anthropic.MessageParam{\n        anthropic.NewUserMessage(anthropic.NewTextBlock(\"How many r's in strawberry?\")),\n    },\n}\n\nresp, err := client.Messages.New(context.Background(), params)\nif err != nil {\n    log.Fatal(err)\n}\n\n// ThinkingBlock(s) precede TextBlock in content\nfor _, block := range resp.Content {\n    switch b := block.AsAny().(type) {\n    case anthropic.ThinkingBlock:\n        fmt.Println(\"[thinking]\", b.Thinking)\n    case anthropic.TextBlock:\n        fmt.Println(b.Text)\n    }\n}\n```\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking (above). `ThinkingConfigParamOfEnabled(budgetTokens)` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `anthropic.ThinkingConfigParamOfEnabled(N)` (budget must be < `MaxTokens`, min 1024).\n\nTo disable: `anthropic.ThinkingConfigParamUnion{OfDisabled: &anthropic.ThinkingConfigDisabledParam{}}`.\n\n---\n\n## Prompt Caching\n\n`System` is `[]TextBlockParam`; set `CacheControl` on the last block to cache tools + system together. For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.\n\n```go\nSystem: []anthropic.TextBlockParam{{\n    Text:         longSystemPrompt,\n    CacheControl: anthropic.NewCacheControlEphemeralParam(), // default 5m TTL\n}},\n```\n\nFor 1-hour TTL: `anthropic.CacheControlEphemeralParam{TTL: anthropic.CacheControlEphemeralTTLTTL1h}`. There's also a top-level `CacheControl` on `MessageNewParams` that auto-places on the last cacheable block.\n\nVerify hits via `resp.Usage.CacheCreationInputTokens` / `resp.Usage.CacheReadInputTokens`.\n\n---\n\n## Stop Details\n\nWhen `StopReason` is `anthropic.StopReasonRefusal`, the response includes structured `StopDetails`:\n\n```go\nif resp.StopReason == anthropic.StopReasonRefusal {\n    fmt.Println(\"Category:\", resp.StopDetails.Category)     // e.g. \"cyber\", \"bio\", \"reasoning_extraction\", \"frontier_llm\", or \"\" — see docs for the full set\n    fmt.Println(\"Explanation:\", resp.StopDetails.Explanation)\n}\n```\n\n**Refusal fallbacks (Claude Fable 5) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. In `claude-fable-5` code, include `Fallbacks: []anthropic.BetaFallbackParam{{Model: \"claude-opus-4-8\"}}` plus the `anthropic.AnthropicBetaServerSideFallback2026_06_01` beta on `client.Beta.Messages.New` by default — a policy decline is re-served by the fallback model inside the same call. Not available on Amazon Bedrock, Vertex AI, or Microsoft Foundry — register the client-side middleware there: `option.WithMiddleware(betafallback.BetaRefusalFallbackMiddleware(...))` from `lib/betafallback`, with per-conversation state via `betafallback.WithBetaFallbackState(&betafallback.BetaFallbackState{})`. Full semantics (billing, sticky routing, streaming) and a runnable example: `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason, and the Go SDK repo's `examples/` (WebFetch via `shared/live-sources.md`).\n\n---\n\n## PDF / Document Input\n\n`NewDocumentBlock` generic helper accepts any source type. `MediaType`/`Type` are auto-set.\n\n```go\nb64 := base64.StdEncoding.EncodeToString(pdfBytes)\n\nmsg := anthropic.NewUserMessage(\n    anthropic.NewDocumentBlock(anthropic.Base64PDFSourceParam{Data: b64}),\n    anthropic.NewTextBlock(\"Summarize this document\"),\n)\n```\n\nOther sources: `URLPDFSourceParam{URL: \"https://...\"}`, `PlainTextSourceParam{Data: \"...\"}`.\n\n---\n\n## Context Editing / Compaction (Beta)\n\nUse `Beta.Messages.New` with `ContextManagement` on `BetaMessageNewParams`. There is no `NewBetaAssistantMessage` — use `.ToParam()` for the round-trip.\n\n```go\nparams := anthropic.BetaMessageNewParams{\n    Model:     anthropic.ModelClaudeOpus4_8,  // also supported: ModelClaudeSonnet4_6\n    MaxTokens: 16000,\n    Betas:     []anthropic.AnthropicBeta{\"compact-2026-01-12\"},\n    ContextManagement: anthropic.BetaContextManagementConfigParam{\n        Edits: []anthropic.BetaContextManagementConfigEditUnionParam{\n            {OfCompact20260112: &anthropic.BetaCompact20260112EditParam{}},\n        },\n    },\n    Messages: []anthropic.BetaMessageParam{ /* ... */ },\n}\n\nresp, err := client.Beta.Messages.New(ctx, params)\nif err != nil {\n    log.Fatal(err)\n}\n\n// Round-trip: append response to history via .ToParam()\nparams.Messages = append(params.Messages, resp.ToParam())\n\n// Read compaction blocks from the response\nfor _, block := range resp.Content {\n    if c, ok := block.AsAny().(anthropic.BetaCompactionBlock); ok {\n        fmt.Println(\"compaction summary:\", c.Content)\n    }\n}\n```\n\nOther edit types: `BetaClearToolUses20250919EditParam`, `BetaClearThinking20251015EditParam` — these need `Betas: []anthropic.AnthropicBeta{\"context-management-2025-06-27\"}`, not `compact-2026-01-12`.\n</doc>\n\n<doc path=\"go/claude-api/files-api.md\">\n# Files API — Go\n\n## Files API (Beta)\n\nUnder `client.Beta.Files`. Method is **`Upload`** (NOT `New`/`Create`), params struct is `BetaFileUploadParams`. The `File` field takes an `io.Reader`; use `anthropic.File()` to attach a filename + content-type for the multipart encoding.\n\n```go\nf, _ := os.Open(\"./upload_me.txt\")\ndefer f.Close()\n\nmeta, err := client.Beta.Files.Upload(ctx, anthropic.BetaFileUploadParams{\n    File:  anthropic.File(f, \"upload_me.txt\", \"text/plain\"),\n    Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},\n})\n// meta.ID is the file_id to reference in subsequent message requests\n```\n\nOther `Beta.Files` methods: `List`, `Delete`, `Download`, `GetMetadata`.\n\n---\n</doc>\n\n<doc path=\"go/claude-api/streaming.md\">\n# Streaming — Go\n\n## Streaming\n\n```go\nstream := client.Messages.NewStreaming(context.Background(), anthropic.MessageNewParams{\n    Model:     anthropic.ModelClaudeOpus4_8,\n    MaxTokens: 64000,\n    Messages: []anthropic.MessageParam{\n        anthropic.NewUserMessage(anthropic.NewTextBlock(\"Write a haiku\")),\n    },\n})\n\nfor stream.Next() {\n    event := stream.Current()\n    switch eventVariant := event.AsAny().(type) {\n    case anthropic.ContentBlockDeltaEvent:\n        switch deltaVariant := eventVariant.Delta.AsAny().(type) {\n        case anthropic.TextDelta:\n            fmt.Print(deltaVariant.Text)\n        }\n    }\n}\nif err := stream.Err(); err != nil {\n    log.Fatal(err)\n}\n```\n\n**Accumulating the final message** (there is no `GetFinalMessage()` on the stream):\n\n```go\nstream := client.Messages.NewStreaming(ctx, params)\nmessage := anthropic.Message{}\nfor stream.Next() {\n    message.Accumulate(stream.Current())\n}\nif err := stream.Err(); err != nil { log.Fatal(err) }\n// message.Content now has the complete response\n```\n\n\n---\n</doc>\n\n<doc path=\"go/claude-api/tool-use.md\">\n# Tool Use — Go\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Use\n\n### Tool Runner (Beta — Recommended)\n\n**Beta:** The Go SDK provides `BetaToolRunner` for automatic tool use loops via the `toolrunner` package.\n\n```go\nimport (\n    \"context\"\n    \"fmt\"\n    \"log\"\n\n    \"github.com/anthropics/anthropic-sdk-go\"\n    \"github.com/anthropics/anthropic-sdk-go/toolrunner\"\n)\n\n// Define tool input with jsonschema tags for automatic schema generation\ntype GetWeatherInput struct {\n    City string `json:\"city\" jsonschema:\"required,description=The city name\"`\n}\n\n// Create a tool with automatic schema generation from struct tags\nweatherTool, err := toolrunner.NewBetaToolFromJSONSchema(\n    \"get_weather\",\n    \"Get current weather for a city\",\n    func(ctx context.Context, input GetWeatherInput) (anthropic.BetaToolResultBlockParamContentUnion, error) {\n        return anthropic.BetaToolResultBlockParamContentUnion{\n            OfText: &anthropic.BetaTextBlockParam{\n                Text: fmt.Sprintf(\"The weather in %s is sunny, 72°F\", input.City),\n            },\n        }, nil\n    },\n)\nif err != nil {\n    log.Fatal(err)\n}\n\n// Create a tool runner that handles the conversation loop automatically\nrunner := client.Beta.Messages.NewToolRunner(\n    []anthropic.BetaTool{weatherTool},\n    anthropic.BetaToolRunnerParams{\n        BetaMessageNewParams: anthropic.BetaMessageNewParams{\n            Model:     anthropic.ModelClaudeOpus4_8,\n            MaxTokens: 16000,\n            Messages: []anthropic.BetaMessageParam{\n                anthropic.NewBetaUserMessage(anthropic.NewBetaTextBlock(\"What's the weather in Paris?\")),\n            },\n        },\n        MaxIterations: 5,\n    },\n)\n\n// Run until Claude produces a final response\nmessage, err := runner.RunToCompletion(context.Background())\nif err != nil {\n    log.Fatal(err)\n}\n\n// RunToCompletion returns *BetaMessage; content is []BetaContentBlockUnion.\n// Narrow via AsAny() switch — note the Beta-namespace types (BetaTextBlock,\n// not TextBlock):\nfor _, block := range message.Content {\n    switch block := block.AsAny().(type) {\n    case anthropic.BetaTextBlock:\n        fmt.Println(block.Text)\n    }\n}\n```\n\n**Key features of the Go tool runner:**\n\n- Automatic schema generation from Go structs via `jsonschema` tags\n- `RunToCompletion()` for simple one-shot usage\n- `All()` iterator for processing each message in the conversation\n- `NextMessage()` for step-by-step iteration\n- Streaming variant via `NewToolRunnerStreaming()` with `AllStreaming()`\n\n### Manual Loop\n\nFor fine-grained control over the agentic loop, define tools with `ToolParam`, check `StopReason`, execute tools yourself, and feed `tool_result` blocks back. This is the pattern when you need to intercept, validate, or log tool calls.\n\nDerived from `anthropic-sdk-go/examples/tools/main.go`.\n\n```go\npackage main\n\nimport (\n    \"context\"\n    \"encoding/json\"\n    \"fmt\"\n    \"log\"\n\n    \"github.com/anthropics/anthropic-sdk-go\"\n)\n\nfunc main() {\n    client := anthropic.NewClient()\n\n    // 1. Define tools. ToolParam.InputSchema uses a map, no struct tags needed.\n    addTool := anthropic.ToolParam{\n        Name:        \"add\",\n        Description: anthropic.String(\"Add two integers\"),\n        InputSchema: anthropic.ToolInputSchemaParam{\n            Properties: map[string]any{\n                \"a\": map[string]any{\"type\": \"integer\"},\n                \"b\": map[string]any{\"type\": \"integer\"},\n            },\n        },\n    }\n    // ToolParam must be wrapped in ToolUnionParam for the Tools slice\n    tools := []anthropic.ToolUnionParam{{OfTool: &addTool}}\n\n    messages := []anthropic.MessageParam{\n        anthropic.NewUserMessage(anthropic.NewTextBlock(\"What is 2 + 3?\")),\n    }\n\n    for {\n        resp, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{\n            Model:     anthropic.ModelClaudeSonnet4_6,\n            MaxTokens: 16000,\n            Messages:  messages,\n            Tools:     tools,\n        })\n        if err != nil {\n            log.Fatal(err)\n        }\n\n        // 2. Append the assistant response to history BEFORE processing tool calls.\n        //    resp.ToParam() converts Message → MessageParam in one call.\n        messages = append(messages, resp.ToParam())\n\n        // 3. Walk content blocks. ContentBlockUnion is a flattened struct;\n        //    use block.AsAny().(type) to switch on the actual variant.\n        toolResults := []anthropic.ContentBlockParamUnion{}\n        for _, block := range resp.Content {\n            switch variant := block.AsAny().(type) {\n            case anthropic.TextBlock:\n                fmt.Println(variant.Text)\n            case anthropic.ToolUseBlock:\n                // 4. Parse the tool input. Use variant.JSON.Input.Raw() to get the\n                //    raw JSON — block.Input is json.RawMessage, not the parsed value.\n                var in struct {\n                    A int `json:\"a\"`\n                    B int `json:\"b\"`\n                }\n                if err := json.Unmarshal([]byte(variant.JSON.Input.Raw()), &in); err != nil {\n                    log.Fatal(err)\n                }\n                result := fmt.Sprintf(\"%d\", in.A+in.B)\n                // 5. NewToolResultBlock(toolUseID, content, isError) builds the\n                //    ContentBlockParamUnion for you. block.ID is the tool_use_id.\n                toolResults = append(toolResults,\n                    anthropic.NewToolResultBlock(block.ID, result, false))\n            }\n        }\n\n        // 6. Exit when Claude stops asking for tools\n        if resp.StopReason != anthropic.StopReasonToolUse {\n            break\n        }\n\n        // 7. Tool results go in a user message (variadic: all results in one turn)\n        messages = append(messages, anthropic.NewUserMessage(toolResults...))\n    }\n}\n```\n\n**Key API surface:**\n\n| Symbol | Purpose |\n|---|---|\n| `resp.ToParam()` | Convert `Message` response → `MessageParam` for history |\n| `block.AsAny().(type)` | Type-switch on `ContentBlockUnion` variants |\n| `variant.JSON.Input.Raw()` | Raw JSON string of tool input (for `json.Unmarshal`) |\n| `anthropic.NewToolResultBlock(id, content, isError)` | Build `tool_result` block |\n| `anthropic.NewUserMessage(blocks...)` | Wrap tool results as a user turn |\n| `anthropic.StopReasonToolUse` | `StopReason` constant to check loop termination |\n| `anthropic.ToolUnionParam{OfTool: &t}` | Wrap `ToolParam` in the union for `Tools:` |\n\n---\n\n## Anthropic-Defined Tools\n\nVersion-suffixed struct names with `Param` suffix. `Name`/`Type` are `constant.*` types — zero value marshals correctly, so `{}` works. Wrap in `ToolUnionParam` with the matching `Of*` field. Web search and code execution are server-executed; bash and text editor are client-executed (you handle the `tool_use` locally — see `shared/tool-use-concepts.md`).\n\n```go\nTools: []anthropic.ToolUnionParam{\n    {OfWebSearchTool20260209: &anthropic.WebSearchTool20260209Param{}},\n    {OfBashTool20250124: &anthropic.ToolBash20250124Param{}},\n    {OfTextEditor20250728: &anthropic.ToolTextEditor20250728Param{}},\n    {OfCodeExecutionTool20260120: &anthropic.CodeExecutionTool20260120Param{}},\n},\n```\n\nAlso available: `WebFetchTool20260209Param`, `ToolSearchToolBm25_20251119Param`, `ToolSearchToolRegex20251119Param`. For the advisor and memory tools, use `BetaAdvisorTool20260301Param` / `BetaMemoryTool20250818Param` in the beta namespace on `client.Beta.Messages.New`.\n\n### Advisor tool (beta)\n\nServer-side — no tool_result round-trip. The advisor model must be ≥ the executor (top-level) model; invalid pairs return 400.\n\n```go\nresponse, err := client.Beta.Messages.New(ctx, anthropic.BetaMessageNewParams{\n    Model:     anthropic.ModelClaudeSonnet4_6,\n    MaxTokens: 4096,\n    Tools: []anthropic.BetaToolUnionParam{\n        {OfAdvisorTool20260301: &anthropic.BetaAdvisorTool20260301Param{\n            Model: anthropic.ModelClaudeOpus4_8,\n        }},\n    },\n    Messages: []anthropic.BetaMessageParam{ /* ... */ },\n    Betas:    []anthropic.AnthropicBeta{anthropic.AnthropicBetaAdvisorTool2026_03_01},\n})\n```\n\n---\n</doc>\n\n<doc path=\"go/managed-agents/README.md\">\n# Managed Agents — Go\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for Go. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the Go SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `agents.New` and pass it to every subsequent `sessions.New`; do not call `agents.New` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```bash\ngo get github.com/anthropics/anthropic-sdk-go\n```\n\n## Client Initialization\n\n```go\nimport (\n    \"context\"\n\n    \"github.com/anthropics/anthropic-sdk-go\"\n    \"github.com/anthropics/anthropic-sdk-go/option\"\n)\n\n// Default (uses ANTHROPIC_API_KEY env var)\nclient := anthropic.NewClient()\n\n// Explicit API key\nclient := anthropic.NewClient(\n    option.WithAPIKey(\"your-api-key\"),\n)\n\nctx := context.Background()\n```\n\n---\n\n## Create an Environment\n\n```go\nenvironment, err := client.Beta.Environments.New(ctx, anthropic.BetaEnvironmentNewParams{\n    Name: \"my-dev-env\",\n    Config: anthropic.BetaEnvironmentNewParamsConfigUnion{\n        OfCloud: &anthropic.BetaCloudConfigParams{\n            Networking: anthropic.BetaCloudConfigParamsNetworkingUnion{\n                OfUnrestricted: &anthropic.BetaUnrestrictedNetworkParam{},\n            },\n        },\n    },\n})\nif err != nil {\n    panic(err)\n}\nfmt.Println(environment.ID) // env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** `Model`/`System`/`Tools` live on the agent object, not the session. Always start with `Beta.Agents.New()` — the session only takes `Agent: anthropic.BetaSessionNewParamsAgentUnion{OfString: anthropic.String(agent.ID)}` (or the typed `OfBetaManagedAgentsAgents` variant when you need a specific version).\n\n### Minimal\n\n```go\n// 1. Create the agent (reusable, versioned)\nagent, err := client.Beta.Agents.New(ctx, anthropic.BetaAgentNewParams{\n    Name: \"Coding Assistant\",\n    Model: anthropic.BetaManagedAgentsModelConfigParams{\n        ID:   \"claude-opus-4-8\",\n        Type: anthropic.BetaManagedAgentsModelConfigParamsTypeModelConfig,\n    },\n    System: anthropic.String(\"You are a helpful coding assistant.\"),\n    Tools: []anthropic.BetaAgentNewParamsToolUnion{{\n        OfAgentToolset20260401: &anthropic.BetaManagedAgentsAgentToolset20260401Params{\n            Type: anthropic.BetaManagedAgentsAgentToolset20260401ParamsTypeAgentToolset20260401,\n        },\n    }},\n})\nif err != nil {\n    panic(err)\n}\n\n// 2. Start a session\nsession, err := client.Beta.Sessions.New(ctx, anthropic.BetaSessionNewParams{\n    Agent: anthropic.BetaSessionNewParamsAgentUnion{\n        OfBetaManagedAgentsAgents: &anthropic.BetaManagedAgentsAgentParams{\n            Type:    anthropic.BetaManagedAgentsAgentParamsTypeAgent,\n            ID:      agent.ID,\n            Version: anthropic.Int(agent.Version),\n        },\n    },\n    EnvironmentID: environment.ID,\n    Title:         anthropic.String(\"Quickstart session\"),\n})\nif err != nil {\n    panic(err)\n}\nfmt.Printf(\"Session ID: %s, status: %s\\n\", session.ID, session.Status)\nfmt.Printf(\"Trace: https://platform.claude.com/workspaces/default/sessions/%s\\n\", session.ID)\n```\n\n### Updating an Agent\n\nUpdates create new versions; the agent object is immutable per version.\n\n```go\nupdatedAgent, err := client.Beta.Agents.Update(ctx, agent.ID, anthropic.BetaAgentUpdateParams{\n    Version: agent.Version,\n    System:  anthropic.String(\"You are a helpful coding agent. Always write tests.\"),\n})\nif err != nil {\n    panic(err)\n}\nfmt.Printf(\"New version: %d\\n\", updatedAgent.Version)\n\n// List all versions\niter := client.Beta.Agents.Versions.ListAutoPaging(ctx, agent.ID, anthropic.BetaAgentVersionListParams{})\nfor iter.Next() {\n    version := iter.Current()\n    fmt.Printf(\"Version %d: %s\\n\", version.Version, version.UpdatedAt.Format(time.RFC3339))\n}\nif err := iter.Err(); err != nil {\n    panic(err)\n}\n\n// Archive the agent\n_, err = client.Beta.Agents.Archive(ctx, agent.ID, anthropic.BetaAgentArchiveParams{})\nif err != nil {\n    panic(err)\n}\n```\n\n---\n\n## Send a User Message\n\n```go\n_, err = client.Beta.Sessions.Events.Send(ctx, session.ID, anthropic.BetaSessionEventSendParams{\n    Events: []anthropic.BetaManagedAgentsEventParamsUnion{{\n        OfUserMessage: &anthropic.BetaManagedAgentsUserMessageEventParams{\n            Type: anthropic.BetaManagedAgentsUserMessageEventParamsTypeUserMessage,\n            Content: []anthropic.BetaManagedAgentsUserMessageEventParamsContentUnion{{\n                OfText: &anthropic.BetaManagedAgentsTextBlockParam{\n                    Type: anthropic.BetaManagedAgentsTextBlockTypeText,\n                    Text: \"Review the auth module\",\n                },\n            }},\n        },\n    }},\n})\nif err != nil {\n    panic(err)\n}\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n```go\n// Open the stream first, then send the user message\nstream := client.Beta.Sessions.Events.StreamEvents(ctx, session.ID, anthropic.BetaSessionEventStreamParams{})\ndefer stream.Close()\n\nif _, err := client.Beta.Sessions.Events.Send(ctx, session.ID, anthropic.BetaSessionEventSendParams{\n    Events: []anthropic.BetaManagedAgentsEventParamsUnion{{\n        OfUserMessage: &anthropic.BetaManagedAgentsUserMessageEventParams{\n            Type: anthropic.BetaManagedAgentsUserMessageEventParamsTypeUserMessage,\n            Content: []anthropic.BetaManagedAgentsUserMessageEventParamsContentUnion{{\n                OfText: &anthropic.BetaManagedAgentsTextBlockParam{\n                    Type: anthropic.BetaManagedAgentsTextBlockTypeText,\n                    Text: \"Summarize the repo README\",\n                },\n            }},\n        },\n    }},\n}); err != nil {\n    panic(err)\n}\n\nevents:\nfor stream.Next() {\n    switch event := stream.Current().AsAny().(type) {\n    case anthropic.BetaManagedAgentsAgentMessageEvent:\n        for _, block := range event.Content {\n            fmt.Print(block.Text)\n        }\n    case anthropic.BetaManagedAgentsAgentToolUseEvent:\n        fmt.Printf(\"\\n[Using tool: %s]\\n\", event.Name)\n    case anthropic.BetaManagedAgentsSessionStatusIdleEvent:\n        break events\n    case anthropic.BetaManagedAgentsSessionErrorEvent:\n        fmt.Printf(\"\\n[Error: %s]\\n\", event.Error.Message)\n        break events\n    }\n}\nif err := stream.Err(); err != nil {\n    panic(err)\n}\n```\n\n### Reconnecting and Tailing\n\nWhen reconnecting mid-session, list past events first to dedupe, then tail live events:\n\n```go\nstream := client.Beta.Sessions.Events.StreamEvents(ctx, session.ID, anthropic.BetaSessionEventStreamParams{})\ndefer stream.Close()\n\n// Stream is open and buffering. List history before tailing live.\nseenEventIDs := map[string]struct{}{}\nhistory := client.Beta.Sessions.Events.ListAutoPaging(ctx, session.ID, anthropic.BetaSessionEventListParams{})\nfor history.Next() {\n    seenEventIDs[history.Current().ID] = struct{}{}\n}\nif err := history.Err(); err != nil {\n    panic(err)\n}\n\n// Tail live events, skipping anything already seen\ntail:\nfor stream.Next() {\n    event := stream.Current()\n    if _, seen := seenEventIDs[event.ID]; seen {\n        continue\n    }\n    seenEventIDs[event.ID] = struct{}{}\n    switch event := event.AsAny().(type) {\n    case anthropic.BetaManagedAgentsAgentMessageEvent:\n        for _, block := range event.Content {\n            fmt.Print(block.Text)\n        }\n    case anthropic.BetaManagedAgentsSessionStatusIdleEvent:\n        break tail\n    }\n}\nif err := stream.Err(); err != nil {\n    panic(err)\n}\n```\n\n---\n\n## Provide Custom Tool Result\n\n> ℹ️ The Go managed-agents bindings for `user.custom_tool_result` are not yet documented in this skill or in the apps source examples. Refer to `shared/managed-agents-events.md` for the wire format and the `github.com/anthropics/anthropic-sdk-go` repository for the corresponding Go params types.\n\n---\n\n## Poll Events\n\n```go\n// Auto-paginating iterator\niter := client.Beta.Sessions.Events.ListAutoPaging(ctx, session.ID, anthropic.BetaSessionEventListParams{})\nfor iter.Next() {\n    event := iter.Current()\n    fmt.Printf(\"%s: %s\\n\", event.Type, event.ID)\n}\nif err := iter.Err(); err != nil {\n    panic(err)\n}\n```\n\n---\n\n## Upload a File\n\n```go\ncsvFile, err := os.Open(\"data.csv\")\nif err != nil {\n    panic(err)\n}\ndefer csvFile.Close()\n\nfile, err := client.Beta.Files.Upload(ctx, anthropic.BetaFileUploadParams{\n    File: csvFile,\n})\nif err != nil {\n    panic(err)\n}\nfmt.Printf(\"File ID: %s\\n\", file.ID)\n\n// Mount in a session\nsession, err := client.Beta.Sessions.New(ctx, anthropic.BetaSessionNewParams{\n    Agent: anthropic.BetaSessionNewParamsAgentUnion{\n        OfString: anthropic.String(agent.ID),\n    },\n    EnvironmentID: environment.ID,\n    Resources: []anthropic.BetaSessionNewParamsResourceUnion{{\n        OfFile: &anthropic.BetaManagedAgentsFileResourceParams{\n            Type:      anthropic.BetaManagedAgentsFileResourceParamsTypeFile,\n            FileID:    file.ID,\n            MountPath: anthropic.String(\"/workspace/data.csv\"),\n        },\n    }},\n})\nif err != nil {\n    panic(err)\n}\n```\n\n### Add and Manage Resources on an Existing Session\n\n```go\n// Attach an additional file to an open session\nresource, err := client.Beta.Sessions.Resources.Add(ctx, session.ID, anthropic.BetaSessionResourceAddParams{\n    BetaManagedAgentsFileResourceParams: anthropic.BetaManagedAgentsFileResourceParams{\n        Type:   anthropic.BetaManagedAgentsFileResourceParamsTypeFile,\n        FileID: file.ID,\n    },\n})\nif err != nil {\n    panic(err)\n}\nfmt.Println(resource.ID) // \"sesrsc_01ABC...\"\n\n// List resources on the session\nlisted, err := client.Beta.Sessions.Resources.List(ctx, session.ID, anthropic.BetaSessionResourceListParams{})\nif err != nil {\n    panic(err)\n}\nfor _, entry := range listed.Data {\n    fmt.Println(entry.ID, entry.Type)\n}\n\n// Detach a resource\nif _, err := client.Beta.Sessions.Resources.Delete(ctx, resource.ID, anthropic.BetaSessionResourceDeleteParams{\n    SessionID: session.ID,\n}); err != nil {\n    panic(err)\n}\n```\n\n---\n\n## List and Download Session Files\n\n> ℹ️ Listing and downloading files an agent wrote during a session is not yet documented for Go in this skill or in the apps source examples. See `shared/managed-agents-events.md` and the `github.com/anthropics/anthropic-sdk-go` repository for the `Beta.Files.List` and `Beta.Files.Download` Go params types.\n\n---\n\n## Session Management\n\n```go\n// List environments\nenvironments, err := client.Beta.Environments.List(ctx, anthropic.BetaEnvironmentListParams{})\nif err != nil {\n    panic(err)\n}\n\n// Retrieve a specific environment\nenv, err := client.Beta.Environments.Get(ctx, environment.ID, anthropic.BetaEnvironmentGetParams{})\nif err != nil {\n    panic(err)\n}\n\n// Archive an environment (read-only, existing sessions continue)\n_, err = client.Beta.Environments.Archive(ctx, environment.ID, anthropic.BetaEnvironmentArchiveParams{})\nif err != nil {\n    panic(err)\n}\n\n// Delete an environment (only if no sessions reference it)\n_, err = client.Beta.Environments.Delete(ctx, environment.ID, anthropic.BetaEnvironmentDeleteParams{})\nif err != nil {\n    panic(err)\n}\n\n// Delete a session\n_, err = client.Beta.Sessions.Delete(ctx, session.ID, anthropic.BetaSessionDeleteParams{})\nif err != nil {\n    panic(err)\n}\n```\n\n---\n\n## MCP Server Integration\n\n```go\n// Agent declares MCP server (no auth here — auth goes in a vault)\nagent, err := client.Beta.Agents.New(ctx, anthropic.BetaAgentNewParams{\n    Name: \"GitHub Assistant\",\n    Model: anthropic.BetaManagedAgentsModelConfigParams{\n        ID:   \"claude-opus-4-8\",\n        Type: anthropic.BetaManagedAgentsModelConfigParamsTypeModelConfig,\n    },\n    MCPServers: []anthropic.BetaManagedAgentsURLMCPServerParams{{\n        Type: anthropic.BetaManagedAgentsURLMCPServerParamsTypeURL,\n        Name: \"github\",\n        URL:  \"https://api.githubcopilot.com/mcp/\",\n    }},\n    Tools: []anthropic.BetaAgentNewParamsToolUnion{\n        {\n            OfAgentToolset20260401: &anthropic.BetaManagedAgentsAgentToolset20260401Params{\n                Type: anthropic.BetaManagedAgentsAgentToolset20260401ParamsTypeAgentToolset20260401,\n            },\n        },\n        {\n            OfMCPToolset: &anthropic.BetaManagedAgentsMCPToolsetParams{\n                Type:          anthropic.BetaManagedAgentsMCPToolsetParamsTypeMCPToolset,\n                MCPServerName: \"github\",\n            },\n        },\n    },\n})\nif err != nil {\n    panic(err)\n}\n\n// Session attaches vault(s) containing credentials for those MCP server URLs\nsession, err := client.Beta.Sessions.New(ctx, anthropic.BetaSessionNewParams{\n    Agent: anthropic.BetaSessionNewParamsAgentUnion{\n        OfBetaManagedAgentsAgents: &anthropic.BetaManagedAgentsAgentParams{\n            Type:    anthropic.BetaManagedAgentsAgentParamsTypeAgent,\n            ID:      agent.ID,\n            Version: anthropic.Int(agent.Version),\n        },\n    },\n    EnvironmentID: environment.ID,\n    VaultIDs:      []string{vault.ID},\n})\nif err != nil {\n    panic(err)\n}\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n\n---\n\n## Vaults\n\n```go\n// Create a vault\nvault, err := client.Beta.Vaults.New(ctx, anthropic.BetaVaultNewParams{\n    DisplayName: \"Alice\",\n    Metadata:    map[string]string{\"external_user_id\": \"usr_abc123\"},\n})\nif err != nil {\n    panic(err)\n}\n\n// Add an OAuth credential\ncredential, err := client.Beta.Vaults.Credentials.New(ctx, vault.ID, anthropic.BetaVaultCredentialNewParams{\n    DisplayName: anthropic.String(\"Alice's Slack\"),\n    Auth: anthropic.BetaVaultCredentialNewParamsAuthUnion{\n        OfMCPOAuth: &anthropic.BetaManagedAgentsMCPOAuthCreateParams{\n            Type:         anthropic.BetaManagedAgentsMCPOAuthCreateParamsTypeMCPOAuth,\n            MCPServerURL: \"https://mcp.slack.com/mcp\",\n            AccessToken:  \"xoxp-...\",\n            ExpiresAt:    anthropic.Time(time.Date(2026, time.April, 15, 0, 0, 0, 0, time.UTC)),\n            Refresh: anthropic.BetaManagedAgentsMCPOAuthRefreshParams{\n                TokenEndpoint: \"https://slack.com/api/oauth.v2.access\",\n                ClientID:      \"1234567890.0987654321\",\n                Scope:         anthropic.String(\"channels:read chat:write\"),\n                RefreshToken:  \"xoxe-1-...\",\n                TokenEndpointAuth: anthropic.BetaManagedAgentsMCPOAuthRefreshParamsTokenEndpointAuthUnion{\n                    OfClientSecretPost: &anthropic.BetaManagedAgentsTokenEndpointAuthPostParam{\n                        Type:         anthropic.BetaManagedAgentsTokenEndpointAuthPostParamTypeClientSecretPost,\n                        ClientSecret: \"abc123...\",\n                    },\n                },\n            },\n        },\n    },\n})\nif err != nil {\n    panic(err)\n}\n\n// Rotate the credential (e.g., after a token refresh)\n_, err = client.Beta.Vaults.Credentials.Update(ctx, credential.ID, anthropic.BetaVaultCredentialUpdateParams{\n    VaultID: vault.ID,\n    Auth: anthropic.BetaVaultCredentialUpdateParamsAuthUnion{\n        OfMCPOAuth: &anthropic.BetaManagedAgentsMCPOAuthUpdateParams{\n            Type:        anthropic.BetaManagedAgentsMCPOAuthUpdateParamsTypeMCPOAuth,\n            AccessToken: anthropic.String(\"xoxp-new-...\"),\n            ExpiresAt:   anthropic.Time(time.Date(2026, time.May, 15, 0, 0, 0, 0, time.UTC)),\n            Refresh: anthropic.BetaManagedAgentsMCPOAuthRefreshUpdateParams{\n                RefreshToken: anthropic.String(\"xoxe-1-new-...\"),\n            },\n        },\n    },\n})\nif err != nil {\n    panic(err)\n}\n\n// Archive a vault\n_, err = client.Beta.Vaults.Archive(ctx, vault.ID, anthropic.BetaVaultArchiveParams{})\nif err != nil {\n    panic(err)\n}\n```\n\n---\n\n## GitHub Repository Integration\n\nMount a GitHub repository as a session resource (a vault holds the GitHub MCP credential):\n\n```go\nsession, err := client.Beta.Sessions.New(ctx, anthropic.BetaSessionNewParams{\n    Agent:         anthropic.BetaSessionNewParamsAgentUnion{OfString: anthropic.String(agent.ID)},\n    EnvironmentID: environment.ID,\n    VaultIDs:      []string{vault.ID},\n    Resources: []anthropic.BetaSessionNewParamsResourceUnion{\n        {\n            OfGitHubRepository: &anthropic.BetaManagedAgentsGitHubRepositoryResourceParams{\n                Type:               anthropic.BetaManagedAgentsGitHubRepositoryResourceParamsTypeGitHubRepository,\n                URL:                \"https://github.com/org/repo\",\n                MountPath:          anthropic.String(\"/workspace/repo\"),\n                AuthorizationToken: \"ghp_your_github_token\",\n            },\n        },\n    },\n})\nif err != nil {\n    panic(err)\n}\n```\n\nMultiple repositories on the same session:\n\n```go\nresources := []anthropic.BetaSessionNewParamsResourceUnion{\n    {\n        OfGitHubRepository: &anthropic.BetaManagedAgentsGitHubRepositoryResourceParams{\n            Type:               anthropic.BetaManagedAgentsGitHubRepositoryResourceParamsTypeGitHubRepository,\n            URL:                \"https://github.com/org/frontend\",\n            MountPath:          anthropic.String(\"/workspace/frontend\"),\n            AuthorizationToken: \"ghp_your_github_token\",\n        },\n    },\n    {\n        OfGitHubRepository: &anthropic.BetaManagedAgentsGitHubRepositoryResourceParams{\n            Type:               anthropic.BetaManagedAgentsGitHubRepositoryResourceParamsTypeGitHubRepository,\n            URL:                \"https://github.com/org/backend\",\n            MountPath:          anthropic.String(\"/workspace/backend\"),\n            AuthorizationToken: \"ghp_your_github_token\",\n        },\n    },\n}\n```\n\nRotating a repository's authorization token:\n\n```go\nlisted, err := client.Beta.Sessions.Resources.List(ctx, session.ID, anthropic.BetaSessionResourceListParams{})\nif err != nil {\n    panic(err)\n}\nrepoResourceID := listed.Data[0].ID\n\n_, err = client.Beta.Sessions.Resources.Update(ctx, repoResourceID, anthropic.BetaSessionResourceUpdateParams{\n    SessionID:          session.ID,\n    AuthorizationToken: \"ghp_your_new_github_token\",\n})\nif err != nil {\n    panic(err)\n}\n```\n</doc>\n\n<doc path=\"java/claude-api/README.md\">\n# Claude API — Java\n\n> **Note:** The Java SDK supports the Claude API and beta tool use with annotated classes. Agent SDK is not yet available for Java.\n\n## Package Reference\n\nTypes are organized by package. If a class you need isn't shown in an example below, locate it via this table first — don't block on fetching SDK source over the network.\n\n| `import` prefix | Contains |\n|---|---|\n| `com.anthropic.client` / `com.anthropic.client.okhttp` | `AnthropicClient`, `AnthropicOkHttpClient` |\n| `com.anthropic.models.messages` | non-beta request/response types — `MessageCreateParams`, `Model`, `Message`, `TextBlockParam`, `ContentBlockParam`, `ToolUseBlockParam`, `ToolResultBlockParam`, `CacheControlEphemeral`, `Tool*` (e.g. `ToolBash20250124`, `ToolTextEditor20250728`), `StopReason`, `StructuredMessage*` |\n| `com.anthropic.models.messages.batches` | Batch API — `BatchResultsParams`, `MessageBatchIndividualResponse` |\n| `com.anthropic.models.beta` | `AnthropicBeta` (beta-flag constants) |\n| `com.anthropic.models.beta.messages` | beta-endpoint types — `MessageCreateParams`, `BetaMessage`, `BetaStopReason`, `BetaContextManagementConfig`, `BetaMcpToolset`, `BetaRequestMcpServerUrlDefinition`, `BetaTool*` |\n| `com.anthropic.core` | `JsonValue`, `JsonField`, `JsonSchemaLocalValidation`, `com.anthropic.core.http.StreamResponse` |\n| `com.anthropic.errors` | typed exceptions — `AnthropicServiceException`, `RateLimitException`, `NotFoundException`, etc. (see `shared/error-codes.md`) |\n\n`client.messages()` uses `com.anthropic.models.messages.*`; `client.beta().messages()` uses `com.anthropic.models.beta.messages.*`. Both packages define a `MessageCreateParams` — import the one matching the client path you call.\n\n### Key types per feature\n\nWrite from this table instead of `javap`/jar inspection. Endpoint column tells you whether to use `client.messages()` or `client.beta().messages()`.\n\n| Feature | Endpoint | Key Java types / builder calls |\n|---|---|---|\n| User profiles | beta | `client.beta().userProfiles().create(...)` / `.retrieve(id)` / `.list()`. Pass the returned profile id on the beta `MessageCreateParams`. Requires a beta header — check the SDK's beta-headers reference for the current flag. |\n| Agent Skills | beta | `BetaContainerParams`, `BetaSkillParams`, `BetaCodeExecutionTool20250825`. `.addBeta(\"code-execution-2025-08-25\").addBeta(\"skills-2025-10-02\")`. Download the output via `client.beta().files().download(fileId)`. |\n| Cache diagnostics | beta | `BetaDiagnosticsParam`, `BetaCacheControlEphemeral` |\n| Context editing | beta | `.contextManagement(BetaContextManagementConfig.builder()…)`. The edit strategy is a `BetaClearToolUses20250919Edit` (or `BetaClearThinking20251015Edit`); its trigger is a `BetaInputTokensTrigger` built separately and passed to the edit's builder — there is no direct `.inputTokensTrigger(N)` shortcut on the edit builder. `javap` the edit and trigger classes for the exact setter names. |\n| Memory tool | non-beta | `.addTool(MemoryTool20250818.builder().build())` from `com.anthropic.models.messages` |\n| Programmatic tool calling | non-beta | `CodeExecutionTool20260120`, `Tool`, `ContentBlockParam` |\n| Strict tool use | non-beta | `Tool`, `Tool.InputSchema` |\n| Task budgets | beta | `.outputConfig(BetaOutputConfig.builder().taskBudget(BetaTokenTaskBudget.builder()...))` |\n| Tool search | non-beta | `.addTool(ToolSearchToolRegex20251119.builder()...)` from `com.anthropic.models.messages` |\n| Web search | non-beta | `WebSearchTool20260209` from `com.anthropic.models.messages` — the latest variant with dynamic filtering (Opus 4.8/4.7/4.6 + Sonnet 4.6). For older models or Vertex, use `WebSearchTool20250305` |\n\n### Discovering type and member names\n\nIf a class or builder method you need isn't in the tables above, `jar tf <anthropic-java-core jar> | grep -i <term>` or `javap -classpath <jar> com.anthropic.models.…` is fast enough to locate names. **Do not compile and run a separate reflection program** to enumerate members — the first build is slow enough to be backgrounded in many environments, trapping you in a polling loop. Write the script with the names you found and let the compiler error (`cannot find symbol`) point at any wrong member.\n\n## Installation\n\nMaven:\n\n```xml\n<dependency>\n    <groupId>com.anthropic</groupId>\n    <artifactId>anthropic-java</artifactId>\n    <version>2.34.0</version>\n</dependency>\n```\n\nGradle:\n\n```groovy\nimplementation(\"com.anthropic:anthropic-java:2.34.0\")\n```\n\n## Client Initialization\n\n```java\nimport com.anthropic.client.AnthropicClient;\nimport com.anthropic.client.okhttp.AnthropicOkHttpClient;\n\n// Default (reads ANTHROPIC_API_KEY from environment)\nAnthropicClient client = AnthropicOkHttpClient.fromEnv();\n\n// Explicit API key\nAnthropicClient client = AnthropicOkHttpClient.builder()\n    .apiKey(\"your-api-key\")\n    .build();\n```\n\n---\n\n## Basic Message Request\n\n```java\nimport com.anthropic.models.messages.MessageCreateParams;\nimport com.anthropic.models.messages.Message;\nimport com.anthropic.models.messages.Model;\n\nMessageCreateParams params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_OPUS_4_8)\n    .maxTokens(16000L)\n    .addUserMessage(\"What is the capital of France?\")\n    .build();\n\nMessage response = client.messages().create(params);\nresponse.content().stream()\n    .flatMap(block -> block.text().stream())\n    .forEach(textBlock -> System.out.println(textBlock.text()));\n```\n\n---\n\n## Thinking\n\n**Adaptive thinking is the recommended mode for Claude 4.6+ models.** Claude decides dynamically when and how much to think. The builder has a direct `.thinking(ThinkingConfigAdaptive)` overload — no manual union wrapping.\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking (below). `ThinkingConfigEnabled.builder().budgetTokens(N)` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `.thinking(ThinkingConfigEnabled.builder().budgetTokens(N).build())` (budget must be < `maxTokens`, min 1024).\n\n```java\nimport com.anthropic.models.messages.ContentBlock;\nimport com.anthropic.models.messages.MessageCreateParams;\nimport com.anthropic.models.messages.Model;\nimport com.anthropic.models.messages.ThinkingConfigAdaptive;\n\nMessageCreateParams params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_SONNET_4_6)\n    .maxTokens(16000L)\n    .thinking(ThinkingConfigAdaptive.builder().build())\n    .addUserMessage(\"Solve this step by step: 27 * 453\")\n    .build();\n\nfor (ContentBlock block : client.messages().create(params).content()) {\n    block.thinking().ifPresent(t -> System.out.println(\"[thinking] \" + t.thinking()));\n    block.text().ifPresent(t -> System.out.println(t.text()));\n}\n```\n\n`ContentBlock` narrowing: `.thinking()` / `.text()` return `Optional<T>` — use `.ifPresent(...)` or `.stream().flatMap(...)`. Alternative: `isThinking()` / `asThinking()` boolean+unwrap pairs (throws on wrong variant).\n\n---\n\n## Effort Parameter\n\nEffort is nested inside `OutputConfig` — there is NO `.effort()` directly on `MessageCreateParams.Builder`.\n\n```java\nimport com.anthropic.models.messages.OutputConfig;\n\n.outputConfig(OutputConfig.builder()\n    .effort(OutputConfig.Effort.HIGH)  // or LOW, MEDIUM, MAX\n    .build())\n```\n\nCombine with `Thinking = ThinkingConfigAdaptive` for cost-quality control.\n\n---\n\n## Prompt Caching\n\nSystem message as a list of `TextBlockParam` with `CacheControlEphemeral`. Use `.systemOfTextBlockParams(...)` — the plain `.system(String)` overload can't carry cache control. For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.\n\n```java\nimport com.anthropic.models.messages.TextBlockParam;\nimport com.anthropic.models.messages.CacheControlEphemeral;\n\n.systemOfTextBlockParams(List.of(\n    TextBlockParam.builder()\n        .text(longSystemPrompt)\n        .cacheControl(CacheControlEphemeral.builder()\n            .ttl(CacheControlEphemeral.Ttl.TTL_1H)  // optional; also TTL_5M\n            .build())\n        .build()))\n```\n\nThere's also a top-level `.cacheControl(CacheControlEphemeral)` on `MessageCreateParams.Builder` and on `Tool.builder()`.\n\nVerify hits via `response.usage().cacheCreationInputTokens()` / `response.usage().cacheReadInputTokens()`.\n\n---\n\n## Token Counting\n\n```java\nimport com.anthropic.models.messages.MessageCountTokensParams;\n\nlong tokens = client.messages().countTokens(\n    MessageCountTokensParams.builder()\n        .model(Model.CLAUDE_SONNET_4_6)\n        .addUserMessage(\"Hello\")\n        .build()\n).inputTokens();\n```\n\n---\n\n## PDF / Document Input\n\n`DocumentBlockParam` builder has source shortcuts. Wrap in `ContentBlockParam.ofDocument()` and pass via `.addUserMessageOfBlockParams()`.\n\n```java\nimport com.anthropic.models.messages.DocumentBlockParam;\nimport com.anthropic.models.messages.ContentBlockParam;\nimport com.anthropic.models.messages.TextBlockParam;\n\nDocumentBlockParam doc = DocumentBlockParam.builder()\n    .source(Base64PdfSource.builder().data(base64String).build())\n    // or .source(UrlPdfSource.builder().url(\"https://...\").build())\n    .title(\"My Document\")        // optional\n    .build();\n```\n\nFor **Files API** document references, use the beta path and beta types — see `files-api.md`: `BetaRequestDocumentBlock.builder().source(BetaFileDocumentSource.builder().fileId(id).build())`.\n\n```java\n.addUserMessageOfBlockParams(List.of(\n    ContentBlockParam.ofDocument(doc),\n    ContentBlockParam.ofText(TextBlockParam.builder().text(\"Summarize this\").build())))\n```\n\n---\n\n## Stop Details\n\nWhen `stopReason()` is `\"refusal\"`, the response includes structured `stopDetails()`:\n\n```java\nresponse.stopDetails().ifPresent(details -> {\n    System.out.println(\"Category: \" + details.category());\n    System.out.println(\"Explanation: \" + details.explanation());\n});\n```\n\n**Refusal fallbacks (Claude Fable 5) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. New `claude-fable-5` code should include the server-side `fallbacks` parameter (beta header `server-side-fallback-2026-06-01`, fallback model `claude-opus-4-8`, on the beta messages call) by default. The exact Java builder methods (and the client-side middleware for providers without server-side support) are not documented here — WebFetch the Java SDK repo's `examples/` from `shared/live-sources.md`; full semantics in `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Error Type\n\n`AnthropicServiceException` exposes `.errorType()` returning `Optional<ErrorType>` for programmatic error classification:\n\n```java\ntry {\n    client.messages().create(params);\n} catch (AnthropicServiceException e) {\n    e.errorType().ifPresent(type ->\n        System.out.println(\"Error type: \" + type)  // RATE_LIMIT_ERROR, OVERLOADED_ERROR, etc.\n    );\n}\n```\n\n---\n</doc>\n\n<doc path=\"java/claude-api/files-api.md\">\n# Files API — Java\n\n## Files API (Beta)\n\nUnder `client.beta().files()`. File references in messages need the beta message types (non-beta `DocumentBlockParam.Source` has no file-ID variant).\n\n```java\nimport com.anthropic.models.beta.files.FileUploadParams;\nimport com.anthropic.models.beta.files.FileMetadata;\nimport com.anthropic.models.beta.messages.BetaRequestDocumentBlock;\nimport com.anthropic.models.beta.messages.BetaFileDocumentSource;\nimport java.nio.file.Paths;\n\nFileMetadata meta = client.beta().files().upload(\n    FileUploadParams.builder()\n        .file(Paths.get(\"/path/to/doc.pdf\"))  // or .file(InputStream) or .file(byte[])\n        .build());\n\n// Reference in a beta message:\nBetaRequestDocumentBlock doc = BetaRequestDocumentBlock.builder()\n    .source(BetaFileDocumentSource.builder().fileId(meta.id()).build())\n    .build();\n```\n\nOther methods: `.list()`, `.delete(String fileId)`, `.download(String fileId)`, `.retrieveMetadata(String fileId)`.\n</doc>\n\n<doc path=\"java/claude-api/streaming.md\">\n# Streaming — Java\n\n## Streaming\n\n```java\nimport com.anthropic.core.http.StreamResponse;\nimport com.anthropic.models.messages.RawMessageStreamEvent;\n\nMessageCreateParams params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_OPUS_4_8)\n    .maxTokens(64000L)\n    .addUserMessage(\"Write a haiku\")\n    .build();\n\ntry (StreamResponse<RawMessageStreamEvent> streamResponse = client.messages().createStreaming(params)) {\n    streamResponse.stream()\n        .flatMap(event -> event.contentBlockDelta().stream())\n        .flatMap(deltaEvent -> deltaEvent.delta().text().stream())\n        .forEach(textDelta -> System.out.print(textDelta.text()));\n}\n```\n\n---\n</doc>\n\n<doc path=\"java/claude-api/tool-use.md\">\n# Tool Use — Java\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Use (Beta)\n\nThe Java SDK supports beta tool use with annotated classes. Tool classes implement `Supplier<String>` for automatic execution via `BetaToolRunner`.\n\n### Tool Runner (automatic loop)\n\n```java\nimport com.anthropic.models.beta.messages.MessageCreateParams;\nimport com.anthropic.models.beta.messages.BetaMessage;\nimport com.anthropic.helpers.BetaToolRunner;\nimport com.fasterxml.jackson.annotation.JsonClassDescription;\nimport com.fasterxml.jackson.annotation.JsonPropertyDescription;\nimport java.util.function.Supplier;\n\n@JsonClassDescription(\"Get the weather in a given location\")\nstatic class GetWeather implements Supplier<String> {\n    @JsonPropertyDescription(\"The city and state, e.g. San Francisco, CA\")\n    public String location;\n\n    @Override\n    public String get() {\n        return \"The weather in \" + location + \" is sunny and 72°F\";\n    }\n}\n\nBetaToolRunner toolRunner = client.beta().messages().toolRunner(\n    MessageCreateParams.builder()\n        .model(\"claude-opus-4-8\")\n        .maxTokens(16000L)\n        .putAdditionalHeader(\"anthropic-beta\", \"structured-outputs-2025-11-13\")\n        .addTool(GetWeather.class)\n        .addUserMessage(\"What's the weather in San Francisco?\")\n        .build());\n\nfor (BetaMessage message : toolRunner) {\n    System.out.println(message);\n}\n```\n\n### Memory Tool\n\nThe Java SDK provides `BetaMemoryToolHandler` for implementing the memory tool backend. You supply a handler that manages file storage, and the `BetaToolRunner` handles memory tool calls automatically.\n\n```java\nimport com.anthropic.helpers.BetaMemoryToolHandler;\nimport com.anthropic.helpers.BetaToolRunner;\nimport com.anthropic.models.beta.messages.BetaMemoryTool20250818;\nimport com.anthropic.models.beta.messages.BetaMessage;\nimport com.anthropic.models.beta.messages.MessageCreateParams;\nimport com.anthropic.models.beta.messages.ToolRunnerCreateParams;\n\n// Implement BetaMemoryToolHandler with your storage backend (e.g., filesystem)\nBetaMemoryToolHandler memoryHandler = new FileSystemMemoryToolHandler(sandboxRoot);\n\nMessageCreateParams createParams = MessageCreateParams.builder()\n    .model(\"claude-opus-4-8\")\n    .maxTokens(4096L)\n    .addTool(BetaMemoryTool20250818.builder().build())\n    .addUserMessage(\"Remember that my favorite color is blue\")\n    .build();\n\nBetaToolRunner toolRunner = client.beta().messages().toolRunner(\n    ToolRunnerCreateParams.builder()\n        .betaMemoryToolHandler(memoryHandler)\n        .initialMessageParams(createParams)\n        .build());\n\nfor (BetaMessage message : toolRunner) {\n    System.out.println(message);\n}\n```\n\nSee the [shared memory tool concepts](../../shared/tool-use-concepts.md) for more details on the memory tool.\n\n### Non-Beta Tool Declaration (manual JSON schema)\n\n`Tool.InputSchema.Properties` is a freeform `Map<String, JsonValue>` wrapper — build property schemas via `putAdditionalProperty`. `type: \"object\"` is the default. The builder has a direct `.addTool(Tool)` overload that wraps in `ToolUnion` automatically.\n\n```java\nimport com.anthropic.core.JsonValue;\nimport com.anthropic.models.messages.Tool;\n\nTool tool = Tool.builder()\n    .name(\"get_weather\")\n    .description(\"Get the current weather in a given location\")\n    .inputSchema(Tool.InputSchema.builder()\n        .properties(Tool.InputSchema.Properties.builder()\n            .putAdditionalProperty(\"location\", JsonValue.from(Map.of(\"type\", \"string\")))\n            .build())\n        .required(List.of(\"location\"))\n        .build())\n    .build();\n\nMessageCreateParams params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_SONNET_4_6)\n    .maxTokens(16000L)\n    .addTool(tool)\n    .addUserMessage(\"Weather in Paris?\")\n    .build();\n```\n\nFor manual tool loops, handle `tool_use` blocks in the response, send `tool_result` back, loop until `stop_reason` is `\"end_turn\"`. See [shared tool use concepts](../../shared/tool-use-concepts.md).\n\n### Building `MessageParam` with Content Blocks (Tool Result Round-Trip)\n\n`MessageParam.Content` is an inner union class (string | list). Use the builder's `.contentOfBlockParams(List<ContentBlockParam>)` alias — there is NO separate `MessageParamContent` class with a static `ofBlockParams`:\n\n```java\nimport com.anthropic.models.messages.MessageParam;\nimport com.anthropic.models.messages.ContentBlockParam;\nimport com.anthropic.models.messages.ToolResultBlockParam;\n\nList<ContentBlockParam> results = List.of(\n    ContentBlockParam.ofToolResult(ToolResultBlockParam.builder()\n        .toolUseId(toolUseBlock.id())\n        .content(yourResultString)\n        .build())\n);\n\nMessageParam toolResultMsg = MessageParam.builder()\n    .role(MessageParam.Role.USER)\n    .contentOfBlockParams(results)   // builder alias for Content.ofBlockParams(...)\n    .build();\n```\n\n---\n\n## Structured Output\n\nThe class-based overload auto-derives the JSON schema from your POJO and gives you a typed `.text()` return — no manual schema, no manual parsing.\n\n```java\nimport com.anthropic.models.messages.StructuredMessageCreateParams;\n\nrecord Book(String title, String author) {}\nrecord BookList(List<Book> books) {}\n\nStructuredMessageCreateParams<BookList> params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_SONNET_4_6)\n    .maxTokens(16000L)\n    .outputConfig(BookList.class)  // returns a typed builder\n    .addUserMessage(\"List 3 classic novels\")\n    .build();\n\nclient.messages().create(params).content().stream()\n    .flatMap(cb -> cb.text().stream())\n    .forEach(typed -> {\n        // typed.text() returns BookList, not String\n        for (Book b : typed.text().books()) System.out.println(b.title());\n    });\n```\n\nSupports Jackson annotations: `@JsonPropertyDescription`, `@JsonIgnore`, `@ArraySchema(minItems=...)`. Manual schema path: `OutputConfig.builder().format(JsonOutputFormat.builder().schema(...).build())`.\n\n---\n\n## Anthropic-Defined Tools\n\nVersion-suffixed types; `name`/`type` auto-set by builder. Direct `.addTool()` overloads exist for most tool types; where one is missing (newer or less-common tools — see the advisor note below), wrap via the union type's static factory: `.addTool(BetaToolUnion.of<ToolName>(builder…build()))`. Web search and code execution are server-executed; bash and text editor are client-executed (you handle the `tool_use` locally — see `shared/tool-use-concepts.md`).\n\n```java\nimport com.anthropic.models.messages.WebSearchTool20260209;\nimport com.anthropic.models.messages.ToolBash20250124;\nimport com.anthropic.models.messages.ToolTextEditor20250728;\nimport com.anthropic.models.messages.CodeExecutionTool20260120;\n\n.addTool(WebSearchTool20260209.builder()\n    .maxUses(5L)                              // optional\n    .allowedDomains(List.of(\"example.com\"))   // optional\n    .build())\n.addTool(ToolBash20250124.builder().build())\n.addTool(ToolTextEditor20250728.builder().build())\n.addTool(CodeExecutionTool20260120.builder().build())\n```\n\nAlso available: `WebFetchTool20260209`, `MemoryTool20250818`, `ToolSearchToolBm25_20251119`. For the advisor tool, use `BetaAdvisorTool20260301` in the beta namespace with `.addBeta(\"advisor-tool-2026-03-01\")` (server-side; advisor model ≥ executor model). There is no direct `.addTool(BetaAdvisorTool20260301)` overload on the beta builder — wrap it via the `BetaToolUnion` static factory for the advisor type; if `javac` rejects the specific factory method name, `javap com.anthropic.models.beta.messages.BetaToolUnion | grep -i advisor` shows the exact one.\n\n### Beta namespace (MCP, compaction)\n\nFor beta-only features use `com.anthropic.models.beta.messages.*` — class names have a `Beta` prefix AND live in the beta package. The beta `MessageCreateParams.Builder` has direct `.addTool(BetaToolBash20250124)` overloads AND `.addMcpServer()`:\n\n```java\nimport com.anthropic.models.beta.messages.MessageCreateParams;\nimport com.anthropic.models.beta.messages.BetaToolBash20250124;\nimport com.anthropic.models.beta.messages.BetaCodeExecutionTool20260120;\nimport com.anthropic.models.beta.messages.BetaRequestMcpServerUrlDefinition;\n\nMessageCreateParams params = MessageCreateParams.builder()\n    .model(Model.CLAUDE_OPUS_4_8)\n    .maxTokens(16000L)\n    .addBeta(\"mcp-client-2025-11-20\")\n    .addTool(BetaToolBash20250124.builder().build())\n    .addTool(BetaCodeExecutionTool20260120.builder().build())\n    .addMcpServer(BetaRequestMcpServerUrlDefinition.builder()\n        .name(\"my-server\")\n        .url(\"https://example.com/mcp\")\n        .build())\n    .addUserMessage(\"...\")\n    .build();\n\nclient.beta().messages().create(params);\n```\n\n`BetaTool*` types are NOT interchangeable with non-beta `Tool*` — pick one namespace per request.\n\n**Reading server-tool blocks in the response:** `ServerToolUseBlock` has `.id()`, `.name()` (enum), and `._input()` returning raw `JsonValue` — there is NO typed `.input()`. For code execution results, unwrap two levels:\n\n```java\nfor (ContentBlock block : response.content()) {\n    block.serverToolUse().ifPresent(stu -> {\n        System.out.println(\"tool: \" + stu.name() + \" input: \" + stu._input());\n    });\n    block.codeExecutionToolResult().ifPresent(r -> {\n        r.content().resultBlock().ifPresent(result -> {\n            System.out.println(\"stdout: \" + result.stdout());\n            System.out.println(\"stderr: \" + result.stderr());\n            System.out.println(\"exit: \" + result.returnCode());\n        });\n    });\n}\n```\n\n---\n</doc>\n\n<doc path=\"java/managed-agents/README.md\">\n# Managed Agents — Java\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for Java. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the Java SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `client.beta().agents().create` and pass it to every subsequent `client.beta().sessions().create`; do not call `agents().create` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```xml\n<dependency>\n    <groupId>com.anthropic</groupId>\n    <artifactId>anthropic-java</artifactId>\n</dependency>\n```\n\n## Client Initialization\n\n```java\nimport com.anthropic.client.okhttp.AnthropicOkHttpClient;\n\n// Default (uses ANTHROPIC_API_KEY env var)\nvar client = AnthropicOkHttpClient.fromEnv();\n```\n\n---\n\n## Create an Environment\n\n```java\nimport com.anthropic.models.beta.environments.BetaCloudConfigParams;\nimport com.anthropic.models.beta.environments.BetaUnrestrictedNetwork;\nimport com.anthropic.models.beta.environments.EnvironmentCreateParams;\n\nvar environment = client.beta().environments().create(EnvironmentCreateParams.builder()\n    .name(\"my-dev-env\")\n    .config(BetaCloudConfigParams.builder()\n        .networking(BetaUnrestrictedNetwork.builder().build())\n        .build())\n    .build());\nSystem.out.println(\"Environment ID: \" + environment.id()); // env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** Model, system, and tools live on the agent object, not the session. Always start with `client.beta().agents().create()` — the session takes either `.agent(agent.id())` or the typed `BetaManagedAgentsAgentParams.builder()...build()`.\n\n### Minimal\n\n```java\nimport com.anthropic.models.beta.agents.AgentCreateParams;\nimport com.anthropic.models.beta.agents.BetaManagedAgentsAgentToolset20260401Params;\nimport com.anthropic.models.beta.sessions.BetaManagedAgentsAgentParams;\nimport com.anthropic.models.beta.sessions.SessionCreateParams;\n\n// 1. Create the agent (reusable, versioned)\nvar agent = client.beta().agents().create(AgentCreateParams.builder()\n    .name(\"Coding Assistant\")\n    .model(\"claude-opus-4-8\")\n    .system(\"You are a helpful coding assistant.\")\n    .addTool(BetaManagedAgentsAgentToolset20260401Params.builder()\n        .type(BetaManagedAgentsAgentToolset20260401Params.Type.AGENT_TOOLSET_20260401)\n        .build())\n    .build());\n\n// 2. Start a session\nvar session = client.beta().sessions().create(SessionCreateParams.builder()\n    .agent(BetaManagedAgentsAgentParams.builder()\n        .type(BetaManagedAgentsAgentParams.Type.AGENT)\n        .id(agent.id())\n        .version(agent.version())\n        .build())\n    .environmentId(environment.id())\n    .title(\"Quickstart session\")\n    .build());\nSystem.out.println(\"Session ID: \" + session.id());\nSystem.out.println(\"Trace: https://platform.claude.com/workspaces/default/sessions/\" + session.id());\n```\n\n### Updating an Agent\n\nUpdates create new versions; the agent object is immutable per version.\n\n```java\nimport com.anthropic.models.beta.agents.AgentUpdateParams;\n\nvar updatedAgent = client.beta().agents().update(agent.id(), AgentUpdateParams.builder()\n    .version(agent.version())\n    .system(\"You are a helpful coding agent. Always write tests.\")\n    .build());\nSystem.out.println(\"New version: \" + updatedAgent.version());\n\n// List all versions\nfor (var version : client.beta().agents().versions().list(agent.id()).autoPager()) {\n    System.out.println(\"Version \" + version.version() + \": \" + version.updatedAt());\n}\n\n// Archive the agent\nvar archived = client.beta().agents().archive(agent.id());\nSystem.out.println(\"Archived at: \" + archived.archivedAt().orElseThrow());\n```\n\n---\n\n## Send a User Message\n\n```java\nimport com.anthropic.models.beta.sessions.events.BetaManagedAgentsUserMessageEventParams;\nimport com.anthropic.models.beta.sessions.events.EventSendParams;\n\nclient.beta().sessions().events().send(session.id(), EventSendParams.builder()\n    .addEvent(BetaManagedAgentsUserMessageEventParams.builder()\n        .type(BetaManagedAgentsUserMessageEventParams.Type.USER_MESSAGE)\n        .addTextContent(\"Review the auth module\")\n        .build())\n    .build());\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n```java\nimport com.anthropic.models.beta.sessions.events.StreamEvents;\n\n// Open the stream first, then send the user message\ntry (var stream = client.beta().sessions().events().streamStreaming(session.id())) {\n    client.beta().sessions().events().send(session.id(), EventSendParams.builder()\n        .addEvent(BetaManagedAgentsUserMessageEventParams.builder()\n            .type(BetaManagedAgentsUserMessageEventParams.Type.USER_MESSAGE)\n            .addTextContent(\"Summarize the repo README\")\n            .build())\n        .build());\n\n    for (var event : (Iterable<StreamEvents>) stream.stream()::iterator) {\n        if (event.isAgentMessage()) {\n            event.asAgentMessage().content().forEach(block -> System.out.print(block.text()));\n        } else if (event.isAgentToolUse()) {\n            System.out.println(\"\\n[Using tool: \" + event.asAgentToolUse().name() + \"]\");\n        } else if (event.isSessionStatusIdle()) {\n            break;\n        } else if (event.isSessionError()) {\n            System.out.println(\"\\n[Error]\");\n            break;\n        }\n    }\n}\n```\n\n### Reconnecting and Tailing\n\nWhen reconnecting mid-session, list past events first to dedupe, then tail live events. The cross-variant `id` field is read from the raw `_json()` value:\n\n```java\nimport com.anthropic.core.JsonValue;\nimport java.util.HashSet;\nimport java.util.Map;\nimport java.util.Optional;\n\ntry (var stream = client.beta().sessions().events().streamStreaming(session.id())) {\n    // Stream is open and buffering. List history before tailing live.\n    var seenEventIds = new HashSet<String>();\n    for (var past : client.beta().sessions().events().list(session.id()).autoPager()) {\n        Optional<Map<String, JsonValue>> obj = past._json().orElseThrow().asObject();\n        seenEventIds.add(obj.orElseThrow().get(\"id\").asStringOrThrow());\n    }\n\n    // Tail live events, skipping anything already seen\n    for (var event : (Iterable<StreamEvents>) stream.stream()::iterator) {\n        Optional<Map<String, JsonValue>> obj = event._json().orElseThrow().asObject();\n        if (!seenEventIds.add(obj.orElseThrow().get(\"id\").asStringOrThrow())) continue;\n        if (event.isAgentMessage()) {\n            event.asAgentMessage().content().forEach(block -> System.out.print(block.text()));\n        } else if (event.isSessionStatusIdle()) {\n            break;\n        }\n    }\n}\n```\n\n---\n\n## Provide Custom Tool Result\n\n> ℹ️ The Java managed-agents bindings for `user.custom_tool_result` are not yet documented in this skill or in the apps source examples. Refer to `shared/managed-agents-events.md` for the wire format and the `anthropic-java` repository for the corresponding params types.\n\n---\n\n## Poll Events\n\n```java\nfor (var event : client.beta().sessions().events().list(session.id()).autoPager()) {\n    System.out.println(event.type() + \": \" + event);\n}\n```\n\n---\n\n## Upload a File\n\n```java\nimport com.anthropic.models.beta.files.FileUploadParams;\nimport com.anthropic.models.beta.sessions.BetaManagedAgentsFileResourceParams;\nimport java.nio.file.Path;\n\nvar dataCsv = Path.of(\"data.csv\");\n\nvar file = client.beta().files().upload(FileUploadParams.builder()\n    .file(dataCsv)\n    .build());\nSystem.out.println(\"File ID: \" + file.id());\n\n// Mount in a session\nvar session = client.beta().sessions().create(SessionCreateParams.builder()\n    .agent(agent.id())\n    .environmentId(environment.id())\n    .addResource(BetaManagedAgentsFileResourceParams.builder()\n        .type(BetaManagedAgentsFileResourceParams.Type.FILE)\n        .fileId(file.id())\n        .mountPath(\"/workspace/data.csv\")\n        .build())\n    .build());\n```\n\n### Add and Manage Resources on an Existing Session\n\n```java\nimport com.anthropic.models.beta.sessions.resources.ResourceAddParams;\nimport com.anthropic.models.beta.sessions.resources.ResourceDeleteParams;\n\n// Attach an additional file to an open session\nvar resource = client.beta().sessions().resources().add(session.id(), ResourceAddParams.builder()\n    .betaManagedAgentsFileResourceParams(BetaManagedAgentsFileResourceParams.builder()\n        .type(BetaManagedAgentsFileResourceParams.Type.FILE)\n        .fileId(file.id())\n        .build())\n    .build());\nSystem.out.println(resource.id()); // \"sesrsc_01ABC...\"\n\n// List resources on the session — entries are a discriminated union\nvar listed = client.beta().sessions().resources().list(session.id());\nfor (var entry : listed.data()) {\n    if (entry.isFile()) {\n        var fileResource = entry.asFile();\n        System.out.println(fileResource.id() + \" \" + fileResource.type());\n    } else if (entry.isGitHubRepository()) {\n        var repoResource = entry.asGitHubRepository();\n        System.out.println(repoResource.id() + \" \" + repoResource.type());\n    }\n}\n\n// Detach a resource\nclient.beta().sessions().resources().delete(resource.id(), ResourceDeleteParams.builder()\n    .sessionId(session.id())\n    .build());\n```\n\n---\n\n## List and Download Session Files\n\n> ℹ️ Listing and downloading files an agent wrote during a session is not yet documented for Java in this skill or in the apps source examples. See `shared/managed-agents-events.md` and the `anthropic-java` repository for the file list/download bindings.\n\n---\n\n## Session Management\n\n```java\n// List environments\nvar environments = client.beta().environments().list();\n\n// Retrieve a specific environment\nvar env = client.beta().environments().retrieve(environment.id());\n\n// Archive an environment (read-only, existing sessions continue)\nclient.beta().environments().archive(environment.id());\n\n// Delete an environment (only if no sessions reference it)\nclient.beta().environments().delete(environment.id());\n\n// Delete a session\nclient.beta().sessions().delete(session.id());\n```\n\n---\n\n## MCP Server Integration\n\n```java\nimport com.anthropic.models.beta.agents.BetaManagedAgentsMcpToolsetParams;\nimport com.anthropic.models.beta.agents.BetaManagedAgentsUrlMcpServerParams;\n\n// Agent declares MCP server (no auth here — auth goes in a vault)\nvar agent = client.beta().agents().create(AgentCreateParams.builder()\n    .name(\"GitHub Assistant\")\n    .model(\"claude-opus-4-8\")\n    .addMcpServer(BetaManagedAgentsUrlMcpServerParams.builder()\n        .type(BetaManagedAgentsUrlMcpServerParams.Type.URL)\n        .name(\"github\")\n        .url(\"https://api.githubcopilot.com/mcp/\")\n        .build())\n    .addTool(BetaManagedAgentsAgentToolset20260401Params.builder()\n        .type(BetaManagedAgentsAgentToolset20260401Params.Type.AGENT_TOOLSET_20260401)\n        .build())\n    .addTool(BetaManagedAgentsMcpToolsetParams.builder()\n        .type(BetaManagedAgentsMcpToolsetParams.Type.MCP_TOOLSET)\n        .mcpServerName(\"github\")\n        .build())\n    .build());\n\n// Session attaches vault(s) containing credentials for those MCP server URLs\nvar session = client.beta().sessions().create(SessionCreateParams.builder()\n    .agent(BetaManagedAgentsAgentParams.builder()\n        .type(BetaManagedAgentsAgentParams.Type.AGENT)\n        .id(agent.id())\n        .version(agent.version())\n        .build())\n    .environmentId(environment.id())\n    .addVaultId(vault.id())\n    .build());\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n\n---\n\n## Vaults\n\n```java\nimport com.anthropic.core.JsonValue;\nimport com.anthropic.models.beta.vaults.VaultCreateParams;\nimport com.anthropic.models.beta.vaults.credentials.BetaManagedAgentsMcpOAuthCreateParams;\nimport com.anthropic.models.beta.vaults.credentials.BetaManagedAgentsMcpOAuthRefreshParams;\nimport com.anthropic.models.beta.vaults.credentials.BetaManagedAgentsMcpOAuthRefreshUpdateParams;\nimport com.anthropic.models.beta.vaults.credentials.BetaManagedAgentsMcpOAuthUpdateParams;\nimport com.anthropic.models.beta.vaults.credentials.CredentialCreateParams;\nimport com.anthropic.models.beta.vaults.credentials.CredentialUpdateParams;\nimport java.time.OffsetDateTime;\n\n// Create a vault\nvar vault = client.beta().vaults().create(VaultCreateParams.builder()\n    .displayName(\"Alice\")\n    .metadata(VaultCreateParams.Metadata.builder()\n        .putAdditionalProperty(\"external_user_id\", JsonValue.from(\"usr_abc123\"))\n        .build())\n    .build());\nSystem.out.println(vault.id()); // \"vlt_01ABC...\"\n\n// Add an OAuth credential\nvar credential = client.beta().vaults().credentials().create(vault.id(),\n    CredentialCreateParams.builder()\n        .displayName(\"Alice's Slack\")\n        .auth(BetaManagedAgentsMcpOAuthCreateParams.builder()\n            .type(BetaManagedAgentsMcpOAuthCreateParams.Type.MCP_OAUTH)\n            .mcpServerUrl(\"https://mcp.slack.com/mcp\")\n            .accessToken(\"xoxp-...\")\n            .expiresAt(OffsetDateTime.parse(\"2026-04-15T00:00:00Z\"))\n            .refresh(BetaManagedAgentsMcpOAuthRefreshParams.builder()\n                .tokenEndpoint(\"https://slack.com/api/oauth.v2.access\")\n                .clientId(\"1234567890.0987654321\")\n                .scope(\"channels:read chat:write\")\n                .refreshToken(\"xoxe-1-...\")\n                .clientSecretPostTokenEndpointAuth(\"abc123...\")\n                .build())\n            .build())\n        .build());\n\n// Rotate the credential (e.g., after a token refresh)\nclient.beta().vaults().credentials().update(credential.id(),\n    CredentialUpdateParams.builder()\n        .vaultId(vault.id())\n        .auth(BetaManagedAgentsMcpOAuthUpdateParams.builder()\n            .type(BetaManagedAgentsMcpOAuthUpdateParams.Type.MCP_OAUTH)\n            .accessToken(\"xoxp-new-...\")\n            .expiresAt(OffsetDateTime.parse(\"2026-05-15T00:00:00Z\"))\n            .refresh(BetaManagedAgentsMcpOAuthRefreshUpdateParams.builder()\n                .refreshToken(\"xoxe-1-new-...\")\n                .build())\n            .build())\n        .build());\n\n// Archive a vault\nclient.beta().vaults().archive(vault.id());\n```\n\n---\n\n## GitHub Repository Integration\n\nMount a GitHub repository as a session resource (a vault holds the GitHub MCP credential):\n\n```java\nimport com.anthropic.models.beta.sessions.BetaManagedAgentsGitHubRepositoryResourceParams;\n\nvar session = client.beta().sessions().create(SessionCreateParams.builder()\n    .agent(agent.id())\n    .environmentId(environment.id())\n    .addVaultId(vault.id())\n    .addResource(BetaManagedAgentsGitHubRepositoryResourceParams.builder()\n        .type(BetaManagedAgentsGitHubRepositoryResourceParams.Type.GITHUB_REPOSITORY)\n        .url(\"https://github.com/org/repo\")\n        .mountPath(\"/workspace/repo\")\n        .authorizationToken(\"ghp_your_github_token\")\n        .build())\n    .build());\n```\n\nMultiple repositories on the same session:\n\n```java\nimport java.util.List;\n\nvar resources = List.of(\n    BetaManagedAgentsGitHubRepositoryResourceParams.builder()\n        .type(BetaManagedAgentsGitHubRepositoryResourceParams.Type.GITHUB_REPOSITORY)\n        .url(\"https://github.com/org/frontend\")\n        .mountPath(\"/workspace/frontend\")\n        .authorizationToken(\"ghp_your_github_token\")\n        .build(),\n    BetaManagedAgentsGitHubRepositoryResourceParams.builder()\n        .type(BetaManagedAgentsGitHubRepositoryResourceParams.Type.GITHUB_REPOSITORY)\n        .url(\"https://github.com/org/backend\")\n        .mountPath(\"/workspace/backend\")\n        .authorizationToken(\"ghp_your_github_token\")\n        .build());\n```\n\nRotating a repository's authorization token:\n\n```java\nimport com.anthropic.models.beta.sessions.resources.ResourceUpdateParams;\n\nvar listed = client.beta().sessions().resources().list(session.id());\nvar repoResourceId = listed.data().get(0).asGitHubRepository().id();\n\nclient.beta().sessions().resources().update(repoResourceId, ResourceUpdateParams.builder()\n    .sessionId(session.id())\n    .authorizationToken(\"ghp_your_new_github_token\")\n    .build());\n```\n</doc>\n\n<doc path=\"php/claude-api/README.md\">\n# Claude API — PHP\n\n> **Note:** The PHP SDK is the official Anthropic SDK for PHP. A beta tool runner is available via `$client->beta->messages->toolRunner()`. Structured output helpers are supported via `StructuredOutputModel` classes. Agent SDK is not available. Bedrock, Vertex AI, and Foundry clients are supported.\n\n## Installation\n\n```bash\ncomposer require \"anthropic-ai/sdk\"\n```\n\n## Client Initialization\n\n```php\nuse Anthropic\\Client;\n\n// Using API key from environment variable\n$client = new Client(apiKey: getenv(\"ANTHROPIC_API_KEY\"));\n```\n\n### Amazon Bedrock\n\n```php\nuse Anthropic\\Bedrock\\MantleClient;\n\n// Messages-API Bedrock endpoint. Reads AWS credentials from env.\n$client = new MantleClient(awsRegion: 'us-east-1');\n```\n\nModel IDs on Bedrock take an `anthropic.` prefix — e.g. `model: 'anthropic.claude-opus-4-8'`.\n\n### Google Vertex AI\n\n```php\nuse Anthropic\\Vertex;\n\n// Constructor is private. Parameter is `location`, not `region`.\n$client = Vertex\\Client::fromEnvironment(\n    location: 'us-east5',\n    projectId: 'my-project-id',\n);\n```\n\n### Anthropic Foundry\n\n```php\nuse Anthropic\\Foundry;\n\n// Constructor is private. baseUrl or resource is required.\n$client = Foundry\\Client::withCredentials(\n    apiKey: getenv('ANTHROPIC_FOUNDRY_API_KEY'),\n    baseUrl: 'https://<resource>.services.ai.azure.com/anthropic/v1',\n);\n```\n\n---\n\n## Basic Message Request\n\n```php\n$message = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    messages: [\n        ['role' => 'user', 'content' => 'What is the capital of France?'],\n    ],\n);\n\n// content is an array of polymorphic blocks (TextBlock, ToolUseBlock,\n// ThinkingBlock). Accessing ->text on content[0] without checking the block\n// type will throw if the first block is not a TextBlock (e.g., when extended\n// thinking is enabled and a ThinkingBlock comes first). Always guard:\nforeach ($message->content as $block) {\n    if ($block->type === 'text') {\n        echo $block->text;\n    }\n}\n```\n\nIf you only want the first text block:\n\n```php\nforeach ($message->content as $block) {\n    if ($block->type === 'text') {\n        echo $block->text;\n        break;\n    }\n}\n```\n\n---\n\n## Extended Thinking\n\n**Adaptive thinking is the recommended mode for Claude 4.6+ models.** Claude decides dynamically when and how much to think.\n\n```php\nuse Anthropic\\Messages\\ThinkingBlock;\n\n$message = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    thinking: ['type' => 'adaptive', 'display' => 'summarized'], // display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n    messages: [\n        ['role' => 'user', 'content' => 'Solve: 27 * 453'],\n    ],\n);\n\n// ThinkingBlock(s) precede TextBlock in content\nforeach ($message->content as $block) {\n    if ($block instanceof ThinkingBlock) {\n        echo \"Thinking:\\n{$block->thinking}\\n\\n\";\n        // $block->signature is an opaque string — preserve verbatim if\n        // passing thinking blocks back in multi-turn conversations\n    } elseif ($block->type === 'text') {\n        echo \"Answer: {$block->text}\\n\";\n    }\n}\n```\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking (above). `['type' => 'enabled', 'budgetTokens' => N]` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `thinking: ['type' => 'enabled', 'budgetTokens' => N]` (budget must be < `maxTokens`, min 1024).\n\n`$block->type === 'thinking'` also works for the check; `instanceof` narrows for PHPStan.\n\n---\n\n## Prompt Caching\n\n`system:` takes an array of text blocks; set `cacheControl` on the last block. Array-shape syntax (camelCase keys) is idiomatic. For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.\n\n```php\n$message = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    system: [\n        ['type' => 'text', 'text' => $longSystemPrompt, 'cacheControl' => ['type' => 'ephemeral']],\n    ],\n    messages: [['role' => 'user', 'content' => 'Summarize the key points']],\n);\n```\n\nFor 1-hour TTL: `'cacheControl' => ['type' => 'ephemeral', 'ttl' => '1h']`. There's also a top-level `cacheControl:` on `messages->create(...)` that auto-places on the last cacheable block.\n\nVerify hits via `$message->usage->cacheCreationInputTokens` / `$message->usage->cacheReadInputTokens`.\n\n---\n\n## Stop Details\n\nWhen `stopReason` is `'refusal'`, the response includes structured `stopDetails`:\n\n```php\nif ($message->stopReason === 'refusal' && $message->stopDetails !== null) {\n    echo \"Category: \" . $message->stopDetails->category . \"\\n\";     // e.g. \"cyber\", \"bio\", \"reasoning_extraction\", \"frontier_llm\", or null — see docs for the full set\n    echo \"Explanation: \" . $message->stopDetails->explanation . \"\\n\";\n}\n```\n\n**Refusal fallbacks (Claude Fable 5) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. New `claude-fable-5` code should include the server-side `fallbacks` parameter (beta header `server-side-fallback-2026-06-01`, fallback model `claude-opus-4-8`, on the beta messages call) by default. The exact PHP binding (and the client-side middleware for providers without server-side support) is not documented here — WebFetch the PHP SDK repo's `examples/` from `shared/live-sources.md`; full semantics in `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Error Type\n\n`APIStatusException` exposes a `->type` property for programmatic error classification:\n\n```php\ntry {\n    $client->messages->create(...);\n} catch (\\Anthropic\\Core\\Exceptions\\APIStatusException $e) {\n    echo $e->type?->value;  // \"rate_limit_error\", \"overloaded_error\", etc.\n}\n```\n</doc>\n\n<doc path=\"php/claude-api/batches.md\">\n# Message Batches — PHP\n\n## Message Batches API\n\n```php\n$batch = $client->messages->batches->create(requests: [\n    ['customId' => 'req-1', 'params' => ['model' => 'claude-opus-4-8', 'maxTokens' => 1024, 'messages' => [...]]],\n    ['customId' => 'req-2', 'params' => [...]],\n]);\n// Poll $client->messages->batches->retrieve($batch->id) until processingStatus === 'ended',\n// then iterate $client->messages->batches->results($batch->id).\n```\n\n---\n</doc>\n\n<doc path=\"php/claude-api/files-api.md\">\n# Files API — PHP\n\n## Files API\n\n```php\n$file = $client->beta->files->upload(\n    file: fopen('upload_me.txt', 'r'),\n    betas: ['files-api-2025-04-14'],\n);\n// Reference $file->id as a file content block on ->beta->messages->create().\n```\n</doc>\n\n<doc path=\"php/claude-api/streaming.md\">\n# Streaming — PHP\n\n## Streaming\n\n> **Requires SDK v0.5.0+.** v0.4.0 and earlier used a single `$params` array; calling with named parameters throws `Unknown named parameter $model`. Upgrade: `composer require \"anthropic-ai/sdk:^0.7\"`\n\n```php\nuse Anthropic\\Messages\\RawContentBlockDeltaEvent;\nuse Anthropic\\Messages\\TextDelta;\n\n$stream = $client->messages->createStream(\n    model: 'claude-opus-4-8',\n    maxTokens: 64000,\n    messages: [\n        ['role' => 'user', 'content' => 'Write a haiku'],\n    ],\n);\n\nforeach ($stream as $event) {\n    if ($event instanceof RawContentBlockDeltaEvent && $event->delta instanceof TextDelta) {\n        echo $event->delta->text;\n    }\n}\n```\n\n---\n</doc>\n\n<doc path=\"php/claude-api/tool-use.md\">\n# Tool Use — PHP\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Use\n\n### Tool Runner (Beta)\n\n**Beta:** The PHP SDK provides a tool runner via `$client->beta->messages->toolRunner()`. Define tools with `BetaRunnableTool` — a definition array plus a `run` closure:\n\n```php\nuse Anthropic\\Lib\\Tools\\BetaRunnableTool;\n\n$weatherTool = new BetaRunnableTool(\n    definition: [\n        'name' => 'get_weather',\n        'description' => 'Get the current weather for a location.',\n        'inputSchema' => [\n            'type' => 'object',\n            'properties' => [\n                'location' => ['type' => 'string', 'description' => 'City and state'],\n            ],\n            'required' => ['location'],\n        ],\n    ],\n    run: function (array $input): string {\n        return \"The weather in {$input['location']} is sunny and 72°F.\";\n    },\n);\n\n$runner = $client->beta->messages->toolRunner(\n    maxTokens: 16000,\n    messages: [['role' => 'user', 'content' => 'What is the weather in Paris?']],\n    model: 'claude-opus-4-8',\n    tools: [$weatherTool],\n);\n\nforeach ($runner as $message) {\n    foreach ($message->content as $block) {\n        if ($block->type === 'text') {\n            echo $block->text;\n        }\n    }\n}\n```\n\n### Manual Loop\n\nTools are passed as arrays. **The SDK uses camelCase keys** (`inputSchema`, `toolUseID`, `stopReason`) and auto-maps to the API's snake_case on the wire — since v0.5.0. See [shared tool use concepts](../../shared/tool-use-concepts.md) for the loop pattern.\n\n```php\nuse Anthropic\\Messages\\ToolUseBlock;\n\n$tools = [\n    [\n        'name' => 'get_weather',\n        'description' => 'Get the current weather in a given location',\n        'inputSchema' => [  // camelCase, not input_schema\n            'type' => 'object',\n            'properties' => [\n                'location' => ['type' => 'string', 'description' => 'City and state'],\n            ],\n            'required' => ['location'],\n        ],\n    ],\n];\n\n$messages = [['role' => 'user', 'content' => 'What is the weather in SF?']];\n\n$response = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    tools: $tools,\n    messages: $messages,\n);\n\nwhile ($response->stopReason === 'tool_use') {  // camelCase property\n    $toolResults = [];\n    foreach ($response->content as $block) {\n        if ($block instanceof ToolUseBlock) {\n            // $block->name  : string               — tool name to dispatch on\n            // $block->input : array<string,mixed>  — parsed JSON input\n            // $block->id    : string               — pass back as toolUseID\n            $result = executeYourTool($block->name, $block->input);\n            $toolResults[] = [\n                'type' => 'tool_result',\n                'toolUseID' => $block->id,  // camelCase, not tool_use_id\n                'content' => $result,\n            ];\n        }\n    }\n\n    // Append assistant turn + user turn with tool results\n    $messages[] = ['role' => 'assistant', 'content' => $response->content];\n    $messages[] = ['role' => 'user', 'content' => $toolResults];\n\n    $response = $client->messages->create(\n        model: 'claude-opus-4-8',\n        maxTokens: 16000,\n        tools: $tools,\n        messages: $messages,\n    );\n}\n\n// Final text response\nforeach ($response->content as $block) {\n    if ($block->type === 'text') {\n        echo $block->text;\n    }\n}\n```\n\n`$block->type === 'tool_use'` also works; `instanceof ToolUseBlock` narrows for PHPStan.\n\n\n---\n\n## Structured Outputs\n\n### Using StructuredOutputModel (Recommended)\n\nDefine a PHP class implementing `StructuredOutputModel` and pass it as `outputConfig`:\n\n```php\nuse Anthropic\\Lib\\Contracts\\StructuredOutputModel;\nuse Anthropic\\Lib\\Concerns\\StructuredOutputModelTrait;\nuse Anthropic\\Lib\\Attributes\\Constrained;\n\nclass Person implements StructuredOutputModel\n{\n    use StructuredOutputModelTrait;\n\n    #[Constrained(description: 'Full name')]\n    public string $name;\n\n    public int $age;\n\n    public ?string $email = null;  // nullable = optional field\n}\n\n$message = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    messages: [['role' => 'user', 'content' => 'Generate a profile for Alice, age 30']],\n    outputConfig: ['format' => Person::class],\n);\n\n$person = $message->parsedOutput();  // Person instance\necho $person->name;\n```\n\nTypes are inferred from PHP type hints. Use `#[Constrained(description: '...')]` to add descriptions. Nullable properties (`?string`) become optional fields.\n\n### Raw Schema\n\n```php\n$message = $client->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    messages: [['role' => 'user', 'content' => 'Extract: John (john@co.com), Enterprise plan']],\n    outputConfig: [\n        'format' => [\n            'type' => 'json_schema',\n            'schema' => [\n                'type' => 'object',\n                'properties' => [\n                    'name' => ['type' => 'string'],\n                    'email' => ['type' => 'string'],\n                    'plan' => ['type' => 'string'],\n                ],\n                'required' => ['name', 'email', 'plan'],\n                'additionalProperties' => false,\n            ],\n        ],\n    ],\n);\n\n// First text block contains valid JSON\nforeach ($message->content as $block) {\n    if ($block->type === 'text') {\n        $data = json_decode($block->text, true);\n        break;\n    }\n}\n```\n\n---\n\n## Beta Features & Anthropic-Defined Tools\n\n**`betas:` is NOT a param on `$client->messages->create()`** — it only exists on the beta namespace. Use it for features that need an explicit opt-in header:\n\n```php\nuse Anthropic\\Beta\\Messages\\BetaRequestMCPServerURLDefinition;\n\n$response = $client->beta->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    mcpServers: [\n        BetaRequestMCPServerURLDefinition::with(\n            name: 'my-server',\n            url: 'https://example.com/mcp',\n        ),\n    ],\n    betas: ['mcp-client-2025-11-20'],  // only valid on ->beta->messages\n    messages: [['role' => 'user', 'content' => 'Use the MCP tools']],\n);\n```\n\n### Task budgets\n\n```php\n$response = $client->beta->messages->create(\n    model: 'claude-opus-4-8',\n    maxTokens: 16000,\n    outputConfig: ['taskBudget' => ['type' => 'tokens', 'total' => 64000]],\n    tools: [...],\n    messages: [...],\n    betas: ['task-budgets-2026-03-13'],\n);\n```\n\n### Cache diagnostics\n\nPass the previous response's `id` on the next request; print the `diagnostics` object on the response:\n\n```php\n$r2 = $client->beta->messages->create(\n    model: 'claude-opus-4-8', maxTokens: 1024,\n    diagnostics: ['previousMessageId' => $r1->id],\n    betas: ['cache-diagnosis-2026-04-07'],\n    messages: [...],\n);\n```\n\n**Anthropic-defined tools** (bash, web_search, text_editor, code_execution) are GA and work on both paths. Of these, web_search and code_execution are server-executed; bash and text_editor are client-executed (you handle the `tool_use` locally) — `Anthropic\\Messages\\ToolBash20250124` / `WebSearchTool20260209` / `ToolTextEditor20250728` / `CodeExecutionTool20260120` for non-beta, `Anthropic\\Beta\\Messages\\BetaToolBash20250124` / `BetaWebSearchTool20260209` / `BetaToolTextEditor20250728` / `BetaCodeExecutionTool20260120` for beta. No `betas:` header needed for these.\n\n### Tool search (non-beta, server-side)\n\n```php\ntools: [\n    ['type' => 'tool_search_tool_regex_20251119', 'name' => 'tool_search_tool_regex'],\n    ['name' => 'get_weather', 'description' => '...', 'inputSchema' => [...], 'deferLoading' => true],\n    // ... other user tools with 'deferLoading' => true\n],\n```\n\n### Memory tool (non-beta, client-executed)\n\nDeclare `['type' => 'memory_20250818', 'name' => 'memory']`. Handle the `tool_use` by reading/writing files under a fixed `/memories` directory. **Validate every model-supplied path**: resolve to its canonical form and verify it remains within the memory directory; reject traversal (`..`, symlinks) — see `shared/tool-use-concepts.md` § Client-Side Tools.\n\n---\n</doc>\n\n<doc path=\"php/managed-agents/README.md\">\n# Managed Agents — PHP\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for PHP. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the PHP SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `$client->beta->agents->create` and pass it to every subsequent `->sessions->create`; do not call `agents->create` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```bash\ncomposer require \"anthropic-ai/sdk\" \"guzzlehttp/guzzle:^7\"\n```\n\n## Client Initialization\n\n```php\nuse Anthropic\\Client;\n\n// Default (uses ANTHROPIC_API_KEY env var)\n$client = new Client();\n\n// Explicit API key\n$client = new Client(apiKey: 'your-api-key');\n```\n\n---\n\n## Create an Environment\n\n```php\n$environment = $client->beta->environments->create(\n    name: 'my-dev-env',\n    config: ['type' => 'cloud', 'networking' => ['type' => 'unrestricted']],\n);\necho \"Environment ID: {$environment->id}\\n\"; // env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** `model`/`system`/`tools` live on the agent object, not the session. Always start with `$client->beta->agents->create()` — the session takes either `agent: $agent->id` or the typed `BetaManagedAgentsAgentParams::with(type: 'agent', id: $agent->id, version: $agent->version)`.\n\n### Minimal\n\n```php\nuse Anthropic\\Beta\\Agents\\BetaManagedAgentsAgentToolset20260401Params;\n\n// 1. Create the agent (reusable, versioned)\n$agent = $client->beta->agents->create(\n    name: 'Coding Assistant',\n    model: 'claude-opus-4-8',\n    system: 'You are a helpful coding assistant.',\n    tools: [\n        BetaManagedAgentsAgentToolset20260401Params::with(\n            type: 'agent_toolset_20260401',\n        ),\n    ],\n);\n\n// 2. Start a session\n$session = $client->beta->sessions->create(\n    agent: ['type' => 'agent', 'id' => $agent->id, 'version' => $agent->version],\n    environmentID: $environment->id,\n    title: 'Quickstart session',\n);\necho \"Session ID: {$session->id}\\n\";\necho \"Trace: https://platform.claude.com/workspaces/default/sessions/{$session->id}\\n\";\n```\n\n### Updating an Agent\n\nUpdates create new versions; the agent object is immutable per version.\n\n```php\n$updatedAgent = $client->beta->agents->update(\n    $agent->id,\n    version: $agent->version,\n    system: 'You are a helpful coding agent. Always write tests.',\n);\necho \"New version: {$updatedAgent->version}\\n\";\n\n// List all versions\nforeach ($client->beta->agents->versions->list($agent->id)->pagingEachItem() as $version) {\n    echo \"Version {$version->version}: {$version->updatedAt->format(DateTimeInterface::ATOM)}\\n\";\n}\n\n// Archive the agent\n$archived = $client->beta->agents->archive($agent->id);\necho \"Archived at: {$archived->archivedAt->format(DateTimeInterface::ATOM)}\\n\";\n```\n\n---\n\n## Send a User Message\n\n```php\n$client->beta->sessions->events->send(\n    $session->id,\n    events: [\n        [\n            'type' => 'user.message',\n            'content' => [['type' => 'text', 'text' => 'Review the auth module']],\n        ],\n    ],\n);\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n> ℹ️ **Streaming transporter:** PHP's default buffered PSR-18 client never returns for the open-ended session event stream. Use a streaming Guzzle transporter for `streamStream()` calls — other calls keep the default client.\n\n```php\n$streamingClient = new GuzzleHttp\\Client(['stream' => true]);\n\n// Open the stream first, then send the user message\n$stream = $client->beta->sessions->events->streamStream(\n    $session->id,\n    requestOptions: ['transporter' => $streamingClient],\n);\n$client->beta->sessions->events->send(\n    $session->id,\n    events: [\n        [\n            'type' => 'user.message',\n            'content' => [['type' => 'text', 'text' => 'Summarize the repo README']],\n        ],\n    ],\n);\n\nforeach ($stream as $event) {\n    match ($event->type) {\n        'agent.message' => array_walk(\n            $event->content,\n            static fn($block) => $block->type === 'text' ? print($block->text) : null,\n        ),\n        'agent.tool_use' => print(\"\\n[Using tool: {$event->name}]\\n\"),\n        'session.error' => printf(\"\\n[Error: %s]\", $event->error?->message ?? 'unknown'),\n        default => null,\n    };\n    if ($event->type === 'session.status_idle' || $event->type === 'session.error') {\n        break;\n    }\n}\n$stream->close();\n```\n\n### Reconnecting and Tailing\n\nWhen reconnecting mid-session, list past events first to dedupe, then tail live events:\n\n```php\n$stream = $client->beta->sessions->events->streamStream(\n    $session->id,\n    requestOptions: ['transporter' => $streamingClient],\n);\n\n// Stream is open and buffering. List history before tailing live.\n$seenEventIds = [];\nforeach ($client->beta->sessions->events->list($session->id)->pagingEachItem() as $event) {\n    $seenEventIds[$event->id] = true;\n}\n\n// Tail live events, skipping anything already seen\nforeach ($stream as $event) {\n    if (isset($seenEventIds[$event->id])) {\n        continue;\n    }\n    $seenEventIds[$event->id] = true;\n    match ($event->type) {\n        'agent.message' => array_walk(\n            $event->content,\n            static fn($block) => $block->type === 'text' ? print($block->text) : null,\n        ),\n        default => null,\n    };\n    if ($event->type === 'session.status_idle') {\n        break;\n    }\n}\n$stream->close();\n```\n\n---\n\n## Provide Custom Tool Result\n\n> ℹ️ The PHP managed-agents bindings for `user.custom_tool_result` are not yet documented in this skill or in the apps source examples. Refer to `shared/managed-agents-events.md` for the wire format and the `anthropic-ai/sdk` PHP repository for the corresponding params.\n\n---\n\n## Poll Events\n\n```php\nforeach ($client->beta->sessions->events->list($session->id)->pagingEachItem() as $event) {\n    echo \"{$event->type}: {$event->id}\\n\";\n}\n```\n\n---\n\n## Upload a File\n\n> ℹ️ **PHP file upload:** The PHP SDK's beta managed-agents file upload binding is not shown in the apps source examples; the canonical PHP example uses raw cURL against `POST /v1/files`. If your codebase prefers the SDK, WebFetch the `anthropic-ai/sdk` PHP repository for the latest binding before writing code.\n\n```php\nuse Anthropic\\Beta\\Sessions\\BetaManagedAgentsFileResourceParams;\n\n// Raw cURL upload (canonical example from the apps source)\n$csvPath = 'data.csv';\n$ch = curl_init('https://api.anthropic.com/v1/files');\ncurl_setopt_array($ch, [\n    CURLOPT_RETURNTRANSFER => true,\n    CURLOPT_POST => true,\n    CURLOPT_HTTPHEADER => [\n        'x-api-key: ' . getenv('ANTHROPIC_API_KEY'),\n        'anthropic-version: 2023-06-01',\n        'anthropic-beta: files-api-2025-04-14',\n    ],\n    CURLOPT_POSTFIELDS => ['file' => new CURLFile($csvPath, 'text/csv', 'data.csv')],\n]);\n$file = json_decode(curl_exec($ch));\necho \"File ID: {$file->id}\\n\";\n\n// Mount in a session\n$session = $client->beta->sessions->create(\n    agent: $agent->id,\n    environmentID: $environment->id,\n    resources: [\n        BetaManagedAgentsFileResourceParams::with(\n            type: 'file',\n            fileID: $file->id,\n            mountPath: '/workspace/data.csv',\n        ),\n    ],\n);\n```\n\n### Add and Manage Resources on an Existing Session\n\n```php\n// Attach an additional file to an open session\n$resource = $client->beta->sessions->resources->add(\n    $session->id,\n    type: 'file',\n    fileID: $file->id,\n);\necho \"{$resource->id}\\n\"; // \"sesrsc_01ABC...\"\n\n// List resources on the session\n$listed = $client->beta->sessions->resources->list($session->id);\nforeach ($listed->data as $entry) {\n    echo \"{$entry->id} {$entry->type}\\n\";\n}\n\n// Detach a resource\n$client->beta->sessions->resources->delete($resource->id, sessionID: $session->id);\n```\n\n---\n\n## List and Download Session Files\n\n```php\n$files = $client->beta->files->list(\n    scopeID: 'sesn_abc123',\n    betas: ['managed-agents-2026-04-01'],\n);\n$content = $client->beta->files->download($files->data[0]->id);\nfile_put_contents('output.txt', $content);\n```\n\n---\n\n## Session Management\n\n```php\n// List environments\n$environments = $client->beta->environments->list();\n\n// Retrieve a specific environment\n$env = $client->beta->environments->retrieve($environment->id);\n\n// Archive an environment (read-only, existing sessions continue)\n$client->beta->environments->archive($environment->id);\n\n// Delete an environment (only if no sessions reference it)\n$client->beta->environments->delete($environment->id);\n\n// Delete a session\n$client->beta->sessions->delete($session->id);\n```\n\n---\n\n## MCP Server Integration\n\n```php\nuse Anthropic\\Beta\\Agents\\BetaManagedAgentsAgentToolset20260401Params;\nuse Anthropic\\Beta\\Agents\\BetaManagedAgentsMCPToolsetParams;\nuse Anthropic\\Beta\\Agents\\BetaManagedAgentsURLMCPServerParams;\nuse Anthropic\\Beta\\Sessions\\BetaManagedAgentsAgentParams;\n\n// Agent declares MCP server (no auth here — auth goes in a vault)\n$agent = $client->beta->agents->create(\n    name: 'GitHub Assistant',\n    model: 'claude-opus-4-8',\n    mcpServers: [\n        BetaManagedAgentsURLMCPServerParams::with(\n            type: 'url',\n            name: 'github',\n            url: 'https://api.githubcopilot.com/mcp/',\n        ),\n    ],\n    tools: [\n        BetaManagedAgentsAgentToolset20260401Params::with(type: 'agent_toolset_20260401'),\n        BetaManagedAgentsMCPToolsetParams::with(\n            type: 'mcp_toolset',\n            mcpServerName: 'github',\n        ),\n    ],\n);\n\n// Session attaches vault(s) containing credentials for those MCP server URLs\n$session = $client->beta->sessions->create(\n    agent: BetaManagedAgentsAgentParams::with(\n        type: 'agent',\n        id: $agent->id,\n        version: $agent->version,\n    ),\n    environmentID: $environment->id,\n    vaultIDs: [$vault->id],\n);\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n\n---\n\n## Vaults\n\n```php\n// Create a vault\n$vault = $client->beta->vaults->create(\n    displayName: 'Alice',\n    metadata: ['external_user_id' => 'usr_abc123'],\n);\necho $vault->id . \"\\n\"; // \"vlt_01ABC...\"\n\n// Add an OAuth credential\n$credential = $client->beta->vaults->credentials->create(\n    vaultID: $vault->id,\n    displayName: \"Alice's Slack\",\n    auth: [\n        'type' => 'mcp_oauth',\n        'mcp_server_url' => 'https://mcp.slack.com/mcp',\n        'access_token' => 'xoxp-...',\n        'expires_at' => '2026-04-15T00:00:00Z',\n        'refresh' => [\n            'token_endpoint' => 'https://slack.com/api/oauth.v2.access',\n            'client_id' => '1234567890.0987654321',\n            'scope' => 'channels:read chat:write',\n            'refresh_token' => 'xoxe-1-...',\n            'token_endpoint_auth' => [\n                'type' => 'client_secret_post',\n                'client_secret' => 'abc123...',\n            ],\n        ],\n    ],\n);\n\n// Rotate the credential (e.g., after a token refresh)\n$client->beta->vaults->credentials->update(\n    $credential->id,\n    vaultID: $vault->id,\n    auth: [\n        'type' => 'mcp_oauth',\n        'access_token' => 'xoxp-new-...',\n        'expires_at' => '2026-05-15T00:00:00Z',\n        'refresh' => ['refresh_token' => 'xoxe-1-new-...'],\n    ],\n);\n\n// Archive a vault\n$client->beta->vaults->archive($vault->id);\n```\n\n---\n\n## GitHub Repository Integration\n\nMount a GitHub repository as a session resource (a vault holds the GitHub MCP credential):\n\n```php\n$session = $client->beta->sessions->create(\n    agent: $agent->id,\n    environmentID: $environment->id,\n    vaultIDs: [$vault->id],\n    resources: [\n        [\n            'type' => 'github_repository',\n            'url' => 'https://github.com/org/repo',\n            'mount_path' => '/workspace/repo',\n            'authorization_token' => 'ghp_your_github_token',\n        ],\n    ],\n);\n```\n\nMultiple repositories on the same session:\n\n```php\n$resources = [\n    [\n        'type' => 'github_repository',\n        'url' => 'https://github.com/org/frontend',\n        'mount_path' => '/workspace/frontend',\n        'authorization_token' => 'ghp_your_github_token',\n    ],\n    [\n        'type' => 'github_repository',\n        'url' => 'https://github.com/org/backend',\n        'mount_path' => '/workspace/backend',\n        'authorization_token' => 'ghp_your_github_token',\n    ],\n];\n```\n\nRotating a repository's authorization token:\n\n```php\n$listed = $client->beta->sessions->resources->list($session->id);\n$repoResourceId = $listed->data[0]->id;\n\n$client->beta->sessions->resources->update(\n    $repoResourceId,\n    sessionID: $session->id,\n    authorizationToken: 'ghp_your_new_github_token',\n);\n```\n</doc>\n\n<doc path=\"python/claude-api/README.md\">\n# Claude API — Python\n\n## Installation\n\n```bash\npip install anthropic\n```\n\n## Client Initialization\n\n```python\nimport anthropic\n\n# Default — resolves credentials from the environment:\n# ANTHROPIC_API_KEY, or ANTHROPIC_AUTH_TOKEN, or an `ant auth login` profile.\n# Prefer this for local dev; don't hardcode a key.\nclient = anthropic.Anthropic()\n\n# Explicit API key (only when you must inject a specific key)\nclient = anthropic.Anthropic(api_key=\"your-api-key\")\n\n# Async client\nasync_client = anthropic.AsyncAnthropic()\n```\n\n---\n\n## Client Configuration\n\n### Per-request overrides\n\nUse `with_options()` to override client settings for a single call without mutating the client:\n\n```python\nclient.with_options(timeout=5.0, max_retries=5).messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=1024,\n    messages=[{\"role\": \"user\", \"content\": \"Hello\"}],\n)\n```\n\n### Timeouts\n\nDefault request timeout is 10 minutes. Pass a float (seconds) or an `httpx.Timeout` for granular control. On timeout the SDK raises `anthropic.APITimeoutError` (and retries per `max_retries`).\n\n```python\nimport httpx\n\nclient = anthropic.Anthropic(timeout=20.0)\nclient = anthropic.Anthropic(\n    timeout=httpx.Timeout(60.0, read=5.0, write=10.0, connect=2.0),\n)\n```\n\n### Retries\n\nThe SDK auto-retries connection errors, 408, 409, 429, and ≥500 with exponential backoff (default 2 retries). Set `max_retries` on the client or via `with_options()`; `max_retries=0` disables.\n\n### Async performance (aiohttp backend)\n\nFor high-concurrency async workloads, install `anthropic[aiohttp]` and pass `DefaultAioHttpClient` instead of the default httpx backend:\n\n```python\nfrom anthropic import AsyncAnthropic, DefaultAioHttpClient\n\nasync with AsyncAnthropic(http_client=DefaultAioHttpClient()) as client:\n    ...\n```\n\n### Custom HTTP client (proxy, base URL)\n\nUse `DefaultHttpxClient` / `DefaultAsyncHttpxClient` — not raw `httpx.Client` — so the SDK's default timeouts and connection limits are preserved:\n\n```python\nfrom anthropic import Anthropic, DefaultHttpxClient\n\nclient = Anthropic(\n    base_url=\"http://my.test.server.example.com:8083\",  # or ANTHROPIC_BASE_URL env var\n    http_client=DefaultHttpxClient(proxy=\"http://my.test.proxy.example.com\"),\n)\n```\n\n### Logging\n\nSet `ANTHROPIC_LOG=debug` (or `info`) to enable SDK logging via the standard `logging` module.\n\n---\n\n## Basic Message Request\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[\n        {\"role\": \"user\", \"content\": \"What is the capital of France?\"}\n    ]\n)\n# response.content is a list of content block objects (TextBlock, ThinkingBlock,\n# ToolUseBlock, ...). Check .type before accessing .text.\nfor block in response.content:\n    if block.type == \"text\":\n        print(block.text)\n```\n\n---\n\n## System Prompts\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    system=\"You are a helpful coding assistant. Always provide examples in Python.\",\n    messages=[{\"role\": \"user\", \"content\": \"How do I read a JSON file?\"}]\n)\n```\n\n### Mid-conversation system messages (model-gated)\n\nFor operator instructions that arrive mid-conversation (mode switches, injected state), append `{\"role\": \"system\", ...}` to `messages` instead of editing top-level `system` — this preserves the cached prefix and carries operator authority. Must follow a user message (or an `assistant` message ending in server-tool use), and must be either the last entry in `messages` or be followed by an `assistant` turn; cannot be `messages[0]`. Unsupported models return a 400 (`role 'system' is not supported on this model`). See `shared/prompt-caching.md` for when to use this vs. top-level `system`.\n\n```python\nresponse = client.messages.create(\n    model=MODEL_ID,  # must support mid-conversation system messages\n    max_tokens=16000,\n    system=[{\"type\": \"text\", \"text\": STABLE_SYSTEM, \"cache_control\": {\"type\": \"ephemeral\"}}],\n    messages=history + [\n        {\"role\": \"user\", \"content\": user_message},\n        {\"role\": \"system\", \"content\": \"Terse mode enabled — keep responses under 40 words.\"},\n    ],\n)  # No beta header needed — use regular client.messages.create\n```\n\n---\n\n## Vision (Images)\n\n### Base64\n\n```python\nimport base64\n\nwith open(\"image.png\", \"rb\") as f:\n    image_data = base64.standard_b64encode(f.read()).decode(\"utf-8\")\n\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            {\n                \"type\": \"image\",\n                \"source\": {\n                    \"type\": \"base64\",\n                    \"media_type\": \"image/png\",\n                    \"data\": image_data\n                }\n            },\n            {\"type\": \"text\", \"text\": \"What's in this image?\"}\n        ]\n    }]\n)\n```\n\n### URL\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            {\n                \"type\": \"image\",\n                \"source\": {\n                    \"type\": \"url\",\n                    \"url\": \"https://example.com/image.png\"\n                }\n            },\n            {\"type\": \"text\", \"text\": \"Describe this image\"}\n        ]\n    }]\n)\n```\n\n---\n\n## Prompt Caching\n\nCache large context to reduce costs (up to 90% savings). **Caching is a prefix match** — any byte change anywhere in the prefix invalidates everything after it. For placement patterns, architectural guidance (frozen system prompt, deterministic tool order, where to put volatile content), and the silent-invalidator audit checklist, read `shared/prompt-caching.md`.\n\n### Automatic Caching (Recommended)\n\nUse top-level `cache_control` to automatically cache the last cacheable block in the request — no need to annotate individual content blocks:\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    cache_control={\"type\": \"ephemeral\"},  # auto-caches the last cacheable block\n    system=\"You are an expert on this large document...\",\n    messages=[{\"role\": \"user\", \"content\": \"Summarize the key points\"}]\n)\n```\n\n### Manual Cache Control\n\nFor fine-grained control, add `cache_control` to specific content blocks:\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    system=[{\n        \"type\": \"text\",\n        \"text\": \"You are an expert on this large document...\",\n        \"cache_control\": {\"type\": \"ephemeral\"}  # default TTL is 5 minutes\n    }],\n    messages=[{\"role\": \"user\", \"content\": \"Summarize the key points\"}]\n)\n\n# With explicit TTL (time-to-live)\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    system=[{\n        \"type\": \"text\",\n        \"text\": \"You are an expert on this large document...\",\n        \"cache_control\": {\"type\": \"ephemeral\", \"ttl\": \"1h\"}  # 1 hour TTL\n    }],\n    messages=[{\"role\": \"user\", \"content\": \"Summarize the key points\"}]\n)\n```\n\n### Verifying Cache Hits\n\n```python\nprint(response.usage.cache_creation_input_tokens)  # tokens written to cache (~1.25x cost)\nprint(response.usage.cache_read_input_tokens)      # tokens served from cache (~0.1x cost)\nprint(response.usage.input_tokens)                 # uncached tokens (full cost)\n```\n\nIf `cache_read_input_tokens` is zero across repeated identical-prefix requests, a silent invalidator is at work — `datetime.now()` or a UUID in the system prompt, unsorted `json.dumps()`, or a varying tool set. See `shared/prompt-caching.md` for the full audit table.\n\n---\n\n## Extended Thinking\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking. `budget_tokens` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `thinking: {type: \"enabled\", budget_tokens: N}` (must be < `max_tokens`, min 1024).\n\n```python\n# Fable 5 / Opus 4.8 / 4.7 / 4.6: adaptive thinking (recommended)\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    thinking={\"type\": \"adaptive\", \"display\": \"summarized\"},  # display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n    output_config={\"effort\": \"high\"},  # low | medium | high | max\n    messages=[{\"role\": \"user\", \"content\": \"Solve this step by step...\"}]\n)\n\n# Access thinking and response\nfor block in response.content:\n    if block.type == \"thinking\":\n        print(f\"Thinking: {block.thinking}\")\n    elif block.type == \"text\":\n        print(f\"Response: {block.text}\")\n```\n\n---\n\n## Error Handling\n\n```python\nimport anthropic\n\ntry:\n    response = client.messages.create(...)\nexcept anthropic.BadRequestError as e:\n    print(f\"Bad request: {e.message}\")\nexcept anthropic.AuthenticationError:\n    print(\"Invalid API key\")\nexcept anthropic.PermissionDeniedError:\n    print(\"API key lacks required permissions\")\nexcept anthropic.NotFoundError:\n    print(\"Invalid model or endpoint\")\nexcept anthropic.RateLimitError as e:\n    retry_after = int(e.response.headers.get(\"retry-after\", \"60\"))\n    print(f\"Rate limited. Retry after {retry_after}s.\")\nexcept anthropic.APIStatusError as e:\n    if e.status_code >= 500:\n        print(f\"Server error ({e.status_code}). Retry later.\")\n    else:\n        print(f\"API error: {e.message}\")\nexcept anthropic.APIConnectionError:\n    print(\"Network error. Check internet connection.\")\n```\n\n---\n\n## Response Helpers\n\nEvery response object exposes `_request_id` (populated from the `request-id` header) — log it when reporting failures to Anthropic. Despite the underscore prefix, this property is public.\n\n```python\nmessage = client.messages.create(...)\nprint(message._request_id)       # req_018EeWyXxfu5pfWkrYcMdjWG\nprint(message.to_json())          # serialize the Pydantic model\nprint(message.to_dict())          # plain dict\n```\n\nTo access raw headers or other response metadata, use `.with_raw_response`:\n\n```python\nraw = client.messages.with_raw_response.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=1024,\n    messages=[{\"role\": \"user\", \"content\": \"Hello\"}],\n)\nprint(raw.headers.get(\"request-id\"))\nmessage = raw.parse()  # the Message object messages.create() would have returned\n```\n\n---\n\n## Multi-Turn Conversations\n\nThe API is stateless — send the full conversation history each time.\n\n```python\nclass ConversationManager:\n    \"\"\"Manage multi-turn conversations with the Claude API.\"\"\"\n\n    def __init__(self, client: anthropic.Anthropic, model: str, system: str = None):\n        self.client = client\n        self.model = model\n        self.system = system\n        self.messages = []\n\n    def send(self, user_message: str, **kwargs) -> str:\n        \"\"\"Send a message and get a response.\"\"\"\n        self.messages.append({\"role\": \"user\", \"content\": user_message})\n\n        response = self.client.messages.create(\n            model=self.model,\n            max_tokens=kwargs.get(\"max_tokens\", 16000),\n            system=self.system,\n            messages=self.messages,\n            **kwargs\n        )\n\n        assistant_message = next(\n            (b.text for b in response.content if b.type == \"text\"), \"\"\n        )\n        self.messages.append({\"role\": \"assistant\", \"content\": assistant_message})\n\n        return assistant_message\n\n# Usage\nconversation = ConversationManager(\n    client=anthropic.Anthropic(),\n    model=\"claude-opus-4-8\",\n    system=\"You are a helpful assistant.\"\n)\n\nresponse1 = conversation.send(\"My name is Alice.\")\nresponse2 = conversation.send(\"What's my name?\")  # Claude remembers \"Alice\"\n```\n\n**Rules:**\n\n- Consecutive same-role messages are allowed — the API combines them into a single turn\n- First message must be `user`\n- `role: \"system\"` messages are allowed mid-conversation on supporting models (no beta header needed) — see § Mid-conversation system messages above\n\n---\n\n### Compaction (long conversations)\n\n> **Beta, Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6.** When conversations approach the 200K context window, compaction automatically summarizes earlier context server-side. The API returns a `compaction` block; you must pass it back on subsequent requests — append `response.content`, not just the text.\n\n```python\nimport anthropic\n\nclient = anthropic.Anthropic()\nmessages = []\n\ndef chat(user_message: str) -> str:\n    messages.append({\"role\": \"user\", \"content\": user_message})\n\n    response = client.beta.messages.create(\n        betas=[\"compact-2026-01-12\"],\n        model=\"claude-opus-4-8\",\n        max_tokens=16000,\n        messages=messages,\n        context_management={\n            \"edits\": [{\"type\": \"compact_20260112\"}]\n        }\n    )\n\n    # Append full content — compaction blocks must be preserved\n    messages.append({\"role\": \"assistant\", \"content\": response.content})\n\n    return next(block.text for block in response.content if block.type == \"text\")\n\n# Compaction triggers automatically when context grows large\nprint(chat(\"Help me build a Python web scraper\"))\nprint(chat(\"Add support for JavaScript-rendered pages\"))\nprint(chat(\"Now add rate limiting and error handling\"))\n```\n\n---\n\n## Stop Reasons\n\nThe `stop_reason` field in the response indicates why the model stopped generating:\n\n| Value | Meaning |\n|-------|---------|\n| `end_turn` | Claude finished its response naturally |\n| `max_tokens` | Hit the `max_tokens` limit — increase it or use streaming |\n| `stop_sequence` | Hit a custom stop sequence |\n| `tool_use` | Claude wants to call a tool — execute it and continue |\n| `pause_turn` | Model paused and can be resumed (agentic flows) |\n| `refusal` | Claude refused for safety reasons — check `stop_details` |\n\n### Structured Stop Details\n\nWhen `stop_reason` is `\"refusal\"`, the response includes a `stop_details` object with structured information about the refusal:\n\n```python\nif response.stop_reason == \"refusal\" and response.stop_details:\n    print(f\"Category: {response.stop_details.category}\")   # e.g. \"cyber\", \"bio\", \"reasoning_extraction\", \"frontier_llm\", or None — see docs for the full set\n    print(f\"Explanation: {response.stop_details.explanation}\")\n```\n\n### Refusal Fallbacks (Claude Fable 5) — opt in by default\n\nFallbacks are **opt-in**: without them a refused request simply stops. Include the server-side `fallbacks` parameter in `claude-fable-5` code by default — on a policy decline the API re-runs the same request on the fallback model inside the same call. A decline before any output isn't billed (a mid-stream decline bills the streamed partial); the rescue bills at the fallback model's own rates, with cache repricing applied automatically.\n\n```python\nresponse = client.beta.messages.create(\n    model=\"claude-fable-5\",\n    max_tokens=16000,\n    betas=[\"server-side-fallback-2026-06-01\"],\n    fallbacks=[{\"model\": \"claude-opus-4-8\"}],\n    messages=[{\"role\": \"user\", \"content\": \"...\"}],\n)\n\n# Switch points: one fallback block per model that ran and declined this turn\nfor block in response.content:\n    if block.type == \"fallback\":\n        print(f\"{block.from_.model} declined; {block.to.model} continued\")\n\n# Served-by signal — covers sticky turns, which carry no fallback block.\n# Pair with stop_reason: the fallback model can itself refuse.\nfallback_ran = any(\n    entry.type == \"fallback_message\" for entry in response.usage.iterations or []\n)\nif fallback_ran and response.stop_reason != \"refusal\":\n    print(f\"Served by {response.model}\")\n```\n\nA `stop_reason: \"refusal\"` on the final response means the whole chain refused. The header must be exactly `server-side-fallback-2026-06-01`; the parameter is rejected on the Batches API and unavailable on Amazon Bedrock, Vertex AI, and Microsoft Foundry — register the client-side `BetaRefusalFallbackMiddleware` on the client there instead. Full semantics (sticky routing, billing, streaming, echoing fallback turns back): `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Cost Optimization Strategies\n\n### 1. Use Prompt Caching for Repeated Context\n\n```python\n# Automatic caching (simplest — caches the last cacheable block)\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    cache_control={\"type\": \"ephemeral\"},\n    system=large_document_text,  # e.g., 50KB of context\n    messages=[{\"role\": \"user\", \"content\": \"Summarize the key points\"}]\n)\n\n# First request: full cost\n# Subsequent requests: ~90% cheaper for cached portion\n```\n\n### 2. Choose the Right Model\n\n```python\n# Default to Opus for most tasks\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",  # $5.00/$25.00 per 1M tokens\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Explain quantum computing\"}]\n)\n\n# Use Sonnet for high-volume production workloads\nstandard_response = client.messages.create(\n    model=\"claude-sonnet-5\",  # $3.00/$15.00 per 1M tokens\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Summarize this document\"}]\n)\n\n# Use Haiku only for simple, speed-critical tasks\nsimple_response = client.messages.create(\n    model=\"claude-haiku-4-5\",  # $1.00/$5.00 per 1M tokens\n    max_tokens=256,\n    messages=[{\"role\": \"user\", \"content\": \"Classify this as positive or negative\"}]\n)\n```\n\n### 3. Use Token Counting Before Requests\n\n```python\ncount_response = client.messages.count_tokens(\n    model=\"claude-opus-4-8\",\n    messages=messages,\n    system=system\n)\n\nestimated_input_cost = count_response.input_tokens * 0.000005  # $5/1M tokens\nprint(f\"Estimated input cost: ${estimated_input_cost:.4f}\")\n```\n\n---\n\n## Retry with Exponential Backoff\n\n> **Note:** The Anthropic SDK automatically retries rate limit (429) and server errors (5xx) with exponential backoff. You can configure this with `max_retries` (default: 2). Only implement custom retry logic if you need behavior beyond what the SDK provides.\n\n```python\nimport time\nimport random\nimport anthropic\n\ndef call_with_retry(\n    client: anthropic.Anthropic,\n    max_retries: int = 5,\n    base_delay: float = 1.0,\n    max_delay: float = 60.0,\n    **kwargs\n):\n    \"\"\"Call the API with exponential backoff retry.\"\"\"\n    last_exception = None\n\n    for attempt in range(max_retries):\n        try:\n            return client.messages.create(**kwargs)\n        except anthropic.RateLimitError as e:\n            last_exception = e\n        except anthropic.APIStatusError as e:\n            if e.status_code >= 500:\n                last_exception = e\n            else:\n                raise  # Client errors (4xx except 429) should not be retried\n\n        delay = min(base_delay * (2 ** attempt) + random.uniform(0, 1), max_delay)\n        print(f\"Retry {attempt + 1}/{max_retries} after {delay:.1f}s\")\n        time.sleep(delay)\n\n    raise last_exception\n```\n</doc>\n\n<doc path=\"python/claude-api/batches.md\">\n# Message Batches API — Python\n\nThe Batches API (`POST /v1/messages/batches`) processes Messages API requests asynchronously at 50% of standard prices.\n\n## Key Facts\n\n- Up to 100,000 requests or 256 MB per batch\n- Most batches complete within 1 hour; maximum 24 hours\n- Results available for 29 days after creation\n- 50% cost reduction on all token usage\n- All Messages API features supported (vision, tools, caching, etc.)\n\n---\n\n## Create a Batch\n\n```python\nimport anthropic\nfrom anthropic.types.message_create_params import MessageCreateParamsNonStreaming\nfrom anthropic.types.messages.batch_create_params import Request\n\nclient = anthropic.Anthropic()\n\nmessage_batch = client.messages.batches.create(\n    requests=[\n        Request(\n            custom_id=\"request-1\",\n            params=MessageCreateParamsNonStreaming(\n                model=\"claude-opus-4-8\",\n                max_tokens=16000,\n                messages=[{\"role\": \"user\", \"content\": \"Summarize climate change impacts\"}]\n            )\n        ),\n        Request(\n            custom_id=\"request-2\",\n            params=MessageCreateParamsNonStreaming(\n                model=\"claude-opus-4-8\",\n                max_tokens=16000,\n                messages=[{\"role\": \"user\", \"content\": \"Explain quantum computing basics\"}]\n            )\n        ),\n    ]\n)\n\nprint(f\"Batch ID: {message_batch.id}\")\nprint(f\"Status: {message_batch.processing_status}\")\n```\n\n---\n\n## Poll for Completion\n\n```python\nimport time\n\nwhile True:\n    batch = client.messages.batches.retrieve(message_batch.id)\n    if batch.processing_status == \"ended\":\n        break\n    print(f\"Status: {batch.processing_status}, processing: {batch.request_counts.processing}\")\n    time.sleep(60)\n\nprint(\"Batch complete!\")\nprint(f\"Succeeded: {batch.request_counts.succeeded}\")\nprint(f\"Errored: {batch.request_counts.errored}\")\n```\n\n---\n\n## Retrieve Results\n\n> **Note:** Examples below use `match/case` syntax, requiring Python 3.10+. For earlier versions, use `if/elif` chains instead.\n\n```python\nfor result in client.messages.batches.results(message_batch.id):\n    match result.result.type:\n        case \"succeeded\":\n            msg = result.result.message\n            text = next((b.text for b in msg.content if b.type == \"text\"), \"\")\n            print(f\"[{result.custom_id}] {text[:100]}\")\n        case \"errored\":\n            if result.result.error.type == \"invalid_request\":\n                print(f\"[{result.custom_id}] Validation error - fix request and retry\")\n            else:\n                print(f\"[{result.custom_id}] Server error - safe to retry\")\n        case \"canceled\":\n            print(f\"[{result.custom_id}] Canceled\")\n        case \"expired\":\n            print(f\"[{result.custom_id}] Expired - resubmit\")\n```\n\n---\n\n## Cancel a Batch\n\n```python\ncancelled = client.messages.batches.cancel(message_batch.id)\nprint(f\"Status: {cancelled.processing_status}\")  # \"canceling\"\n```\n\n---\n\n## List Batches (auto-pagination)\n\nIterating the return value of any `list()` call auto-paginates across all pages — do not index into `.data` if you want the full set:\n\n```python\nfor batch in client.messages.batches.list(limit=20):\n    print(batch.id, batch.processing_status)\n```\n\nFor manual control, use `first_page.has_next_page()` / `first_page.get_next_page()` / `first_page.next_page_info()`; `first_page.data` holds the current page's items and `first_page.last_id` is the cursor.\n\n---\n\n## Batch with Prompt Caching\n\n```python\nshared_system = [\n    {\"type\": \"text\", \"text\": \"You are a literary analyst.\"},\n    {\n        \"type\": \"text\",\n        \"text\": large_document_text,  # Shared across all requests\n        \"cache_control\": {\"type\": \"ephemeral\"}\n    }\n]\n\nmessage_batch = client.messages.batches.create(\n    requests=[\n        Request(\n            custom_id=f\"analysis-{i}\",\n            params=MessageCreateParamsNonStreaming(\n                model=\"claude-opus-4-8\",\n                max_tokens=16000,\n                system=shared_system,\n                messages=[{\"role\": \"user\", \"content\": question}]\n            )\n        )\n        for i, question in enumerate(questions)\n    ]\n)\n```\n\n---\n\n## Full End-to-End Example\n\n```python\nimport anthropic\nimport time\nfrom anthropic.types.message_create_params import MessageCreateParamsNonStreaming\nfrom anthropic.types.messages.batch_create_params import Request\n\nclient = anthropic.Anthropic()\n\n# 1. Prepare requests\nitems_to_classify = [\n    \"The product quality is excellent!\",\n    \"Terrible customer service, never again.\",\n    \"It's okay, nothing special.\",\n]\n\nrequests = [\n    Request(\n        custom_id=f\"classify-{i}\",\n        params=MessageCreateParamsNonStreaming(\n            model=\"claude-haiku-4-5\",\n            max_tokens=50,\n            messages=[{\n                \"role\": \"user\",\n                \"content\": f\"Classify as positive/negative/neutral (one word): {text}\"\n            }]\n        )\n    )\n    for i, text in enumerate(items_to_classify)\n]\n\n# 2. Create batch\nbatch = client.messages.batches.create(requests=requests)\nprint(f\"Created batch: {batch.id}\")\n\n# 3. Wait for completion\nwhile True:\n    batch = client.messages.batches.retrieve(batch.id)\n    if batch.processing_status == \"ended\":\n        break\n    time.sleep(10)\n\n# 4. Collect results\nresults = {}\nfor result in client.messages.batches.results(batch.id):\n    if result.result.type == \"succeeded\":\n        msg = result.result.message\n        results[result.custom_id] = next((b.text for b in msg.content if b.type == \"text\"), \"\")\n\nfor custom_id, classification in sorted(results.items()):\n    print(f\"{custom_id}: {classification}\")\n```\n</doc>\n\n<doc path=\"python/claude-api/files-api.md\">\n# Files API — Python\n\nThe Files API uploads files for use in Messages API requests. Reference files via `file_id` in content blocks, avoiding re-uploads across multiple API calls.\n\n**Beta:** Pass `betas=[\"files-api-2025-04-14\"]` in your API calls (the SDK sets the required header automatically).\n\n## Key Facts\n\n- Maximum file size: 500 MB\n- Total storage: 100 GB per organization\n- Files persist until deleted\n- File operations (upload, list, delete) are free; content used in messages is billed as input tokens\n- Not available on Amazon Bedrock or Google Vertex AI\n\n---\n\n## Upload a File\n\nThe `file` argument accepts a `(filename, content, content_type)` tuple, a `pathlib.Path` (or any `PathLike` — read for you, async-safe with `AsyncAnthropic`), or an open binary file object.\n\n```python\nimport anthropic\nfrom pathlib import Path\n\nclient = anthropic.Anthropic()\n\nuploaded = client.beta.files.upload(\n    file=(\"report.pdf\", open(\"report.pdf\", \"rb\"), \"application/pdf\"),\n)\n# or: client.beta.files.upload(file=Path(\"report.pdf\"))\nprint(f\"File ID: {uploaded.id}\")\nprint(f\"Size: {uploaded.size_bytes} bytes\")\n```\n\n---\n\n## Use a File in Messages\n\n### PDF / Text Document\n\n```python\nresponse = client.beta.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            {\"type\": \"text\", \"text\": \"Summarize the key findings in this report.\"},\n            {\n                \"type\": \"document\",\n                \"source\": {\"type\": \"file\", \"file_id\": uploaded.id},\n                \"title\": \"Q4 Report\",           # optional\n                \"citations\": {\"enabled\": True}   # optional, enables citations\n            }\n        ]\n    }],\n    betas=[\"files-api-2025-04-14\"],\n)\nfor block in response.content:\n    if block.type == \"text\":\n        print(block.text)\n```\n\n### Image\n\n```python\nimage_file = client.beta.files.upload(\n    file=(\"photo.png\", open(\"photo.png\", \"rb\"), \"image/png\"),\n)\n\nresponse = client.beta.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            {\"type\": \"text\", \"text\": \"What's in this image?\"},\n            {\n                \"type\": \"image\",\n                \"source\": {\"type\": \"file\", \"file_id\": image_file.id}\n            }\n        ]\n    }],\n    betas=[\"files-api-2025-04-14\"],\n)\n```\n\n---\n\n## Manage Files\n\n### List Files\n\nIterate the list result directly — the SDK auto-paginates across all pages. Only use `.data` if you want the first page only.\n\n```python\nfor f in client.beta.files.list():\n    print(f\"{f.id}: {f.filename} ({f.size_bytes} bytes)\")\n```\n\n### Get File Metadata\n\n```python\nfile_info = client.beta.files.retrieve_metadata(\"file_011CNha8iCJcU1wXNR6q4V8w\")\nprint(f\"Filename: {file_info.filename}\")\nprint(f\"MIME type: {file_info.mime_type}\")\n```\n\n### Delete a File\n\n```python\nclient.beta.files.delete(\"file_011CNha8iCJcU1wXNR6q4V8w\")\n```\n\n### Download a File\n\nOnly files created by the code execution tool or skills can be downloaded (not user-uploaded files).\n\n```python\nfile_content = client.beta.files.download(\"file_011CNha8iCJcU1wXNR6q4V8w\")\nfile_content.write_to_file(\"output.txt\")\n```\n\n---\n\n## Full End-to-End Example\n\nUpload a document once, ask multiple questions about it:\n\n```python\nimport anthropic\n\nclient = anthropic.Anthropic()\n\n# 1. Upload once\nuploaded = client.beta.files.upload(\n    file=(\"contract.pdf\", open(\"contract.pdf\", \"rb\"), \"application/pdf\"),\n)\nprint(f\"Uploaded: {uploaded.id}\")\n\n# 2. Ask multiple questions using the same file_id\nquestions = [\n    \"What are the key terms and conditions?\",\n    \"What is the termination clause?\",\n    \"Summarize the payment schedule.\",\n]\n\nfor question in questions:\n    response = client.beta.messages.create(\n        model=\"claude-opus-4-8\",\n        max_tokens=16000,\n        messages=[{\n            \"role\": \"user\",\n            \"content\": [\n                {\"type\": \"text\", \"text\": question},\n                {\n                    \"type\": \"document\",\n                    \"source\": {\"type\": \"file\", \"file_id\": uploaded.id}\n                }\n            ]\n        }],\n        betas=[\"files-api-2025-04-14\"],\n    )\n    print(f\"\\nQ: {question}\")\n    text = next((b.text for b in response.content if b.type == \"text\"), \"\")\n    print(f\"A: {text[:200]}\")\n\n# 3. Clean up when done\nclient.beta.files.delete(uploaded.id)\n```\n</doc>\n\n<doc path=\"python/claude-api/streaming.md\">\n# Streaming — Python\n\n## Quick Start\n\n```python\nwith client.messages.stream(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    messages=[{\"role\": \"user\", \"content\": \"Write a story\"}]\n) as stream:\n    for text in stream.text_stream:\n        print(text, end=\"\", flush=True)\n```\n\n### Async\n\n```python\nasync with async_client.messages.stream(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    messages=[{\"role\": \"user\", \"content\": \"Write a story\"}]\n) as stream:\n    async for text in stream.text_stream:\n        print(text, end=\"\", flush=True)\n```\n\n### Low-level: `stream=True`\n\n`messages.stream()` (above) is the recommended helper — it accumulates state and exposes `text_stream` / `get_final_message()`. If you only need the raw event iterator and want lower memory use, pass `stream=True` to `messages.create()` instead:\n\n```python\nfor event in client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    messages=[{\"role\": \"user\", \"content\": \"Write a story\"}],\n    stream=True,\n):\n    print(event.type)\n```\n\nNo final-message accumulation is done for you in this form.\n\n---\n\n## Handling Different Content Types\n\nClaude may return text, thinking blocks, or tool use. Handle each appropriately:\n\n> **Fable 5 / Opus 4.8 / Opus 4.7 / Opus 4.6:** Use `thinking: {type: \"adaptive\"}`. On older models, use `thinking: {type: \"enabled\", budget_tokens: N}` instead.\n\n```python\nwith client.messages.stream(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    thinking={\"type\": \"adaptive\", \"display\": \"summarized\"},  # display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n    messages=[{\"role\": \"user\", \"content\": \"Analyze this problem\"}]\n) as stream:\n    for event in stream:\n        if event.type == \"content_block_start\":\n            if event.content_block.type == \"thinking\":\n                print(\"\\n[Thinking...]\")\n            elif event.content_block.type == \"text\":\n                print(\"\\n[Response:]\")\n\n        elif event.type == \"content_block_delta\":\n            if event.delta.type == \"thinking_delta\":\n                print(event.delta.thinking, end=\"\", flush=True)\n            elif event.delta.type == \"text_delta\":\n                print(event.delta.text, end=\"\", flush=True)\n```\n\n---\n\n## Streaming with Tool Use\n\nThe Python tool runner currently returns complete messages. Use streaming for individual API calls within a manual loop if you need per-token streaming with tools:\n\n```python\nwith client.messages.stream(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    tools=tools,\n    messages=messages\n) as stream:\n    for text in stream.text_stream:\n        print(text, end=\"\", flush=True)\n\n    response = stream.get_final_message()\n    # Continue with tool execution if response.stop_reason == \"tool_use\"\n```\n\n---\n\n## Getting the Final Message\n\n```python\nwith client.messages.stream(\n    model=\"claude-opus-4-8\",\n    max_tokens=64000,\n    messages=[{\"role\": \"user\", \"content\": \"Hello\"}]\n) as stream:\n    for text in stream.text_stream:\n        print(text, end=\"\", flush=True)\n\n    # Get full message after streaming\n    final_message = stream.get_final_message()\n    print(f\"\\n\\nTokens used: {final_message.usage.output_tokens}\")\n```\n\n---\n\n## Streaming with Progress Updates\n\n```python\ndef stream_with_progress(client, **kwargs):\n    \"\"\"Stream a response with progress updates.\"\"\"\n    total_tokens = 0\n    content_parts = []\n\n    with client.messages.stream(**kwargs) as stream:\n        for event in stream:\n            if event.type == \"content_block_delta\":\n                if event.delta.type == \"text_delta\":\n                    text = event.delta.text\n                    content_parts.append(text)\n                    print(text, end=\"\", flush=True)\n\n            elif event.type == \"message_delta\":\n                if event.usage and event.usage.output_tokens is not None:\n                    total_tokens = event.usage.output_tokens\n\n        final_message = stream.get_final_message()\n\n    print(f\"\\n\\n[Tokens used: {total_tokens}]\")\n    return \"\".join(content_parts)\n```\n\n---\n\n## Error Handling in Streams\n\n```python\ntry:\n    with client.messages.stream(\n        model=\"claude-opus-4-8\",\n        max_tokens=64000,\n        messages=[{\"role\": \"user\", \"content\": \"Write a story\"}]\n    ) as stream:\n        for text in stream.text_stream:\n            print(text, end=\"\", flush=True)\nexcept anthropic.APIConnectionError:\n    print(\"\\nConnection lost. Please retry.\")\nexcept anthropic.RateLimitError:\n    print(\"\\nRate limited. Please wait and retry.\")\nexcept anthropic.APIStatusError as e:\n    print(f\"\\nAPI error: {e.status_code}\")\n```\n\n---\n\n## Stream Event Types\n\n| Event Type            | Description                 | When it fires                     |\n| --------------------- | --------------------------- | --------------------------------- |\n| `message_start`       | Contains message metadata   | Once at the beginning             |\n| `content_block_start` | New content block beginning | When a text/tool_use block starts |\n| `content_block_delta` | Incremental content update  | For each token/chunk              |\n| `content_block_stop`  | Content block complete      | When a block finishes             |\n| `message_delta`       | Message-level updates       | Contains `stop_reason`, usage     |\n| `message_stop`        | Message complete            | Once at the end                   |\n\n## Best Practices\n\n1. **Always flush output** — Use `flush=True` to show tokens immediately\n2. **Handle partial responses** — If the stream is interrupted, you may have incomplete content\n3. **Track token usage** — The `message_delta` event contains usage information\n4. **Use timeouts** — Set appropriate timeouts for your application\n5. **Default to streaming** — Use `.get_final_message()` to get the complete response even when streaming, giving you timeout protection without needing to handle individual events\n6. **Large `max_tokens` without streaming raises `ValueError`** — The SDK refuses non-streaming requests it estimates will exceed ~10 minutes (idle connections drop). Pass `stream=True` / use `messages.stream()`, or explicitly override `timeout`, to suppress the guard.\n</doc>\n\n<doc path=\"python/claude-api/tool-use.md\">\n# Tool Use — Python\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Runner (Recommended)\n\n**Beta:** The tool runner is in beta in the Python SDK.\n\nUse the `@beta_tool` decorator to define tools as typed functions, then pass them to `client.beta.messages.tool_runner()`:\n\n```python\nimport anthropic\nfrom anthropic import beta_tool\n\nclient = anthropic.Anthropic()\n\n@beta_tool\ndef get_weather(location: str, unit: str = \"celsius\") -> str:\n    \"\"\"Get current weather for a location.\n\n    Args:\n        location: City and state, e.g., San Francisco, CA.\n        unit: Temperature unit, either \"celsius\" or \"fahrenheit\".\n    \"\"\"\n    # Your implementation here\n    return f\"72°F and sunny in {location}\"\n\n# The tool runner handles the agentic loop automatically\nrunner = client.beta.messages.tool_runner(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    tools=[get_weather],\n    messages=[{\"role\": \"user\", \"content\": \"What's the weather in Paris?\"}],\n)\n\n# Each iteration yields a BetaMessage; iteration stops when Claude is done\nfor message in runner:\n    print(message)\n```\n\nFor async usage, use `@beta_async_tool` with `async def` functions.\n\n**Key benefits of the tool runner:**\n\n- No manual loop — the SDK handles calling tools and feeding results back\n- Type-safe tool inputs via decorators\n- Tool schemas are generated automatically from function signatures\n- Iteration stops automatically when Claude has no more tool calls\n\n---\n\n## MCP Tool Conversion Helpers\n\n**Beta.** Convert [MCP (Model Context Protocol)](https://modelcontextprotocol.io/) tools, prompts, and resources to Anthropic API types for use with the tool runner. Requires `pip install anthropic[mcp]` (Python 3.10+).\n\n> **Note:** The Claude API also supports an `mcp_servers` parameter that lets Claude connect directly to remote MCP servers. Use these helpers instead when you need local MCP servers, prompts, resources, or more control over the MCP connection.\n\n### MCP Tools with Tool Runner\n\n```python\nfrom anthropic import AsyncAnthropic\nfrom anthropic.lib.tools.mcp import async_mcp_tool\nfrom mcp import ClientSession\nfrom mcp.client.stdio import stdio_client, StdioServerParameters\n\nclient = AsyncAnthropic()\n\nasync with stdio_client(StdioServerParameters(command=\"mcp-server\")) as (read, write):\n    async with ClientSession(read, write) as mcp_client:\n        await mcp_client.initialize()\n\n        tools_result = await mcp_client.list_tools()\n        # tool_runner is sync — returns the runner, not a coroutine\n        runner = client.beta.messages.tool_runner(\n            model=\"claude-opus-4-8\",\n            max_tokens=16000,\n            messages=[{\"role\": \"user\", \"content\": \"Use the available tools\"}],\n            tools=[async_mcp_tool(t, mcp_client) for t in tools_result.tools],\n        )\n        async for message in runner:\n            print(message)\n```\n\nFor sync usage, use `mcp_tool` instead of `async_mcp_tool`.\n\n### MCP Prompts\n\n```python\nfrom anthropic.lib.tools.mcp import mcp_message\n\nprompt = await mcp_client.get_prompt(name=\"my-prompt\")\nresponse = await client.beta.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[mcp_message(m) for m in prompt.messages],\n)\n```\n\n### MCP Resources as Content\n\n```python\nfrom anthropic.lib.tools.mcp import mcp_resource_to_content\n\nresource = await mcp_client.read_resource(uri=\"file:///path/to/doc.txt\")\nresponse = await client.beta.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            mcp_resource_to_content(resource),\n            {\"type\": \"text\", \"text\": \"Summarize this document\"},\n        ],\n    }],\n)\n```\n\n### Upload MCP Resources as Files\n\n```python\nfrom anthropic.lib.tools.mcp import mcp_resource_to_file\n\nresource = await mcp_client.read_resource(uri=\"file:///path/to/data.json\")\nuploaded = await client.beta.files.upload(file=mcp_resource_to_file(resource))\n```\n\nConversion functions raise `UnsupportedMCPValueError` if an MCP value cannot be converted (e.g., unsupported content types like audio, unsupported MIME types).\n\n---\n\n## Manual Agentic Loop\n\nUse this when you need fine-grained control over the loop (e.g., custom logging, conditional tool execution, human-in-the-loop approval):\n\n```python\nimport anthropic\n\nclient = anthropic.Anthropic()\ntools = [...]  # Your tool definitions\nmessages = [{\"role\": \"user\", \"content\": user_input}]\n\n# Agentic loop: keep going until Claude stops calling tools\nwhile True:\n    response = client.messages.create(\n        model=\"claude-opus-4-8\",\n        max_tokens=16000,\n        tools=tools,\n        messages=messages\n    )\n\n    # If Claude is done (no more tool calls), break\n    if response.stop_reason == \"end_turn\":\n        break\n\n    # Server-side tool hit iteration limit; re-send to continue\n    if response.stop_reason == \"pause_turn\":\n        messages = [\n            {\"role\": \"user\", \"content\": user_input},\n            {\"role\": \"assistant\", \"content\": response.content},\n        ]\n        continue\n\n    # Extract tool use blocks from the response\n    tool_use_blocks = [b for b in response.content if b.type == \"tool_use\"]\n\n    # Append assistant's response (including tool_use blocks)\n    messages.append({\"role\": \"assistant\", \"content\": response.content})\n\n    # Execute each tool and collect results\n    tool_results = []\n    for tool in tool_use_blocks:\n        result = execute_tool(tool.name, tool.input)  # Your implementation\n        tool_results.append({\n            \"type\": \"tool_result\",\n            \"tool_use_id\": tool.id,  # Must match the tool_use block's id\n            \"content\": result\n        })\n\n    # Append tool results as a user message\n    messages.append({\"role\": \"user\", \"content\": tool_results})\n\n# Final response text\nfinal_text = next(b.text for b in response.content if b.type == \"text\")\n```\n\n---\n\n## Handling Tool Results\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    tools=tools,\n    messages=[{\"role\": \"user\", \"content\": \"What's the weather in Paris?\"}]\n)\n\nfor block in response.content:\n    if block.type == \"tool_use\":\n        tool_name = block.name\n        tool_input = block.input\n        tool_use_id = block.id\n\n        result = execute_tool(tool_name, tool_input)\n\n        followup = client.messages.create(\n            model=\"claude-opus-4-8\",\n            max_tokens=16000,\n            tools=tools,\n            messages=[\n                {\"role\": \"user\", \"content\": \"What's the weather in Paris?\"},\n                {\"role\": \"assistant\", \"content\": response.content},\n                {\n                    \"role\": \"user\",\n                    \"content\": [{\n                        \"type\": \"tool_result\",\n                        \"tool_use_id\": tool_use_id,\n                        \"content\": result\n                    }]\n                }\n            ]\n        )\n```\n\n---\n\n## Multiple Tool Calls\n\n```python\ntool_results = []\n\nfor block in response.content:\n    if block.type == \"tool_use\":\n        result = execute_tool(block.name, block.input)\n        tool_results.append({\n            \"type\": \"tool_result\",\n            \"tool_use_id\": block.id,\n            \"content\": result\n        })\n\n# Send all results back at once\nif tool_results:\n    followup = client.messages.create(\n        model=\"claude-opus-4-8\",\n        max_tokens=16000,\n        tools=tools,\n        messages=[\n            *previous_messages,\n            {\"role\": \"assistant\", \"content\": response.content},\n            {\"role\": \"user\", \"content\": tool_results}\n        ]\n    )\n```\n\n---\n\n## Error Handling in Tool Results\n\n```python\ntool_result = {\n    \"type\": \"tool_result\",\n    \"tool_use_id\": tool_use_id,\n    \"content\": \"Error: Location 'xyz' not found. Please provide a valid city name.\",\n    \"is_error\": True\n}\n```\n\n---\n\n## Tool Choice\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    tools=tools,\n    tool_choice={\"type\": \"tool\", \"name\": \"get_weather\"},  # Force specific tool\n    messages=[{\"role\": \"user\", \"content\": \"What's the weather in Paris?\"}]\n)\n```\n\n---\n\n## Code Execution\n\n### Basic Usage\n\n```python\nimport anthropic\n\nclient = anthropic.Anthropic()\n\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": \"Calculate the mean and standard deviation of [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\"\n    }],\n    tools=[{\n        \"type\": \"code_execution_20260120\",\n        \"name\": \"code_execution\"\n    }]\n)\n\nfor block in response.content:\n    if block.type == \"text\":\n        print(block.text)\n    elif block.type == \"bash_code_execution_tool_result\":\n        print(f\"stdout: {block.content.stdout}\")\n```\n\n### Upload Files for Analysis\n\n```python\n# 1. Upload a file\nuploaded = client.beta.files.upload(file=open(\"sales_data.csv\", \"rb\"))\n\n# 2. Pass to code execution via container_upload block\n# Code execution is GA; Files API is still beta (pass via extra_headers)\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    extra_headers={\"anthropic-beta\": \"files-api-2025-04-14\"},\n    messages=[{\n        \"role\": \"user\",\n        \"content\": [\n            {\"type\": \"text\", \"text\": \"Analyze this sales data. Show trends and create a visualization.\"},\n            {\"type\": \"container_upload\", \"file_id\": uploaded.id}\n        ]\n    }],\n    tools=[{\"type\": \"code_execution_20260120\", \"name\": \"code_execution\"}]\n)\n```\n\n### Retrieve Generated Files\n\n```python\nimport os\n\nOUTPUT_DIR = \"./claude_outputs\"\nos.makedirs(OUTPUT_DIR, exist_ok=True)\n\nfor block in response.content:\n    if block.type == \"bash_code_execution_tool_result\":\n        result = block.content\n        if result.type == \"bash_code_execution_result\" and result.content:\n            for file_ref in result.content:\n                if file_ref.type == \"bash_code_execution_output\":\n                    metadata = client.beta.files.retrieve_metadata(file_ref.file_id)\n                    file_content = client.beta.files.download(file_ref.file_id)\n                    # Use basename to prevent path traversal; validate result\n                    safe_name = os.path.basename(metadata.filename)\n                    if not safe_name or safe_name in (\".\", \"..\"):\n                        print(f\"Skipping invalid filename: {metadata.filename}\")\n                        continue\n                    output_path = os.path.join(OUTPUT_DIR, safe_name)\n                    file_content.write_to_file(output_path)\n                    print(f\"Saved: {output_path}\")\n```\n\n### Container Reuse\n\n```python\n# First request: set up environment\nresponse1 = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Install tabulate and create data.json with sample data\"}],\n    tools=[{\"type\": \"code_execution_20260120\", \"name\": \"code_execution\"}]\n)\n\n# Get container ID from response\ncontainer_id = response1.container.id\n\n# Second request: reuse the same container\nresponse2 = client.messages.create(\n    container=container_id,\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Read data.json and display as a formatted table\"}],\n    tools=[{\"type\": \"code_execution_20260120\", \"name\": \"code_execution\"}]\n)\n```\n\n### Response Structure\n\n```python\nfor block in response.content:\n    if block.type == \"text\":\n        print(block.text)  # Claude's explanation\n    elif block.type == \"server_tool_use\":\n        print(f\"Running: {block.name} - {block.input}\")  # What Claude is doing\n    elif block.type == \"bash_code_execution_tool_result\":\n        result = block.content\n        if result.type == \"bash_code_execution_result\":\n            if result.return_code == 0:\n                print(f\"Output: {result.stdout}\")\n            else:\n                print(f\"Error: {result.stderr}\")\n        else:\n            print(f\"Tool error: {result.error_code}\")\n    elif block.type == \"text_editor_code_execution_tool_result\":\n        print(f\"File operation: {block.content}\")\n```\n\n---\n\n## Memory Tool\n\n### Basic Usage\n\n```python\nimport anthropic\n\nclient = anthropic.Anthropic()\n\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Remember that my preferred language is Python.\"}],\n    tools=[{\"type\": \"memory_20250818\", \"name\": \"memory\"}],\n)\n```\n\n### SDK Memory Helper\n\nSubclass `BetaAbstractMemoryTool`:\n\n```python\nfrom anthropic.lib.tools import BetaAbstractMemoryTool\n\nclass MyMemoryTool(BetaAbstractMemoryTool):\n    def view(self, command): ...\n    def create(self, command): ...\n    def str_replace(self, command): ...\n    def insert(self, command): ...\n    def delete(self, command): ...\n    def rename(self, command): ...\n\nmemory = MyMemoryTool()\n\n# Use with tool runner\nrunner = client.beta.messages.tool_runner(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    tools=[memory],\n    messages=[{\"role\": \"user\", \"content\": \"Remember my preferences\"}],\n)\n\nfor message in runner:\n    print(message)\n```\n\nFor full implementation examples, use WebFetch:\n\n- `https://github.com/anthropics/anthropic-sdk-python/blob/main/examples/memory/basic.py`\n\n---\n\n## Structured Outputs\n\n### JSON Outputs (Pydantic — Recommended)\n\n```python\nfrom pydantic import BaseModel\nfrom typing import List\nimport anthropic\n\nclass ContactInfo(BaseModel):\n    name: str\n    email: str\n    plan: str\n    interests: List[str]\n    demo_requested: bool\n\nclient = anthropic.Anthropic()\n\nresponse = client.messages.parse(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": \"Extract: Jane Doe (jane@co.com) wants Enterprise, interested in API and SDKs, wants a demo.\"\n    }],\n    output_format=ContactInfo,\n)\n\n# response.parsed_output is a validated ContactInfo instance\ncontact = response.parsed_output\nprint(contact.name)           # \"Jane Doe\"\nprint(contact.interests)      # [\"API\", \"SDKs\"]\n```\n\n### Raw Schema\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\n        \"role\": \"user\",\n        \"content\": \"Extract info: John Smith (john@example.com) wants the Enterprise plan.\"\n    }],\n    output_config={\n        \"format\": {\n            \"type\": \"json_schema\",\n            \"schema\": {\n                \"type\": \"object\",\n                \"properties\": {\n                    \"name\": {\"type\": \"string\"},\n                    \"email\": {\"type\": \"string\"},\n                    \"plan\": {\"type\": \"string\"},\n                    \"demo_requested\": {\"type\": \"boolean\"}\n                },\n                \"required\": [\"name\", \"email\", \"plan\", \"demo_requested\"],\n                \"additionalProperties\": False\n            }\n        }\n    }\n)\n\nimport json\n# output_config.format guarantees the first block is text with valid JSON\ntext = next(b.text for b in response.content if b.type == \"text\")\ndata = json.loads(text)\n```\n\n### Strict Tool Use\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Book a flight to Tokyo for 2 passengers on March 15\"}],\n    tools=[{\n        \"name\": \"book_flight\",\n        \"description\": \"Book a flight to a destination\",\n        \"strict\": True,\n        \"input_schema\": {\n            \"type\": \"object\",\n            \"properties\": {\n                \"destination\": {\"type\": \"string\"},\n                \"date\": {\"type\": \"string\", \"format\": \"date\"},\n                \"passengers\": {\"type\": \"integer\", \"enum\": [1, 2, 3, 4, 5, 6, 7, 8]}\n            },\n            \"required\": [\"destination\", \"date\", \"passengers\"],\n            \"additionalProperties\": False\n        }\n    }]\n)\n```\n\n### Using Both Together\n\n```python\nresponse = client.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=16000,\n    messages=[{\"role\": \"user\", \"content\": \"Plan a trip to Paris next month\"}],\n    output_config={\n        \"format\": {\n            \"type\": \"json_schema\",\n            \"schema\": {\n                \"type\": \"object\",\n                \"properties\": {\n                    \"summary\": {\"type\": \"string\"},\n                    \"next_steps\": {\"type\": \"array\", \"items\": {\"type\": \"string\"}}\n                },\n                \"required\": [\"summary\", \"next_steps\"],\n                \"additionalProperties\": False\n            }\n        }\n    },\n    tools=[{\n        \"name\": \"search_flights\",\n        \"description\": \"Search for available flights\",\n        \"strict\": True,\n        \"input_schema\": {\n            \"type\": \"object\",\n            \"properties\": {\n                \"destination\": {\"type\": \"string\"},\n                \"date\": {\"type\": \"string\", \"format\": \"date\"}\n            },\n            \"required\": [\"destination\", \"date\"],\n            \"additionalProperties\": False\n        }\n    }]\n)\n```\n</doc>\n\n<doc path=\"python/managed-agents/README.md\">\n# Managed Agents — Python\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for Python. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the Python SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `agents.create` and pass it to every subsequent `sessions.create`; do not call `agents.create` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```bash\npip install anthropic\n```\n\n## Client Initialization\n\n```python\nimport anthropic\n\n# Default — resolves credentials from the environment:\n# ANTHROPIC_API_KEY, or ANTHROPIC_AUTH_TOKEN, or an `ant auth login` profile.\n# Prefer this for local dev; don't hardcode a key.\nclient = anthropic.Anthropic()\n\n# Explicit API key (only when you must inject a specific key)\nclient = anthropic.Anthropic(api_key=\"your-api-key\")\n```\n\n---\n\n## Create an Environment\n\n```python\nenvironment = client.beta.environments.create(\n    name=\"my-dev-env\",\n    config={\n        \"type\": \"cloud\",\n        \"networking\": {\"type\": \"unrestricted\"},\n    },\n)\nprint(environment.id)  # env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** `model`/`system`/`tools` live on the agent object, not the session. Always start with `agents.create()` — the session only takes `agent={\"type\": \"agent\", \"id\": agent.id}`.\n\n### Minimal\n\n```python\n# 1. Create the agent (reusable, versioned)\nagent = client.beta.agents.create(\n    name=\"Coding Assistant\",\n    model=\"claude-opus-4-8\",\n    tools=[{\"type\": \"agent_toolset_20260401\", \"default_config\": {\"enabled\": True}}],\n)\n\n# 2. Start a session\nsession = client.beta.sessions.create(\n    agent={\"type\": \"agent\", \"id\": agent.id, \"version\": agent.version},\n    environment_id=environment.id,\n)\nprint(session.id, session.status)\nprint(f\"Trace: https://platform.claude.com/workspaces/default/sessions/{session.id}\")\n```\n\n### With system prompt and custom tools\n\n```python\nimport os\n\nagent = client.beta.agents.create(\n    name=\"Code Reviewer\",\n    model=\"claude-opus-4-8\",\n    system=\"You are a senior code reviewer.\",\n    tools=[\n        {\"type\": \"agent_toolset_20260401\"},\n        {\n            \"type\": \"custom\",\n            \"name\": \"run_tests\",\n            \"description\": \"Run the test suite\",\n            \"input_schema\": {\n                \"type\": \"object\",\n                \"properties\": {\n                    \"test_path\": {\"type\": \"string\", \"description\": \"Path to test file\"}\n                },\n                \"required\": [\"test_path\"],\n            },\n        },\n    ],\n)\n\nsession = client.beta.sessions.create(\n    agent={\"type\": \"agent\", \"id\": agent.id, \"version\": agent.version},\n    environment_id=environment.id,\n    title=\"Code review session\",\n    resources=[\n        {\n            \"type\": \"github_repository\",\n            \"url\": \"https://github.com/owner/repo\",\n            \"mount_path\": \"/workspace/repo\",\n            \"authorization_token\": os.environ[\"GITHUB_TOKEN\"],\n            \"branch\": \"main\",\n        }\n    ],\n)\n```\n\n---\n\n## Send a User Message\n\n```python\nclient.beta.sessions.events.send(\n    session_id=session.id,\n    events=[\n        {\n            \"type\": \"user.message\",\n            \"content\": [{\"type\": \"text\", \"text\": \"Review the auth module\"}],\n        }\n    ],\n)\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n```python\nimport json\n\n# Stream-first: open stream, then send while stream is live\nwith client.beta.sessions.events.stream(\n    session_id=session.id,\n) as stream:\n    client.beta.sessions.events.send(\n        session_id=session.id,\n        events=[{\"type\": \"user.message\", \"content\": [{\"type\": \"text\", \"text\": \"...\"}]}],\n    )\n    for event in stream:\n        ...  # process events\n\n# Standalone stream iteration:\nwith client.beta.sessions.events.stream(\n    session_id=session.id,\n) as stream:\n    for event in stream:\n        if event.type == \"agent.message\":\n            for block in event.content:\n                if block.type == \"text\":\n                    print(block.text, end=\"\", flush=True)\n        elif event.type == \"agent.custom_tool_use\":\n            # Custom tool invocation — session is now idle\n            print(f\"\\nCustom tool call: {event.name}\")\n            print(f\"Input: {json.dumps(event.input)}\")\n            # Send result back (see below)\n        elif event.type == \"session.status_idle\":\n            print(\"\\n--- Agent idle ---\")\n        elif event.type == \"session.status_terminated\":\n            print(\"\\n--- Session terminated ---\")\n            break\n```\n\n---\n\n## Provide Custom Tool Result\n\n```python\nclient.beta.sessions.events.send(\n    session_id=session.id,\n    events=[\n        {\n            \"type\": \"user.custom_tool_result\",\n            \"custom_tool_use_id\": \"sevt_abc123\",\n            \"content\": [{\"type\": \"text\", \"text\": \"All 42 tests passed.\"}],\n        }\n    ],\n)\n```\n\n---\n\n## Poll Events\n\n```python\nevents = client.beta.sessions.events.list(\n    session_id=session.id,\n)\nfor event in events.data:\n    print(f\"{event.type}: {event.id}\")\n```\n\n> ⚠️ **Prefer the SDK over raw `requests`/`httpx`.** If you hand-roll a poll loop, don't assume `timeout=(5, 60)` or `httpx.Timeout(120)` caps total call duration — both are **per-chunk** read timeouts (reset on every byte), so a trickling response can block forever. For a hard wall-clock deadline, track `time.monotonic()` at the loop level and bail explicitly, or wrap with `asyncio.wait_for()`. See [Receiving Events](../../shared/managed-agents-events.md#receiving-events).\n\n---\n\n## Full Streaming Loop with Custom Tools\n\n```python\nimport json\n\n\ndef run_custom_tool(tool_name: str, tool_input: dict) -> str:\n    \"\"\"Execute a custom tool and return the result.\"\"\"\n    if tool_name == \"run_tests\":\n        # Your tool implementation here\n        return \"All tests passed.\"\n    return f\"Unknown tool: {tool_name}\"\n\n\ndef run_session(client, session_id: str):\n    \"\"\"Stream events and handle custom tool calls.\"\"\"\n    while True:\n        with client.beta.sessions.events.stream(\n            session_id=session_id,\n        ) as stream:\n            tool_calls = []\n            for event in stream:\n                if event.type == \"agent.message\":\n                    for block in event.content:\n                        if block.type == \"text\":\n                            print(block.text, end=\"\", flush=True)\n                elif event.type == \"agent.custom_tool_use\":\n                    tool_calls.append(event)\n                elif event.type == \"session.status_idle\":\n                    break\n                elif event.type == \"session.status_terminated\":\n                    return\n\n        if not tool_calls:\n            break\n\n        # Process custom tool calls\n        results = []\n        for call in tool_calls:\n            result = run_custom_tool(call.name, call.input)\n            results.append({\n                \"type\": \"user.custom_tool_result\",\n                \"custom_tool_use_id\": call.id,\n                \"content\": [{\"type\": \"text\", \"text\": result}],\n            })\n\n        client.beta.sessions.events.send(\n            session_id=session_id,\n            events=results,\n        )\n```\n\n---\n\n## Upload a File\n\n```python\nwith open(\"data.csv\", \"rb\") as f:\n    file = client.beta.files.upload(\n        file=f,\n    )\n\n# Use in a session\nsession = client.beta.sessions.create(\n    agent={\"type\": \"agent\", \"id\": agent.id, \"version\": agent.version},\n    environment_id=environment.id,\n    resources=[{\"type\": \"file\", \"file_id\": file.id, \"mount_path\": \"/workspace/data.csv\"}],\n)\n```\n\n---\n\n## List and Download Session Files\n\nList files the agent wrote to `/mnt/session/outputs/` during a session, then download them.\n\n```python\n# List files associated with a session\nfiles = client.beta.files.list(\n    scope_id=session.id,\n    betas=[\"managed-agents-2026-04-01\"],\n)\nfor f in files.data:\n    print(f.filename, f.size_bytes)\n    # Download each file and save to disk\n    file_content = client.beta.files.download(f.id)\n    file_content.write_to_file(f.filename)\n```\n\n> 💡 There's a brief indexing lag (~1–3s) between `session.status_idle` and output files appearing in `files.list`. Retry once or twice if the list is empty.\n\n---\n\n## Session Management\n\n```python\n# Get session details\nsession = client.beta.sessions.retrieve(session_id=\"sesn_011CZxAbc123Def456\")\nprint(session.status, session.usage)\n\n# List sessions\nsessions = client.beta.sessions.list()\n\n# Delete a session\nclient.beta.sessions.delete(session_id=\"sesn_011CZxAbc123Def456\")\n\n# Archive a session\nclient.beta.sessions.archive(session_id=\"sesn_011CZxAbc123Def456\")\n```\n\n---\n\n## MCP Server Integration\n\n```python\n# Agent declares MCP server (no auth here — auth goes in a vault)\nagent = client.beta.agents.create(\n    name=\"MCP Agent\",\n    model=\"claude-opus-4-8\",\n    mcp_servers=[\n        {\"type\": \"url\", \"name\": \"my-tools\", \"url\": \"https://my-mcp-server.example.com/sse\"},\n    ],\n    tools=[\n        {\"type\": \"agent_toolset_20260401\", \"default_config\": {\"enabled\": True}},\n        {\"type\": \"mcp_toolset\", \"mcp_server_name\": \"my-tools\"},\n    ],\n)\n\n# Session attaches vault(s) containing credentials for those MCP server URLs\nsession = client.beta.sessions.create(\n    agent=agent.id,\n    environment_id=environment.id,\n    vault_ids=[vault.id],\n)\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n</doc>\n\n<doc path=\"ruby/claude-api/README.md\">\n# Claude API — Ruby\n\n> **Note:** The Ruby SDK supports the Claude API. A tool runner is available in beta via `client.beta.messages.tool_runner()`. Agent SDK is not yet available for Ruby.\n\n## Installation\n\n```bash\ngem install anthropic\n```\n\n## Client Initialization\n\n```ruby\nrequire \"anthropic\"\n\n# Default (uses ANTHROPIC_API_KEY env var)\nclient = Anthropic::Client.new\n\n# Explicit API key\nclient = Anthropic::Client.new(api_key: \"your-api-key\")\n```\n\n---\n\n## Basic Message Request\n\n```ruby\nmessage = client.messages.create(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    { role: \"user\", content: \"What is the capital of France?\" }\n  ]\n)\n# content is an array of polymorphic block objects (TextBlock, ThinkingBlock,\n# ToolUseBlock, ...). .type is a Symbol — compare with :text, not \"text\".\n# .text raises NoMethodError on non-TextBlock entries.\nmessage.content.each do |block|\n  puts block.text if block.type == :text\nend\n```\n\n---\n\n## Extended Thinking\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking. `budget_tokens` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `thinking: { type: \"enabled\", budget_tokens: N }` (must be < `max_tokens`, min 1024).\n\n```ruby\nmessage = client.messages.create(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 16000,\n  thinking: { type: \"adaptive\" },\n  messages: [{ role: \"user\", content: \"Solve: 27 * 453\" }]\n)\n\nmessage.content.each do |block|\n  case block.type\n  when :thinking then puts \"Thinking: #{block.thinking}\"\n  when :text then puts \"Response: #{block.text}\"\n  end\nend\n```\n\n---\n\n## Prompt Caching\n\n`system_:` (trailing underscore — avoids shadowing `Kernel#system`) takes an array of text blocks; set `cache_control` on the last block. Plain hashes work via the `OrHash` type alias. For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.\n\n```ruby\nmessage = client.messages.create(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 16000,\n  system_: [\n    { type: \"text\", text: long_system_prompt, cache_control: { type: \"ephemeral\" } }\n  ],\n  messages: [{ role: \"user\", content: \"Summarize the key points\" }]\n)\n```\n\nFor 1-hour TTL: `cache_control: { type: \"ephemeral\", ttl: \"1h\" }`. There's also a top-level `cache_control:` on `messages.create` that auto-places on the last cacheable block.\n\nVerify hits via `message.usage.cache_creation_input_tokens` / `message.usage.cache_read_input_tokens`.\n\n---\n\n## Stop Details\n\nWhen `stop_reason` is `:refusal`, the response includes structured `stop_details`:\n\n```ruby\nif message.stop_reason == :refusal && message.stop_details\n  puts \"Category: #{message.stop_details.category}\"     # e.g. :cyber, :bio, :reasoning_extraction, :frontier_llm, or nil — see docs for the full set\n  puts \"Explanation: #{message.stop_details.explanation}\"\nend\n```\n\n**Refusal fallbacks (Claude Fable 5) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. New `claude-fable-5` code should include the server-side `fallbacks` parameter (beta header `server-side-fallback-2026-06-01`, `fallbacks: [{model: \"claude-opus-4-8\"}]` on the beta messages call) by default. The exact Ruby binding (and the client-side middleware for providers without server-side support) is not documented here — WebFetch the Ruby SDK repo's `examples/` from `shared/live-sources.md`; full semantics in `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Beta Features\n\n`betas:` is only valid on `client.beta.messages.create`, not the non-beta path.\n\n### Task budgets\n\n```ruby\nresponse = client.beta.messages.create(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 16000,\n  output_config: { task_budget: { type: :tokens, total: 64_000 } },\n  tools: [...],\n  messages: [...],\n  betas: [\"task-budgets-2026-03-13\"]\n)\n```\n\n---\n\n## Error Type\n\n`APIStatusError` exposes a `.type` field for programmatic error classification:\n\n```ruby\nbegin\n  client.messages.create(...)\nrescue Anthropic::Errors::APIStatusError => e\n  puts e.type  # :rate_limit_error, :overloaded_error, etc.\nend\n```\n</doc>\n\n<doc path=\"ruby/claude-api/streaming.md\">\n# Streaming — Ruby\n\n## Streaming\n\n```ruby\nstream = client.messages.stream(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 64000,\n  messages: [{ role: \"user\", content: \"Write a haiku\" }]\n)\n\nstream.text.each { |text| print(text) }\n```\n\n---\n</doc>\n\n<doc path=\"ruby/claude-api/tool-use.md\">\n# Tool Use — Ruby\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Use\n\nThe Ruby SDK supports tool use via raw JSON schema definitions and also provides a beta tool runner for automatic tool execution.\n\n### Tool Runner (Beta)\n\n```ruby\nclass GetWeatherInput < Anthropic::BaseModel\n  required :location, String, doc: \"City and state, e.g. San Francisco, CA\"\nend\n\nclass GetWeather < Anthropic::BaseTool\n  doc \"Get the current weather for a location\"\n\n  input_schema GetWeatherInput\n\n  def call(input)\n    \"The weather in #{input.location} is sunny and 72°F.\"\n  end\nend\n\nclient.beta.messages.tool_runner(\n  model: :\"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: [GetWeather.new],\n  messages: [{ role: \"user\", content: \"What's the weather in San Francisco?\" }]\n).each_message do |message|\n  puts message.content\nend\n```\n\n### Manual Loop\n\nSee the [shared tool use concepts](../../shared/tool-use-concepts.md) for the tool definition format and agentic loop pattern.\n\n---\n</doc>\n\n<doc path=\"ruby/managed-agents/README.md\">\n# Managed Agents — Ruby\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for Ruby. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the Ruby SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `client.beta.agents.create` and pass it to every subsequent `client.beta.sessions.create`; do not call `agents.create` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```bash\ngem install anthropic\n```\n\n## Client Initialization\n\n```ruby\nrequire \"anthropic\"\n\n# Default (uses ANTHROPIC_API_KEY env var)\nclient = Anthropic::Client.new\n\n# Explicit API key\nclient = Anthropic::Client.new(api_key: \"your-api-key\")\n```\n\n> ⚠️ **Trailing underscores:** The Ruby SDK uses `system_:` and `send_(` (trailing underscore) to avoid shadowing `Kernel#system` and `Kernel#send`. Use these forms throughout managed-agents code.\n\n---\n\n## Create an Environment\n\n```ruby\nenvironment = client.beta.environments.create(\n  name: \"my-dev-env\",\n  config: {\n    type: \"cloud\",\n    networking: {type: \"unrestricted\"}\n  }\n)\nputs \"Environment ID: #{environment.id}\" # env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** `model`/`system_`/`tools` live on the agent object, not the session. Always start with `client.beta.agents.create()` — the session takes either `agent: agent.id` or the typed hash form `agent: {type: \"agent\", id: agent.id, version: agent.version}`.\n\n### Minimal\n\n```ruby\n# 1. Create the agent (reusable, versioned)\nagent = client.beta.agents.create(\n  name: \"Coding Assistant\",\n  model: :\"claude-opus-4-8\",\n  system_: \"You are a helpful coding assistant.\",\n  tools: [{type: \"agent_toolset_20260401\"}]\n)\n\n# 2. Start a session\nsession = client.beta.sessions.create(\n  agent: {type: \"agent\", id: agent.id, version: agent.version},\n  environment_id: environment.id,\n  title: \"Quickstart session\"\n)\nputs \"Session ID: #{session.id}\"\nputs \"Trace: https://platform.claude.com/workspaces/default/sessions/#{session.id}\"\n```\n\n### Updating an Agent\n\nUpdates create new versions; the agent object is immutable per version.\n\n```ruby\nupdated_agent = client.beta.agents.update(\n  agent.id,\n  version: agent.version,\n  system_: \"You are a helpful coding agent. Always write tests.\"\n)\nputs \"New version: #{updated_agent.version}\"\n\n# List all versions\nclient.beta.agents.versions.list(agent.id).auto_paging_each do |version|\n  puts \"Version #{version.version}: #{version.updated_at.iso8601}\"\nend\n\n# Archive the agent\narchived = client.beta.agents.archive(agent.id)\nputs \"Archived at: #{archived.archived_at.iso8601}\"\n```\n\n---\n\n## Send a User Message\n\n```ruby\nclient.beta.sessions.events.send_(\n  session.id,\n  events: [{\n    type: \"user.message\",\n    content: [{type: \"text\", text: \"Review the auth module\"}]\n  }]\n)\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n```ruby\n# Open the stream first, then send the user message\nstream = client.beta.sessions.events.stream_events(session.id)\n\nclient.beta.sessions.events.send_(\n  session.id,\n  events: [{\n    type: \"user.message\",\n    content: [{type: \"text\", text: \"Summarize the repo README\"}]\n  }]\n)\n\nstream.each do |event|\n  case event.type\n  in :\"agent.message\"\n    event.content.each { |block| print block.text }\n  in :\"agent.tool_use\"\n    puts \"\\n[Using tool: #{event.name}]\"\n  in :\"session.status_idle\"\n    break\n  in :\"session.error\"\n    puts \"\\n[Error: #{event.error&.message || \"unknown\"}]\"\n    break\n  else\n    # ignore other event types\n  end\nend\n```\n\n> ℹ️ Event `.type` is a Symbol (compare with `:\"agent.message\"`, not `\"agent.message\"`).\n\n### Reconnecting and Tailing\n\nWhen reconnecting mid-session, list past events first to dedupe, then tail live events:\n\n```ruby\nrequire \"set\"\n\nstream = client.beta.sessions.events.stream_events(session.id)\n\n# Stream is open and buffering. List history before tailing live.\nseen_event_ids = Set.new\nclient.beta.sessions.events.list(session.id).auto_paging_each { |past| seen_event_ids << past.id }\n\n# Tail live events, skipping anything already seen\nstream.each do |event|\n  next if seen_event_ids.include?(event.id)\n  seen_event_ids << event.id\n  case event.type\n  in :\"agent.message\"\n    event.content.each { |block| print block.text }\n  in :\"session.status_idle\"\n    break\n  else\n    # ignore other event types\n  end\nend\n```\n\n---\n\n## Provide Custom Tool Result\n\n> ℹ️ The Ruby managed-agents bindings for `user.custom_tool_result` are not yet documented in this skill or in the apps source examples. Refer to `shared/managed-agents-events.md` for the wire format and the `anthropic` Ruby gem repository for the corresponding params.\n\n---\n\n## Poll Events\n\n```ruby\nclient.beta.sessions.events.list(session.id).auto_paging_each do |event|\n  puts \"#{event.type}: #{event.id}\"\nend\n```\n\n---\n\n## Upload a File\n\n```ruby\nrequire \"pathname\"\n\nfile = client.beta.files.upload(file: Pathname(\"data.csv\"))\nputs \"File ID: #{file.id}\"\n\n# Mount in a session\nsession = client.beta.sessions.create(\n  agent: agent.id,\n  environment_id: environment.id,\n  resources: [\n    {\n      type: \"file\",\n      file_id: file.id,\n      mount_path: \"/workspace/data.csv\"\n    }\n  ]\n)\n```\n\n### Add and Manage Resources on an Existing Session\n\n```ruby\n# Attach an additional file to an open session\nresource = client.beta.sessions.resources.add(\n  session.id,\n  type: \"file\",\n  file_id: file.id\n)\nputs resource.id # \"sesrsc_01ABC...\"\n\n# List resources on the session\nlisted = client.beta.sessions.resources.list(session.id)\nlisted.data.each { |entry| puts \"#{entry.id} #{entry.type}\" }\n\n# Detach a resource\nclient.beta.sessions.resources.delete(resource.id, session_id: session.id)\n```\n\n---\n\n## List and Download Session Files\n\n```ruby\nfiles = client.beta.files.list(scope_id: \"sesn_abc123\", betas: [\"managed-agents-2026-04-01\"])\ncontent = client.beta.files.download(files.data[0].id)\nFile.binwrite(\"output.txt\", content.read)\n```\n\n---\n\n## Session Management\n\n```ruby\n# List environments\nenvironments = client.beta.environments.list\n\n# Retrieve a specific environment\nenv = client.beta.environments.retrieve(environment.id)\n\n# Archive an environment (read-only, existing sessions continue)\nclient.beta.environments.archive(environment.id)\n\n# Delete an environment (only if no sessions reference it)\nclient.beta.environments.delete(environment.id)\n\n# Delete a session\nclient.beta.sessions.delete(session.id)\n```\n\n---\n\n## MCP Server Integration\n\n```ruby\n# Agent declares MCP server (no auth here — auth goes in a vault)\nagent = client.beta.agents.create(\n  name: \"GitHub Assistant\",\n  model: :\"claude-opus-4-8\",\n  mcp_servers: [\n    {\n      type: \"url\",\n      name: \"github\",\n      url: \"https://api.githubcopilot.com/mcp/\"\n    }\n  ],\n  tools: [\n    {type: \"agent_toolset_20260401\"},\n    {type: \"mcp_toolset\", mcp_server_name: \"github\"}\n  ]\n)\n\n# Session attaches vault(s) containing credentials for those MCP server URLs\nsession = client.beta.sessions.create(\n  agent: {type: \"agent\", id: agent.id, version: agent.version},\n  environment_id: environment.id,\n  vault_ids: [vault.id]\n)\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n\n---\n\n## Vaults\n\n```ruby\n# Create a vault\nvault = client.beta.vaults.create(\n  display_name: \"Alice\",\n  metadata: {external_user_id: \"usr_abc123\"}\n)\nputs vault.id # \"vlt_01ABC...\"\n\n# Add an OAuth credential\ncredential = client.beta.vaults.credentials.create(\n  vault.id,\n  display_name: \"Alice's Slack\",\n  auth: {\n    type: \"mcp_oauth\",\n    mcp_server_url: \"https://mcp.slack.com/mcp\",\n    access_token: \"xoxp-...\",\n    expires_at: \"2026-04-15T00:00:00Z\",\n    refresh: {\n      token_endpoint: \"https://slack.com/api/oauth.v2.access\",\n      client_id: \"1234567890.0987654321\",\n      scope: \"channels:read chat:write\",\n      refresh_token: \"xoxe-1-...\",\n      token_endpoint_auth: {\n        type: \"client_secret_post\",\n        client_secret: \"abc123...\"\n      }\n    }\n  }\n)\n\n# Rotate the credential (e.g., after a token refresh)\nclient.beta.vaults.credentials.update(\n  credential.id,\n  vault_id: vault.id,\n  auth: {\n    type: \"mcp_oauth\",\n    access_token: \"xoxp-new-...\",\n    expires_at: \"2026-05-15T00:00:00Z\",\n    refresh: {refresh_token: \"xoxe-1-new-...\"}\n  }\n)\n\n# Archive a vault\nclient.beta.vaults.archive(vault.id)\n```\n\n---\n\n## GitHub Repository Integration\n\nMount a GitHub repository as a session resource (a vault holds the GitHub MCP credential):\n\n```ruby\nsession = client.beta.sessions.create(\n  agent: agent.id,\n  environment_id: environment.id,\n  vault_ids: [vault.id],\n  resources: [\n    {\n      type: \"github_repository\",\n      url: \"https://github.com/org/repo\",\n      mount_path: \"/workspace/repo\",\n      authorization_token: \"ghp_your_github_token\"\n    }\n  ]\n)\n```\n\nMultiple repositories on the same session:\n\n```ruby\nresources = [\n  {\n    type: \"github_repository\",\n    url: \"https://github.com/org/frontend\",\n    mount_path: \"/workspace/frontend\",\n    authorization_token: \"ghp_your_github_token\"\n  },\n  {\n    type: \"github_repository\",\n    url: \"https://github.com/org/backend\",\n    mount_path: \"/workspace/backend\",\n    authorization_token: \"ghp_your_github_token\"\n  }\n]\n```\n\nRotating a repository's authorization token:\n\n```ruby\nlisted = client.beta.sessions.resources.list(session.id)\nrepo_resource_id = listed.data.first.id\n\nclient.beta.sessions.resources.update(\n  repo_resource_id,\n  session_id: session.id,\n  authorization_token: \"ghp_your_new_github_token\"\n)\n```\n</doc>\n\n<doc path=\"shared/agent-design.md\">\n# Agent Design Patterns\n\nThis file covers decision heuristics for building agents on the Claude API: which primitives to reach for, how to design your tool surface, and how to manage context and cost over long runs. For per-tool mechanics and code examples, see `tool-use-concepts.md` and the language-specific folders.\n\n---\n\n## Model Parameters\n\n| Parameter | When to use it | What to expect |\n| --- | --- | --- |\n| **Adaptive thinking** (`thinking: {type: \"adaptive\"}`) | When you want Claude to control when and how much to think. | Claude determines thinking depth per request and automatically interleaves thinking between tool calls. No token budget to tune. |\n| **Effort** (`output_config: {effort: ...}`) | When adjusting the tradeoff between thoroughness and token efficiency. | Lower effort → fewer and more-consolidated tool calls, less preamble, terser confirmations. `medium` is often a favorable balance. Use `max` when correctness matters more than cost. |\n\nSee `SKILL.md` §Thinking & Effort for model support and parameter details.\n\n---\n\n## Designing Your Tool Surface\n\n### Bash vs. dedicated tools\n\nClaude doesn't know your application's security boundary, approval policy, or UX surface. Claude emits tool calls; your harness handles them. The shape of those tool calls determines what the harness can do.\n\nA **bash tool** gives Claude broad programmatic leverage — it can perform almost any action. But it gives the harness only an opaque command string, the same shape for every action. Promoting an action to a **dedicated tool** gives the harness an action-specific hook with typed arguments it can intercept, gate, render, or audit.\n\n**When to promote an action to a dedicated tool:**\n\n- **Security boundary.** Actions that require gating are natural candidates. Reversibility is a useful criterion: hard-to-reverse actions (external API calls, sending messages, deleting data) can be gated behind user confirmation. A `send_email` tool is easy to gate; `bash -c \"curl -X POST ...\"` is not.\n- **Staleness checks.** A dedicated `edit` tool can reject writes if the file changed since Claude last read it. Bash can't enforce that invariant.\n- **Rendering.** Some actions benefit from custom UI. Claude Code promotes question-asking to a tool so it can render as a modal, present options, and block the agent loop until answered.\n- **Scheduling.** Read-only tools like `glob` and `grep` can be marked parallel-safe. When the same actions run through bash, the harness can't tell a parallel-safe `grep` from a parallel-unsafe `git push`, so it must serialize.\n\n**Rule of thumb:** Start with bash for breadth. Promote to dedicated tools when you need to gate, render, audit, or parallelize the action.\n\n---\n\n## Anthropic-Provided Tools\n\n| Tool | Side | When to use it | What to expect |\n| --- | --- | --- | --- |\n| **Bash** | Client | Claude needs to execute shell commands. | Claude emits commands; your harness executes them. Reference implementation provided. |\n| **Text editor** | Client | Claude needs to read or edit files. | Claude views, creates, and edits files via your implementation. Reference implementation provided. |\n| **Computer use** | Client or Server | Claude needs to interact with GUIs, web apps, or visual interfaces. | Claude takes screenshots and issues mouse/keyboard commands. Can be self-hosted (you run the environment) or Anthropic-hosted. |\n| **Code execution** | Server | Claude needs to run code in a sandbox you don't want to manage. | Anthropic-hosted container with built-in file and bash sub-tools. No client-side execution. |\n| **Web search / fetch** | Server | Claude needs information past its training cutoff (news, current events, recent docs) or the content of a specific URL. | Claude issues a query or URL; Anthropic executes it and returns results with citations. |\n| **Memory** | Client | Claude needs to save context across sessions. | Claude reads/writes a `/memories` directory. You implement the storage backend. |\n\n**Client-side** tools are defined by Anthropic (name, schema, Claude's usage pattern) but executed by your harness. Anthropic provides reference implementations. **Server-side** tools run entirely on Anthropic infrastructure — declare them in `tools` and Claude handles the rest.\n\n---\n\n## Composing Tool Calls: Programmatic Tool Calling\n\nWith standard tool use, each tool call is a round trip: Claude calls the tool, the result lands in Claude's context, Claude reasons about it, then calls the next tool. Three sequential actions (read profile → look up orders → check inventory) means three round trips. Each adds latency and tokens, and most of the intermediate data is never needed again.\n\n**Programmatic tool calling (PTC)** lets Claude compose those calls into a script instead. The script runs in the code execution container. When the script calls a tool, the container pauses, the call is executed (client-side or server-side), and the result returns to the running code — not to Claude's context. The script processes it with normal control flow (loops, filters, branches). Only the script's final output returns to Claude.\n\n| When to use it | What to expect |\n| --- | --- |\n| Many sequential tool calls, or large intermediate results you want filtered before they hit the context window. | Claude writes code that invokes tools as functions. Runs in the code execution container. Token cost scales with final output, not intermediate results. |\n\n---\n\n## Scaling the Tool and Instruction Set\n\n| Feature | When to use it | What to expect |\n| --- | --- | --- |\n| **Tool search** | Many tools available, but only a few relevant per request. Don't want all schemas in context upfront. | Claude searches the tool set and loads only relevant schemas. Tool definitions are appended, not swapped — preserves cache (see Caching below). |\n| **Skills** | Task-specific instructions Claude should load only when relevant. | Each skill is a folder with a `SKILL.md`. The skill's description sits in context by default; Claude reads the full file when the task calls for it. |\n\nBoth patterns keep the fixed context small and load detail on demand.\n\n---\n\n## Long-Running Agents: Managing Context\n\n| Pattern | When to use it | What to expect |\n| --- | --- | --- |\n| **Context editing** | Context grows stale over many turns (old tool results, completed thinking). | Tool results and thinking blocks are cleared based on configurable thresholds. Keeps the transcript lean without summarizing. |\n| **Compaction** | Conversation likely to reach or exceed the context window limit. | Earlier context is summarized into a compaction block server-side. See `SKILL.md` §Compaction for the critical `response.content` handling. |\n| **Memory** | State must persist across sessions (not just within one conversation). | Claude reads/writes files in a memory directory. Survives process restarts. |\n\n**Choosing between them:** Context editing and compaction operate within a session — editing prunes stale turns, compaction summarizes when you're near the limit. Memory is for cross-session persistence. Many long-running agents use all three.\n\n---\n\n## Caching for Agents\n\n**Read `prompt-caching.md` first.** It covers the prefix-match invariant, breakpoint placement, the silent-invalidator audit, and why changing tools or models mid-session breaks the cache. This section covers only the agent-specific workarounds for those constraints.\n\n| Constraint (from `prompt-caching.md`) | Agent-specific workaround |\n| --- | --- |\n| Editing the system prompt mid-session invalidates the cache. | Append a `{\"role\": \"system\", ...}` message to `messages[]` instead (no beta header; on supporting models — see `prompt-caching.md` § Mid-conversation system messages). The cached prefix stays intact, and the model treats it as an operator-authority instruction rather than user text. On models that don't support it, fall back to a `<system-reminder>` text block in the user turn. |\n| Switching models mid-session invalidates the cache. | Spawn a **subagent** with the cheaper model for the sub-task; keep the main loop on one model. |\n| Adding/removing tools mid-session invalidates the cache. | Use **tool search** for dynamic discovery — it appends tool schemas rather than swapping them, so the existing prefix is preserved. |\n\nFor multi-turn breakpoint placement, use top-level auto-caching — see `prompt-caching.md` §Placement patterns.\n\n---\n\nFor live documentation on any of these features, see `live-sources.md`.\n</doc>\n\n<doc path=\"shared/anthropic-cli.md\">\n# Anthropic CLI (`ant`)\n\nThe `ant` CLI exposes every Claude API resource as a shell subcommand. Compared to `curl`: request bodies are built from typed flags or piped YAML instead of hand-written JSON, `@path` inlines file contents into any string field, `--transform` extracts fields with a GJSON path (no `jq`), list endpoints auto-paginate (cap total results with `--max-items N`; `--limit` only sets the server page size), and the `beta:` prefix auto-sets the right `anthropic-beta` header.\n\n## When to use the CLI vs the SDK\n\n**CLI for the control plane, SDK for the data plane.** Agents and environments are relatively static resources you define, configure, and debug with `ant` — check the YAML into your repo, apply from CI, inspect from a terminal. Sessions are dynamic and driven by your application through the SDK — create per task, stream events, react to tool calls, integrate into your product. Both hit the same API; the split is about where the call lives, not what's possible.\n\n| | Control plane → `ant` | Data plane → SDK |\n|---|---|---|\n| Resources | agents, environments, skills, vaults, files | sessions, events |\n| Cadence | Once per deploy / ad-hoc | Every task / every turn |\n| Lives in | `*.yaml` in your repo + CI + terminal | Application code |\n| Typical calls | `create < agent.yaml`, `update --version N`, `list`, `retrieve`, `archive`, `--debug` | `sessions.create()`, `events.stream()`, `events.send()` |\n\n## Install and auth\n\n```sh\n# macOS\nbrew install anthropics/tap/ant\nxattr -d com.apple.quarantine \"$(brew --prefix)/bin/ant\"\n\n# Linux / WSL — pick the release from github.com/anthropics/anthropic-cli/releases\ncurl -fsSL \"https://github.com/anthropics/anthropic-cli/releases/download/v${VERSION}/ant_${VERSION}_$(uname -s | tr A-Z a-z)_$(uname -m | sed -e s/x86_64/amd64/ -e s/aarch64/arm64/).tar.gz\" \\\n  | sudo tar -xz -C /usr/local/bin ant\n\n# Or from source (Go 1.22+)\ngo install github.com/anthropics/anthropic-cli/cmd/ant@latest\n```\n\n**Auth** — the CLI resolves credentials the same way the SDKs do (first match wins): explicit flags, then `ANTHROPIC_API_KEY`, then `ANTHROPIC_AUTH_TOKEN`, then the `ANTHROPIC_PROFILE`-selected or active profile, then Workload Identity Federation env vars, then the default profile on disk. Override the host with `ANTHROPIC_BASE_URL` or `--base-url`.\n\n- **API key**: set `ANTHROPIC_API_KEY` in the environment.\n- **OAuth profile** (no static key to manage): `ant auth login` opens a browser, exchanges for a short-lived token, and stores a profile under `$ANTHROPIC_CONFIG_DIR` (default `~/.config/anthropic/` on Linux/macOS, `%APPDATA%\\Anthropic` on Windows — `configs/<profile>.json` for settings, `credentials/<profile>.json` for tokens). Subsequent `ant` (and SDK) calls pick it up automatically — a bare `Anthropic()` client works after login, but scripts that read `ANTHROPIC_API_KEY` directly do not. Claude Code and the Claude Agent SDK honor the same profile resolution. `ant auth status` shows which credential source and profile won (it reports status only — don't script against its exit code as a health check); `ant auth logout` clears the active profile (`--all` for every profile). On a remote host without a browser, `ant auth login --no-browser` prints the authorize URL and accepts the code back in the terminal.\n- **Non-interactive workloads** (CI, servers, containers): interactive login is for development on your own machine — use Workload Identity Federation instead (see the authentication docs via `shared/live-sources.md`).\n\n> **The #1 auth trap:** profiles are only consulted when no API key is set. A stale exported `ANTHROPIC_API_KEY` silently overrides every profile — requests hit whatever org/workspace that key is scoped to. `ant auth status` shows which source won; unset the key (or per-command: `env -u ANTHROPIC_API_KEY ant …`) before relying on a profile. Truly **unset** it — an empty `ANTHROPIC_API_KEY=\"\"` still wins its precedence slot and authenticates with an empty key. The same shadowing applies in reverse to Claude Code: after `ant auth login`, Claude Code may warn about an auth conflict between the profile and its own `/login` credential — keep one (use the profile and `/logout` in Claude Code, or `ant auth logout` to keep Claude Code's own login).\n\n**Named profiles** — an interactive-login token is bound to a single org+workspace, and the API only shows resources belonging to that workspace. If an agent, session, or file you created \"disappears\", the usual cause is a token scoped to a different workspace than the one that created it (`ant auth status` shows the active workspace). Multi-workspace work means one profile per workspace:\n\n```sh\nant auth login --profile <name>                  # creates the profile if it doesn't exist; org/workspace picker in browser\nant auth login --profile <name> --workspace-id wrkspc_01...   # bind directly, skip the picker\nant profile activate <name>                      # switch the default profile\nant --profile <name> models list                 # one-off; equivalent: ANTHROPIC_PROFILE=<name> ant models list\nant profile list                                 # inspect\nant profile set workspace_id wrkspc_01... --profile <name>    # edit config keys (workspace_id, base_url, organization_id, …)\n```\n\n`ant profile set` edits an existing profile's config — it never creates one, and it does **not** rebind already-issued credentials; run `ant auth login` again under that profile to mint a token for the new target. Pointing `ANTHROPIC_PROFILE` at a profile that doesn't exist is an error, not a fall-through. Refresh tokens eventually hard-expire (they don't slide with use) — when a previously working profile starts failing auth, re-run `ant auth login` before debugging anything else.\n\n**Scopes** — a profile's OAuth scope set is requested at login (`--scope`) and persists on the profile (`scope` is also a `profile set` config key; like other config edits, changing it requires a fresh `ant auth login` to take effect). Privileged scopes — e.g. `org:admin` for organization-administration endpoints — are **not** in the default scope set: pass the full set you want explicitly (`ant auth login --profile admin --scope \"... org:admin\"`), and the server grants a privileged scope only if your role actually has it. Because the scope set rides on every token the profile mints, keep privileged work on a dedicated profile (`admin` vs `default`) and do day-to-day inference on the unprivileged one, switching with `--profile`/`ANTHROPIC_PROFILE`. Check `ant auth login --help` for the current scope list, and `ant auth status` to see what the active token carries.\n\nTo hand the active credential to a subprocess or raw-HTTP script:\n\n```sh\n# Bare access token — for curl's Authorization header\ncurl https://api.anthropic.com/v1/messages \\\n  -H \"Authorization: Bearer $(ant auth print-credentials --access-token)\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: oauth-2025-04-20\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"model\": \"claude-opus-4-8\", \"max_tokens\": 1024, \"messages\": [{\"role\": \"user\", \"content\": \"Hello\"}]}'\n\n# .env format — sets ANTHROPIC_AUTH_TOKEN (and ANTHROPIC_BASE_URL if the profile has one).\n# Output is bare KEY=value (no `export`), so use `set -a` to auto-export for child processes:\nset -a; eval \"$(ant auth print-credentials --env)\"; set +a\npython my_script.py   # SDK picks up ANTHROPIC_AUTH_TOKEN\n```\n\nOAuth tokens go on `Authorization: Bearer` (not `x-api-key:`) **plus the `anthropic-beta: oauth-2025-04-20` header** — converting a raw curl/httpx script from an API key is a header change, not a key swap. The beta header requirement is endpoint-dependent (some endpoints happen to work without it; `/v1/messages` does not) — always send it so requests don't break when you switch endpoints. The token is short-lived and not auto-refreshed when passed via env var, so re-run `print-credentials` before it expires for long-running scripts (`print-credentials` itself refreshes the token if needed). If both `ANTHROPIC_API_KEY` and `ANTHROPIC_AUTH_TOKEN` are set, the SDKs send both and the API rejects the request — unset `ANTHROPIC_API_KEY` before `eval`ing the `--env` output.\n\n**Foot-gun:** `ant auth print-credentials` with **no flags** prints the entire credentials JSON, not the bare token — putting that in an `Authorization` header yields an empty response or HTTP/2 protocol error. Always use `--access-token` for headers (it always reads the named/active profile; a set `ANTHROPIC_API_KEY` doesn't override credential printing).\n\n## Command structure\n\n```\nant <resource>[:<subresource>] <action> [flags]\n```\n\nBeta resources (agents, sessions, environments, deployments, skills, vaults, memory stores) live under `beta:` — the CLI auto-sends the right `anthropic-beta` header, so don't pass it yourself unless overriding with `--beta <header>`. For self-hosted environments, `ant beta:worker poll/run` and `ant beta:environments:work stats/stop` drive and monitor the work queue — see `shared/managed-agents-self-hosted-sandboxes.md`.\n\n```sh\nant models list\nant messages create --model claude-opus-4-8 --max-tokens 1024 --message '{role: user, content: \"Hello\"}'\nant beta:agents retrieve --agent-id agent_01...\nant beta:sessions:events list --session-id session_01...\n```\n\n`ant --help` lists resources; append `--help` to any subcommand for its flags.\n\n## Global flags\n\n| Flag | Purpose |\n| --- | --- |\n| `--format` | `auto` (default: pretty if TTY, compact if piped), `json`, `jsonl`, `yaml`, `pretty`, `raw`, `explore` (interactive TUI) |\n| `--transform` | GJSON path applied to the response (per-item on list endpoints). Not applied when `--format raw`. |\n| `-r`, `--raw-output` | If the transformed result is a string, print it without quotes (jq semantics). Pair with `--transform` for scalar capture. |\n| `--max-items` | Cap total results returned from auto-paginating list endpoints (distinct from `--limit`, which is the server page size). |\n| `--format-error` / `--transform-error` | Same as `--format`/`--transform`, applied to error responses. `-r` does not apply to the error path — use `--format-error yaml` for unquoted error scalars. |\n| `--base-url` | Override API host |\n| `--debug` | Print full HTTP request + response to stderr (API key redacted) |\n\n## Output — `--transform` + `--format`\n\n`--transform` takes a [GJSON path](https://github.com/tidwall/gjson/blob/master/SYNTAX.md). On list endpoints it runs **per item**, not on the envelope.\n\n```sh\nant beta:agents list --transform '{id,name,model}' --format jsonl\n```\n\n**Extract a scalar for shell use:** pair `--transform` with `-r` (`--raw-output` — prints strings unquoted, jq-style):\n\n```sh\nAGENT_ID=$(ant beta:agents create --name \"My Agent\" --model '{id: claude-sonnet-5}' \\\n  --transform id -r)\n```\n\n## Input — flags, stdin, `@file`\n\n**Flags** — scalar fields map directly. Structured fields accept relaxed-YAML syntax (unquoted keys) or strict JSON. Repeatable flags build arrays (each `--tool`, `--event`, `--message` appends one element):\n\n```sh\nant beta:agents create \\\n  --name \"Research Agent\" \\\n  --model '{id: claude-opus-4-8}' \\\n  --tool '{type: agent_toolset_20260401}' \\\n  --tool '{type: custom, name: search_docs, input_schema: {type: object, properties: {query: {type: string}}}}'\n```\n\n**Stdin** — pipe a full JSON or YAML body. Merged with flags; flags win on conflict (for array fields, any flag **replaces** the stdin array entirely — it does not append). Quote the heredoc delimiter (`<<'YAML'`) to disable shell expansion inside the body:\n\n```sh\nant beta:agents create <<'YAML'\nname: Research Agent\nmodel: claude-opus-4-8\nsystem: |\n  You are a research assistant. Cite sources for every claim.\ntools:\n  - type: agent_toolset_20260401\nYAML\n```\n\n**`@file` references** — inline a file's contents into any string-valued field. Inside structured flag values, quote the path. Binary files are auto-base64'd; force with `@file://` (text) or `@data://` (base64). Escape a literal leading `@` as `\\@`.\n\n```sh\nant beta:agents create --name \"Researcher\" --model '{id: claude-sonnet-5}' --system @./prompts/researcher.txt\n\nant messages create --model claude-opus-4-8 --max-tokens 1024 \\\n  --message '{role: user, content: [\n    {type: document, source: {type: base64, media_type: application/pdf, data: \"@./scan.pdf\"}},\n    {type: text, text: \"Extract the text from this scanned document.\"}\n  ]}' \\\n  --transform 'content.0.text' -r\n```\n\nFlags that natively take a file path (e.g. `--file` on `beta:files upload`) accept a bare path without `@`.\n\n## Version-controlled Managed Agents resources\n\nThis is the recommended flow for defining agents and environments — check the YAML into your repo and sync via `create` (first time) / `update` (thereafter). See `shared/managed-agents-core.md` for the field reference.\n\n```yaml\n# summarizer.agent.yaml\nname: Summarizer\nmodel: claude-sonnet-5\nsystem: |\n  You are a helpful assistant that writes concise summaries.\ntools:\n  - type: agent_toolset_20260401\n```\n\n```sh\n# Create (once) — capture the ID\nAGENT_ID=$(ant beta:agents create < summarizer.agent.yaml --transform id -r)\n\n# Update (CI) — needs ID + current version (optimistic lock)\nant beta:agents update --agent-id \"$AGENT_ID\" --version 1 < summarizer.agent.yaml\n```\n\nSame pattern for environments (`ant beta:environments create|update < env.yaml`), then start a session with both IDs:\n\n```sh\nant beta:sessions create --agent \"$AGENT_ID\" --environment-id \"$ENV_ID\" --title \"Task\"\nant beta:sessions:events send --session-id \"$SID\" \\\n  --event '{type: user.message, content: [{type: text, text: \"Summarize X\"}]}'\nant beta:sessions:events list --session-id \"$SID\" --transform 'content.0.text' -r\nant beta:sessions:events stream --session-id \"$SID\"   # live event stream\n```\n\n### Interactive session loop (stream-before-send)\n\n`ant beta:sessions:events stream` only delivers events emitted *after* the stream opens — so open it **before** sending the kickoff to avoid missing early events. Use process substitution to hold the stream on a file descriptor, send, then read:\n\n```sh\nexec {stream}< <(ant beta:sessions:events stream --session-id \"$SID\" \\\n  --transform '{type,text:content.#(type==\"text\").text,err:error.message}' --format yaml)\n\nant beta:sessions:events send --session-id \"$SID\" > /dev/null <<'YAML'\nevents:\n  - type: user.message\n    content:\n      - type: text\n        text: Summarize the repo README\nYAML\n\ntype=\nwhile IFS= read -r -u \"$stream\" line; do\n  case \"$line\" in\n    type:\\ session.status_idle) break ;;\n    type:\\ session.error)\n      IFS= read -r -u \"$stream\" next || next=\n      case \"$next\" in err:\\ *) msg=${next#err: } ;; *) msg=unknown ;; esac\n      printf '\\n[Error: %s]\\n' \"$msg\"; break ;;\n    type:\\ *) type=${line#type: } ;;\n    text:*)\n      [[ $type == agent.message ]] || continue\n      val=${line#text: }\n      case \"$val\" in '|-'|'|') ;; *) printf '%s' \"$val\" ;; esac ;;\n    \\ \\ *)\n      if [[ $type == agent.message ]]; then printf '%s\\n' \"${line#  }\"; fi ;;\n  esac\ndone\nexec {stream}<&-\n```\n\nThis works for interactive exploration and demos. For application code that needs to react to `agent.tool_use` / `agent.custom_tool_use` events, reconnect after drops, or dedup against `events.list`, use the SDK — see `shared/managed-agents-client-patterns.md`.\n\n## Scripting patterns\n\n`--transform id -r` on a list endpoint emits one bare ID per line — compose with `xargs`, or use `--max-items N` to bound the result set without piping through `head`:\n\n```sh\nFIRST=$(ant beta:agents list --transform id -r --max-items 1)\nant beta:agents:versions list --agent-id \"$FIRST\" --transform '{version,created_at}' --format jsonl\n```\n\nError shaping mirrors the success path (note: `-r` does not apply to error output — use `--format-error yaml` for an unquoted scalar here):\n\n```sh\nant beta:agents retrieve --agent-id bogus --transform-error error.message --format-error yaml 2>&1\n```\n\nShell completion: `ant @completion {zsh|bash|fish|powershell}`.\n\nFor the full, always-current reference (including per-endpoint flags), WebFetch the **Anthropic CLI** URL in `shared/live-sources.md`.\n</doc>\n\n<doc path=\"shared/claude-platform-on-aws.md\">\n# Claude Platform on AWS\n\n**Anthropic-operated** access to the Claude Developer Platform through AWS infrastructure — SigV4 authentication, AWS IAM access control, and AWS Marketplace billing. Because Anthropic operates it, **the API surface matches first-party with same-day parity** — for per-feature exceptions, see `shared/platform-availability.md` (the single source of truth; do not rely on an inline exception list here). Model IDs are the bare first-party strings (`claude-opus-4-8`, `claude-sonnet-5`) — **no provider prefix**.\n\n> **Not the same as Amazon Bedrock.** Bedrock is partner-operated (AWS runs the service; release schedules vary, feature subset, `anthropic.`-prefixed model IDs). Claude Platform on AWS and Bedrock coexist; pick by whether you need AWS-native IAM/billing with full Anthropic API parity (this page) vs. Bedrock's own ecosystem.\n\n---\n\n## Client & install\n\n| Language | Install | Client |\n|---|---|---|\n| Python | `pip install -U \"anthropic[aws]\"` | `from anthropic import AnthropicAWS` → `AnthropicAWS()` |\n| TypeScript | `npm install @anthropic-ai/aws-sdk` | `import AnthropicAws from \"@anthropic-ai/aws-sdk\"` → `new AnthropicAws()` |\n| Go | `go get github.com/anthropics/anthropic-sdk-go` | `import anthropicaws \"github.com/anthropics/anthropic-sdk-go/aws\"` → `anthropicaws.NewClient(ctx, anthropicaws.ClientConfig{})` |\n| C# | `dotnet add package Anthropic.Aws` | `new AnthropicAwsClient()` |\n| Java | See SDK repo in `shared/live-sources.md` | See SDK repo in `shared/live-sources.md` |\n| Ruby | `gem install anthropic aws-sdk-core` | See SDK repo in `shared/live-sources.md` |\n| PHP | `composer require anthropic-ai/sdk aws/aws-sdk-php` | See SDK repo in `shared/live-sources.md` |\n\nAfter construction, **use the client exactly as you would `Anthropic()`** — `client.messages.create(...)`, `client.beta.sessions.*`, etc., with bare model IDs.\n\n```python\nfrom anthropic import AnthropicAWS\n\nclient = AnthropicAWS()  # region + workspace_id from env; see below\nclient.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=1024,\n    messages=[{\"role\": \"user\", \"content\": \"Hello\"}],\n)\n```\n\n---\n\n## Required configuration\n\nTwo values must be available (constructor args or environment) — **there is no default fallback** for either:\n\n| Value | Env var | Notes |\n|---|---|---|\n| AWS region | `AWS_REGION` | Required. Unlike `AnthropicBedrock`, there is no `us-east-1` fallback. |\n| Workspace ID | `ANTHROPIC_AWS_WORKSPACE_ID` | Required. Routes requests to your Claude workspace. |\n\nEndpoint pattern: `https://aws-external-anthropic.{region}.api.aws/v1/...`. Requests are SigV4-signed with service name `aws-external-anthropic`.\n\n## Authentication\n\nThe client resolves AWS credentials via the standard precedence chain: explicit constructor args → environment (`AWS_ACCESS_KEY_ID`/`AWS_SECRET_ACCESS_KEY`/`AWS_SESSION_TOKEN`) → shared profile → assumed role / instance metadata.\n\n**Short-term API keys** are also supported for cases where SigV4 isn't practical (e.g., browser, simple scripts). Mint one with the per-language token-generator package; pass it as `api_key` on the client. Lifetime is the **lesser of** the requested duration, the underlying credential's expiry, and **12 hours**. For package names and IAM details, WebFetch the Claude Platform on AWS page in `shared/live-sources.md`.\n\n---\n\n## What to tell users\n\n- Treat it as first-party: every section of this skill applies unchanged. Do **not** apply Bedrock's feature-availability mask.\n- Model IDs are bare (`claude-opus-4-8`). Do **not** add an `anthropic.` prefix.\n- A missing region or `workspace_id` throws at client-construction time (no request is sent). A **403** means the request reached the server — check for a **wrong** `workspace_id` or a missing IAM action on the principal. See the IAM actions reference in `shared/live-sources.md`.\n</doc>\n\n<doc path=\"shared/error-codes.md\">\n# HTTP Error Codes Reference\n\nThis file documents HTTP error codes returned by the Claude API, their common causes, and how to handle them. For language-specific error handling examples, see the `python/` or `typescript/` folders.\n\n## Error Code Summary\n\n| Code | Error Type              | Retryable | Common Cause                         |\n| ---- | ----------------------- | --------- | ------------------------------------ |\n| 400  | `invalid_request_error` | No        | Invalid request format or parameters |\n| 401  | `authentication_error`  | No        | Invalid or missing API key           |\n| 403  | `permission_error`      | No        | API key lacks permission             |\n| 404  | `not_found_error`       | No        | Invalid endpoint or model ID         |\n| 413  | `request_too_large`     | No        | Request exceeds size limits          |\n| 429  | `rate_limit_error`      | Yes       | Too many requests                    |\n| 500  | `api_error`             | Yes       | Anthropic service issue              |\n| 529  | `overloaded_error`      | Yes       | API is temporarily overloaded        |\n\n## Detailed Error Information\n\n### 400 Bad Request\n\n**Causes:**\n\n- Malformed JSON in request body\n- Missing required parameters (`model`, `max_tokens`, `messages`)\n- Invalid parameter types (e.g., string where integer expected)\n- Empty messages array\n- Messages not alternating user/assistant\n\n**Example error:**\n\n```json\n{\n  \"type\": \"error\",\n  \"error\": {\n    \"type\": \"invalid_request_error\",\n    \"message\": \"messages: roles must alternate between \\\"user\\\" and \\\"assistant\\\"\"\n  },\n  \"request_id\": \"req_011CSHoEeqs5C35K2UUqR7Fy\"\n}\n```\n\n**Fix:** Validate request structure before sending. Check that:\n\n- `model` is a valid model ID\n- `max_tokens` is a positive integer\n- `messages` array is non-empty and alternates correctly\n\n---\n\n### 401 Unauthorized\n\n**Causes:**\n\n- Missing `x-api-key` header or `Authorization` header\n- Invalid API key format\n- Revoked or deleted API key\n- OAuth bearer token sent via `x-api-key` instead of `Authorization: Bearer`\n- Both `ANTHROPIC_API_KEY` and `ANTHROPIC_AUTH_TOKEN` set — the SDK sends both headers and the API rejects the request\n\n**Fix:** Set `ANTHROPIC_API_KEY`, or run `ant auth login` and leave the client constructor empty. For raw HTTP with an OAuth token, use `Authorization: Bearer <token>` (not `x-api-key:`).\n\n---\n\n### 403 Forbidden\n\n**Causes:**\n\n- API key doesn't have access to the requested model\n- Organization-level restrictions\n- Attempting to access beta features without beta access\n\n**Fix:** Check your API key permissions in the Console. You may need a different API key or to request access to specific features.\n\n---\n\n### 404 Not Found\n\n**Causes:**\n\n- Typo in model ID (e.g., `claude-sonnet-4.6` instead of `claude-sonnet-4-6`)\n- Using deprecated model ID\n- Invalid API endpoint\n\n**Fix:** Use exact model IDs from the models documentation. You can use aliases (e.g., `claude-opus-4-8`).\n\n---\n\n### 413 Request Too Large\n\n**Causes:**\n\n- Request body exceeds maximum size\n- Too many tokens in input\n- Image data too large\n\n**Fix:** Reduce input size — truncate conversation history, compress/resize images, or split large documents into chunks.\n\n---\n\n### 400 Validation Errors\n\nSome 400 errors are specifically related to parameter validation:\n\n- `max_tokens` exceeds model's limit\n- Invalid `temperature` value (must be 0.0-1.0)\n- `budget_tokens` >= `max_tokens` in extended thinking\n- Invalid tool definition schema\n\n**Model-specific 400s on Fable 5 / Opus 4.8 / 4.7:**\n\n- `temperature`, `top_p`, `top_k` are removed — sending any of them returns 400. Delete the parameter; see `shared/model-migration.md` → Per-SDK Syntax Reference.\n- `thinking: {type: \"enabled\", budget_tokens: N}` is removed — sending it returns 400. Use `thinking: {type: \"adaptive\"}` instead.\n- **Fable 5 only:** an explicit `thinking: {type: \"disabled\"}` returns 400 (it is accepted on Opus 4.8/4.7). Omit the `thinking` param entirely instead.\n- **Fable 5 only:** if the organization is set to zero data retention (ZDR) — or any retention below the required 30 days — then **all** Fable 5 requests return `400 invalid_request_error`, even with a perfectly valid payload. Check the org's retention configuration before debugging the request body.\n\n**Common mistake with extended thinking on older models (Opus 4.6 and earlier):**\n\n```\n# Wrong: budget_tokens must be < max_tokens\nthinking: budget_tokens=10000, max_tokens=1000  → Error!\n\n# Correct\nthinking: budget_tokens=10000, max_tokens=16000\n```\n\n---\n\n### 429 Rate Limited\n\n**Causes:**\n\n- Exceeded requests per minute (RPM)\n- Exceeded tokens per minute (TPM)\n- Exceeded tokens per day (TPD)\n\n**Headers to check:**\n\n- `retry-after`: Seconds to wait before retrying\n- `x-ratelimit-limit-*`: Your limits\n- `x-ratelimit-remaining-*`: Remaining quota\n\n**Fix:** The Anthropic SDKs automatically retry 429 and 5xx errors with exponential backoff (default: `max_retries=2`). For custom retry behavior, see the language-specific error handling examples.\n\n---\n\n### 500 Internal Server Error\n\n**Causes:**\n\n- Temporary Anthropic service issue\n- Bug in API processing\n\n**Fix:** Retry with exponential backoff. If persistent, check [status.anthropic.com](https://status.anthropic.com).\n\n---\n\n### 529 Overloaded\n\n**Causes:**\n\n- High API demand\n- Service capacity reached\n\n**Fix:** Retry with exponential backoff. Consider using a different model (Haiku is often less loaded), spreading requests over time, or implementing request queuing.\n\n---\n\n## Common Mistakes and Fixes\n\n| Mistake                         | Error            | Fix                                                     |\n| ------------------------------- | ---------------- | ------------------------------------------------------- |\n| `temperature`/`top_p`/`top_k` on Fable 5 / Opus 4.8 / 4.7 | 400 | Remove the parameter (see `shared/model-migration.md`)  |\n| `budget_tokens` on Fable 5 / Opus 4.8 / 4.7 | 400  | Use `thinking: {type: \"adaptive\"}`                      |\n| `thinking: {type: \"disabled\"}` on Fable 5 | 400    | Omit the `thinking` param entirely (accepted on Opus 4.8/4.7) |\n| Org set to ZDR / retention below 30 days (Fable 5) | 400 on every request | Fix the org's data-retention configuration — the payload isn't the problem |\n| `budget_tokens` >= `max_tokens` (older models) | 400 | Ensure `budget_tokens` < `max_tokens`                  |\n| Typo in model ID                | 404              | Use valid model ID like `claude-opus-4-8`               |\n| First message is `assistant`    | 400              | First message must be `user`                            |\n| Consecutive same-role messages  | 400              | Alternate `user` and `assistant`                        |\n| API key in code                 | 401 (leaked key) | Use environment variable                                |\n| Custom retry needs              | 429/5xx          | SDK retries automatically; customize with `max_retries` |\n\n## Typed Exceptions in SDKs\n\n**Always use the SDK's typed exception classes** instead of checking error messages with string matching. Each HTTP status code maps to a specific exception class per SDK.\n\n### Exception class names by language\n\n| HTTP | Python (`anthropic.*`) / TypeScript (`Anthropic.*`) | Ruby (`Anthropic::Errors::*`) | Java (`com.anthropic.errors.*`) | C# | PHP (`Anthropic\\Core\\Exceptions\\*`) |\n|---|---|---|---|---|---|\n| 400 | `BadRequestError` | `BadRequestError` | `BadRequestException` | `AnthropicBadRequestException` | `BadRequestException` |\n| 401 | `AuthenticationError` | `AuthenticationError` | `UnauthorizedException` | `AnthropicUnauthorizedException` | `AuthenticationException` |\n| 403 | `PermissionDeniedError` | `PermissionDeniedError` | `PermissionDeniedException` | `AnthropicForbiddenException` | `PermissionDeniedException` |\n| 404 | `NotFoundError` | `NotFoundError` | `NotFoundException` | `AnthropicNotFoundException` | `NotFoundException` |\n| 422 | `UnprocessableEntityError` | `UnprocessableEntityError` | `UnprocessableEntityException` | `AnthropicUnprocessableEntityException` | `UnprocessableEntityException` |\n| 429 | `RateLimitError` | `RateLimitError` | `RateLimitException` | `AnthropicRateLimitException` | `RateLimitException` |\n| ≥500 | `InternalServerError` | `InternalServerError` | `InternalServerException` | `Anthropic5xxException` | `InternalServerException` |\n| net | `APIConnectionError` | `APIConnectionError` | `AnthropicIoException` | `AnthropicIOException` | `APIConnectionException` |\n| base | `APIError` (both); `APIStatusError` (Python only) | `APIStatusError` / `APIError` | `AnthropicServiceException` | `AnthropicApiException` | `APIStatusException` / `APIException` |\n\nThe Ruby and PHP classes live in a dedicated errors namespace — write `Anthropic::Errors::RateLimitError` and `Anthropic\\Core\\Exceptions\\RateLimitException` (not bare `Anthropic::RateLimitError`). All 4xx C# exceptions also inherit from `Anthropic4xxException`.\n\n### Catch most-specific first, in a chain\n\nOrder `catch`/`except`/`rescue` clauses from the most specific subclass to the base class, with a separate clause for each category you handle differently — retryable (429, ≥500, network) vs. non-retryable (4xx). The SDK defines a distinct class per status for exactly this reason; a single broad catch-all discards that information.\n\n```python\ntry:\n    msg = client.messages.create(...)\nexcept anthropic.NotFoundError as e:          # 404 — e.g. bad model ID\n    ...\nexcept anthropic.RateLimitError as e:         # 429 — back off and retry\n    ...\nexcept anthropic.APIStatusError as e:         # any other non-2xx HTTP response\n    print(e.status_code, e.message)\nexcept anthropic.APIConnectionError as e:     # network failure before a response\n    ...\n```\n\nThe same chain shape applies in every SDK: TypeScript `instanceof Anthropic.NotFoundError` → `RateLimitError` → `APIConnectionError` → `APIError` (check `APIConnectionError` before `APIError` — in the TypeScript SDK it's a subclass of `APIError`, unlike Python where it's a sibling); Ruby `rescue Anthropic::Errors::NotFoundError` → `…::RateLimitError` → `…::APIStatusError`; Java `catch (NotFoundException) … catch (RateLimitException) … catch (AnthropicServiceException)`; C# `catch (AnthropicNotFoundException) … catch (AnthropicRateLimitException) … catch (AnthropicApiException)`; PHP `catch (NotFoundException) … catch (RateLimitException) … catch (APIStatusException)`.\n\n### Go — `errors.As` then branch on status\n\nThe Go SDK returns a single `*anthropic.Error` for all non-2xx responses. Unwrap it with `errors.As`, then branch on `StatusCode`:\n\n```go\n_, err := client.Messages.New(ctx, params)\nif err != nil {\n    var apierr *anthropic.Error\n    if errors.As(err, &apierr) {\n        switch apierr.StatusCode {\n        case 404:\n            // bad model ID / resource\n        case 429:\n            // back off and retry\n        default:\n            // other API error — apierr.StatusCode, apierr.RequestID\n        }\n    } else {\n        // transport-level error (*url.Error wrapping *net.OpError, etc.)\n    }\n}\n```\n\n### Error `.type` Field\n\nAll `APIStatusError` subclasses now expose a `.type` property (Python: `.type`, TypeScript: `.type`, Java: `.errorType()`, Go: `.Type()`, Ruby: `.type`, PHP: `.type`) that returns the API error type string (e.g., `\"invalid_request_error\"`, `\"authentication_error\"`, `\"rate_limit_error\"`, `\"overloaded_error\"`). Use this for programmatic error classification when you need finer granularity than the HTTP status code — for example, distinguishing `\"billing_error\"` from `\"permission_error\"` (both map to 403).\n\n```python\nexcept anthropic.APIStatusError as e:\n    if e.type == \"rate_limit_error\":\n        # handle rate limiting\n    elif e.type == \"overloaded_error\":\n        # handle overload\n```\n</doc>\n\n<doc path=\"shared/live-sources.md\">\n# Live Documentation Sources\n\nThis file contains WebFetch URLs for fetching current information from platform.claude.com and Agent SDK repositories. Use these when users need the latest data that may have changed since the cached content was last updated.\n\n## When to Use WebFetch\n\n- User explicitly asks for \"latest\" or \"current\" information\n- Cached data seems incorrect\n- User asks about features not covered in cached content\n- User needs specific API details or examples\n\n## Claude API Documentation URLs\n\n### Models & Pricing\n\n| Topic           | URL                                                                          | Extraction Prompt                                                               |\n| --------------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |\n| Models Overview | `https://platform.claude.com/docs/en/about-claude/models/overview.md`        | \"Extract current model IDs, context windows, and pricing for all Claude models\" |\n| Migration Guide | `https://platform.claude.com/docs/en/about-claude/models/migration-guide.md` | \"Extract breaking changes, deprecated parameters, and per-model migration steps when moving to a newer Claude model\" |\n| Introducing Claude Fable 5 | `https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5.md` | \"Extract capabilities, API changes, and availability stages for Claude Fable 5 and Claude Mythos 5\" |\n| Pricing         | `https://platform.claude.com/docs/en/pricing.md`                             | \"Extract current pricing per million tokens for input and output\"               |\n\n### Core Features\n\n| Topic             | URL                                                                          | Extraction Prompt                                                                      |\n| ----------------- | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- |\n| Extended Thinking | `https://platform.claude.com/docs/en/build-with-claude/extended-thinking.md` | \"Extract extended thinking parameters, budget_tokens requirements, and usage examples\" |\n| Adaptive Thinking | `https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking.md` | \"Extract adaptive thinking setup, effort levels, and Claude Opus 4.8 usage examples\"         |\n| Effort Parameter  | `https://platform.claude.com/docs/en/build-with-claude/effort.md`            | \"Extract effort levels, cost-quality tradeoffs, and interaction with thinking\"        |\n| Tool Use          | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview.md`  | \"Extract tool definition schema, tool_choice options, and handling tool results\"       |\n| Streaming         | `https://platform.claude.com/docs/en/build-with-claude/streaming.md`         | \"Extract streaming event types, SDK examples, and best practices\"                      |\n| Prompt Caching    | `https://platform.claude.com/docs/en/build-with-claude/prompt-caching.md`    | \"Extract cache_control usage, pricing benefits, and implementation examples\"           |\n\n### Media & Files\n\n| Topic       | URL                                                                    | Extraction Prompt                                                 |\n| ----------- | ---------------------------------------------------------------------- | ----------------------------------------------------------------- |\n| Vision      | `https://platform.claude.com/docs/en/build-with-claude/vision.md`      | \"Extract supported image formats, size limits, and code examples\" |\n| PDF Support | `https://platform.claude.com/docs/en/build-with-claude/pdf-support.md` | \"Extract PDF handling capabilities, limits, and examples\"         |\n\n### API Operations\n\n| Topic            | URL                                                                         | Extraction Prompt                                                                                       |\n| ---------------- | --------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |\n| Batch Processing | `https://platform.claude.com/docs/en/build-with-claude/batch-processing.md` | \"Extract batch API endpoints, request format, and polling for results\"                                  |\n| Files API        | `https://platform.claude.com/docs/en/build-with-claude/files.md`            | \"Extract file upload, download, and referencing in messages, including supported types and beta header\" |\n| Token Counting   | `https://platform.claude.com/docs/en/build-with-claude/token-counting.md`   | \"Extract token counting API usage and examples\"                                                         |\n| Rate Limits      | `https://platform.claude.com/docs/en/api/rate-limits.md`                    | \"Extract current rate limits by tier and model\"                                                         |\n| Errors           | `https://platform.claude.com/docs/en/api/errors.md`                         | \"Extract HTTP error codes, meanings, and retry guidance\"                                                |\n| Amazon Bedrock   | `https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock.md` | \"Extract the AnthropicBedrockMantle client per language, `anthropic.`-prefixed model IDs, auth paths, feature availability, and regions\" |\n| Claude Platform on AWS | `https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws.md` | \"Extract the AnthropicAWS client per language, SigV4 auth, credential precedence, short-term API keys, workspace_id, and region requirements\" |\n| Claude Platform on AWS — IAM actions | `https://platform.claude.com/docs/en/api/claude-platform-on-aws-iam-actions.md` | \"Extract the IAM action names, resource ARNs, and policy examples required for each API capability\" |\n\n### Tools\n\n| Topic          | URL                                                                                    | Extraction Prompt                                                                        |\n| -------------- | -------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------- |\n| Code Execution | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool.md` | \"Extract code execution tool setup, file upload, container reuse, and response handling\" |\n| Computer Use   | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use.md`        | \"Extract computer use tool setup, capabilities, and implementation examples\"             |\n| Bash Tool      | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/bash-tool.md`           | \"Extract bash tool schema, reference implementation, and security considerations\"        |\n| Text Editor    | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/text-editor-tool.md`    | \"Extract text editor tool commands, schema, and reference implementation\"                |\n| Memory Tool    | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/memory-tool.md`         | \"Extract memory tool commands, directory structure, and implementation patterns\"         |\n| Tool Search    | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool.md`    | \"Extract tool search setup, when to use, and cache interaction\"                          |\n| Programmatic Tool Calling | `https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling.md` | \"Extract PTC setup, script execution model, and tool invocation from code\"    |\n| Skills         | `https://platform.claude.com/docs/en/agents-and-tools/skills.md`                       | \"Extract skill folder structure, SKILL.md format, and loading behavior\"                  |\n\n### Advanced Features\n\n| Topic              | URL                                                                           | Extraction Prompt                                   |\n| ------------------ | ----------------------------------------------------------------------------- | --------------------------------------------------- |\n| Structured Outputs | `https://platform.claude.com/docs/en/build-with-claude/structured-outputs.md` | \"Extract output_config.format usage and schema enforcement\"                           |\n| Compaction         | `https://platform.claude.com/docs/en/build-with-claude/compaction.md`         | \"Extract compaction setup, trigger config, and streaming with compaction\"             |\n| Context Editing    | `https://platform.claude.com/docs/en/build-with-claude/context-editing.md`    | \"Extract context editing thresholds, what gets cleared, and configuration\"            |\n| Citations          | `https://platform.claude.com/docs/en/build-with-claude/citations.md`          | \"Extract citation format and implementation\"        |\n| Context Windows    | `https://platform.claude.com/docs/en/build-with-claude/context-windows.md`    | \"Extract context window sizes and token management\" |\n\n### Managed Agents\n\nUse these when a managed-agents binding, behavior, or wire-level detail isn't covered in the cached `shared/managed-agents-*.md` concept files or in `{lang}/managed-agents/README.md`.\n\n| Topic                 | URL                                                                              | Extraction Prompt                                                                               |\n| --------------------- | -------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- |\n| Overview              | `https://platform.claude.com/docs/en/managed-agents/overview.md`                 | \"Extract the high-level architecture and how agents/sessions/environments/vaults fit together\" |\n| Quickstart            | `https://platform.claude.com/docs/en/managed-agents/quickstart.md`               | \"Extract the minimal end-to-end agent → environment → session → stream code path\"              |\n| Agent Setup           | `https://platform.claude.com/docs/en/managed-agents/agent-setup.md`              | \"Extract agent create/update/list-versions/archive lifecycle and parameters\"                   |\n| Define Outcomes       | `https://platform.claude.com/docs/en/managed-agents/define-outcomes.md`          | \"Extract outcome definitions, evaluation hooks, and success criteria configuration\"             |\n| Sessions              | `https://platform.claude.com/docs/en/managed-agents/sessions.md`                 | \"Extract session lifecycle, status transitions, idle/terminated semantics, and resume rules\"    |\n| Environments          | `https://platform.claude.com/docs/en/managed-agents/environments.md`             | \"Extract environment config (cloud/networking), management endpoints, and reuse model\"          |\n| Self-Hosted Sandboxes | `https://platform.claude.com/docs/en/managed-agents/self-hosted-sandboxes.md`    | \"Extract config:{type:self_hosted}, ANTHROPIC_ENVIRONMENT_KEY, EnvironmentWorker.run/run_one, beta_agent_toolset, ant beta:worker poll/run, webhook-driven wake\" |\n| Self-Hosted Sandboxes — Security | `https://platform.claude.com/docs/en/managed-agents/self-hosted-sandboxes-security.md` | \"Extract what the customer owns (hardening, egress, key custody, trust boundaries) vs what Anthropic cannot do\" |\n| Events and Streaming  | `https://platform.claude.com/docs/en/managed-agents/events-and-streaming.md`     | \"Extract event stream types, stream-first ordering, reconnect/dedupe, and steering patterns\"    |\n| Tools                 | `https://platform.claude.com/docs/en/managed-agents/tools.md`                    | \"Extract built-in toolset, custom tool definitions, and tool result wire format\"                |\n| Files                 | `https://platform.claude.com/docs/en/managed-agents/files.md`                    | \"Extract file upload, mount paths, session resources, and listing/downloading session outputs\"  |\n| Permission Policies   | `https://platform.claude.com/docs/en/managed-agents/permission-policies.md`      | \"Extract permission policy types (allow/deny/confirm) and per-tool config\"                     |\n| Multi-Agent           | `https://platform.claude.com/docs/en/managed-agents/multi-agent.md`              | \"Extract multi-agent composition patterns, sub-agent invocation, and result handoff\"            |\n| Observability         | `https://platform.claude.com/docs/en/managed-agents/observability.md`            | \"Extract logging, tracing, and usage telemetry exposed by managed agents\"                       |\n| Webhooks              | `https://platform.claude.com/docs/en/managed-agents/webhooks.md`                 | \"Extract webhook endpoint registration, HMAC signature verification, supported event types, and delivery semantics\" |\n| GitHub                | `https://platform.claude.com/docs/en/managed-agents/github.md`                   | \"Extract github_repository resource shape, multi-repo mounting, and token rotation\"             |\n| MCP Connector         | `https://platform.claude.com/docs/en/managed-agents/mcp-connector.md`            | \"Extract MCP server declaration on agents and vault-based credential injection at session\"     |\n| Vaults                | `https://platform.claude.com/docs/en/managed-agents/vaults.md`                   | \"Extract vault create, credential add/rotate, OAuth refresh shape, and archive\"                 |\n| Skills                | `https://platform.claude.com/docs/en/managed-agents/skills.md`                   | \"Extract skill packaging and loading model for managed agents\"                                  |\n| Memory                | `https://platform.claude.com/docs/en/managed-agents/memory.md`                   | \"Extract memory resource shape, scoping, and lifecycle\"                                         |\n| Onboarding            | `https://platform.claude.com/docs/en/managed-agents/onboarding.md`               | \"Extract first-run setup, prerequisites, and account/region requirements\"                      |\n| Cloud Containers      | `https://platform.claude.com/docs/en/managed-agents/cloud-containers.md`         | \"Extract cloud container runtime, image config, and network/storage knobs\"                     |\n| Migration             | `https://platform.claude.com/docs/en/managed-agents/migration.md`                | \"Extract migration paths from earlier APIs/preview shapes to GA managed agents\"                 |\n\n### Anthropic CLI\n\nThe `ant` CLI provides terminal access to the Claude API. Every API resource is exposed as a subcommand. It is one convenient way to create agents, environments, sessions, and other resources from version-controlled YAML, and to inspect responses interactively.\n\n| Topic         | URL                                                     | Extraction Prompt                                                                                  |\n| ------------- | ------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |\n| Anthropic CLI | `https://platform.claude.com/docs/en/api/sdks/cli.md`   | \"Extract CLI install, authentication, command structure, and the beta:agents/environments/sessions commands\" |\n| Authentication overview | `https://platform.claude.com/docs/en/manage-claude/authentication.md` | \"Extract the credential options (API keys, interactive OAuth login, Workload Identity Federation) and when to use each\" |\n| WIF reference | `https://platform.claude.com/docs/en/manage-claude/wif-reference.md`  | \"Extract credential precedence order, the profile configuration file schema, and the configuration directory layout\" |\n\n---\n\n## Claude API SDK Repositories\n\nWebFetch these when a binding (class, method, namespace, field) isn't covered in the cached `{lang}/` skill files or in the managed-agents docs above. The SDKs include beta managed-agents support for `/v1/agents`, `/v1/sessions`, `/v1/environments`, and related resources — search the repo for `BetaManagedAgents`, `beta.agents`, `beta.sessions`, or the equivalent namespace for that language.\n\n| SDK        | URL                                                      | Extraction Prompt                                                                                                       |\n| ---------- | -------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- |\n| Python     | `https://github.com/anthropics/anthropic-sdk-python`     | \"Extract beta managed-agents namespaces, classes, and method signatures (`client.beta.agents`, `client.beta.sessions`)\" |\n| TypeScript | `https://github.com/anthropics/anthropic-sdk-typescript` | \"Extract beta managed-agents namespaces, classes, and method signatures (`client.beta.agents`, `client.beta.sessions`)\" |\n| Java       | `https://github.com/anthropics/anthropic-sdk-java`       | \"Extract beta managed-agents classes, builders, and method signatures (`client.beta().agents()`, `BetaManagedAgents*`)\" |\n| Go         | `https://github.com/anthropics/anthropic-sdk-go`         | \"Extract beta managed-agents types and method signatures (`client.Beta.Agents`, `BetaManagedAgents*` event types)\"      |\n| Ruby       | `https://github.com/anthropics/anthropic-sdk-ruby`       | \"Extract beta managed-agents methods and parameter shapes (`client.beta.agents`, `client.beta.sessions`)\"               |\n| C#         | `https://github.com/anthropics/anthropic-sdk-csharp`     | \"Extract beta managed-agents classes and method signatures (NuGet package, `BetaManagedAgents*` types)\"                 |\n| PHP        | `https://github.com/anthropics/anthropic-sdk-php`        | \"Extract beta managed-agents classes and method signatures (`$client->beta->agents`, `BetaManagedAgents*` params)\"      |\n\nEach SDK repo also ships runnable programs under `examples/` — including the refusal-fallback / `fallbacks` examples (client-side middleware registration, fallback state, server-side `fallbacks` param). Fetch those for exact per-language syntax instead of translating another language's example.\n\n---\n\n## Fallback Strategy\n\nIf WebFetch fails (network issues, URL changed):\n\n1. Use cached content from the language-specific files (note the cache date)\n2. Inform user the data may be outdated\n3. Suggest they check platform.claude.com or the GitHub repos directly\n</doc>\n\n<doc path=\"shared/managed-agents-api-reference.md\">\n# Managed Agents — Endpoint Reference\n\nAll endpoints require `x-api-key` and `anthropic-version: 2023-06-01` headers. Managed Agents endpoints additionally require the `anthropic-beta` header.\n\n## Beta Headers\n\n```\nanthropic-beta: managed-agents-2026-04-01\n```\n\nThe SDK adds this header automatically for all `client.beta.{agents,environments,sessions,vaults,memory_stores,deployments,deployment_runs}.*` calls. Skills endpoints use `skills-2025-10-02`; Files endpoints use `files-api-2025-04-14`.\n\n---\n\n## SDK Method Reference\n\nAll resources are under the `beta` namespace. Python and TypeScript share identical method names.\n\n| Resource | Python / TypeScript (`client.beta.*`) | Go (`client.Beta.*`) |\n| --- | --- | --- |\n| Agents | `agents.create` / `retrieve` / `update` / `list` / `archive` | `Agents.New` / `Get` / `Update` / `List` / `Archive` |\n| Agent Versions | `agents.versions.list` | `Agents.Versions.List` |\n| Environments | `environments.create` / `retrieve` / `update` / `list` / `delete` / `archive` | `Environments.New` / `Get` / `Update` / `List` / `Delete` / `Archive` |\n| Environment Work (self-hosted) | `environments.work.poller` / `stats` / `stop` | See `shared/managed-agents-self-hosted-sandboxes.md` |\n| Sessions | `sessions.create` / `retrieve` / `update` / `list` / `delete` / `archive` | `Sessions.New` / `Get` / `Update` / `List` / `Delete` / `Archive` |\n| Session Events | `sessions.events.list` / `send` / `stream` | `Sessions.Events.List` / `Send` / `StreamEvents` |\n| Session Threads | `sessions.threads.list` / `retrieve` / `archive`; `sessions.threads.events.list` / `stream` | `Sessions.Threads.List` / `Get` / `Archive`; `Sessions.Threads.Events.List` / `StreamEvents` |\n| Session Resources | `sessions.resources.add` / `retrieve` / `update` / `list` / `delete` | `Sessions.Resources.Add` / `Get` / `Update` / `List` / `Delete` |\n| Deployments | `deployments.create` / `pause` / `unpause` / `archive` / `run` | Not yet documented — WebFetch the SDK repo (`shared/live-sources.md`) |\n| Deployment Runs | `deployment_runs.list` / `retrieve` (TS: `deploymentRuns.*`) | Not yet documented — WebFetch the SDK repo (`shared/live-sources.md`) |\n| Vaults | `vaults.create` / `retrieve` / `update` / `list` / `delete` / `archive` | `Vaults.New` / `Get` / `Update` / `List` / `Delete` / `Archive` |\n| Credentials | `vaults.credentials.create` / `retrieve` / `update` / `list` / `delete` / `archive` / `mcp_oauth_validate` | `Vaults.Credentials.New` / `Get` / `Update` / `List` / `Delete` / `Archive` / `McpOauthValidate` |\n| Memory Stores | `memory_stores.create` / `retrieve` / `update` / `list` / `delete` / `archive` | `MemoryStores.New` / `Get` / `Update` / `List` / `Delete` / `Archive` |\n| Memories | `memory_stores.memories.create` / `retrieve` / `update` / `list` / `delete` | `MemoryStores.Memories.New` / `Get` / `Update` / `List` / `Delete` |\n| Memory Versions | `memory_stores.memory_versions.list` / `retrieve` / `redact` | `MemoryStores.MemoryVersions.List` / `Get` / `Redact` |\n\n**Naming quirks to watch for:**\n- Agents and Session Threads have **no delete** — only `archive`. Archive is **permanent**: the agent becomes read-only, new sessions cannot reference it, and there is no unarchive. Confirm with the user before archiving a production agent. Environments, Sessions, Vaults, Credentials, and Memory Stores have both `delete` and `archive`; Session Resources, Files, Skills, and Memories are `delete`-only; Memory Versions have neither — only `redact`.\n- Session resources use `add` (not `create`).\n- Go's event stream is `StreamEvents` (not `Stream`).\n- The self-hosted worker is **not** under `client.beta.*` — it's `EnvironmentWorker` from `anthropic.lib.environments` / `@anthropic-ai/sdk/helpers/beta/environments`; only `environments.work.poller/stats/stop` are client methods.\n\n**Agent shorthand:** `agent` on session create accepts three forms — a bare string (`agent=\"agent_abc123\"`, latest version), a pinned reference `{type: \"agent\", id, version}`, or `{type: \"agent_with_overrides\", id, version?, model?, system?, tools?, mcp_servers?, skills?}` to override those fields for this session only (see `shared/managed-agents-core.md` → Override agent configuration for a session).\n\n**Model shorthand:** `model` on agent create accepts either a bare string (`model=\"claude-opus-4-8\"` — uses `standard` speed) or the full config object (`{id: \"claude-opus-4-8\", speed: \"fast\"}`). Note: `speed: \"fast\"` is supported only on Opus 4.8 and Opus 4.7. Opus 4.7 fast mode is deprecated; after removal, `speed: \"fast\"` on Opus 4.7 returns an error. Opus 4.8 is the durable fast-capable tier.\n\n---\n\n## Agents\n\n**Step one of every flow.** Sessions require a pre-created agent — there is no inline agent config under `managed-agents-2026-04-01`.\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `GET` | `/v1/agents` | ListAgents | List agents |\n| `POST` | `/v1/agents` | CreateAgent | Create a saved agent configuration |\n| `GET` | `/v1/agents/{agent_id}` | GetAgent | Get agent details |\n| `POST` | `/v1/agents/{agent_id}` | UpdateAgent | Update agent configuration |\n| `POST` | `/v1/agents/{agent_id}/archive` | ArchiveAgent | Archive an agent. Makes it **read-only**; existing sessions continue, new sessions cannot reference it. No unarchive — this is the terminal state. |\n| `GET` | `/v1/agents/{agent_id}/versions` | ListAgentVersions | List agent versions |\n\n## Sessions\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `GET` | `/v1/sessions` | ListSessions | List sessions (paginated) |\n| `POST` | `/v1/sessions` | CreateSession | Create a new session |\n| `GET` | `/v1/sessions/{session_id}` | GetSession | Get session details |\n| `POST` | `/v1/sessions/{session_id}` | UpdateSession | Update session `metadata`/`title`, or `agent.tools`/`agent.mcp_servers`/`vault_ids` (session-local override; session must be `idle`). See `shared/managed-agents-core.md` → Updating the agent configuration mid-session. |\n| `DELETE` | `/v1/sessions/{session_id}` | DeleteSession | Delete a session |\n| `POST` | `/v1/sessions/{session_id}/archive` | ArchiveSession | Archive a session |\n\n## Events\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `GET` | `/v1/sessions/{session_id}/events` | ListEvents | List events (polling, paginated) |\n| `POST` | `/v1/sessions/{session_id}/events` | SendEvents | Send events (user message, tool result) |\n| `GET` | `/v1/sessions/{session_id}/events/stream` | StreamEvents | Stream events via SSE. Optional `event_deltas[]=agent.message` / `agent.thinking` opts in to live-preview `event_start`/`event_delta` events — see `shared/managed-agents-events.md` § Live previews. |\n\n## Session Threads\n\nPer-subagent event streams in multiagent sessions. See `shared/managed-agents-multiagent.md`.\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `GET` | `/v1/sessions/{session_id}/threads` | ListThreads | List threads (paginated) |\n| `GET` | `/v1/sessions/{session_id}/threads/{thread_id}` | GetThread | Retrieve one thread (carries `agent` snapshot, `status`, `parent_thread_id`, `stats`, `usage`) |\n| `POST` | `/v1/sessions/{session_id}/threads/{thread_id}/archive` | ArchiveThread | Archive a thread |\n| `GET` | `/v1/sessions/{session_id}/threads/{thread_id}/events` | ListThreadEvents | List past events for one thread (paginated) |\n| `GET` | `/v1/sessions/{session_id}/threads/{thread_id}/stream` | StreamThreadEvents | Stream one thread via SSE (SDK: `threads.events.stream`) |\n\n## Session Resources\n\n| Method   | Path                                                    | Operation        | Description                              |\n| -------- | ------------------------------------------------------- | ---------------- | ---------------------------------------- |\n| `GET` | `/v1/sessions/{session_id}/resources` | ListResources | List resources attached to session |\n| `POST` | `/v1/sessions/{session_id}/resources` | AddResource | Attach `file` or `github_repository` resource (SDK method: `add`, not `create`). `memory_store` resources attach at session-create time only. |\n| `GET` | `/v1/sessions/{session_id}/resources/{resource_id}` | GetResource | Get a single resource |\n| `POST` | `/v1/sessions/{session_id}/resources/{resource_id}` | UpdateResource | Update resource |\n| `DELETE` | `/v1/sessions/{session_id}/resources/{resource_id}` | DeleteResource | Remove resource from session |\n\n## Environments\n\n| Method   | Path                                                             | Operation            | Description                         |\n| -------- | ---------------------------------------------------------------- | -------------------- | ----------------------------------- |\n| `POST`   | `/v1/environments`                                     | CreateEnvironment    | Create environment                  |\n| `GET`    | `/v1/environments`                                     | ListEnvironments     | List environments                   |\n| `GET`    | `/v1/environments/{environment_id}`                    | GetEnvironment       | Get environment details             |\n| `POST`   | `/v1/environments/{environment_id}`                    | UpdateEnvironment    | Update environment                  |\n| `DELETE` | `/v1/environments/{environment_id}`                    | DeleteEnvironment    | Delete environment. Returns 204. |\n| `POST`   | `/v1/environments/{environment_id}/archive`            | ArchiveEnvironment   | Archive environment. Makes it **read-only**; existing sessions continue, new sessions cannot reference it. No unarchive — this is the terminal state. |\n| `GET`    | `/v1/environments/{environment_id}/work/stats`         | WorkQueueStats       | Self-hosted work-queue depth/pending/workers. `x-api-key` auth. See `shared/managed-agents-self-hosted-sandboxes.md`. |\n| `POST`   | `/v1/environments/{environment_id}/work/{work_id}/stop` | StopWork            | Self-hosted: stop a claimed work item. `x-api-key` auth. |\n\nFor `type: \"self_hosted\"`, `config` is the bare `{\"type\": \"self_hosted\"}` — `networking` and `packages` do not apply.\n\n## Deployments\n\nScheduled deployments (`depl_` IDs) run an agent on a recurring cron schedule — each firing creates a session. See `shared/managed-agents-scheduled-deployments.md` for the conceptual guide (cron/DST semantics, failure behavior, lifecycle).\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `POST`   | `/v1/deployments`                                | CreateDeployment | Create a scheduled deployment            |\n| `POST`   | `/v1/deployments/{deployment_id}/pause`          | PauseDeployment  | Suppress scheduled triggers (reversible; manual runs still allowed) |\n| `POST`   | `/v1/deployments/{deployment_id}/unpause`        | UnpauseDeployment | Resume from the next occurrence (no backfill) |\n| `POST`   | `/v1/deployments/{deployment_id}/archive`        | ArchiveDeployment | **Terminal** — schedule stops, deployment becomes immutable |\n| `POST`   | `/v1/deployments/{deployment_id}/run`            | RunDeployment    | Trigger a manual run immediately (`trigger_context.type: \"manual\"`); works while paused |\n\n## Deployment Runs\n\nEach trigger attempt (scheduled or manual) writes a `deployment_run` record (`drun_` IDs) carrying either the created `session_id` or an `error.type` (`environment_archived`, `agent_archived`, `vault_not_found`, `session_rate_limited`, `service_unavailable`).\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `GET`    | `/v1/deployment_runs?deployment_id=...`          | ListDeploymentRuns | List runs for a deployment (paginated; filter failures with `has_error=true`) |\n| `GET`    | `/v1/deployment_runs/{deployment_run_id}`        | GetDeploymentRun   | Retrieve a single run by ID (a `deployment_run.*` webhook event carries this as `data.id`) |\n\n## Vaults\n\nVaults store credentials that Anthropic manages on your behalf — MCP credentials (OAuth with auto-refresh, or static bearer tokens) and `environment_variable` credentials substituted into outbound requests at egress. Attach to sessions via `vault_ids`. See `managed-agents-tools.md` §Vaults for the conceptual guide and credential shapes.\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `POST`   | `/v1/vaults`                                     | CreateVault      | Create a vault                           |\n| `GET`    | `/v1/vaults`                                     | ListVaults       | List vaults                              |\n| `GET`    | `/v1/vaults/{vault_id}`                          | GetVault         | Get vault details                        |\n| `POST`   | `/v1/vaults/{vault_id}`                          | UpdateVault      | Update vault                             |\n| `DELETE` | `/v1/vaults/{vault_id}`                          | DeleteVault      | Delete vault                             |\n| `POST`   | `/v1/vaults/{vault_id}/archive`                  | ArchiveVault     | Archive vault                            |\n\n## Credentials\n\nCredentials are individual secrets stored inside a vault.\n\n| Method   | Path                                                              | Operation          | Description                  |\n| -------- | ----------------------------------------------------------------- | ------------------ | ---------------------------- |\n| `POST`   | `/v1/vaults/{vault_id}/credentials`                               | CreateCredential   | Create a credential          |\n| `GET`    | `/v1/vaults/{vault_id}/credentials`                               | ListCredentials    | List credentials in vault    |\n| `GET`    | `/v1/vaults/{vault_id}/credentials/{credential_id}`               | GetCredential      | Get credential metadata      |\n| `POST`   | `/v1/vaults/{vault_id}/credentials/{credential_id}`               | UpdateCredential   | Update credential            |\n| `DELETE` | `/v1/vaults/{vault_id}/credentials/{credential_id}`               | DeleteCredential   | Delete credential            |\n| `POST`   | `/v1/vaults/{vault_id}/credentials/{credential_id}/archive`       | ArchiveCredential  | Archive credential           |\n| `POST`   | `/v1/vaults/{vault_id}/credentials/{credential_id}/mcp_oauth_validate` | McpOauthValidate | Validate an MCP OAuth credential |\n\n## Memory Stores\n\nWorkspace-scoped persistent memory that survives across sessions. Attach to a session via a `{\"type\": \"memory_store\", \"memory_store_id\": ...}` entry in `resources[]` (session-create time only). See `shared/managed-agents-memory.md` for the conceptual guide, the FUSE-mount agent interface, preconditions, and versioning.\n\n| Method   | Path                                             | Operation          | Description                              |\n| -------- | ------------------------------------------------ | ------------------ | ---------------------------------------- |\n| `POST`   | `/v1/memory_stores`                              | CreateMemoryStore  | Create a store (`name`, `description`, `metadata`) |\n| `GET`    | `/v1/memory_stores`                              | ListMemoryStores   | List stores (`include_archived`, `created_at_{gte,lte}`) |\n| `GET`    | `/v1/memory_stores/{memory_store_id}`            | GetMemoryStore     | Get store details                        |\n| `POST`   | `/v1/memory_stores/{memory_store_id}`            | UpdateMemoryStore  | Update store                             |\n| `DELETE` | `/v1/memory_stores/{memory_store_id}`            | DeleteMemoryStore  | Delete store                             |\n| `POST`   | `/v1/memory_stores/{memory_store_id}/archive`    | ArchiveMemoryStore | Archive store. Makes it **read-only**; existing sessions continue, new sessions cannot reference it. No unarchive. |\n\n## Memories\n\nIndividual text documents inside a store (≤ 100KB each). `create` creates at a `path` and returns `409` (`memory_path_conflict_error`, with `conflicting_memory_id`) if the path is occupied; `update` mutates by `mem_...` ID (rename and/or content). Only `update` accepts a `precondition` (`{\"type\": \"content_sha256\", \"content_sha256\": ...}`) — on mismatch returns `409` (`memory_precondition_failed_error`). List endpoints accept `view: \"basic\"|\"full\"` (controls whether `content` is populated; `retrieve` defaults to `full`).\n\n| Method   | Path                                                              | Operation      | Description                              |\n| -------- | ----------------------------------------------------------------- | -------------- | ---------------------------------------- |\n| `GET`    | `/v1/memory_stores/{memory_store_id}/memories`                    | ListMemories   | Returns `Memory \\| MemoryPrefix`; filter by `path_prefix`, `depth`, `order_by`/`order` |\n| `POST`   | `/v1/memory_stores/{memory_store_id}/memories`                    | CreateMemory   | Create at `path` (SDK: `memories.create`); `409 memory_path_conflict_error` if occupied |\n| `GET`    | `/v1/memory_stores/{memory_store_id}/memories/{memory_id}`        | GetMemory      | Read one memory (defaults to `view=\"full\"`) |\n| `PATCH`  | `/v1/memory_stores/{memory_store_id}/memories/{memory_id}`        | UpdateMemory   | Change `content`, `path`, or both by ID; optional `precondition` |\n| `DELETE` | `/v1/memory_stores/{memory_store_id}/memories/{memory_id}`        | DeleteMemory   | Delete (optional `expected_content_sha256`) |\n\n## Memory Versions\n\nImmutable per-mutation snapshots (`memver_...`) — the audit and rollback surface. `operation` ∈ `created` / `modified` / `deleted`.\n\n| Method   | Path                                                                          | Operation             | Description                              |\n| -------- | ----------------------------------------------------------------------------- | --------------------- | ---------------------------------------- |\n| `GET`    | `/v1/memory_stores/{memory_store_id}/memory_versions`                         | ListMemoryVersions    | Newest-first; filter by `memory_id`, `operation`, `session_id`, `api_key_id`, `created_at_{gte,lte}` |\n| `GET`    | `/v1/memory_stores/{memory_store_id}/memory_versions/{version_id}`            | GetMemoryVersion      | List fields + full `content`             |\n| `POST`   | `/v1/memory_stores/{memory_store_id}/memory_versions/{version_id}/redact`     | RedactMemoryVersion   | Clear `content`/`content_sha256`/`content_size_bytes`/`path`; preserve actor + timestamps |\n\n## Files\n\n| Method   | Path                                             | Operation        | Description                              |\n| -------- | ------------------------------------------------ | ---------------- | ---------------------------------------- |\n| `POST`   | `/v1/files`                            | UploadFile       | Upload a file                            |\n| `GET`    | `/v1/files`                            | ListFiles        | List files                               |\n| `GET`    | `/v1/files/{file_id}`                  | GetFile          | Get file metadata (SDK method: `retrieve_metadata`) |\n| `GET`    | `/v1/files/{file_id}/content`          | DownloadFile     | Download file content                    |\n| `DELETE` | `/v1/files/{file_id}`                  | DeleteFile       | Delete a file                            |\n\n## Skills\n\n| Method   | Path                                                            | Operation          | Description                  |\n| -------- | --------------------------------------------------------------- | ------------------ | ---------------------------- |\n| `POST`   | `/v1/skills`                                          | CreateSkill        | Create a skill               |\n| `GET`    | `/v1/skills`                                          | ListSkills         | List skills                  |\n| `GET`    | `/v1/skills/{skill_id}`                               | GetSkill           | Get skill details            |\n| `DELETE` | `/v1/skills/{skill_id}`                               | DeleteSkill        | Delete a skill               |\n| `POST`   | `/v1/skills/{skill_id}/versions`                      | CreateVersion      | Create skill version         |\n| `GET`    | `/v1/skills/{skill_id}/versions`                      | ListVersions       | List skill versions          |\n| `GET`    | `/v1/skills/{skill_id}/versions/{version}`            | GetVersion         | Get skill version            |\n| `DELETE` | `/v1/skills/{skill_id}/versions/{version}`            | DeleteVersion      | Delete skill version         |\n\n---\n\n## Request/Response Schema Quick Reference\n\n### CreateAgent Request Body\n\n**Always start here.** `model`, `system`, `tools`, `mcp_servers`, `skills` are top-level fields on this object — they do NOT go on the session.\n\n```json\n{\n  \"name\": \"string (required, 1-256 chars)\",\n  \"model\": \"claude-opus-4-8 (required — bare string, or {id, speed} object)\",\n  \"description\": \"string (optional, up to 2048 chars)\",\n  \"system\": \"string (optional, up to 100,000 chars)\",\n  \"tools\": [\n    { \"type\": \"agent_toolset_20260401\" }\n  ],\n  \"skills\": [\n    { \"type\": \"anthropic\", \"skill_id\": \"xlsx\" },\n    { \"type\": \"custom\", \"skill_id\": \"skill_abc123\", \"version\": \"1\" }\n  ],\n  \"mcp_servers\": [\n    {\n      \"type\": \"url\",\n      \"name\": \"github\",\n      \"url\": \"https://api.githubcopilot.com/mcp/\"\n    }\n  ],\n  \"multiagent\": {\n    \"type\": \"coordinator\",\n    \"agents\": [\n      \"agent_abc123\",\n      { \"type\": \"agent\", \"id\": \"agent_def456\", \"version\": 4 },\n      { \"type\": \"self\" }\n    ]\n  },\n  \"metadata\": {\n    \"key\": \"value (max 16 pairs, keys ≤64 chars, values ≤512 chars)\"\n  }\n}\n```\n\n> Limits: `tools` max 128, `skills` max 20, `mcp_servers` max 20 (unique names). `multiagent.agents` 1–20 entries (string ID | `{type:\"agent\",id,version?}` | `{type:\"self\"}`) — see `shared/managed-agents-multiagent.md`.\n\n### CreateSession Request Body\n\n```json\n{\n  \"agent\": \"agent_abc123 (required — string shorthand for latest version, or {type: \\\"agent\\\", id, version} object)\",\n  \"environment_id\": \"env_abc123 (required)\",\n  \"title\": \"string (optional)\",\n  \"resources\": [\n    {\n      \"type\": \"github_repository\",\n      \"url\": \"https://github.com/owner/repo (required)\",\n      \"authorization_token\": \"ghp_... (required)\",\n      \"mount_path\": \"/workspace/repo (optional — defaults to /workspace/<repo-name>)\",\n      \"checkout\": { \"type\": \"branch\", \"name\": \"main\" }\n    }\n  ],\n  \"vault_ids\": [\"vlt_abc123 (optional — vault credentials: MCP auth + environment variables)\"],\n  \"metadata\": {\n    \"key\": \"value\"\n  }\n}\n```\n\n> The `agent` field accepts a string ID, `{type: \"agent\", id, version}`, or `{type: \"agent_with_overrides\", id, version?, ...}` for session-local overrides of `model`/`system`/`tools`/`mcp_servers`/`skills`. Outside the overrides form, those fields live on the agent, not here.\n>\n> **`checkout`** accepts `{type: \"branch\", name: \"...\"}` or `{type: \"commit\", sha: \"...\"}`. Omit for the repo's default branch.\n\n### CreateEnvironment Request Body\n\n```json\n{\n  \"name\": \"string (required)\",\n  \"description\": \"string (optional)\",\n  \"config\": {\n    \"type\": \"cloud | self_hosted\",\n    \"networking\": {\n      \"type\": \"unrestricted | limited (union — see SDK types)\"\n    },\n    \"packages\": { }\n  },\n  \"metadata\": { \"key\": \"value\" }\n}\n```\n\n### CreateDeployment Request Body\n\n```json\n{\n  \"name\": \"Weekly compliance scan\",\n  \"agent\": \"agent_abc123 (required — same shapes as CreateSession)\",\n  \"environment_id\": \"env_abc123 (required)\",\n  \"initial_events\": [\n    { \"type\": \"user.message\", \"content\": [{ \"type\": \"text\", \"text\": \"Run the weekly compliance scan.\" }] }\n  ],\n  \"schedule\": {\n    \"type\": \"cron\",\n    \"expression\": \"0 20 * * 5\",\n    \"timezone\": \"America/New_York\"\n  }\n}\n```\n\n> Optional session config (`resources`, `vault_ids`, etc.) is supported the same way as on CreateSession. Response includes `status`, `paused_reason`, and `schedule.upcoming_runs_at` (next fire times). See `shared/managed-agents-scheduled-deployments.md`.\n\n### SendEvents Request Body\n\n```json\n{\n  \"events\": [\n    {\n      \"type\": \"user.message\",\n      \"content\": [\n        {\n          \"type\": \"text\",\n          \"text\": \"Hello\"\n        }\n      ]\n    }\n  ]\n}\n```\n\n> `system.message` events (update the system prompt between turns) use the same envelope with `type: \"system.message\"` — Claude Opus 4.8 only; see `shared/managed-agents-events.md` § Updating the system prompt mid-session.\n\n### Define Outcome Event\n\n```json\n{\n  \"type\": \"user.define_outcome\",\n  \"description\": \"Build a DCF model for Costco in .xlsx\",\n  \"rubric\": { \"type\": \"file\", \"file_id\": \"file_01...\" },\n  \"max_iterations\": 5\n}\n```\n\n> `rubric` is required: `{type: \"text\", content}` or `{type: \"file\", file_id}`. `max_iterations` default 3, max 20. Echoed back with `outcome_id` + `processed_at`. See `shared/managed-agents-outcomes.md`.\n\n### Tool Result Event\n\n```json\n{\n  \"type\": \"user.custom_tool_result\",\n  \"custom_tool_use_id\": \"sevt_abc123\",\n  \"content\": [{ \"type\": \"text\", \"text\": \"Result data\" }],\n  \"is_error\": false\n}\n```\n\n---\n\n## Error Handling\n\nManaged Agents endpoints use the standard Anthropic API error format. Errors are returned with an HTTP status code and a JSON body containing `type`, `error`, and `request_id`:\n\n```json\n{\n  \"type\": \"error\",\n  \"error\": {\n    \"type\": \"invalid_request_error\",\n    \"message\": \"Description of what went wrong\"\n  },\n  \"request_id\": \"req_011CRv1W3XQ8XpFikNYG7RnE\"\n}\n```\n\nInclude the `request_id` when reporting issues to Anthropic — it lets us trace the request end-to-end. The inner `error.type` is one of the following:\n\n| Status | Error type | Description |\n|---|---|---|\n| 400 | `invalid_request_error` | The request was malformed or missing required parameters |\n| 401 | `authentication_error` | Invalid or missing API key |\n| 403 | `permission_error` | The API key doesn't have permission for this operation |\n| 404 | `not_found_error` | The requested resource doesn't exist |\n| 409 | `invalid_request_error` | The request conflicts with the resource's current state (e.g., sending to an archived session) |\n| 413 | `request_too_large` | The request body exceeds the maximum allowed size |\n| 429 | `rate_limit_error` | Too many requests — check rate limit headers for retry timing |\n| 500 | `api_error` | An internal server error occurred |\n| 529 | `overloaded_error` | The service is temporarily overloaded — retry with backoff |\n\nNote that `409 Conflict` carries `error.type: \"invalid_request_error\"` (there is no separate `conflict_error` type); inspect both the HTTP status and the `message` to distinguish conflicts from other invalid requests.\n\n---\n\n## Pagination\n\nMost Managed Agents list endpoints use the `page` / `next_page` cursor scheme:\n\n| Field | Where | Notes |\n|---|---|---|\n| `limit` | query | Max items per page |\n| `page` | query | Opaque cursor from a previous response — pass a `next_page` or `prev_page` value here |\n| `order` | query | `asc` / `desc` on endpoints that support sorting. A cursor encodes the `order` of the request that produced it — reusing it with a different `order` returns 400. Other params (filters, `limit`) can change between paginated requests. |\n| `next_page` | response | Cursor for the next page; `null` when there are no more results |\n| `prev_page` | response | Cursor for the previous page on endpoints that support backward pagination — currently **only `GET /v1/sessions`**. `null` on the first page. On endpoints that don't support it, the field is **absent** (not `null`). |\n\nEvery SDK exposes an auto-paginating iterator that follows `next_page`. In Python and TypeScript, iterate the list result directly; the other SDKs expose the iterator via a separate method (iterating the plain list result returns one page). SDK auto-pagination is **forward-only** — to go back a page, read `prev_page` from the response and pass it back as the `page` parameter yourself.\n\n> ⚠️ Some endpoints use a **different** cursor scheme: Message Batches, Files, Models, and several Admin API endpoints take `after_id`/`before_id` and return `has_more`/`first_id`/`last_id` instead of `page`/`next_page`. Some `page`-scheme endpoints (e.g. `GET /v1/skills`) also return a `has_more` boolean alongside `next_page`. Check the endpoint's reference page for its exact pagination fields.\n\n---\n\n## Rate Limits\n\nManaged Agents endpoints have per-organization request-per-minute (RPM) limits, separate from your [Messages API token limits](https://platform.claude.com/docs/en/api/rate-limits). Model inference inside a session still draws from your organization's standard ITPM/OTPM limits.\n\n| Endpoint group | Scope | RPM | Max concurrent |\n|---|---|---|---|\n| Create operations (Agents, Sessions, Vaults) | organization | 300 | — |\n| All other operations (Agents, Sessions, Vaults) | organization | 600 | — |\n| All operations (Environments) | organization | 60 | 5 |\n\nFiles and Skills endpoints use the standard tier-based [rate limits](https://platform.claude.com/docs/en/api/rate-limits).\n\nWhen a limit is exceeded the API returns `429` with a `rate_limit_error` (see [Error Handling](#error-handling) for the response envelope) and a `retry-after` header indicating how many seconds to wait before retrying. The Anthropic SDK reads this header and retries automatically.\n</doc>\n\n<doc path=\"shared/managed-agents-client-patterns.md\">\n# Managed Agents — Common Client Patterns\n\nPatterns you'll write on the client side when driving a Managed Agent session, grounded in working SDK examples.\n\nCode samples are TypeScript — other languages follow the same shape; see `{lang}/managed-agents/README.md` (cURL and C#: `curl/managed-agents.md`) for equivalents.\n\n---\n\n## 1. Lossless stream reconnect\n\n**Problem:** SSE has no replay. If the connection drops mid-session, a naive reconnect re-opens the stream from \"now\" and you silently miss every event emitted in between.\n\n**Solution:** on reconnect, fetch the full event history via `events.list()` *before* consuming the live stream, and dedupe on event ID as the live stream catches up.\n\n```ts\nconst seenEventIds = new Set<string>()\nconst stream = await client.beta.sessions.events.stream(session.id)\n\n// Stream is now open and buffering server-side. Read history first.\nfor await (const event of client.beta.sessions.events.list(session.id)) {\n  seenEventIds.add(event.id)\n  handle(event)\n}\n\n// Tail the live stream. Dedupe only gates handle() — terminal checks must run\n// even for already-seen events, or a terminal event that was in the history\n// response gets skipped by `continue` and the loop never exits.\nfor await (const event of stream) {\n  if (!seenEventIds.has(event.id)) {\n    seenEventIds.add(event.id)\n    handle(event)\n  }\n  if (event.type === 'session.status_terminated') break\n  if (event.type === 'session.status_idle' && event.stop_reason.type !== 'requires_action') break\n}\n```\n\n---\n\n## 2. `processed_at` — queued vs processed\n\nEvery event on the stream carries `processed_at` (ISO 8601). For client-sent events (`user.message`, `user.interrupt`, `user.tool_confirmation`, `user.custom_tool_result`) it's `null` when the event has been queued but not yet picked up by the agent, and populated once the agent processes it. The same event appears on the stream twice — once with `processed_at: null`, once with a timestamp.\n\n```ts\nfor await (const event of stream) {\n  if (event.type === 'user.message') {\n    if (event.processed_at == null) onQueued(event.id)\n    else onProcessed(event.id, event.processed_at)\n  }\n}\n```\n\nUse this to drive pending → acknowledged UI state for anything you send. How you map a locally-rendered optimistic message to the server-assigned `event.id` is application-specific (typically via the return value of `events.send()` or FIFO ordering).\n\n---\n\n## 3. Interrupt a running session\n\nSend `user.interrupt` as a normal event. The session keeps running until it reaches a safe boundary, then goes idle.\n\n```ts\nawait client.beta.sessions.events.send(session.id, {\n  events: [{ type: 'user.interrupt' }],\n})\n\n// Drain until the session is truly done — see Pattern 5 for the full gate.\nfor await (const event of stream) {\n  if (event.type === 'session.status_terminated') break\n  if (\n    event.type === 'session.status_idle' &&\n    event.stop_reason.type !== 'requires_action'\n  ) break\n}\n```\n\nReference: `interrupt.ts` — sends the interrupt the moment it sees `span.model_request_start`, drains to idle, then verifies via `sessions.retrieve()`.\n\n---\n\n## 4. `tool_confirmation` round-trip\n\nWhen the agent has `permission_policy: { type: 'always_ask' }`, any call to that tool fires an `agent.tool_use` event with `evaluated_permission === 'ask'` and the session goes idle waiting for a decision. Respond with `user.tool_confirmation`.\n\n```ts\nfor await (const event of stream) {\n  if (event.type === 'agent.tool_use' && event.evaluated_permission === 'ask') {\n    await client.beta.sessions.events.send(session.id, {\n      events: [{\n        type: 'user.tool_confirmation',\n        tool_use_id: event.id,         // not a toolu_ id — use event.id\n        result: 'allow',               // or 'deny'\n        // deny_message: '...',        // optional, only with result: 'deny'\n      }],\n    })\n  }\n}\n```\n\nKey points:\n- `tool_use_id` is `event.id` (typically `sevt_...`), **not** a `toolu_...` ID.\n- `result` is `'allow' | 'deny'`. Use `deny_message` to tell the model *why* you denied — it gets surfaced back to the agent.\n- Multiple pending tools: respond once per `agent.tool_use` event with `evaluated_permission === 'ask'`.\n\nReference: `tool-permissions.ts`.\n\n---\n\n## 5. Correct idle-break gate\n\nDo not break on `session.status_idle` alone. The session goes idle transiently — e.g. between parallel tool executions, while waiting for a `user.tool_confirmation`, or while awaiting a `user.custom_tool_result`. Break when idle with a terminal `stop_reason`, or on `session.status_terminated`.\n\n```ts\nfor await (const event of stream) {\n  handle(event)\n  if (event.type === 'session.status_terminated') break\n  if (event.type === 'session.status_idle') {\n    if (event.stop_reason.type === 'requires_action') continue // waiting on you — handle it\n    break // end_turn or retries_exhausted — both terminal\n  }\n}\n```\n\n`stop_reason.type` values on `session.status_idle`:\n- `requires_action` — agent is waiting on a client-side event (tool confirmation, custom tool result). Handle it, don't break.\n- `retries_exhausted` — terminal failure. Break, then check `sessions.retrieve()` for the error state.\n- `end_turn` — normal completion.\n\n---\n\n## 6. Post-idle status-write race\n\nThe SSE stream emits `session.status_idle` slightly before the session's queryable status reflects it. Clients that break on idle and immediately call `sessions.delete()` or `sessions.archive()` will intermittently 400 with \"cannot delete/archive while running.\"\n\nPoll before cleanup:\n\n```ts\nlet s\nfor (let i = 0; i < 10; i++) {\n  s = await client.beta.sessions.retrieve(session.id)\n  if (s.status !== 'running') break\n  await new Promise(r => setTimeout(r, 200))\n}\nif (s?.status !== 'running') {\n  await client.beta.sessions.archive(session.id)\n} // else: still running after 2s — don't archive, let it settle or escalate\n```\n\n---\n\n## 7. Stream-first, then send\n\nAlways open the stream **before** sending the kickoff event. Otherwise the agent may process the event and emit the first events before your consumer is attached, and you'll miss them.\n\n```ts\nconst stream = await client.beta.sessions.events.stream(session.id)\nawait client.beta.sessions.events.send(session.id, {\n  events: [{ type: 'user.message', content: [{ type: 'text', text: 'Hello' }] }],\n})\nfor await (const event of stream) { /* ... */ }\n```\n\nThe `Promise.all([stream, send])` shape works too, but stream-first is simpler and has the same effect — the stream starts buffering the moment it's opened.\n\n---\n\n## 8. File-mount gotchas\n\n**The mounted resource has a different `file_id` than the file you uploaded.** Session creation makes a session-scoped copy.\n\n```ts\nconst uploaded = await client.beta.files.upload({ file, purpose: 'agent_resource' })\n// uploaded.id         → the original file\nconst session = await client.beta.sessions.create({\n  /* ... */\n  resources: [{ type: 'file', file_id: uploaded.id, mount_path: '/workspace/data.csv' }],\n})\n// session.resources[0].file_id !== uploaded.id  ← different IDs\n```\n\nDelete the original via `files.delete(uploaded.id)`; the session-scoped copy is garbage-collected with the session. `mount_path` must be absolute — see `shared/managed-agents-environments.md`.\n\n---\n\n## 9. Secrets for non-MCP APIs and CLIs — keep them host-side via custom tools\n\n**Problem:** you want the agent to call a third-party API or run a CLI that needs a secret (API key, token, service-account credential), but you can't or don't want to hand the secret to a vault.\n\n**First check:** for cloud environments, the first-class answer is now a vault `environment_variable` credential — the agent's shell sees an opaque placeholder and the real secret is substituted at egress. See `shared/managed-agents-tools.md` → Vaults. Use this pattern instead when that doesn't fit: **self-hosted sandboxes** (env-var credentials not yet supported there), clients that reject the placeholder via local format validation, secrets that must never leave your infrastructure, or calls that need host-side binaries.\n\n**Solution:** move the authenticated call to your side. Declare a custom tool on the agent; when the agent emits `agent.custom_tool_use`, your orchestrator (the process reading the SSE stream) executes the call with its own credentials and responds with `user.custom_tool_result`. The container never sees the key.\n\n```ts\n// Agent template: declare the tool, no credentials\ntools: [{ type: 'custom', name: 'linear_graphql', input_schema: { /* query, vars */ } }]\n\n// Orchestrator: handle the call with host-side creds\nfor await (const event of stream) {\n  if (event.type === 'agent.custom_tool_use' && event.name === 'linear_graphql') {\n    const result = await linear.request(event.input.query, event.input.vars) // host's key\n    await client.beta.sessions.events.send(session.id, {\n      events: [{ type: 'user.custom_tool_result', tool_use_id: event.id, result }],\n    })\n  }\n}\n```\n\nSame shape works for `gh` CLI, local eval scripts, or anything else that needs host-side auth or binaries.\n\n**Security note:** this does not expose a public endpoint. `agent.custom_tool_use` arrives on the SSE stream your orchestrator already holds open with your Anthropic API key, and `user.custom_tool_result` goes back via `events.send()` under the same key. Your orchestrator is a client, not a server — nothing unauthenticated is listening.\n\n**Do not embed API keys in the system prompt or user messages as a workaround.** Prompts and messages are stored in the session's event history, returned by `events.list()`, and included in compaction summaries — a secret placed there is durably persisted and readable via the API for the life of the session.\n</doc>\n\n<doc path=\"shared/managed-agents-core.md\">\n# Managed Agents — Core Concepts\n\n## Architecture\n\nManaged Agents is built around four core concepts:\n\n| Concept | Endpoint | What it is |\n|---|---|---|\n| **Agent** | `/v1/agents` | A persisted, versioned object defining the agent's capabilities and persona: model, system prompt, tools, MCP servers, skills. **Must be created before starting a session.** See the Agents section below. |\n| **Session** | `/v1/sessions` | A stateful interaction with an agent. References a pre-created agent by ID + an environment + initial instructions. Produces an event stream. |\n| **Environment** | `/v1/environments` | A template defining the configuration for container provisioning. |\n| **Container** | N/A | An isolated compute instance where the agent's **tools** execute (bash, file ops, code). The agent loop does not run here — it runs on Anthropic's orchestration layer and acts on the container via tool calls. |\n\n```\n                       ┌─────────────────────────────────────┐\n                       │  Anthropic orchestration layer      │\nAgent (config) ───────▶│  (agent loop: Claude + tool calls)  │\n                       └──────────────┬──────────────────────┘\n                                      │ tool calls\n                                      ▼\nEnvironment (template) ──▶ Container (tool execution workspace)\n                                 │\n                         Session ─┤\n                                 ├── Resources (files, repos, memory stores — attached at startup)\n                                 ├── Vault IDs (MCP credential references)\n                                 └── Conversation (event stream in/out)\n```\n\n> **Agent creation is a prerequisite.** Sessions reference a pre-created agent by ID — `model`/`system`/`tools` live on the agent object, never on the session. Every flow starts with `POST /v1/agents`.\n\n---\n\n## Session Lifecycle\n\n```\nrescheduling → running ↔ idle → terminated\n```\n\n| Status         | Description                                                        |\n| -------------- | ------------------------------------------------------------------ |\n| `idle` | Agent has finished the current task, and is awaiting input. It's either waiting for input to continue working via a `user.message` or blocked awaiting a `user.custom_tool_result` or `user.tool_confirmation`. The `stop_reason` attached contains more information about why the Agent has stopped working. |\n| `running` | Session has starting running, and the Agent is actively doing work. |\n| `rescheduling` | Session is (re)scheduling after a retryable error has occurred, ready to be picked up by the orchestration system. |\n| `terminated` | Session has terminated, entering an irreversible and unusable state.  |\n\n- Events can be sent when the session is `running` or `idle`. Messages are queued and processed in order.\n- The agent transitions `idle → running` when it receives a new event, then back to `idle` when done.\n- Errors surface as `session.error` events in the stream, not as a status value.\n\nEvery session has a live trace view in the Anthropic Console at `https://platform.claude.com/workspaces/default/sessions/{session_id}`. Print this URL immediately after creating a session so the user can watch tool calls and messages stream in real time. The `default` workspace segment auto-resolves to the session's actual workspace on load, so you don't need the workspace id.\n\n### Built-in session features\n\n- **Context compaction** — if you approach max context, the API automatically condenses session history to keep the interaction going\n- **Prompt caching** — historical repeated tokens are cached, reducing processing time and cost\n- **Extended thinking** — on by default, returned as `agent.thinking` events\n\n### Session operations\n\n| Operation | Notes |\n|---|---|\n| List / fetch | Paginated list or single resource by ID |\n| Update | Only `title` is updatable |\n| Archive | Session becomes **read-only**. Not reversible. |\n| Delete | Permanently deletes session, event history, container, and checkpoints. |\n\nThese are ops/inspection calls — typically made from a terminal, not application code. From the shell (see `shared/anthropic-cli.md`):\n\n```sh\nant beta:sessions list --transform '{id,title,status,created_at}' --format jsonl\nant beta:sessions retrieve --session-id \"$SID\"\nant beta:sessions:events stream --session-id \"$SID\"   # watch events live\nant beta:sessions archive  --session-id \"$SID\"\nant beta:sessions delete   --session-id \"$SID\"\n```\n\n---\n\n## Sessions\n\nA session is a running agent instance inside an environment.\n\n### Session Object\n\nKey fields returned by the API:\n\n| Field           | Type     | Description                                         |\n| --------------- | -------- | --------------------------------------------------- |\n| `type` | string | Always `\"session\"` |\n| `id` | string | Unique session ID |\n| `title` | string | Human-readable title |\n| `status` | string | `idle`, `running`, `rescheduling`, `terminated` |\n| `created_at` | string | ISO 8601 timestamp |\n| `updated_at` | string | ISO 8601 timestamp |\n| `archived_at` | string | ISO 8601 timestamp (nullable) |\n| `environment_id` | string | Environment ID |\n| `agent` | object | Agent configuration |\n| `resources` | array | Attached files, repos, and memory stores |\n| `metadata` | object | User-provided key-value pairs (max 8 keys) |\n| `usage` | object | Token usage statistics |\n\n### Creating a session\n\n**A session is meaningless without an agent.** Sessions reference a pre-created agent by ID. Create the agent first via `agents.create()`, then reference it:\n\n```ts\n// 1. Create the agent (reusable, versioned)\nconst agent = await client.beta.agents.create(\n  {\n    name: \"Coding Assistant\",\n    model: \"claude-opus-4-8\",\n    system: \"You are a helpful coding agent.\",\n    tools: [{ type: \"agent_toolset_20260401\"}],\n  },\n);\n\n// 2. Start a session that references it\nconst session = await client.beta.sessions.create(\n  {\n    agent: agent.id,  // string shorthand → latest version. Or: { type: \"agent\", id: agent.id, version: agent.version }\n    environment_id: environmentId,\n    title: \"Hello World Session\",\n  },\n);\n```\n\n> 💡 **Watch it live in Console.** While developing, print a link so you can click through to the session UI instead of parsing the event stream: `https://platform.claude.com/workspaces/default/sessions/{session.id}`. The `default` workspace segment auto-resolves to the session's actual workspace on load, so you don't need to know the workspace id. Include this `print`/`console.log` in code you generate for users who are iterating locally.\n\n**Session creation parameters:**\n\n| Field           | Type     | Required | Description                                    |\n| --------------- | -------- | -------- | ---------------------------------------------- |\n| `agent`         | string or object | **Yes** | Three forms: string shorthand `\"agent_abc123\"` (latest version); pinned `{type: \"agent\", id, version}`; or `{type: \"agent_with_overrides\", id, version?, ...}` to override `model`/`system`/`tools`/`mcp_servers`/`skills` for this session only — see § Override agent configuration for a session |\n| `environment_id`| string   | **Yes**  | Environment ID                                 |\n| `title`         | string   | No       | Human-readable name (appears in logs/dashboards) |\n| `resources`     | array    | No       | Files, GitHub repos, or memory stores, attached to the container at startup. Memory stores are session-create-only (not addable via `resources.add()`). |\n| `vault_ids`     | array    | No       | Vault IDs (`vlt_*`) — MCP credentials with auto-refresh + `environment_variable` secrets substituted at egress. See `shared/managed-agents-tools.md` → Vaults. |\n| `metadata`      | object   | No       | User-provided key-value pairs                  |\n\n**Agent configuration fields** (passed to `agents.create()`, not `sessions.create()`):\n\n| Field         | Type     | Required | Description                                    |\n| ------------- | -------- | -------- | ---------------------------------------------- |\n| `name`        | string   | **Yes**  | Human-readable name (1-256 chars)              |\n| `model`       | string or object | **Yes** | Claude model ID (bare string, or `{id, speed}` object). All Claude 4.5+ models supported. |\n| `system`      | string   | No       | System prompt — defines the agent's behavior (up to 100K chars) |\n| `tools`       | array    | No       | Encompasses three kinds: (1) pre-built Claude Agent tools (`agent_toolset_20260401`), (2) MCP tools (`mcp_toolset`), and (3) custom client-side tools. Max 128. |\n| `mcp_servers` | array    | No       | MCP server connections — standardized third-party capabilities (e.g. GitHub, Asana). Max 20, unique names. See `shared/managed-agents-tools.md` → MCP Servers. |\n| `skills`      | array    | No       | Customized \"best-practices\" context with progressive disclosure. Max 20. See `shared/managed-agents-tools.md` → Skills. |\n| `description` | string   | No       | Description of the agent (up to 2048 chars)    |\n| `multiagent`  | object   | No       | `{type: \"coordinator\", agents: [...]}` — roster this agent may delegate to. See `shared/managed-agents-multiagent.md`. |\n| `metadata`    | object   | No       | Arbitrary key-value pairs (max 16, keys ≤64 chars, values ≤512 chars) |\n\n---\n\n## Agents\n\n**This is where every Managed Agents flow begins.** The agent object is a persisted, versioned configuration — you create it once, then reference it by ID every time you start a session. No agent → no session.\n\n### Agent Object\n\nThe API is **flat** — `model`, `system`, `tools` etc. are top-level fields, not wrapped in an `agent:{}` sub-object.\n\n| Field              | Type     | Required | Description                                        |\n| ------------------ | -------- | -------- | -------------------------------------------------- |\n| `name`             | string   | Yes      | Human-readable name                                |\n| `model`            | string   | Yes      | Claude model ID                                    |\n| `system`           | string   | No       | System prompt                                      |\n| `tools`            | array    | No       | Agent toolset / MCP toolset / custom tools         |\n| `mcp_servers`      | array    | No       | MCP server connections                             |\n| `skills`           | array    | No       | Skill references (max 20)                          |\n| `description`      | string   | No       | Description of the agent                           |\n| `multiagent`       | object   | No       | Coordinator roster — see `shared/managed-agents-multiagent.md` |\n| `metadata`         | object   | No       | Arbitrary key-value pairs                          |\n\n### Lifecycle: create once, run many, update in place\n\nThe agent is a **persistent resource**, not a per-run parameter. The intended pattern:\n\n```\n┌─ setup (once) ─────────┐     ┌─ runtime (every invocation) ─┐\n│ agents.create()        │     │ sessions.create(             │\n│   → store agent_id     │ ──→ │   agent={type:..., id: ID}   │\n│     in config/env/db   │     │ )                            │\n└────────────────────────┘     └──────────────────────────────┘\n```\n\n**Anti-pattern:** calling `agents.create()` at the top of every script run. This accumulates orphaned agent objects, pays create latency on every invocation, and defeats the versioning model. If you see `agents.create()` in a function that's called per-request or per-cron-tick, that's wrong — hoist it to one-time setup and persist the ID.\n\n> **Recommended — define agents and environments as YAML + apply via the `ant` CLI.** The split is **CLI for the control plane, SDK for the data plane**: agents and environments are relatively static resources you manage with `ant` (version-controlled YAML, applied from CI); sessions are dynamic and driven by your application through the SDK. See `shared/anthropic-cli.md` → *Version-controlled Managed Agents resources* for the `ant beta:agents create < agent.yaml` / `update --version N` flow. The SDK `agents.create()` call shown elsewhere in this doc is the in-code equivalent — use it when you need to provision programmatically, but prefer the YAML flow for anything a human maintains.\n\n### Versioning\n\nEach `POST /v1/agents/{id}` (update) creates a new immutable version (numeric timestamp, e.g. `1772585501101368014`). The agent's history is append-only — you can't edit a past version.\n\n**Why version:**\n- **Reproducibility** — pin a session to a known-good config: `{type: \"agent\", id, version: 3}`\n- **Safe iteration** — update the agent without breaking sessions already running on the old version\n- **Rollback** — if a new system prompt regresses, pin new sessions back to the prior version while you debug\n\n**`version` is optional.** Omit it (or use the string shorthand `agent=\"agent_abc123\"`) to get the latest version at session-creation time. Pass it explicitly (`{type: \"agent\", id, version: N}`) to pin for reproducibility.\n\n**Getting the version to pin:** `agents.create()` and `agents.update()` both return `version` in the response. Store it alongside `agent_id`. To fetch the current latest for an existing agent: `GET /v1/agents/{id}` → `.version`.\n\n**When to update vs create new:** Update (`POST /v1/agents/{id}`) when it's conceptually the same agent with tweaked behavior (better prompt, extra tool). Create a new agent when it's a different persona/purpose. Rule of thumb: if you'd give it the same `name`, update.\n\n### Agent Endpoints\n\n| Operation        | Method   | Path                                  |\n| ---------------- | -------- | ------------------------------------- |\n| Create           | `POST`   | `/v1/agents`                          |\n| List             | `GET`    | `/v1/agents`                          |\n| Get              | `GET`    | `/v1/agents/{id}`                     |\n| Update           | `POST`   | `/v1/agents/{id}`                     |\n| Archive          | `POST`   | `/v1/agents/{id}/archive`             |\n\n> ⚠️ **Archive is permanent.** Archiving makes the agent read-only: existing sessions continue to run, but **new sessions cannot reference it**, and there is no unarchive. Since agents have no `delete`, this is the terminal lifecycle state. Never archive a production agent as routine cleanup — confirm with the user first.\n\n### Using an Agent in a Session\n\nReference the agent by string ID (latest version) or by object with an explicit version:\n\n```python\n# String shorthand — uses the agent's latest version\nsession = client.beta.sessions.create(\n    agent=agent.id,\n    environment_id=environment_id,\n)\n\n# Or pin to a specific version (int)\nsession = client.beta.sessions.create(\n    agent={\"type\": \"agent\", \"id\": agent.id, \"version\": agent.version},\n    environment_id=environment_id,\n)\n```\n\n### Override agent configuration for a session\n\nThe third `agent` form, `agent_with_overrides`, replaces parts of the agent's configuration for **a single session** — try a different model or grant an extra tool without versioning the agent. Pass `id` (and optionally `version`; omitted = latest, same default as the other two forms) plus any of `model`, `system`, `tools`, `mcp_servers`, `skills`:\n\n```python\nsession = client.beta.sessions.create(\n    agent={\n        \"type\": \"agent_with_overrides\",\n        \"id\": agent.id,\n        \"model\": \"claude-opus-4-8\",   # replace the agent's model for this session\n        \"system\": None,           # clear the system prompt for this session\n    },\n    environment_id=environment_id,\n)\n```\n\nEach overridable field follows tri-state rules:\n- **Omit** → the session inherits the value from the referenced agent version.\n- **`null` (or `[]` for list fields)** → the session runs with that field cleared. Applies in full to `system`, `mcp_servers`, `skills`. Two exceptions: `model` is never clearable (`model: null` → 400 `agent_model_required`); clearing `tools` returns 400 when the session's effective `skills` is non-empty (skills require the `read` tool), otherwise `tools: null` / `tools: []` clears.\n- **A value** → replaces the agent's value **in full**. Overrides never merge — a `tools` override must list every tool the session should have.\n\nOverrides are session-local: they do **not** modify the agent resource or create a new agent version. The response's `agent` object reflects the post-override configuration, while its `id` and `version` still identify the base agent — so you can trace a session back to its base. In multiagent sessions, overrides apply to the coordinator and its `{type: \"self\"}` copies; roster agents referenced by ID always use their own as-created configuration (see `shared/managed-agents-multiagent.md`).\n\n### Updating the agent configuration mid-session\n\n`sessions.update()` can change `agent.tools`, `agent.mcp_servers` (including permission policies), and `vault_ids` on an **existing** session. This is a **session-local override** — it does not create a new agent version and does not propagate back to the agent object. The provided arrays are **full replacements**; to append one tool, `GET` the session, modify, and `POST` back. The session must be `idle` — interrupt first if running.\n\nOnly `tools` and `mcp_servers` can change after a session is created — to run with a `model`, `system`, or `skills` other than the agent's values, use `agent_with_overrides` at create time (above). The agent's configured `system` field is fixed for the session's lifetime; you can still **replace the effective system prompt between turns** by sending a `system.message` event (see `shared/managed-agents-events.md` § Updating the system prompt mid-session).\n\n```python\nclient.beta.sessions.update(\n    session.id,\n    agent={\n        \"tools\": [\n            {\"type\": \"agent_toolset_20260401\"},\n            {\"type\": \"mcp_toolset\", \"mcp_server_name\": \"linear\"},\n        ],\n        \"mcp_servers\": [{\"type\": \"url\", \"name\": \"linear\", \"url\": \"https://mcp.linear.app/sse\"}],\n    },\n    vault_ids=[\"vlt_...\"],\n)\n```\n</doc>\n\n<doc path=\"shared/managed-agents-environments.md\">\n# Managed Agents — Environments & Resources\n\n## Environments\n\nCreating a session requires an `environment_id`. Environments are **reusable configuration templates** for spinning up containers in Anthropic's infrastructure — you might create different environments for different use cases (e.g. data visualization vs web development, with different package sets). Anthropic handles scaling, container lifecycle, and work orchestration.\n\n**Environment names must be unique.** Creating an environment with an existing name returns 409.\n\n### Networking\n\n| Network Policy   | Description                                                   |\n| ---------------- | ------------------------------------------------------------- |\n| `unrestricted`   | Full egress (except legal blocklist)                          |\n| `limited`        | Deny-by-default; opt in via `allowed_hosts` / `allow_package_managers` / `allow_mcp_servers` |\n\n```json\n{\n  \"networking\": {\n    \"type\": \"limited\",\n    \"allow_package_managers\": true,\n    \"allow_mcp_servers\": true,\n    \"allowed_hosts\": [\"api.example.com\"]\n  }\n}\n```\n\nAll three `limited` fields are optional. `allow_package_managers` (default `false`) permits PyPI/npm/etc.; `allow_mcp_servers` (default `false`) permits the agent's configured MCP server endpoints without listing them in `allowed_hosts`.\n\n**MCP caveat:** Under `limited` networking, either set `allow_mcp_servers: true` or add each MCP server domain to `allowed_hosts`. Otherwise the container can't reach them and tools silently fail.\n\n### Creating an environment\n\nThe SDK adds `managed-agents-2026-04-01` automatically. TypeScript:\n\n```ts\nconst env = await client.beta.environments.create({\n  name: \"my_env\",\n  config: {\n    type: \"cloud\",\n    networking: { type: \"unrestricted\" },\n  },\n});\n```\n\n### Self-hosted sandboxes\n\nTo run tool execution in **your own infrastructure** instead of Anthropic's, set `config: {type: \"self_hosted\"}` — the agent loop stays on Anthropic's side, but `bash` / file ops / code execute in a container you control via an outbound-polling worker. The `networking` block does not apply (you control egress). Resource mounting (`file`, `github_repository`) and memory stores behave differently — see `shared/managed-agents-self-hosted-sandboxes.md` for the worker, credentials, and cloud-vs-self-hosted comparison.\n\n### Environment CRUD\n\n| Operation        | Method   | Path                                       | Notes |\n| ---------------- | -------- | ------------------------------------------ | ----- |\n| Create           | `POST`   | `/v1/environments`                         | |\n| List             | `GET`    | `/v1/environments`                         | Paginated (`limit`, `after_id`, `before_id`) |\n| Get              | `GET`    | `/v1/environments/{id}`                    | |\n| Update           | `POST`   | `/v1/environments/{id}`                    | Changes apply only to **new** containers; existing sessions keep their original config |\n| Delete           | `DELETE` | `/v1/environments/{id}`                    | Returns 204. |\n| Archive          | `POST`   | `/v1/environments/{id}/archive`            | Makes it **read-only**; existing sessions continue, new sessions cannot reference it. No unarchive — terminal state. |\n\n---\n\n## Resources\n\nAttach files, GitHub repositories, and memory stores to a session. **Session creation blocks until all resources are mounted** — the container won't go `running` until every file and repo is in place. Max **999 file resources** per session. Multiple GitHub repositories per session are supported. For `type: \"memory_store\"` resources (persistent cross-session memory — max 8 per session), see `shared/managed-agents-memory.md`.\n\n### File Uploads (input — host → agent)\n\nUpload a file first via the Files API, then reference by `file_id` + `mount_path`:\n\n```ts\n// 1. Upload\nconst file = await client.beta.files.upload({\n  file: fs.createReadStream(\"data.csv\"),\n  purpose: \"agent\",\n});\n\n// 2. Attach as a session resource\nconst session = await client.beta.sessions.create({\n  agent: agent.id,\n  environment_id: envId,\n  resources: [\n    { type: \"file\", file_id: file.id, mount_path: \"/workspace/data.csv\" }\n  ],\n});\n```\n\n**`mount_path` is required** and must be absolute. Parent directories are created automatically. Agent working directory defaults to `/workspace`. Files are mounted read-only — the agent writes modified versions to new paths.\n\n### Session outputs (output — agent → host)\n\nThe agent can write files to `/mnt/session/outputs/` during a session. These are automatically captured by the Files API and can be listed and downloaded afterwards:\n\n```ts\n// After the turn completes, list output files scoped to this session:\nfor await (const f of client.beta.files.list({\n  scope_id: session.id,\n  betas: [\"managed-agents-2026-04-01\"],\n})) {\n  console.log(f.filename, f.size_bytes);\n  const resp = await client.beta.files.download(f.id);\n  const text = await resp.text();\n}\n```\n\n**Requirements:**\n- The `write` tool (or `bash`) must be enabled for the agent to create output files.\n- Session-scoped `files.list` / `files.download` captures outputs written to `/mnt/session/outputs/`.\n- The filter parameter is **`scope_id`** (REST query param `?scope_id=<session_id>`). The SDK's files resource auto-adds only the `files-api-2025-04-14` header, so pass `betas: [\"managed-agents-2026-04-01\"]` explicitly (or both headers on raw HTTP) — without it the API may reject `scope_id` as an unknown field. Requires `@anthropic-ai/sdk` ≥ 0.88.0 / `anthropic` (Python) ≥ 0.92.0 — older versions don't type `scope_id`. The `ant` CLI does **not** expose this flag yet; use the SDK or curl.\n- Pass the session ID returned by `sessions.create()` verbatim (e.g. `sesn_011CZx...`) — the API validates the prefix.\n- There's a brief indexing lag (~1–3s) between `session.status_idle` and output files appearing in `files.list`. Retry once or twice if empty.\n\n> **Fallback when `scope_id` filtering is unavailable** (older SDK, or endpoint returns an error): send a follow-up `user.message` asking the agent to `read` each file under `/mnt/session/outputs/` and return the contents. The agent streams the file bodies back as `agent.message` text. This works for text files only and costs output tokens — use it to unblock, not as the primary path.\n\nThis gives you a bidirectional file bridge: upload reference data in, download agent artifacts out.\n\n### GitHub Repositories\n\nClones a GitHub repository into the session container during initialization, before the agent begins execution. The agent can read, edit, commit, and push via `bash` (`git`). Multiple repositories per session are supported — add one `resources` entry per repo. Repositories are cached, so future sessions that use the same repository start faster.\n\nRepositories are attached for the lifetime of the session — to change which repositories are mounted, create a new session. You **can** rotate a repository's `authorization_token` on a running session via `client.beta.sessions.resources.update(resource_id, {session_id, authorization_token})`; the resource `id` is returned at session creation and by `resources.list()`.\n\n**Fields:**\n\n| Field | Required | Notes |\n|---|---|---|\n| `type` | ✅ | `\"github_repository\"` |\n| `url` | ✅ | The GitHub repository URL |\n| `authorization_token` | ✅ | GitHub Personal Access Token with repository access. **Never echoed in API responses.** |\n| `mount_path` | ❌ | Path where the repository will be cloned. Defaults to `/workspace/<repo-name>`. |\n| `checkout` | ❌ | `{type: \"branch\", name: \"...\"}` or `{type: \"commit\", sha: \"...\"}`. Defaults to the repo's default branch. |\n\n**Token permission levels** (fine-grained PATs):\n- `Contents: Read` — clone only\n- `Contents: Read and write` — push changes and create pull requests\n\n**How auth works:** `authorization_token` is never placed inside the container. `git pull` / `git push` and GitHub REST calls against the attached repository are routed through an Anthropic-side git proxy that injects the token after the request leaves the sandbox. Code running in the container — including anything the agent writes — cannot read or exfiltrate it.\n\n> ‼️ **To generate pull requests** you also need GitHub **MCP server** access — the `github_repository` resource gives filesystem + git access only. See `shared/managed-agents-tools.md` → MCP Servers. The PR workflow is: edit files in the mounted repo → push branch via `bash` (authenticated via the git proxy using `authorization_token`) → create PR via the MCP `create_pull_request` tool (authenticated via the vault).\n\n**TypeScript:**\n\n```ts\n// 1. Create the agent — declare GitHub MCP (no auth here)\nconst agent = await client.beta.agents.create(\n  {\n    name: 'GitHub Agent',\n    model: 'claude-opus-4-8',\n    mcp_servers: [\n      { type: 'url', name: 'github', url: 'https://api.githubcopilot.com/mcp/' },\n    ],\n    tools: [\n      { type: 'agent_toolset_20260401', default_config: { enabled: true } },\n      { type: 'mcp_toolset', mcp_server_name: 'github' },\n    ],\n  },\n);\n\n// 2. Start a session — attach vault for MCP auth + mount the repo\nconst session = await client.beta.sessions.create({\n  agent: agent.id,\n  environment_id: envId,\n  vault_ids: [vaultId],  // vault contains the GitHub MCP OAuth credential\n  resources: [\n    {\n      type: 'github_repository',\n      url: 'https://github.com/owner/repo',\n      authorization_token: process.env.GITHUB_TOKEN,  // repo clone token (≠ MCP auth)\n      checkout: { type: 'branch', name: 'main' },\n    },\n  ],\n});\n```\n\n**Python:**\n\n```python\nimport os\n\nagent = client.beta.agents.create(\n    name=\"GitHub Agent\",\n    model=\"claude-opus-4-8\",\n    mcp_servers=[{\n        \"type\": \"url\",\n        \"name\": \"github\",\n        \"url\": \"https://api.githubcopilot.com/mcp/\",\n    }],\n    tools=[\n        {\"type\": \"agent_toolset_20260401\", \"default_config\": {\"enabled\": True}},\n        {\"type\": \"mcp_toolset\", \"mcp_server_name\": \"github\"},\n    ],\n)\n\nsession = client.beta.sessions.create(\n    agent=agent.id,\n    environment_id=env_id,\n    vault_ids=[vault_id],  # vault contains the GitHub MCP OAuth credential\n    resources=[{\n        \"type\": \"github_repository\",\n        \"url\": \"https://github.com/owner/repo\",\n        \"authorization_token\": os.environ[\"GITHUB_TOKEN\"],  # repo clone token (≠ MCP auth)\n        \"checkout\": {\"type\": \"branch\", \"name\": \"main\"},\n    }],\n)\n```\n\n---\n\n## Files API\n\nUpload and manage files for use as session resources, and download files the agent wrote to `/mnt/session/outputs/`.\n\n| Operation        | Method   | Path                                  | SDK |\n| ---------------- | -------- | ------------------------------------- | --- |\n| Upload           | `POST`   | `/v1/files`                           | `client.beta.files.upload({ file })` |\n| List             | `GET`    | `/v1/files?scope_id=...`              | `client.beta.files.list({ scope_id, betas: [\"managed-agents-2026-04-01\"] })` |\n| Get Metadata     | `GET`    | `/v1/files/{id}`                      | `client.beta.files.retrieveMetadata(id)` |\n| Download         | `GET`    | `/v1/files/{id}/content`              | `client.beta.files.download(id)` → `Response` |\n| Delete           | `DELETE` | `/v1/files/{id}`                      | `client.beta.files.delete(id)` |\n\nThe `scope_id` filter on List scopes the results to files written to `/mnt/session/outputs/` by that session. Without the filter, you get all files uploaded to your account.\n</doc>\n\n<doc path=\"shared/managed-agents-events.md\">\n# Managed Agents — Events & Steering\n\n## Events\n\n### Sending Events\n\nSend events to a session via `POST /v1/sessions/{id}/events`.\n\n| Event Type                | When to Send                                        |\n| ------------------------- | --------------------------------------------------- |\n| `user.message`            | Send a user message |\n| `user.interrupt`          | Interrupt the agent while it's running |\n| `user.tool_confirmation`  | Approve/deny a tool call (when `always_ask` policy) |\n| `user.custom_tool_result` | Provide result for a custom tool call |\n| `user.define_outcome`     | Start a rubric-graded iterate loop — see `shared/managed-agents-outcomes.md` |\n| `system.message`          | Update the agent's system prompt between turns — **Claude Opus 4.8 only**; see § Updating the system prompt mid-session |\n\n#### Updating the system prompt mid-session (`system.message`)\n\nUnlike the `system` field on the agent definition (fixed at session creation), a `system.message` event changes the system prompt **as the session progresses** — a different persona, revised constraints, or runtime-fetched context that should shape behavior going forward:\n\n```python\nclient.beta.sessions.events.send(\n    session.id,\n    events=[\n        {\n            \"type\": \"system.message\",\n            \"content\": [\n                {\"type\": \"text\", \"text\": \"The user's current timezone is America/New_York.\"},\n            ],\n        },\n    ],\n)\n```\n\nConstraints:\n\n- **Claude Opus 4.8 only.** If any model configured on the agent does not support mid-conversation system injection, the event is rejected with a `model_does_not_support_mid_conversation_system` validation error.\n- **Cannot be sent while the session is idle with `stop_reason: requires_action`** (blocked on `user.custom_tool_result` / `user.tool_confirmation`).\n- `content` accepts 1–1000 text items.\n\n### Receiving Events\n\nThree methods:\n\n1. **Streaming (SSE)**: `GET /v1/sessions/{id}/events/stream` — real-time Server-Sent Events. **Long-lived** — the server sends periodic heartbeats to keep the connection alive.\n2. **Polling**: `GET /v1/sessions/{id}/events` — paginated event list (query params: `limit` default 1000, `page`). **Returns immediately** — this is a plain paginated GET, not a long-poll.\n3. **Webhooks**: Anthropic POSTs session state transitions to your HTTPS endpoint — thin payloads (IDs only), HMAC-signed, Console-registered. See `shared/managed-agents-webhooks.md`.\n\nAll **persisted** events carry `id`, `type`, and `processed_at` (ISO 8601; `null` if not yet processed by the agent). The stream-only `event_start` / `event_delta` preview events (see § Live previews) carry only the `id` of the event they preview.\n\n> ⚠️ **Robust polling (raw HTTP).** If you bypass the SDK and roll your own poll loop, don't rely on `requests` or `httpx` timeouts as wall-clock caps — they're **per-chunk** read timeouts, reset every time a byte arrives. A trickling response (heartbeats, a wedged chunked-encoding body, a misbehaving proxy) can keep the call blocked indefinitely even with `timeout=(5, 60)` or `httpx.Timeout(120)`. Neither library has a \"total wall-clock\" timeout built in. For a hard deadline: track `time.monotonic()` at the loop level and break/cancel if a single request exceeds your budget (e.g. via a watchdog thread, or `asyncio.wait_for()` around async httpx). **Prefer the SDK** — `client.beta.sessions.events.stream()` and `client.beta.sessions.events.list()` handle timeout + retry sanely.\n>\n> If `GET /v1/sessions/{id}/events` (paginated) ever hangs after headers, you've likely hit `GET /v1/sessions/{id}/events` by mistake or a server-side stall — report it; don't treat it as a client-config problem.\n\n### Event Types (Received)\n\nEvent types use dot notation, grouped by namespace:\n\n| Event Type | Description |\n| --- | --- |\n| `agent.message` | Agent text output |\n| `agent.thinking` | Extended thinking blocks |\n| `agent.tool_use` | Agent used a built-in tool (`agent_toolset_20260401`) |\n| `agent.tool_result` | Result from a built-in tool |\n| `agent.mcp_tool_use` | Agent used an MCP tool |\n| `agent.mcp_tool_result` | Result from an MCP tool |\n| `agent.custom_tool_use` | Agent invoked a custom tool — session goes idle, you respond with `user.custom_tool_result` |\n| `agent.thread_context_compacted` | Conversation context was compacted |\n| `session.status_idle` | Agent has finished the current task, and is awaiting input. It's either waiting for input to continue working via a `user.message` or blocked awaiting a `user.custom_tool_result` or `user.tool_confirmation`. The `stop_reason` attached contains more information about why the Agent has stopped working. |\n| `session.status_running` | Session has starting running, and the Agent is actively doing work. |\n| `session.status_rescheduled` | Session is (re)scheduling after a retryable error has occurred, ready to be picked up by the orchestration system. |\n| `session.status_terminated` | Session has terminated, entering an irreversible and unusable state.  |\n| `session.error` | Error occurred during processing |\n| `span.model_request_start` | Model inference started |\n| `span.model_request_end` | Model inference completed |\n| `span.outcome_evaluation_start` / `_ongoing` / `_end` | Grader progress for outcome-oriented sessions — see `shared/managed-agents-outcomes.md` |\n| `session.thread_created` | Subagent thread spawned (multiagent) — see `shared/managed-agents-multiagent.md` |\n| `session.thread_status_running` / `_idle` / `_rescheduled` / `_terminated` | Subagent thread status transitions (multiagent). `_idle` carries `stop_reason`. |\n| `agent.thread_message_sent` / `_received` | Cross-thread message, carries `to_session_thread_id` / `from_session_thread_id` (multiagent) |\n\nThe stream also echoes back user-sent events (`user.message`, `user.interrupt`, `user.tool_confirmation`, `user.custom_tool_result`, `user.define_outcome`).\n\nStream-only delta preview events (`event_start`, `event_delta`) are the one exception to the `{domain}.{action}` naming convention — see § Live previews below; they never appear in `GET /v1/sessions/{id}/events`.\n\n---\n\n## Live previews\n\nBy default, assistant text reaches the stream as buffered `agent.message` events — emitted only after the model request that produced them finishes. **Live previews** let you render that text incrementally while the model is still generating. The buffered `agent.message` is always the authoritative record; a client that ignores previews still receives a complete, correct stream. The wire format is **not** Messages-API streaming: the delta type is `content_delta`, not `content_block_delta`, so Messages-API accumulator code does not carry over unchanged.\n\n**Opt in per stream connection** by adding the `event_deltas[]` query parameter to `GET /v1/sessions/{id}/events/stream`, repeated once per event type to preview. Accepted values: `agent.message`, `agent.thinking` (any other value → 400). Only the session-level stream supports it — per-thread streams (`/threads/{tid}/stream`) reject the parameter.\n\n```python\nstream = client.beta.sessions.events.stream(\n    session_id=session.id,\n    event_deltas=[\"agent.message\"],\n)\n```\n\nWhen a previewed event begins, the stream emits an `event_start` carrying the upcoming event's `type` and `id`; for `agent.message` it's followed by `event_delta` events carrying incremental text:\n\n```json\n{\"type\": \"event_start\", \"event\": {\"type\": \"agent.message\", \"id\": \"sevt_01abc...\"}}\n{\"type\": \"event_delta\", \"event_id\": \"sevt_01abc...\", \"delta\": {\"type\": \"content_delta\", \"index\": 0, \"content\": {\"type\": \"text\", \"text\": \"Here is the summary\"}}}\n```\n\n`event_start` and `event_delta` have no `id` or `processed_at` of their own — the only identifier they carry is the `id` of the event they preview. For `agent.thinking`, **only** the `event_start` is emitted (a \"thinking has started\" signal) — no deltas follow; read content from the buffered `agent.thinking` event.\n\n**Accumulate-and-reconcile pattern.** Treat the preview as a scratch buffer keyed by `(event_id, index)`. On `event_start`, create an empty entry for the announced `id`. On each `event_delta`, append `delta.content.text` to `(event_id, delta.index)` and render the running text. When the buffered `agent.message` arrives, match it by `id`, **discard the accumulated preview**, and render the message's content instead. The identifiers always line up: `event_start.event.id`, every `event_delta.event_id`, and the buffered event's `id` are the same value. On a normal turn the order is fixed: `session.status_running` → `span.model_request_start` → `event_start` → `event_delta`* → buffered `agent.message` → `span.model_request_end`. If the turn errors or is interrupted the buffered event may never arrive, but `span.model_request_end` still does — close any unreconciled preview when you see it. Python/TypeScript/Go SDKs ship an accumulator helper that implements this; in other SDKs apply the manual pattern to the generated event types.\n\n**Limitations:**\n- **Best effort** — under load the server may shed deltas for an event; you receive a contiguous prefix and then no further deltas for that event. The buffered `agent.message` still arrives complete. Never treat an accumulated preview as final.\n- **No replay on reconnect** — deltas are delivered only to the connection that opted in, while it's open. After a drop, follow the consolidation pattern in § Reconnecting after a dropped stream — the history fetch returns any buffered events emitted during the gap; missed deltas cannot be re-requested.\n- **Primary thread, text only** — tool use, tool results, MCP results, and subagent-thread activity are never previewed.\n- **Never persisted** — `event_start` / `event_delta` exist only on the live SSE stream, never in `GET /v1/sessions/{id}/events`.\n\n---\n\n## Steering Patterns\n\nPractical patterns for driving a session via the events surface.\n\n### Stream-first ordering\n\n**Open the stream before sending events.** The stream only delivers events that occur *after* it's opened — it does not replay current state or historical events. If you send a message first and open the stream second, early events (including fast status transitions) arrive buffered in a single batch and you lose the ability to react to them in real time.\n\n```ts\n// ✅ Correct — stream and send concurrently\nconst [response] = await Promise.all([\n  streamEvents(sessionId),   // opens SSE connection\n  sendMessage(sessionId, text),\n]);\n\n// ❌ Wrong — events before stream opens arrive as a single buffered batch\nawait sendMessage(sessionId, text);\nconst response = await streamEvents(sessionId);\n```\n\n**For full history,** use `GET /v1/sessions/{id}/events` (paginated list) — the stream only gives you live events from connection onward.\n\n### Reconnecting after a dropped stream\n\n**The SSE stream has no replay.** If your connection drops (httpx read timeout, network blip) and you reconnect, you only get events emitted *after* reconnection. Any events emitted during the gap are lost from the stream.\n\n**The consolidation pattern:** on every (re)connect, overlap the stream with a history fetch and dedupe by event ID:\n\n```python\ndef connect_with_consolidation(client, session_id):\n    # 1. Open the SSE stream first\n    stream = client.beta.sessions.events.stream(session_id=session_id)\n\n    # 2. Fetch history to cover any gap\n    history = client.beta.sessions.events.list(\n        session_id=session_id,\n    )\n\n    # 3. Yield history first, then stream — dedupe by event.id\n    seen = set()\n    for ev in history.data:\n        seen.add(ev.id)\n        yield ev\n    for ev in stream:\n        if ev.id not in seen:\n            seen.add(ev.id)\n            yield ev\n```\n\n### Message queuing\n\n**You don't have to wait for a response before sending the next message.** User events are queued server-side and processed in order. This is useful for chat bridges where the user sends rapid follow-ups:\n\n```ts\n// All three go into one session; agent processes them in order\nawait sendMessage(sessionId, \"Summarize the README\");\nawait sendMessage(sessionId, \"Actually also check the CONTRIBUTING guide\");\nawait sendMessage(sessionId, \"And compare the two\");\n// Stream once — agent responds to all three as a coherent turn\n```\n\nEvents can be sent up to the Session at any time. There is no need to wait on a specific session status to enqueue new events via `client.beta.sessions.events.send()`\n\n### Interrupt\n\nAn `interrupt` event **jumps the queue** (ahead of any pending user messages) and forces the session into `idle`. Use this for \"stop\" / \"nevermind\" / \"cancel\" commands:\n\n```ts\nawait client.beta.sessions.events.send(sessionId, {\n  events: [{ type: 'interrupt' }],\n});\n```\n\nThe agent stops mid-task. It does not see the interrupt as a message — it just halts. Send a follow-up `user` event to explain what to do instead. If an outcome is active, the interrupt also marks `span.outcome_evaluation_end.result: \"interrupted\"` (see `shared/managed-agents-outcomes.md`).\n\n> **Note**: Interrupt events may have empty IDs in the current implementation. When troubleshooting, use the `processed_at` timestamp along with surrounding event IDs.\n\n### Event payloads\n\nsome events carry useful metadata beyond the status change itself:\n\n`session.status_idle` — includes a `stop_reason` field which elaborates on why the session stopped and what type of further action is required by the user.\n```json\n{\n  \"id\": \"sevt_456\",\n  \"processed_at\": \"2026-04-07T04:27:43.197Z\",\n  \"stop_reason\": {\n    \"event_ids\": [\n      \"sevt_123\"\n    ],\n    \"type\": \"requires_action\"\n  },\n  \"type\": \"status_idle\"\n}\n```\n\n`span.model_request_end` contains a `model_usage` field for cost tracking and efficiency analysis:\n\n```json\n{\n  \"type\": \"span.model_request_end\",\n  \"id\": \"sevt_456\",\n  \"is_error\": false,\n  \"model_request_start_id\": \"sevt_123\",\n  \"model_usage\": {\n    \"cache_creation_input_tokens\": 0,\n    \"cache_read_input_tokens\": 6656,\n    \"input_tokens\": 3571,\n    \"output_tokens\": 727\n  },\n  \"processed_at\": \"2026-04-07T04:11:32.189Z\"\n}\n```\n\n**`agent.thread_context_compacted`** — emitted when the conversation history was summarized to fit context. Includes `pre_compaction_tokens` so you know how much was squeezed:\n\n```json\n{\n  \"id\": \"sevt_abc123\",\n  \"processed_at\": \"2026-03-24T14:05:15.787Z\",\n  \"type\": \"agent.thread_context_compacted\"\n}\n```\n\n### Archive\n\nWhen done with a session, archive it to free resources:\n\n```ts\nawait client.beta.sessions.archive(sessionId);\n```\n\n> Archiving a **session** is routine cleanup — sessions are per-run and disposable. **Do not generalize this to agents or environments**: those are persistent, reusable resources, and archiving them is permanent (no unarchive; new sessions cannot reference them). See `shared/managed-agents-overview.md` → Common Pitfalls.\n</doc>\n\n<doc path=\"shared/managed-agents-memory.md\">\n# Managed Agents — Memory Stores\n\n> **Public beta.** Memory stores ship under the `managed-agents-2026-04-01` beta header; the SDK sets it automatically on all `client.beta.memory_stores.*` calls. If `client.beta.memory_stores` is missing, upgrade to the latest SDK release.\n\nSessions are ephemeral by default — when one ends, anything the agent learned is gone. A **memory store** is a workspace-scoped collection of small text documents that persists across sessions. When a store is attached to a session (via `resources[]`), it is mounted into the container as a filesystem directory; the agent reads and writes it with the ordinary file tools, and a system-prompt note tells it the mount is there.\n\nEvery mutation to a memory produces an immutable **memory version** (`memver_...`), giving you an audit trail and point-in-time rollback/redact.\n\n## Object model\n\n| Object | ID prefix | Scope | Notes |\n| --- | --- | --- | --- |\n| Memory store | `memstore_...` | Workspace | Attach to sessions via `resources[]` |\n| Memory | `mem_...` | Store | One text file, addressed by `path` (≤ 100KB each — prefer many small files) |\n| Memory version | `memver_...` | Memory | Immutable snapshot per mutation; `operation` ∈ `created` / `modified` / `deleted` |\n\n## Create a store\n\n`description` is passed to the agent so it knows what the store contains — write it for the model, not for humans.\n\n```python\nstore = client.beta.memory_stores.create(\n    name=\"User Preferences\",\n    description=\"Per-user preferences and project context.\",\n)\nprint(store.id)  # memstore_01Hx...\n```\n\nOther SDKs: TypeScript `client.beta.memoryStores.create({...})`; Go `client.Beta.MemoryStores.New(ctx, ...)`. See `shared/managed-agents-api-reference.md` → SDK Method Reference for the full per-language table.\n\nStores support `retrieve` / `update` / `list` (with `include_archived`, `created_at_{gte,lte}` filters) / `delete` / **`archive`**. Archive makes the store read-only — existing session attachments continue, new sessions cannot reference it; no unarchive.\n\n### Seed with content (optional)\n\nPre-load reference material before any session runs. `memories.create` creates a memory at the given `path`; if a memory already exists there the call returns `409` (`memory_path_conflict_error`, with the `conflicting_memory_id`). The store ID is the first positional argument.\n\n```python\nclient.beta.memory_stores.memories.create(\n    store.id,\n    path=\"/formatting_standards.md\",\n    content=\"All reports use GAAP formatting. Dates are ISO-8601...\",\n)\n```\n\n## Attach to a session\n\nMemory stores go in the session's `resources[]` array alongside `file` and `github_repository` resources (see `shared/managed-agents-environments.md` → Resources). Memory stores attach at **session create time only** — `sessions.resources.add()` does not accept `memory_store`.\n\n```python\nsession = client.beta.sessions.create(\n    agent=agent.id,\n    environment_id=environment.id,\n    resources=[\n        {\n            \"type\": \"memory_store\",\n            \"memory_store_id\": store.id,\n            \"access\": \"read_write\",  # or \"read_only\"; default is \"read_write\"\n            \"instructions\": \"User preferences and project context. Check before starting any task.\",\n        }\n    ],\n)\n```\n\n| Field | Required | Notes |\n| --- | --- | --- |\n| `type` | ✅ | `\"memory_store\"` |\n| `memory_store_id` | ✅ | `memstore_...` |\n| `access` | — | `\"read_write\"` (default) or `\"read_only\"` — enforced at the filesystem level on the mount |\n| `instructions` | — | Session-specific guidance for this store, in addition to the store's `name`/`description`. ≤ 4,096 chars. |\n\n**Max 8 memory stores per session.** Attach multiple when different slices of memory have different owners or lifecycles — e.g. one read-only shared-reference store plus one read-write per-user store, or one store per end-user/team/project sharing a single agent config.\n\n### How the agent sees it (FUSE mount)\n\nEach attached store is mounted in the session container at `/mnt/memory/<store-name>/`. The agent interacts with it using the standard file tools (`bash`, `read`, `write`, `edit`, `glob`, `grep`) — there are no dedicated memory tools. `access: \"read_only\"` makes the mount read-only at the filesystem level; `\"read_write\"` allows the agent to create, edit, and delete files under it. A short description of each mount (name, path, `instructions`, access) is automatically injected into the system prompt so the agent knows the store exists without you having to mention it.\n\nWrites the agent makes under the mount are persisted back to the store and produce memory versions just like host-side `memories.update` calls.\n\n## Manage memories directly (host-side)\n\nUse these for review workflows, correcting bad memories, or seeding stores out-of-band.\n\n### List\n\nReturns `Memory | MemoryPrefix` entries — a `MemoryPrefix` (`type: \"memory_prefix\"`, just a `path`) is a directory-like node when listing hierarchically. Use `path_prefix` to scope (include a trailing slash: `\"/notes/\"` matches `/notes/a.md` but not `/notes_backup/old.md`) and `depth` to bound the tree walk. `order_by` / `order` sort the result. Pass `view=\"full\"` to include `content` in each item; the default `\"basic\"` returns metadata only.\n\n```python\nfor m in client.beta.memory_stores.memories.list(store.id, path_prefix=\"/\"):\n    if m.type == \"memory\":\n        print(f\"{m.path}  ({m.content_size_bytes} bytes, sha={m.content_sha256[:8]})\")\n    else:  # \"memory_prefix\"\n        print(f\"{m.path}/\")\n```\n\n### Read\n\n```python\nmem = client.beta.memory_stores.memories.retrieve(memory_id, memory_store_id=store.id)\nprint(mem.content)\n```\n\n`retrieve` defaults to `view=\"full\"` (content included); `view` matters mainly on list endpoints.\n\n### Create vs. update\n\n| Operation | Addressed by | Semantics |\n| --- | --- | --- |\n| `memories.create(store_id, path=..., content=...)` | **Path** | Create at `path`. `409` (`memory_path_conflict_error`, includes `conflicting_memory_id`) if the path is already occupied. |\n| `memories.update(mem_id, memory_store_id=..., path=..., content=...)` | **`mem_...` ID** | Mutate existing memory. Change `content`, `path` (rename), or both. Renaming onto an occupied path returns the same `409 memory_path_conflict_error`. |\n\n```python\nmem = client.beta.memory_stores.memories.create(\n    store.id,\n    path=\"/preferences/formatting.md\",\n    content=\"Always use tabs, not spaces.\",\n)\n\nclient.beta.memory_stores.memories.update(\n    mem.id,\n    memory_store_id=store.id,\n    path=\"/archive/2026_q1_formatting.md\",  # rename\n)\n```\n\n### Optimistic concurrency (precondition on `update`)\n\n`memories.update` accepts a `precondition` so you can read → modify → write back without clobbering a concurrent writer. The only supported type is `content_sha256`. On mismatch the API returns `409` (`memory_precondition_failed_error`) — re-read and retry against fresh state.\n\n```python\nclient.beta.memory_stores.memories.update(\n    mem.id,\n    memory_store_id=store.id,\n    content=\"CORRECTED: Always use 2-space indentation.\",\n    precondition={\"type\": \"content_sha256\", \"content_sha256\": mem.content_sha256},\n)\n```\n\n### Delete\n\n```python\nclient.beta.memory_stores.memories.delete(mem.id, memory_store_id=store.id)\n```\n\nPass `expected_content_sha256` for a conditional delete.\n\n## Audit and rollback — memory versions\n\nEvery mutation creates an immutable `memver_...` snapshot. Versions accumulate for the lifetime of the parent memory; `memories.retrieve` always returns the current head, the version endpoints give you history.\n\n| Operation that triggers it | `operation` field on the version |\n| --- | --- |\n| `memories.create` at a new path | `\"created\"` |\n| `memories.update` changing `content`, `path`, or both (or an agent-side write to the mount) | `\"modified\"` |\n| `memories.delete` | `\"deleted\"` |\n\nEach version also records `created_by` — an actor object with `type` ∈ `session_actor` / `api_actor` / `user_actor` — and, after redaction, `redacted_at` + `redacted_by`.\n\n### List versions\n\nNewest-first, paginated. Filter by `memory_id`, `operation`, `session_id`, `api_key_id`, or `created_at_gte` / `created_at_lte`. Pass `view=\"full\"` to include `content`; default is metadata-only.\n\n```python\nfor v in client.beta.memory_stores.memory_versions.list(store.id, memory_id=mem.id):\n    print(f\"{v.id}: {v.operation}\")\n```\n\n### Retrieve a version\n\n```python\nversion = client.beta.memory_stores.memory_versions.retrieve(\n    version_id, memory_store_id=store.id\n)\nprint(version.content)\n```\n\n### Redact a version\n\nScrubs content from a historical version while preserving the audit trail (actor + timestamps). Clears `content`, `content_sha256`, `content_size_bytes`, and `path`; everything else stays. Use for leaked secrets, PII, or user-deletion requests.\n\n```python\nclient.beta.memory_stores.memory_versions.redact(version_id, memory_store_id=store.id)\n```\n\n## Endpoint reference\n\nSee `shared/managed-agents-api-reference.md` → Memory Stores / Memories / Memory Versions for the full HTTP method/path tables. Raw HTTP base path:\n\n```\nPOST   /v1/memory_stores\nPOST   /v1/memory_stores/{memory_store_id}/archive\nGET    /v1/memory_stores/{memory_store_id}/memories\nPATCH  /v1/memory_stores/{memory_store_id}/memories/{memory_id}\nGET    /v1/memory_stores/{memory_store_id}/memory_versions\nPOST   /v1/memory_stores/{memory_store_id}/memory_versions/{version_id}/redact\n```\n\nFor cURL examples and the CLI (`ant beta:memory-stores ...`), WebFetch the Memory URL in `shared/live-sources.md` → Managed Agents.\n</doc>\n\n<doc path=\"shared/managed-agents-multiagent.md\">\n# Managed Agents — Multiagent Sessions\n\nA coordinator agent can delegate to other agents within one session. All agents **share the container and filesystem**; each runs in its own **thread** — a context-isolated event stream with its own conversation history, model, system prompt, tools, MCP servers, and skills (from that agent's own config). Threads are persistent: the coordinator can send a follow-up to a subagent it called earlier and that subagent retains its prior turns.\n\nThe SDK sets the `managed-agents-2026-04-01` beta header automatically on all `client.beta.{agents,sessions}.*` calls; no additional header is required for multiagent.\n\n---\n\n## Declare the roster on the coordinator\n\n`multiagent` is a **top-level field** on `agents.create()` / `agents.update()` — **not** a `tools[]` entry. `agents` lists 1–20 roster entries. Nothing changes on `sessions.create()` — the roster is resolved from the coordinator's config.\n\n```python\norchestrator = client.beta.agents.create(\n    name=\"Engineering Lead\",\n    model=\"claude-opus-4-8\",\n    system=\"You coordinate engineering work. Delegate code review to the reviewer and test writing to the test agent.\",\n    tools=[{\"type\": \"agent_toolset_20260401\"}],\n    multiagent={\n        \"type\": \"coordinator\",\n        \"agents\": [\n            reviewer.id,                                            # bare string — latest version\n            {\"type\": \"agent\", \"id\": test_writer.id, \"version\": 4},  # pinned version\n            {\"type\": \"self\"},                                       # the coordinator itself\n        ],\n    },\n)\n\nsession = client.beta.sessions.create(agent=orchestrator.id, environment_id=env.id)\n```\n\n| Roster entry | Shape | Notes |\n|---|---|---|\n| String shorthand | `\"agent_abc123\"` | References the latest version of a stored agent. |\n| Agent reference | `{type: \"agent\", id, version?}` | Omit `version` to pin the latest at coordinator save time. |\n| Self | `{type: \"self\"}` | The coordinator can spawn copies of itself. |\n\nIf the session was created with `agent_with_overrides` (see `shared/managed-agents-core.md` → Override agent configuration for a session), those overrides apply to the **coordinator and its `self` copies**. Roster agents referenced by ID always use their own as-created configuration — overrides do not propagate to them.\n\nUp to **20 unique agents** in the roster; the coordinator may spawn **multiple copies** of each. **One level of delegation only** — depth > 1 is ignored.\n\n---\n\n## Threads\n\nThe session-level event stream is the **primary thread** — it shows the coordinator's trace plus a condensed view of subagent activity (thread status transitions and cross-thread messages, not every subagent tool call). Drill into a specific subagent via the per-thread endpoints:\n\n| Operation | HTTP | SDK (`client.beta.sessions.threads.*`) |\n|---|---|---|\n| List threads | `GET /v1/sessions/{sid}/threads` | `.list(session_id)` |\n| Retrieve one | `GET /v1/sessions/{sid}/threads/{tid}` | `.retrieve(thread_id, session_id=...)` |\n| Archive | `POST /v1/sessions/{sid}/threads/{tid}/archive` | `.archive(thread_id, session_id=...)` |\n| List thread events | `GET /v1/sessions/{sid}/threads/{tid}/events` | `.events.list(thread_id, session_id=...)` |\n| Stream thread events | `GET /v1/sessions/{sid}/threads/{tid}/stream` | `.events.stream(thread_id, session_id=...)` |\n\nEach `SessionThread` carries `id`, `status` (`running` | `idle` | `rescheduling` | `terminated`), `agent` (a resolved snapshot of the agent config — `id`, `name`, `model`, `system`, `tools`, `skills`, `mcp_servers`, `version`), `parent_thread_id` (null for the primary thread, which is included in the list), `archived_at`, and optional `stats`/`usage`. **Session status aggregates thread statuses** — if any thread is `running`, `session.status` is `running`. Max **25 concurrent threads**. When draining a per-thread stream, break on `session.thread_status_idle` (and check its `stop_reason` as you would for the session-level idle).\n\n---\n\n## Multiagent events (on the session stream)\n\n| Event | Payload highlights | Meaning |\n|---|---|---|\n| `session.thread_created` | `session_thread_id`, `agent_name` | A new thread was created. |\n| `session.thread_status_running` | `session_thread_id`, `agent_name` | Thread started activity. |\n| `session.thread_status_idle` | `session_thread_id`, `agent_name`, **`stop_reason`** | Thread is awaiting input. Inspect `stop_reason` (same shape as `session.status_idle.stop_reason`). |\n| `session.thread_status_rescheduled` | `session_thread_id`, `agent_name` | Thread is rescheduling after a retryable error. |\n| `session.thread_status_terminated` | `session_thread_id`, `agent_name` | Thread was archived or hit a terminal error. |\n| `agent.thread_message_sent` | `to_session_thread_id`, `to_agent_name`, `content` | Coordinator sent a follow-up to another thread. |\n| `agent.thread_message_received` | `from_session_thread_id`, `from_agent_name`, `content` | An agent delivered its result to the coordinator. |\n\n---\n\n## Tool permissions and custom tools from subagent threads\n\nWhen a subagent needs your client (an `always_ask` confirmation, or a custom tool result), the request is **cross-posted to the primary thread** with `session_thread_id` identifying the originating thread — so you only need to watch the session stream. Reply with `user.tool_confirmation` (carrying `tool_use_id`) or `user.custom_tool_result` (carrying `custom_tool_use_id`), and **echo the `session_thread_id` from the originating event** (the SDK param type and docstring expect it). The server also routes by the tool-use ID, so the echo is belt-and-suspenders rather than load-bearing — but include it.\n\n```python\nfor event_id in stop.event_ids:\n    pending = events_by_id[event_id]\n    confirmation = {\n        \"type\": \"user.tool_confirmation\",\n        \"tool_use_id\": event_id,\n        \"result\": \"allow\",\n    }\n    if pending.session_thread_id is not None:\n        confirmation[\"session_thread_id\"] = pending.session_thread_id\n    client.beta.sessions.events.send(session.id, events=[confirmation])\n```\n\nThe same pattern applies to `user.custom_tool_result`.\n\n---\n\n## Pitfalls\n\n- **Don't put the roster on `sessions.create()` or in `tools[]`.** `multiagent` is a top-level agent field; update the coordinator, then start a session that references it.\n- **Don't assume shared context.** Threads share the filesystem but not conversation history or tools. If the coordinator needs a subagent to act on something, it must say so in the delegated message (or write it to disk).\n- **Depth > 1 is ignored.** A subagent's own `multiagent` roster (if any) doesn't cascade — only the session's coordinator delegates.\n\nFor per-language bindings beyond Python, WebFetch `https://platform.claude.com/docs/en/managed-agents/multi-agent.md` (see `shared/live-sources.md`).\n</doc>\n\n<doc path=\"shared/managed-agents-onboarding.md\">\n# Managed Agents — Onboarding Flow\n\n> **Invoked via `/claude-api managed-agents-onboard`?** You're in the right place. Run the interview below — don't summarize it back to the user, ask the questions.\n\nClaude Managed Agents is a hosted agent: Anthropic runs the agent loop and provisions a sandboxed container per session where the agent's tools execute (or your own worker, with a `self_hosted` environment — see `shared/managed-agents-self-hosted-sandboxes.md`). You supply an **agent config** (tools, skills, model, system prompt — reusable, versioned) and an **environment config** (the sandbox — reusable across agents). Each run is a **session**.\n\nThe flow is four beats — **describe → agent → environment → session** — the same arc as the Console quickstart, and the same philosophy: **value before credentials**. The user goes from idea to a runnable session before any auth ask; each credential is *flagged* at the moment the design makes it relevant (§2) and *collected* once, at session setup (§4), where it binds (`sessions.create()`) and gets exercised (smoke-test). Read `shared/managed-agents-core.md` alongside this — it has full detail for each knob; this doc is the interview script.\n\n---\n\n## 1. Describe the task\n\n**Open with a one-breath signpost and a single open prompt — don't guess, don't questionnaire.** In your own words:\n\n> Managed Agents is hosted — Anthropic runs the agent loop, the sandbox, and the infrastructure; you just define the agent. We'll do this in three moves: the agent, the environment it runs in, then a live test session. So: describe the agent you want — what should it do, and what kicks it off (a person, an event, a schedule)?\n\nLet them answer in full before configuring anything.\n\n## 2. Configure the agent — propose, don't interrogate\n\nTheir description does the interview's work. Draft the agent config from it and **present it as a proposal with your suggestions inline** — the user reacts to a concrete config instead of answering a question list. At most one batched follow-up for true gaps. Suggest where the description gives you an opening:\n\n- **Tools** — enable the full prebuilt toolset by default (`agent_toolset_20260401`: `bash`, `read`, `write`, `edit`, `glob`, `grep`, `web_fetch`, `web_search`). **Suggest MCP servers** for any third-party service the job names (GitHub, Linear, Slack, …) — and flag the credential each one implies as you suggest it (\"Linear MCP → you'll need a Linear API token at kickoff\"), so §4's auth step is a formality, not a surprise. Collection itself waits for §4. Custom tools only if the user's own app must answer calls (name, description, input schema — their handler code is theirs; don't generate it).\n- **Skills** — **suggest** prebuilt `xlsx`/`docx`/`pptx`/`pdf` when the job produces those artifacts; custom by `skill_id` (max 20 total per agent, prebuilt + custom combined).\n- **Outcome** — if the description implies checkable \"done\" criteria (or you can elicit them in the follow-up: not \"a good report\" but \"a CSV with a numeric `price` column per SKU\"), **suggest an Outcome kickoff** — the harness grades and iterates against a rubric (`shared/managed-agents-outcomes.md`).\n- **On-hand resources** — repos on disk (`github_repository`: URL, optional `mount_path`/`checkout`; token comes in §4), files to seed (Files API upload → `{type: \"file\", file_id, mount_path}`; read-only), if the job references them.\n- **Model** — default `claude-opus-4-8`; `claude-fable-5` for the hardest long-horizon work (`shared/model-migration.md` → Migrating to Claude Fable 5).\n\n> ‼️ **PR creation needs the GitHub MCP server too** — a `github_repository` mount is filesystem-only. Edit in the mount → push branch via `bash` → open the PR via the MCP `create_pull_request` tool.\n\nFull detail per knob: `shared/managed-agents-tools.md` (toolset, MCP, custom tools, skills), `shared/managed-agents-environments.md` (repos, files).\n\n## 3. Environment\n\nUsually zero or one question:\n\n- **Reuse or create?** Environments are shared across agents — check for an existing one first.\n- **Networking** — default unrestricted egress. Switch to `limited` only if the user wants egress control — then set `allow_mcp_servers: true` or list every MCP server domain in `allowed_hosts`, or those tools fail silently.\n- **Suggest `self_hosted`** when the signals are there: tools must run on their own infra, secrets can't leave it, or they need binaries/data the cloud container won't have (`shared/managed-agents-self-hosted-sandboxes.md`; not available on Claude Platform on AWS). Otherwise `cloud` — don't raise it unprompted for simple jobs.\n\n## 4. Session — auth, then test run\n\n**Auth happens here — collect the credentials flagged in §2, now that the config is settled:** a vault (existing or `vaults.create()`) + `vaults.credentials.create()` for each MCP server declared in §2, `environment_variable` credentials for API keys the job uses (substituted at egress; the sandbox sees a placeholder), and the `authorization_token` for each repo mount. Credentials are write-only; MCP credentials match servers by URL and auto-refresh. See `shared/managed-agents-tools.md` → Vaults.\n\n**Silent viability gate — run this yourself before emitting anything; surface only the gaps.** Walk the job clause by clause: every verb maps to an enabled tool or MCP server (\"open a PR\" → GitHub MCP, not just the mount); every MCP server and repo mount has its credential from the auth step; every external host is reachable under the networking choice; every file/repo/dataset the job references is mounted; \"done\" is checkable. If something's missing, say so and resolve it — don't emit a config you already know is under-resourced.\n\n**Kickoff — pick one, never both:**\n- `user.message` — conversational.\n- `user.define_outcome` + rubric — when §2 settled on an Outcome; the harness iterates and grades until the rubric passes.\n- **Scheduled shape?** Skip per-session kickoff entirely — create a **deployment** (`deployments.create()` with `schedule` + `initial_events`); each firing creates the session autonomously. See `shared/managed-agents-scheduled-deployments.md`.\n\nMechanics to bake into the runtime code: session creation blocks until resources mount (bad mounts surface there, before tokens); open the event stream *before* sending the kickoff; break on `session.status_terminated`, or `session.status_idle` with a terminal `stop_reason` — anything except `requires_action` (`shared/managed-agents-client-patterns.md` Pattern 5); usage lands on `span.model_request_end`; artifacts land in `/mnt/session/outputs/` (`files.list({scope_id: session.id, ...})`).\n\n## 5. Integrate — emit the code\n\nGo straight from the last answer to the code — no preamble, no lecture about setup-vs-runtime; the two-block structure shows it. Generate **two clearly-separated blocks**:\n\n**Block 1 — Setup (run once, store the IDs).** Prefer **YAML files + `ant` CLI** — agents and environments are version-controlled definitions users should check in and apply from CI:\n\n1. `<name>.agent.yaml` (flat: `name`, `model`, `system`, `tools`, `mcp_servers`, `skills`) and `<name>.environment.yaml`\n2. ```sh\n   AGENT_ID=$(ant beta:agents create < <name>.agent.yaml --transform id -r)\n   ENV_ID=$(ant beta:environments create < <name>.environment.yaml --transform id -r)\n   # CI sync: ant beta:agents update --agent-id \"$AGENT_ID\" --version N < <name>.agent.yaml\n   ```\n\nSDK fallback if the user asks — and **required on Claude Platform on AWS**, where auth is SigV4 and the `ant` CLI has no SigV4 mode (use the platform client from `shared/claude-platform-on-aws.md`): label it `# ONE-TIME SETUP — run once, save the IDs` and call `environments.create()` → `agents.create()`.\n\n> ⚠️ **Deployments are newer than the rest of the MA surface.** Before emitting `ant beta:deployments …` or `client.beta.deployments` / `client.beta.deployment_runs` calls, verify the user's installed CLI/SDK exposes them (`ant beta:deployments --help`; `hasattr(client.beta, \"deployments\")`). If not, emit raw HTTP against `POST /v1/deployments` with the `managed-agents-2026-04-01` beta header (plus `oauth-2025-04-20` when authenticating with a Bearer token from `ant auth print-credentials`), and leave an upgrade note marking what simplifies to SDK calls.\n\n**Scheduled shape? The deployment is setup, not runtime.** Create it in Block 1, after the agent/environment IDs exist (`deployments.create()` with `schedule` + `initial_events`). Block 2 is then **not** a session loop — there is no per-run kickoff to send. Emit instead: a manual-run trigger (`POST /v1/deployments/{id}/run`) so the user can test now rather than wait for the first firing — the manual run doubles as the smoke test — plus a fetch helper (latest `deployment_runs` entry → `session_id` → Console URL + `files.list(scope_id=session_id)` for the artifacts).\n\n**Block 2 — Runtime (every invocation; conversational and Outcome shapes).** SDK code in the detected language (Python/TS/cURL — SKILL.md → Language Detection); don't emit shell loops here:\n\n1. Load `agent_id` + `env_id` from config/env\n2. `sessions.create(agent=AGENT_ID, environment_id=ENV_ID, resources=[...], vault_ids=[...])`, then print the Console URL so the user can watch live: `https://platform.claude.com/workspaces/default/sessions/{session.id}` (swap `default` for their workspace slug)\n3. **Smoke-test when the job depends on MCP servers, credentials, or locked-down hosts** — those failures don't surface at `sessions.create()`, only on first use. One cheap probe turn (\"Confirm you can reach <service> and list 1–2 items; don't start the task\"), verify, then send the real kickoff. Skip when there are no external dependencies.\n4. Open stream → send the §4 kickoff → loop with the terminal gate from §4.\n\n> ⚠️ **Never emit `agents.create()` and `sessions.create()` in the same unguarded block** — that teaches creating a new agent per run, the #1 anti-pattern. Single-script requests: wrap creation in `if not os.getenv(\"AGENT_ID\"):`.\n\nPull exact syntax from `{lang}/managed-agents/README.md` for your detected language (cURL and C#: use `curl/managed-agents.md` as the wire-level reference). Don't invent field names.\n</doc>\n\n<doc path=\"shared/managed-agents-outcomes.md\">\n# Managed Agents — Outcomes\n\nAn **outcome** elevates a session from *conversation* to *work*: you state what \"done\" looks like, and the harness runs an iterate → grade → revise loop until the artifact meets the rubric, hits `max_iterations`, or is interrupted. A separate **grader** (independent context window) scores each iteration against your rubric and feeds per-criterion gaps back to the agent.\n\nThe SDK sets the `managed-agents-2026-04-01` beta header automatically on all `client.beta.sessions.*` calls; no additional header is required for outcomes.\n\n---\n\n## The `user.define_outcome` event\n\nOutcomes are not a field on `sessions.create()`. You create a normal session, then send a `user.define_outcome` event. The agent starts working on receipt — **do not also send a `user.message`** to kick it off.\n\n```python\nsession = client.beta.sessions.create(\n    agent=AGENT_ID,\n    environment_id=ENVIRONMENT_ID,\n    title=\"Financial analysis on Costco\",\n)\n\nclient.beta.sessions.events.send(\n    session_id=session.id,\n    events=[\n        {\n            \"type\": \"user.define_outcome\",\n            \"description\": \"Build a DCF model for Costco in .xlsx\",\n            \"rubric\": {\"type\": \"text\", \"content\": RUBRIC_MD},\n            # or: \"rubric\": {\"type\": \"file\", \"file_id\": rubric.id}\n            \"max_iterations\": 5,  # optional; default 3, max 20\n        }\n    ],\n)\n```\n\n| Field | Type | Notes |\n|---|---|---|\n| `type` | `\"user.define_outcome\"` | |\n| `description` | string | The task. This is what the agent works toward — no separate `user.message` needed. |\n| `rubric` | `{type: \"text\", content}` \\| `{type: \"file\", file_id}` | **Required.** Markdown with explicit, independently gradeable criteria. Upload once via `client.beta.files.upload(...)` (beta `files-api-2025-04-14`) to reuse across sessions. |\n| `max_iterations` | int | Optional. Default **3**, max **20**. |\n\nThe event is echoed back on the stream with a server-assigned `outcome_id` and `processed_at`.\n\n> **Writing rubrics.** Use explicit, gradeable criteria (\"CSV has a numeric `price` column\"), not vibes (\"data looks good\") — the grader scores each criterion independently, so vague criteria produce noisy loops. If you don't have a rubric, have Claude analyze a known-good artifact and turn that analysis into one.\n\n---\n\n## Outcome-specific events\n\nThese appear on the standard event stream (`sessions.events.stream` / `.list`) alongside the usual `agent.*` / `session.*` events.\n\n| Event | Payload highlights | Meaning |\n|---|---|---|\n| `span.outcome_evaluation_start` | `outcome_id`, `iteration` (0-indexed) | Grader began scoring iteration *N*. |\n| `span.outcome_evaluation_ongoing` | `outcome_id` | Heartbeat while the grader runs. Grader reasoning is opaque — you see *that* it's working, not *what* it's thinking. |\n| `span.outcome_evaluation_end` | `outcome_evaluation_start_id`, `outcome_id`, `iteration`, `result`, `explanation`, `usage` | Grader finished one iteration. `result` drives what happens next (table below). |\n\n### `span.outcome_evaluation_end.result`\n\n| `result` | Next |\n|---|---|\n| `satisfied` | Session → `idle`. Terminal for this outcome. |\n| `needs_revision` | Agent starts another iteration. |\n| `max_iterations_reached` | No further grader cycles. Agent may run one final revision, then session → `idle`. |\n| `failed` | Session → `idle`. Rubric fundamentally doesn't match the task (e.g. description and rubric contradict). |\n| `interrupted` | Only emitted if `_start` had already fired before a `user.interrupt` arrived. |\n\n```json\n{\n  \"type\": \"span.outcome_evaluation_end\",\n  \"id\": \"sevt_01jkl...\",\n  \"outcome_evaluation_start_id\": \"sevt_01def...\",\n  \"outcome_id\": \"outc_01a...\",\n  \"result\": \"satisfied\",\n  \"explanation\": \"All 12 criteria met: revenue projections use 5 years of historical data, ...\",\n  \"iteration\": 0,\n  \"usage\": { \"input_tokens\": 2400, \"output_tokens\": 350, \"cache_creation_input_tokens\": 0, \"cache_read_input_tokens\": 1800 },\n  \"processed_at\": \"2026-03-25T14:03:00Z\"\n}\n```\n\n---\n\n## Checking status & retrieving deliverables\n\n**Status** — either watch the stream for `span.outcome_evaluation_end`, or poll the session and read `outcome_evaluations`:\n\n```python\nsession = client.beta.sessions.retrieve(session.id)\nfor ev in session.outcome_evaluations:\n    print(f\"{ev.outcome_id}: {ev.result}\")  # outc_01a...: satisfied\n```\n\n**Deliverables** — the agent writes to `/mnt/session/outputs/`. Once idle, fetch via the Files API with `scope_id=session.id`. This is the same session-outputs mechanism documented in `shared/managed-agents-environments.md` → Session outputs (including the dual-beta-header requirement on `files.list`).\n\n---\n\n## Interaction rules & pitfalls\n\n- **One outcome at a time.** Chain by sending the next `user.define_outcome` only after the previous one's terminal `span.outcome_evaluation_end` (`satisfied` / `max_iterations_reached` / `failed` / `interrupted`). The session retains history across chained outcomes.\n- **Steering is allowed but optional.** You *may* send `user.message` events mid-outcome to nudge direction, but the agent already knows to keep working until terminal — don't send \"keep going\" prompts.\n- **`user.interrupt` pauses the current outcome** — it marks `result: \"interrupted\"` and leaves the session `idle`, ready for a new outcome or conversational turn.\n- **After terminal, the session is reusable** — continue conversationally or define a new outcome.\n- **Outcome ≠ session-create field.** Don't put `outcome`, `rubric`, or `description` on `sessions.create()` — outcomes are always sent as a `user.define_outcome` event.\n- **Idle-break gate is unchanged.** In your drain loop, keep using `event.type === 'session.status_idle' && event.stop_reason?.type !== 'requires_action'` — do **not** gate on `span.outcome_evaluation_end` alone (on `needs_revision` the session keeps running). See `shared/managed-agents-client-patterns.md` Pattern 5.\n\nFor the raw HTTP shapes and per-language SDK bindings beyond Python, WebFetch `https://platform.claude.com/docs/en/managed-agents/define-outcomes.md` (see `shared/live-sources.md`).\n</doc>\n\n<doc path=\"shared/managed-agents-overview.md\">\n# Managed Agents — Overview\n\nManaged Agents provisions a container per session as the agent's workspace. The agent loop runs on Anthropic's orchestration layer; the container is where the agent's *tools* execute — bash commands, file operations, code. You create a persisted **Agent** config (model, system prompt, tools, MCP servers, skills), then start **Sessions** that reference it. The session streams events back to you; you send user messages and tool results in.\n\n## ⚠️ THE MANDATORY FLOW: Agent (once) → Session (every run)\n\n**Why agents are separate objects: versioning.** An agent is a persisted, versioned config — every update creates a new immutable version, and sessions pin to a version at creation time. This lets you iterate on the agent (tweak the prompt, add a tool) without breaking sessions already running, roll back if a change regresses, and A/B test versions side-by-side. None of that works if you `agents.create()` fresh on every run.\n\nEvery session references a pre-created `/v1/agents` object. Create the agent once, store the ID, and reuse it across runs.\n\n| Step | Call | Frequency |\n|---|---|---|\n| 1 | `POST /v1/agents` — `model`, `system`, `tools`, `mcp_servers`, `skills` live here | **ONCE.** Store `agent.id` **and** `agent.version`. |\n| 2 | `POST /v1/sessions` — `agent: \"agent_abc123\"` or `{type: \"agent\", id, version}` | **Every run.** String shorthand uses latest version. |\n\nIf you're about to write `sessions.create()` with `model`, `system`, or `tools` on the session body — **stop**. Those fields live on `agents.create()`. The session takes a *pointer* only.\n\n**When generating code, separate setup from runtime.** `agents.create()` belongs in a setup script (or a guarded `if agent_id is None:` block), not at the top of the hot path. If the user's code calls `agents.create()` on every invocation, they're accumulating orphaned agents and paying the create latency for nothing. The correct shape is: create once → persist the ID (config file, env var, secrets manager) → every run loads the ID and calls `sessions.create()`.\n\n**To change the agent's behavior, use `POST /v1/agents/{id}` — don't create a new one.** Each update bumps the version; running sessions keep their pinned version, new sessions get the latest (or pin explicitly via `{type: \"agent\", id, version}`). See `shared/managed-agents-core.md` → Agents → Versioning. To change `tools`/`mcp_servers`/`vault_ids` on **one running session** without touching the agent object, use `sessions.update()` — see `shared/managed-agents-core.md` → Updating the agent configuration mid-session.\n\n## Beta Headers\n\nManaged Agents is in beta. The SDK sets required beta headers automatically:\n\n| Beta Header                    | What it enables                                      |\n| ------------------------------ | ---------------------------------------------------- |\n| `managed-agents-2026-04-01`    | Agents, Environments, Sessions, Events, Session Resources, Session Threads, Outcomes, Multiagent, Vaults, Credentials, Memory Stores, Deployments |\n| `skills-2025-10-02`            | Skills API (for managing custom skill definitions)   |\n| `files-api-2025-04-14`         | Files API for file uploads                           |\n\n**Which beta header goes where:** The SDK sets `managed-agents-2026-04-01` automatically on `client.beta.{agents,environments,sessions,vaults,memory_stores,deployments,deployment_runs}.*` calls, and `files-api-2025-04-14` / `skills-2025-10-02` automatically on `client.beta.files.*` / `client.beta.skills.*` calls. You do NOT need to add the Skills or Files beta header when calling Managed Agents endpoints. **Exception — session-scoped file listing:** `client.beta.files.list({scope_id: session.id})` is a Files endpoint that takes a Managed Agents parameter, so it needs **both** headers. Pass `betas: [\"managed-agents-2026-04-01\"]` explicitly on that call (the SDK adds the Files header; you add the Managed Agents one). See `shared/managed-agents-environments.md` → Session outputs.\n\n\n## Reading Guide\n\n| User wants to...                       | Read these files                                        |\n| -------------------------------------- | ------------------------------------------------------- |\n| **Get started from scratch / \"help me set up an agent\"** | `shared/managed-agents-onboarding.md` — guided interview (WHERE→WHO→WHAT→WATCH), then emit code |\n| Understand how the API works           | `shared/managed-agents-core.md`                         |\n| See the full endpoint reference        | `shared/managed-agents-api-reference.md`                |\n| **Create an agent** (required first step) | `shared/managed-agents-core.md` (Agents section) + language file |\n| Update/version an agent                | `shared/managed-agents-core.md` (Agents → Versioning) — update, don't re-create |\n| Create a session                       | `shared/managed-agents-core.md` + `{lang}/managed-agents/README.md` (cURL/C#: `curl/managed-agents.md`) |\n| Configure tools and permissions        | `shared/managed-agents-tools.md`                        |\n| Set up MCP servers                     | `shared/managed-agents-tools.md` (MCP Servers section)  |\n| Stream events / handle tool_use        | `shared/managed-agents-events.md` + language file       |\n| Get notified of session state changes via webhook (no polling) | `shared/managed-agents-webhooks.md` — Console-registered endpoint, HMAC verify, thin payload + fetch |\n| Define an outcome / rubric-graded iterate loop | `shared/managed-agents-outcomes.md` — `user.define_outcome` event, grader, `span.outcome_evaluation_*` events |\n| Coordinate multiple agents / subagents / threads | `shared/managed-agents-multiagent.md` — `multiagent: {type: \"coordinator\", agents: [...]}` on the agent, session threads, cross-posted tool confirmations |\n| Set up environments                    | `shared/managed-agents-environments.md` + language file |\n| Run tool execution in your own infra / VPC (self-hosted sandbox) | `shared/managed-agents-self-hosted-sandboxes.md` — `config:{type:\"self_hosted\"}`, `ANTHROPIC_ENVIRONMENT_KEY`, `EnvironmentWorker.run()` / `ant beta:worker poll` |\n| Upload files / attach repos            | `shared/managed-agents-environments.md` (Resources)     |\n| Give agents persistent memory across sessions | `shared/managed-agents-memory.md` — memory stores, `memory_store` session resource, preconditions, versions/redact |\n| Define agents/environments as version-controlled YAML; drive the API from the shell | `shared/anthropic-cli.md` — `ant beta:agents create < agent.yaml`, `--transform`, `@file` inlining |\n| Store credentials (MCP auth, API keys for CLIs/SDKs) | `shared/managed-agents-tools.md` (Vaults section) — `mcp_oauth` / `static_bearer` / `environment_variable` |\n| Call a non-MCP API / CLI that needs a secret | `shared/managed-agents-tools.md` (Vaults section) — `environment_variable` credential, substituted at egress. If that doesn't fit (e.g. self-hosted sandboxes), `shared/managed-agents-client-patterns.md` Pattern 9 keeps the secret host-side via a custom tool |\n| Run an agent on a recurring cron schedule | `shared/managed-agents-scheduled-deployments.md` — deployments, deployment runs, pause/auto-pause |\n\n## Common Pitfalls\n\n- **Agent FIRST, then session — NO EXCEPTIONS** — the session's `agent` field accepts **only** a string ID or `{type: \"agent\", id, version}`. `model`, `system`, `tools`, `mcp_servers`, `skills` are **top-level fields on `POST /v1/agents`**, never on `sessions.create()`. If the user hasn't created an agent, that is step zero of every example.\n- **Agent ONCE, not every run** — `agents.create()` is a setup step. Store the returned `agent_id` and reuse it; don't call `agents.create()` at the top of your hot path. If the agent's config needs to change, `POST /v1/agents/{id}` — each update creates a new version, and sessions can pin to a specific version for reproducibility.\n- **MCP auth goes through vaults** — the agent's `mcp_servers` array declares `{type, name, url}` only (no auth). Credentials live in vaults (`client.beta.vaults.credentials.create`) and attach to sessions via `vault_ids`. Anthropic auto-refreshes OAuth tokens using the stored refresh token. Vaults also hold `environment_variable` credentials for non-MCP services (CLIs, SDKs, direct API calls) — substituted at egress, never visible in the sandbox.\n- **Reconcile resources before the first run** — a session with a clear ask but a missing tool, credential, data mount, or context will discover the gap mid-run, then flail and give up. Before creating the session, check that every action in the task maps to a configured tool/MCP server, every MCP server has a vault credential, and every referenced file/host is mounted/reachable. When helping a user set one up, run the reconciliation in `shared/managed-agents-onboarding.md` → §3 Pre-flight viability check.\n- **Stream to get events** — `GET /v1/sessions/{id}/events/stream` is the primary way to receive agent output in real-time.\n- **SSE stream has no replay — reconnect with consolidation** — if the stream drops while a `agent.tool_use`, `agent.mcp_tool_use`, or `agent.custom_tool_use` is pending resolution (`user.tool_confirmation` for the first two, `user.custom_tool_result` for the last one), the session deadlocks (client disconnects → session idles → reconnect happens → no client resolution happens). On every (re)connect: open stream with `GET /v1/sessions/{id}/events/stream` , fetch `GET /v1/sessions/{id}/events`, dedupe by event ID, then proceed. See `shared/managed-agents-events.md` → Reconnecting after a dropped stream.\n- **Don't trust HTTP-library timeouts as wall-clock caps** — `requests` `timeout=(c, r)` and `httpx.Timeout(n)` are *per-chunk* read timeouts; they reset every byte, so a trickling connection can block indefinitely. For a hard deadline on raw-HTTP polling, track `time.monotonic()` at the loop level and bail explicitly. Prefer the SDK's `sessions.events.stream()` / `session.events.list()` over hand-rolled HTTP. See `shared/managed-agents-events.md` → Receiving Events.\n- **Messages queue** — you can send events while the session is `running` or `idle`; they're processed in order. No need to wait for a response before sending the next message.\n- **Environment `config.type` is `\"cloud\"` or `\"self_hosted\"`** — `cloud` runs the container on Anthropic's infrastructure; `self_hosted` moves tool execution to your own (see `shared/managed-agents-self-hosted-sandboxes.md`).\n- **Archive is permanent on every resource** — archiving an agent, environment, session, vault, credential, or memory store makes it read-only with no unarchive. For agents, environments, and memory stores specifically, archived resources cannot be referenced by new sessions (existing sessions continue). Do not call `.archive()` on a production agent, environment, or memory store as cleanup — **always confirm with the user before archiving**.\n</doc>\n\n<doc path=\"shared/managed-agents-scheduled-deployments.md\">\n# Managed Agents — Scheduled Deployments\n\nA **scheduled deployment** runs an agent on a recurring cron schedule — each firing creates a session autonomously. Use it for predictable-cadence work: nightly triage, weekly compliance scans, hourly monitors.\n\nRequires the `managed-agents-2026-04-01` beta header (the SDK sets it automatically for `client.beta.deployments.*` / `client.beta.deployment_runs.*` calls).\n\n## Create a deployment\n\nA deployment bundles everything a session needs (agent, environment, optional files / GitHub / memory stores / vaults) plus a `schedule` and the `initial_events` that kick off each run:\n\n- `agent` and `environment_id` are required — same shapes as `sessions.create` (see `shared/managed-agents-core.md`).\n- `initial_events` must contain the starting `user.message`.\n- `schedule` takes a cron `expression` and an IANA `timezone`. Minute-level granularity is the maximum.\n\n```bash\ncurl -fsSL https://api.anthropic.com/v1/deployments \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\" \\\n  -H \"anthropic-beta: managed-agents-2026-04-01\" \\\n  -H \"content-type: application/json\" \\\n  -d @- <<EOF\n{\n  \"name\": \"Weekly compliance scan\",\n  \"agent\": \"$AGENT_ID\",\n  \"environment_id\": \"$ENVIRONMENT_ID\",\n  \"initial_events\": [\n    {\"type\": \"user.message\", \"content\": [{\"type\": \"text\", \"text\": \"Run the weekly compliance scan.\"}]}\n  ],\n  \"schedule\": {\n    \"type\": \"cron\",\n    \"expression\": \"0 20 * * 5\",\n    \"timezone\": \"America/New_York\"\n  }\n}\nEOF\n```\n\n```python\ndeployment = client.beta.deployments.create(\n    name=\"Weekly compliance scan\",\n    agent=agent.id,\n    environment_id=environment.id,\n    initial_events=[\n        {\n            \"type\": \"user.message\",\n            \"content\": [{\"type\": \"text\", \"text\": \"Run the weekly compliance scan.\"}],\n        },\n    ],\n    schedule={\n        \"type\": \"cron\",\n        \"expression\": \"0 20 * * 5\",\n        \"timezone\": \"America/New_York\",\n    },\n)\n```\n\nThe response is a deployment object (`depl_` ID prefix). Check `schedule.upcoming_runs_at` — the next fire times — to confirm the schedule parses the way you intended:\n\n```json\n{\n  \"id\": \"depl_01xyz\",\n  \"status\": \"active\",\n  \"paused_reason\": null,\n  \"schedule\": {\n    \"type\": \"cron\",\n    \"expression\": \"0 20 * * 5\",\n    \"timezone\": \"America/New_York\",\n    \"last_run_at\": null,\n    \"upcoming_runs_at\": [\"2026-05-09T00:00:00Z\", \"2026-05-16T00:00:00Z\", \"2026-05-23T00:00:00Z\"]\n  }\n}\n```\n\nDeployments may apply up to **10 seconds of jitter** to distribute load. Maximum **1000 scheduled deployments per organization** (contact Anthropic support for more).\n\n### Cron and timezone semantics\n\n- **Expression:** standard POSIX cron (`minute hour day-of-month month day-of-week`).\n- **Timezone:** IANA identifier (e.g. `\"America/Los_Angeles\"`).\n- **DST:** literal wall-clock matching — `\"0 20 * * *\"` in `America/New_York` fires at 8:00 PM local regardless of EST/EDT.\n\n> ⚠️ **DST edge:** wall-clock times that don't exist on a spring-forward day (e.g. 2AM) are **skipped**; times that occur twice on a fall-back day **fire twice**. Schedule outside the 1–3AM local window, or use UTC, when missed or duplicate executions are unacceptable.\n\n## Deployment runs\n\nEvery trigger attempt — successful or not — writes a **deployment run** record (`drun_` prefix), so you can audit failures independent of the session lifecycle. A successful run carries the created `session_id`; follow that session via the event stream (`shared/managed-agents-events.md`) or webhooks (`shared/managed-agents-webhooks.md`) as usual. A failed run carries an `error` whose `type` explains why session creation was rejected.\n\n```python\n# All runs for a deployment\nfor run in client.beta.deployment_runs.list(deployment_id=deployment.id):\n    print(run.created_at, run.session_id or run.error.type)\n\n# Failures only\nfor run in client.beta.deployment_runs.list(deployment_id=deployment.id, has_error=True):\n    print(run.created_at, run.error.type, run.error.message)\n```\n\n```typescript\nfor await (const run of client.beta.deploymentRuns.list({\n  deployment_id: deployment.id,\n  has_error: true,\n})) {\n  console.log(run.created_at, run.error?.type, run.error?.message);\n}\n```\n\nRaw HTTP: `GET /v1/deployment_runs?deployment_id=...&has_error=true`. To retrieve a single run by ID, `GET /v1/deployment_runs/{deployment_run_id}` (SDK: `client.beta.deployment_runs.retrieve(run_id)`) — a `deployment_run.*` webhook event carries the run ID as its `data.id`.\n\nA failed run looks like:\n\n```json\n{\n  \"type\": \"deployment_run\",\n  \"id\": \"drun_01abc124\",\n  \"deployment_id\": \"depl_01xyz\",\n  \"trigger_context\": { \"type\": \"schedule\", \"scheduled_at\": \"2026-05-09T00:00:00Z\" },\n  \"session_id\": null,\n  \"error\": { \"type\": \"environment_archived\", \"message\": \"environment `env_01abc` is archived\" },\n  \"agent\": { \"type\": \"agent\", \"id\": \"agent_01ghi789\", \"version\": 3 },\n  \"created_at\": \"2026-05-09T00:00:01Z\"\n}\n```\n\nError types include `environment_archived`, `agent_archived`, `vault_not_found`, `session_rate_limited`, and `service_unavailable`.\n\nThe outcome of each **scheduled** run (started/succeeded/failed) and each deployment lifecycle change (created/updated/paused/unpaused/archived/deleted) is also delivered as a webhook event — see `shared/managed-agents-webhooks.md` for the `deployment.*` and `deployment_run.*` event types — so you can react without polling. Manual runs do **not** emit `deployment_run.*` webhook events.\n\n## Lifecycle: pause / unpause / archive\n\n| Operation | SDK | Effect |\n|---|---|---|\n| Pause | `client.beta.deployments.pause(id)` | Suppresses scheduled triggers go-forward. Sessions already running continue. **Manual runs are still permitted while paused.** Sets `paused_reason: {\"type\": \"manual\"}`. |\n| Unpause | `client.beta.deployments.unpause(id)` | Resumes from the next scheduled occurrence. **Missed triggers are not backfilled.** Clears `paused_reason`. |\n| Archive | `client.beta.deployments.archive(id)` | **Terminal** — the schedule stops and the deployment can no longer be modified. Use pause for anything reversible. |\n\nRaw HTTP: `POST /v1/deployments/{deployment_id}/pause` (likewise `/unpause`, `/archive`).\n\n### Failure behavior\n\n- **Rate-limited:** recorded immediately as a `session_rate_limited` run, **no retry** — the schedule simply tries again at the next occurrence. (Rate limits on API calls *inside* a session are handled by the session itself.)\n- **Other failed runs** (e.g. `environment_archived`, `vault_not_found`, `service_unavailable`): the run records the `error.type` — monitor runs and fix the referenced resource, or pause the deployment.\n- **Agent archived or deleted:** the deployment is automatically **archived** (terminal) and no further sessions are created.\n\n## Manual runs\n\n`POST /v1/deployments/{deployment_id}/run` (SDK: `client.beta.deployments.run(id)`) creates a session immediately and writes a run with `trigger_context.type: \"manual\"`. Use it to **test a deployment before committing to the schedule** — and remember it works even while the deployment is paused.\n</doc>\n\n<doc path=\"shared/managed-agents-self-hosted-sandboxes.md\">\n# Managed Agents — Self-Hosted Sandboxes\n\nWith `config.type: \"self_hosted\"`, the **agent loop stays on Anthropic's orchestration layer** but **tool execution moves to infrastructure you control** — bash, file ops, and code run inside your container, so filesystem contents and network egress never leave your environment. Contrast with `config.type: \"cloud\"`, where Anthropic runs the container. Connectivity is **outbound-only**: your worker long-polls Anthropic's work queue; Anthropic never dials into your network.\n\n## Flow\n\n```\n1. Create environment:      config: {type: \"self_hosted\"}        → env_...\n2. Generate environment key (Console, on the environment page)   → sk-ant-oat01-...  as ANTHROPIC_ENVIRONMENT_KEY\n3. Run a worker:            EnvironmentWorker.run()  or  ant beta:worker poll\n4. Sessions reference       environment_id=env_... exactly as for cloud\n```\n\n## Create the environment\n\n```python\nclient = anthropic.Anthropic()\n\nenvironment = client.beta.environments.create(\n    name=\"self-hosted\", config={\"type\": \"self_hosted\"}\n)\n```\n\n`{\"type\": \"self_hosted\"}` is the entire config — there are no pool, capacity, or networking sub-fields; you control those on your side.\n\n## Run a worker — SDK (primary path)\n\n`EnvironmentWorker` wraps the poll → dispatch → tool-execute loop. `.run()` is the always-on loop; `.run_one()` / `.runOne()` handles one work item (for webhook-driven wake).\n\n**Python — always-on:**\n\n```python\nimport asyncio\nimport os\nfrom anthropic import AsyncAnthropic\nfrom anthropic.lib.environments import EnvironmentWorker\n\n\nasync def main() -> None:\n    environment_key = os.environ[\"ANTHROPIC_ENVIRONMENT_KEY\"]\n    environment_id = os.environ[\"ANTHROPIC_ENVIRONMENT_ID\"]\n    async with AsyncAnthropic(auth_token=environment_key) as client:\n        await EnvironmentWorker(\n            client,\n            environment_id=environment_id,\n            environment_key=environment_key,\n            workdir=\"/workspace\",\n        ).run()\n\n\nasyncio.run(main())\n```\n\n**TypeScript — always-on:**\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\nimport { EnvironmentWorker } from \"@anthropic-ai/sdk/helpers/beta/environments\";\n\nconst environmentKey = process.env.ANTHROPIC_ENVIRONMENT_KEY!;\nconst environmentId = process.env.ANTHROPIC_ENVIRONMENT_ID!;\nconst client = new Anthropic({ authToken: environmentKey });\nconst ctrl = new AbortController();\nprocess.once(\"SIGTERM\", () => ctrl.abort());\n\nawait new EnvironmentWorker({\n  client,\n  environmentId,\n  environmentKey,\n  workdir: \"/workspace\",\n  signal: ctrl.signal\n}).run();\n```\n\n**Customizing tools.** `EnvironmentWorker` runs the built-in toolset by default. To add or replace tools, use `AgentToolContext(workdir=, client=, session_id=)` with `beta_agent_toolset(env)` / `betaAgentToolset(env)` and pass the resulting tools to the lower-level `tool_runner()`. Skills attached to the agent are downloaded into `{workdir}/skills/<name>/` before tool calls begin (`AgentToolContext` handles this when given `client` and `session_id`). Downloaded skill files are marked executable automatically by the CLI and SDK; if you implement skills download yourself, you set permissions.\n\n> **Runtime deps:** the SDK helpers require `/bin/bash` at that exact path. The TypeScript SDK additionally requires `unzip`, `tar`, and Node.js 22+. These are resolved at fixed paths and do **not** respect `PATH` overrides.\n\n## Run a worker — `ant` CLI (fixed tools)\n\nThe `ant` CLI ships a worker with the fixed built-in toolset (`bash`, `read`, `write`, `edit`, `glob`, `grep`). Install per `shared/anthropic-cli.md`, then:\n\n```sh\nexport ANTHROPIC_ENVIRONMENT_KEY=sk-ant-oat01-...\nant beta:worker poll --environment-id env_... --workdir /workspace\n```\n\n- `--workdir` is the directory tools operate in (default `.`); tool calls are sandboxed to it.\n- `--environment-key` overrides the env var.\n- `--on-work <script>` runs your script per work item (e.g. to spin a fresh container per session — see Container orchestration below).\n- `--unrestricted-paths`, `--max-idle` (default `60s`), `--log-format` — see `ant beta:worker poll --help`.\n- Flags fall back to env vars (`ANTHROPIC_ENVIRONMENT_ID`, `ANTHROPIC_ENVIRONMENT_KEY`).\n- Exits cleanly on SIGTERM/SIGINT after draining in-flight work.\n- **Fixed toolset** — for custom tools, use the SDK worker above.\n\nInside an `--on-work` container, run `ant beta:worker run --workdir <dir>` as the entrypoint.\n\n## Webhook-driven wake (instead of always-on)\n\nRegister a webhook for `session.status_run_started` (see `shared/managed-agents-webhooks.md`), verify the delivery, then drain one work item with `.run_one()`:\n\n```python\nimport os\nimport anthropic\nfrom anthropic.lib.environments import EnvironmentWorker\n\nenvironment_key = os.environ[\"ANTHROPIC_ENVIRONMENT_KEY\"]\nenvironment_id = os.environ[\"ANTHROPIC_ENVIRONMENT_ID\"]\nclient = anthropic.AsyncAnthropic(\n    auth_token=environment_key,\n)  # reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env for webhooks.unwrap()\n\n\nasync def handle(raw: bytes, headers: dict[str, str]) -> dict:\n    event = client.beta.webhooks.unwrap(raw.decode(), headers=headers)\n    if event.data.type != \"session.status_run_started\":\n        return {\"status\": \"ignored\"}\n    await EnvironmentWorker(\n        client,\n        environment_id=environment_id,\n        environment_key=environment_key,\n        workdir=\"/workspace\",\n    ).run_one()\n    return {\"status\": \"ok\"}\n```\n\nTypeScript: same shape with `client.beta.webhooks.unwrap(body, {headers})` and `new EnvironmentWorker({...}).runOne()`.\n\n## Container orchestration (mid-level)\n\n`EnvironmentWorker.run()` polls and executes tools in the same process. To run each session in its **own** container, use the mid-level poller in a thin orchestrator — Python `client.beta.environments.work.poller(environment_id=, environment_key=, drain=, block_ms=, reclaim_older_than_ms=, auto_stop=)`; TypeScript `new WorkPoller({client, environmentId, environmentKey, autoStop})` from `@anthropic-ai/sdk/helpers/beta/environments` — and, for each yielded `work` item, start a fresh container with these env vars injected, whose entrypoint runs `ant beta:worker run` or an `EnvironmentWorker(...).run_one()`. `block_ms` is 1–999 (or `None` for non-blocking); `reclaim_older_than_ms` re-claims items leased to a dead worker; `drain` stops once the queue is empty; `auto_stop` posts a stop signal after the iterator exits (set `False` when the launched container owns the stop call). **Go's poller has no `auto_stop` opt-out** — it calls `work.Stop` when the handler returns, so block in the handler until the session completes rather than detaching.\n\n| Env var | Value |\n|---|---|\n| `ANTHROPIC_SESSION_ID` | `work.data.id` |\n| `ANTHROPIC_WORK_ID` | `work.id` |\n| `ANTHROPIC_ENVIRONMENT_ID` | `work.environment_id` |\n| `ANTHROPIC_ENVIRONMENT_KEY` | pass through |\n| `ANTHROPIC_BASE_URL` | pass through |\n\nSkip items where `work.data.type != \"session\"`.\n\n## Monitoring & control\n\nThese are **control-plane** calls — authenticate with `x-api-key` (not the environment key); `managed-agents-2026-04-01` beta header. **Call them from outside the worker host** — setting `ANTHROPIC_API_KEY` on the worker host exposes an organization-scoped credential to agent tool calls.\n\n| SDK (`client.beta.environments.work.*`) | REST | CLI | Returns |\n|---|---|---|---|\n| `stats(environment_id)` | `GET /v1/environments/{id}/work/stats` | `ant beta:environments:work stats` | `{type:\"work_queue_stats\", depth, pending, oldest_queued_at, workers_polling}` |\n| `stop(work_id, environment_id=)` | `POST /v1/environments/{id}/work/{work_id}/stop` | `ant beta:environments:work stop` | `work.state` |\n\n## What changes vs `cloud`\n\n| Concern | `cloud` | `self_hosted` |\n|---|---|---|\n| Container lifecycle, hardening, networking | Anthropic | **You** — run non-root, read-only rootfs, drop caps; egress is whatever your VPC/firewall allows |\n| `file` / `github_repository` resource mounting | Anthropic mounts into the container | **You** — pass pointers via `sessions.create(metadata={...})` and have your orchestrator fetch/clone before dispatch |\n| `memory_store` resources | Supported | **Not yet supported** |\n| Vault `environment_variable` credentials | Supported (substituted at Anthropic-managed egress) | **Not yet supported** — egress is yours, so there's nowhere to substitute the secret. Use MCP credentials or a host-side custom tool (`shared/managed-agents-client-patterns.md` Pattern 9) |\n| Built-in tools | Via `agent_toolset_20260401` | Supplied by your worker (`EnvironmentWorker` default / `beta_agent_toolset(env)` / `ant` CLI fixed set) |\n| Skills download | Automatic | `EnvironmentWorker` / `AgentToolContext` fetch into `{workdir}/skills/` (needs `client` + `session_id`) |\n| Claude Platform on AWS | Supported | **Not available** |\n| SDK worker helpers | All SDKs | **Python, TypeScript, Go only** (`EnvironmentWorker` / poller not in Java, Ruby, PHP, or C#) — use one of those three or the `ant` CLI |\n\n## Credentials\n\n| Credential | Format | Scope |\n|---|---|---|\n| `ANTHROPIC_ENVIRONMENT_KEY` | `sk-ant-oat01-...` | One environment's work queue. Generate in Console (\"Generate environment key\"). Pass as `auth_token=` / `authToken` on the client **and** as `environment_key=` / `environmentKey` on `EnvironmentWorker`. Store in a secrets manager; rotate on exposure. |\n| `ANTHROPIC_WEBHOOK_SIGNING_KEY` | `whsec_...` | Webhook signature verification (if using webhook-driven wake). The SDK reads this env var automatically for `client.beta.webhooks.unwrap()`. |\n\n## Security — what you own\n\nContainer hardening; egress restriction (there is no default); `ANTHROPIC_ENVIRONMENT_KEY` custody and rotation; one workspace + environment per trust boundary when running untrusted code; least-privilege for the tool process; log retention and redaction. **Anthropic cannot**: fast-revoke a leaked environment key, verify your image or supply chain, sandbox tool execution inside your container, or enforce retention after tool output reaches your infrastructure. See the Self-Hosted Sandboxes Security page in `shared/live-sources.md` for the full checklist.\n</doc>\n\n<doc path=\"shared/managed-agents-tools.md\">\n# Managed Agents — Tools & Skills\n\n## Tools\n\n### Server tools vs client tools\n\n| Type | Who runs it | How it works |\n|---|---|---|\n| **Prebuilt Claude Agent tools** (`agent_toolset_20260401`) | Anthropic, on the session's container (for `cloud` envs; for `self_hosted`, **your** worker supplies and runs them — see `shared/managed-agents-self-hosted-sandboxes.md`) | File ops, bash, web search, etc. Enable all at once or configure individually with `enabled: true/false`. |\n| **MCP tools** (`mcp_toolset`) | Anthropic's orchestration layer | Capabilities exposed by connected MCP servers. Grant access per-server via the toolset. |\n| **Custom tools** | **You** — your application handles the call and returns results | Agent emits a `agent.custom_tool_use` event, session goes `idle`, you send back a `user.custom_tool_result` event. |\n\n**Recommendation:** Enable all prebuilt tools via `agent_toolset_20260401`, then disable individually as needed.\n\n**Versioning:** The toolset is a versioned, static resource. When underlying tools change, a new toolset version is created (hence `_20260401`) so you always know exactly what you're getting.\n\n### Agent Toolset\n\nThe `agent_toolset_20260401` provides these built-in tools:\n\n| Tool                   | Description                              |\n| ---------------------- | ---------------------------------------- |\n| `bash` | Execute bash commands in a shell session |\n| `read` | Read a file from the local filesystem, including text, images, PDFs, and Jupyter notebooks |\n| `write` | Write a file to the local filesystem |\n| `edit` | Perform string replacement in a file |\n| `glob` | Fast file pattern matching using glob patterns |\n| `grep` | Text search using regex patterns |\n| `web_fetch` | Fetch content from a URL |\n| `web_search` | Search the web for information |\n\nEnable the full toolset:\n\n```json\n{\n  \"tools\": [\n    { \"type\": \"agent_toolset_20260401\" }\n  ]\n}\n```\n\n### Per-Tool Configuration\n\nOverride defaults for individual tools. This example enables everything except bash:\n\n```json\n{\n  \"tools\": [\n    {\n      \"type\": \"agent_toolset_20260401\",\n      \"default_config\": { \"enabled\": true },\n      \"configs\": [\n        { \"name\": \"bash\", \"enabled\": false }\n      ]\n    }\n  ]\n}\n```\n\n| Field | Required | Description |\n|---|---|---|\n| `type` | ✅ | `\"agent_toolset_20260401\"` |\n| `default_config` | ❌ | Applied to all tools. `{ \"enabled\": bool, \"permission_policy\": {...} }` |\n| `configs` | ❌ | Per-tool overrides: `[{ \"name\": \"...\", \"enabled\": bool, \"permission_policy\": {...} }]` |\n\n### Permission Policies\n\nControl when server-executed tools (agent toolset + MCP) run automatically vs wait for approval. Does not apply to custom tools.\n\n| Policy | Behavior |\n|---|---|\n| `always_allow` | Tool executes automatically (default) |\n| `always_ask` | Session emits `session.status_idle` and pauses until you send a `tool_confirmation` event |\n\n```json\n{\n  \"type\": \"agent_toolset_20260401\",\n  \"default_config\": {\n    \"enabled\": true,\n    \"permission_policy\": { \"type\": \"always_allow\" }\n  },\n  \"configs\": [\n    { \"name\": \"bash\", \"permission_policy\": { \"type\": \"always_ask\" } }\n  ]\n}\n```\n\n**Responding to `always_ask`:** Send a `user.tool_confirmation` event with `tool_use_id` from the triggering `agent_tool_use`/`mcp_tool_use` event:\n\n```json\n{ \"type\": \"tool_confirmation\", \"tool_use_id\": \"sevt_abc123\", \"result\": \"allow\" }\n{ \"type\": \"tool_confirmation\", \"tool_use_id\": \"sevt_def456\", \"result\": \"deny\", \"message\": \"Read .env.example instead\" }\n```\n\nThe optional `message` on a deny is delivered to the agent so it can adjust its approach.\n\nTo enable only specific tools, flip the default off and opt-in per tool:\n\n```json\n{\n  \"tools\": [\n    {\n      \"type\": \"agent_toolset_20260401\",\n      \"default_config\": { \"enabled\": false },\n      \"configs\": [\n        { \"name\": \"bash\", \"enabled\": true },\n        { \"name\": \"read\", \"enabled\": true }\n      ]\n    }\n  ]\n}\n```\n\n### Custom Tools (Client-Side)\n\nCustom tools are executed by **your application**, not Anthropic. The flow:\n\n1. Agent decides to use the tool → session emits a `agent.custom_tool_use` event with inputs\n2. Session goes `idle` waiting for you\n3. Your application executes the tool\n4. You send back a `user.custom_tool_result` event with the output\n5. Session resumes `running`\n\nNo permission policy needed — you're the one executing.\n\n```json\n{\n  \"tools\": [\n    {\n      \"type\": \"custom\",\n      \"name\": \"get_weather\",\n      \"description\": \"Fetch current weather for a city.\",\n      \"input_schema\": {\n        \"type\": \"object\",\n        \"properties\": {\n          \"city\": { \"type\": \"string\", \"description\": \"City name\" }\n        },\n        \"required\": [\"city\"]\n      }\n    }\n  ]\n}\n```\n\n### MCP Servers\n\nMCP (Model Context Protocol) servers expose standardized third-party capabilities (e.g. Asana, GitHub, Linear). **Configuration is split across agent and vault:**\n\n1. **Agent creation** declares which servers to connect to (`type`, `name`, `url` — no auth). The agent's `mcp_servers` array has no auth field.\n2. **Vault** stores the OAuth credentials. Attach via `vault_ids` on session create.\n\nThis keeps secrets out of reusable agent definitions. Each vault credential is tied to one MCP server URL; Anthropic matches credentials to servers by URL.\n\n**Agent side — declare servers (no auth):**\n\n| Field | Required | Description |\n|---|---|---|\n| `type` | ✅ | `\"url\"` |\n| `name` | ✅ | Unique name — referenced by `mcp_toolset.mcp_server_name` |\n| `url` | ✅ | The MCP server's endpoint URL (Streamable HTTP transport) |\n\n```json\n{\n  \"mcp_servers\": [\n    { \"type\": \"url\", \"name\": \"linear\", \"url\": \"https://mcp.linear.app/mcp\" }\n  ],\n  \"tools\": [\n    { \"type\": \"mcp_toolset\", \"mcp_server_name\": \"linear\" }\n  ]\n}\n```\n\n**Session side — attach vault:**\n\n```json\n{\n  \"agent\": \"agent_abc123\",\n  \"environment_id\": \"env_abc123\",\n  \"vault_ids\": [\"vlt_abc123\"]\n}\n```\n\n> 💡 **Per-tool enablement (empirical):** `mcp_toolset` has been observed accepting `default_config: {enabled: false}` + `configs: [{name, enabled: true}]` for an allowlist pattern. The API ref shows only the minimal `{type, mcp_server_name}` form.\n\n> 💡 **Changing tools/MCP servers on a running session:** `sessions.update()` can replace `agent.tools`, `agent.mcp_servers`, and `vault_ids` while the session is `idle` — a session-local override that doesn't touch the agent object. See `shared/managed-agents-core.md` → Updating the agent configuration mid-session.\n\n**Large MCP tool outputs.** If an MCP tool returns more than **100K tokens**, the output is automatically offloaded to a file in the sandbox — the agent receives a truncated preview plus the file path and can `read` the full content. No configuration required.\n\n**Invalid vault credentials don't block session creation.** If a vault credential is invalid for a declared MCP server, the session still creates successfully; a `session.error` event describes the MCP auth failure, and auth retries on the next `session.status_idle` → `session.status_running` transition.\n\n> ⚠️ **MCP auth tokens ≠ REST API tokens.** Hosted MCP servers (`mcp.notion.com`, `mcp.linear.app`, etc.) typically require **OAuth bearer tokens**, not the service's native API keys. A Notion `ntn_` integration token authenticates against Notion's REST API but will **not** work as a vault credential for the Notion MCP server. These are different auth systems.\n\n### Vaults — the credential store\n\n**Vaults** store credentials that Anthropic manages on your behalf. Two credential categories:\n\n- **MCP credentials** (`mcp_oauth`, `static_bearer`) — keyed by `mcp_server_url`. When the agent connects to a server at that URL, the token is injected automatically. `mcp_oauth` tokens are auto-refreshed via the standard OAuth 2.0 `refresh_token` grant. This is the only way to authenticate MCP servers.\n- **Environment variables** (`environment_variable`) — keyed by `secret_name` (the env var name). The sandbox sees only an **opaque placeholder**; the real secret is substituted into the outbound request **at egress**. Use this for any service that authenticates through an environment variable: CLIs (`aws`, `gcloud`, `stripe`), SDKs, or direct `curl` calls from the `bash` tool.\n\nSecret fields you supply (`token`, `access_token`, `refresh_token`, `client_secret`, `secret_value`) are write-only — never returned in API responses.\n\n#### Credentials and the sandbox\n\nVaults store credentials; those credentials **never enter the sandbox**. This is a deliberate security boundary — code running in the sandbox (including anything the agent writes) cannot read or exfiltrate a vaulted credential, even under prompt injection. Instead, credentials are injected by Anthropic-side proxies **after** a request leaves the sandbox:\n\n- **MCP tool calls** are routed through an Anthropic-side proxy that fetches the credential from the vault and adds it to the outbound request.\n- **Git operations on attached GitHub repositories** (`git pull`, `git push`, GitHub REST calls) are routed through a git proxy that injects the `github_repository` resource's `authorization_token` the same way.\n- **Environment-variable credentials** appear in the sandbox as an opaque placeholder; the real value replaces the placeholder at egress, on requests to the credential's allowed hosts only.\n\n**When vault credentials don't fit** (e.g. self-hosted sandboxes — `environment_variable` is not yet supported there), **register a custom tool:** the agent emits `agent.custom_tool_use`, your orchestrator (which already holds the credential) executes the call and returns `user.custom_tool_result` over the same authenticated event stream. No public endpoint is exposed; the sandbox never sees the secret. See `shared/managed-agents-client-patterns.md` → Pattern 9.\n\n**Do not put API keys in the system prompt or user messages as a workaround** — they persist in the session's event history.\n\n> Formerly known internally as TATs (Tool/Tenant Access Tokens).\n\n**Flow:**\n\n1. Create a vault (`client.beta.vaults.create(...)`) — one per tenant/user, or one shared, depending on your model\n2. Add credentials to it (`client.beta.vaults.credentials.create(...)`) — MCP credentials are keyed by MCP server URL; environment-variable credentials by `secret_name`\n3. Reference the vault on session create via `vault_ids: [\"vlt_...\"]`\n4. Anthropic auto-refreshes OAuth tokens before they expire and substitutes secrets at runtime\n\n**MCP OAuth credential shape**:\n\n```json\n{\n  \"display_name\": \"Notion (workspace-foo)\",\n  \"auth\": {\n    \"type\": \"mcp_oauth\",\n    \"mcp_server_url\": \"https://mcp.notion.com/mcp\",\n    \"access_token\": \"<current access token>\",\n    \"expires_at\": \"2026-04-02T14:00:00Z\",\n    \"refresh\": {\n      \"refresh_token\": \"<refresh token>\",\n      \"client_id\": \"<your OAuth client_id>\",\n      \"token_endpoint\": \"https://api.notion.com/v1/oauth/token\",\n      \"token_endpoint_auth\": { \"type\": \"none\" }\n    }\n  }\n}\n```\n\nThe `refresh` block is what enables auto-refresh — `token_endpoint` is where Anthropic posts the `refresh_token` grant. `token_endpoint_auth` is a discriminated union:\n\n| `type` | Shape | Use when |\n|---|---|---|\n| `\"none\"` | `{type: \"none\"}` | Public OAuth client (no secret) |\n| `\"client_secret_basic\"` | `{type: \"client_secret_basic\", client_secret: \"...\"}` | Confidential client, secret via HTTP Basic auth |\n| `\"client_secret_post\"` | `{type: \"client_secret_post\", client_secret: \"...\"}` | Confidential client, secret in request body |\n\nOmit `refresh` entirely if you only have an access token with no refresh capability — it'll work until it expires, then the agent loses access.\n\n> 💡 **Getting an OAuth token.** How you obtain the initial access and refresh tokens depends on the MCP server — consult its documentation. Once you have them, store them in a vault credential using the shape above; Anthropic auto-refreshes via the `refresh.token_endpoint` from there.\n\n**Environment-variable credential shape**:\n\n```json\n{\n  \"display_name\": \"Twilio API key for sandbox\",\n  \"auth\": {\n    \"type\": \"environment_variable\",\n    \"secret_name\": \"TWILIO_API_KEY\",\n    \"secret_value\": \"sk-your-secret-here\",\n    \"networking\": {\n      \"type\": \"limited\",\n      \"allowed_hosts\": [\"api.twilio.com\", \"*.twilio.com\"]\n    }\n  }\n}\n```\n\n`networking.allowed_hosts` controls which outbound hosts the secret can be substituted for — `{\"type\": \"limited\", \"allowed_hosts\": [...]}` or `{\"type\": \"unrestricted\"}` if you can't enumerate the domains in advance. Limiting is strongly recommended: it prevents the key from ever being sent to unauthorized hosts.\n\n**`injection_location`** (optional, sibling of `networking`) controls **where** in the outbound request the secret is substituted — `{header: bool, body: bool}`. The two are independent: `allowed_hosts` scopes *which hosts* a substituted request can target; `injection_location` scopes *which parts of the request* the secret is substituted into across all of those hosts. Most services read an API key from a request header, so `{\"header\": true}` is the narrower configuration — request bodies are often assembled from content the agent is working with, making the body the broader exposure surface. A placeholder in a disabled location is **neither substituted nor stripped** — the literal opaque placeholder string is sent to the third party in that location.\n\n| Operation | `injection_location` semantics |\n|---|---|\n| Create credential | Omit the field entirely → both locations enabled. Provide the object → any field you omit defaults to `false` (`{\"header\": true}` creates a header-only credential). |\n| Update credential | Fields **merge individually** — `{\"body\": false}` disables body substitution and leaves `header` unchanged. For a running session, the update takes effect on the session's next operation. |\n\nA credential must have at least one location enabled; a create or update that would disable both returns 400, as does explicit `null` for the object or either field (omit instead). The response always returns both fields with their resolved values.\n\n> ⚠️ **Two networking layers, both required.** `networking.allowed_hosts` on the credential controls which requests *use the secret*, not which requests are *allowed*. The agent must also be able to reach the domain at the **environment level** (`unrestricted`, or the host listed in the environment's `allowed_hosts` — see `shared/managed-agents-environments.md`). A domain missing from either layer means the secret-substituted request fails.\n\n> ⚠️ **Client-side validation caveat.** Substitution happens at egress, not inside the sandbox — clients that validate the credential *format* locally before making a network request (e.g. a CLI that checks the key starts with `sk-`) will see the opaque placeholder and may fail at startup. If a client rejects the credential before any network call, that's why.\n\n> 💡 **Scope the key minimally.** The agent can do anything the key allows; a key with broader permissions than the task needs increases the blast radius if the agent behaves unexpectedly.\n\n**Not supported with self-hosted sandboxes** — `environment_variable` credentials require Anthropic-managed egress. See `shared/managed-agents-self-hosted-sandboxes.md`.\n\n**Constraints (all credential types):**\n\n- **Unique key per vault.** `mcp_server_url` (MCP credentials) and `secret_name` (environment-variable credentials) must be unique among active credentials in a vault; duplicates return a 409.\n- **Keys are immutable.** Secret values, `display_name`, and (on environment-variable credentials) `injection_location` can be updated; to change `mcp_server_url`, `secret_name`, `token_endpoint`, or `client_id`, archive the credential and create a new one. Archiving purges the secret and frees the key for a replacement.\n- **Maximum 20 credentials per vault.**\n- Credentials are stored as provided and **not validated until session runtime** — an invalid credential surfaces as an authentication or downstream error during the session, which is emitted but does not block the session from continuing.\n\n**Scoping:** Vaults are workspace-scoped. Anyone with developer+ role in the API workspace can create, read (metadata only — secrets are write-only), and attach vaults. `vault_ids` can be set at session **create** time but not via session update (the SDK docstring says \"Not yet supported; requests setting this field are rejected\").\n\n---\n\n## Skills\n\nSkills are reusable, filesystem-based resources that provide your agent with domain-specific expertise: workflows, context, and best practices that transform general-purpose agents into specialists. Unlike prompts (conversation-level instructions for one-off tasks), skills load on-demand and eliminate the need to repeatedly provide the same guidance across multiple conversations.\n\nTwo types — both work the same way; the agent automatically uses them when relevant to the task at hand:\n\n| Type | What it is |\n|---|---|\n| **Pre-built Anthropic skills** | Common document tasks (PowerPoint, Excel, Word, PDF). Reference by name (e.g. `xlsx`). |\n| **Custom skills** | Skills you've created in your organization via the Skills API. Reference by `skill_id` + optional `version`. |\n\n**Max 20 skills per agent.** Agent creation uses `managed-agents-2026-04-01`; the separate Skills API (for managing custom skill definitions) uses `skills-2025-10-02`.\n\n### Enabling skills on a session\n\nSkills are attached to the **agent** definition via `agents.create()`:\n\n```ts\nconst agent = await client.beta.agents.create(\n  {\n    name: \"Financial Agent\",\n    model: \"claude-opus-4-8\",\n    system: \"You are a financial analysis agent.\",\n    skills: [\n      { type: \"anthropic\", skill_id: \"xlsx\" },\n      { type: \"custom\", skill_id: \"skill_abc123\", version: \"latest\" },\n    ],\n  }\n);\n```\n\nPython:\n\n```python\nagent = client.beta.agents.create(\n    name=\"Financial Agent\",\n    model=\"claude-opus-4-8\",\n    system=\"You are a financial analysis agent.\",\n    skills=[\n        {\"type\": \"anthropic\", \"skill_id\": \"xlsx\"},\n        {\"type\": \"custom\", \"skill_id\": \"skill_abc123\", \"version\": \"latest\"},\n    ]\n)\n```\n\n**Skill reference fields:**\n\n| Field | Anthropic skill | Custom skill |\n|---|---|---|\n| `type` | `\"anthropic\"` | `\"custom\"` |\n| `skill_id` | Skill name (e.g. `\"xlsx\"`, `\"docx\"`, `\"pptx\"`, `\"pdf\"`) | Skill ID from Skills API (e.g. `\"skill_abc123\"`) |\n| `version` | — | `\"latest\"` or a specific version number |\n\n### Skills API\n\n| Operation             | Method   | Path                                            |\n| --------------------- | -------- | ----------------------------------------------- |\n| Create Skill          | `POST`   | `/v1/skills`                                    |\n| List Skills           | `GET`    | `/v1/skills`                                    |\n| Get Skill             | `GET`    | `/v1/skills/{id}`                               |\n| Delete Skill          | `DELETE` | `/v1/skills/{id}`                               |\n| Create Version        | `POST`   | `/v1/skills/{id}/versions`                      |\n| List Versions         | `GET`    | `/v1/skills/{id}/versions`                      |\n| Get Version           | `GET`    | `/v1/skills/{id}/versions/{version}`            |\n| Delete Version        | `DELETE` | `/v1/skills/{id}/versions/{version}`            |\n</doc>\n\n<doc path=\"shared/managed-agents-webhooks.md\">\n# Managed Agents — Webhooks\n\nAnthropic can POST to your HTTPS endpoint when a Managed Agents resource changes state — an alternative to holding an SSE stream or polling. Payloads are **thin** (event type + resource IDs only); on receipt, fetch the resource for current state. Every delivery is HMAC-signed.\n\n> **Direction matters.** This page covers *Anthropic → you* notifications about session/vault state. It does **not** cover *third-party → you* webhooks that *trigger* a session (e.g. a GitHub push handler that calls `sessions.create()`) — that's ordinary application code on your side with no Anthropic-specific wire format.\n\n---\n\n## Register an endpoint (Console only)\n\nConsole → **Manage → Webhooks**. There is no programmatic endpoint-management API yet. Secret rotation is supported from the same page.\n\n| Field | Constraint |\n|---|---|\n| URL | HTTPS on port 443, publicly resolvable hostname |\n| Event types | Subscribe per `data.type` — you only receive subscribed types (plus test events) |\n| Signing secret | `whsec_`-prefixed, 32 bytes, **shown once at creation** — store it |\n\n---\n\n## Verify the signature\n\nEvery delivery is HMAC-signed. **Use the SDK's `client.beta.webhooks.unwrap()`** — it verifies the signature, rejects payloads more than ~5 minutes old, and returns the parsed event. It reads the `whsec_` secret from `ANTHROPIC_WEBHOOK_SIGNING_KEY`.\n\n```python\nimport anthropic\nfrom flask import Flask, request\n\nclient = anthropic.Anthropic()  # reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env\napp = Flask(__name__)\n\n\n@app.route(\"/webhook\", methods=[\"POST\"])\ndef webhook():\n    try:\n        event = client.beta.webhooks.unwrap(\n            request.get_data(as_text=True),\n            headers=dict(request.headers),\n        )\n    except Exception:\n        return \"invalid signature\", 400\n\n    if event.id in seen_event_ids:  # dedupe retries — id is per-event, not per-delivery\n        return \"\", 204\n    seen_event_ids.add(event.id)\n\n    match event.data.type:\n        case \"session.status_idled\":\n            session = client.beta.sessions.retrieve(event.data.id)\n            notify_user(session)\n        case \"vault_credential.refresh_failed\":\n            alert_oncall(event.data.id)\n\n    return \"\", 204\n```\n\nPass the **raw request body** to `unwrap()` — frameworks that re-serialize JSON (Express `.json()`, Flask `.get_json()`) change the bytes and break the MAC. For other languages, look up the `beta.webhooks.unwrap` binding in the SDK repo (`shared/live-sources.md`); don't hand-roll verification.\n\n---\n\n## Payload envelope\n\n```json\n{\n  \"type\": \"event\",\n  \"id\": \"event_01ABC...\",\n  \"created_at\": \"2026-03-18T14:05:22Z\",\n  \"data\": {\n    \"type\": \"session.status_idled\",\n    \"id\": \"session_01XYZ...\",\n    \"organization_id\": \"8a3d2f1e-...\",\n    \"workspace_id\": \"c7b0e4d9-...\"\n  }\n}\n```\n\nSwitch on `data.type`, fetch the resource by `data.id`, return any **2xx** to acknowledge. `created_at` is when the *state transition* happened, not when the webhook fired.\n\n---\n\n## Supported `data.type` values\n\n| `data.type` | Fires when |\n|---|---|\n| `session.status_scheduled` | Session created and ready to accept events |\n| `session.status_run_started` | Agent execution kicked off (every transition to `running`) |\n| `session.status_idled` | Agent awaiting input (tool approval, custom tool result, or next message) |\n| `session.status_terminated` | Session hit a terminal error |\n| `session.thread_created` | Multiagent: coordinator opened a new subagent thread |\n| `session.thread_idled` | Multiagent: a subagent thread is waiting for input |\n| `session.outcome_evaluation_ended` | Outcome grader finished one iteration |\n| `vault.archived` | Vault was archived |\n| `vault.created` | Vault was created |\n| `vault.deleted` | Vault was deleted |\n| `vault_credential.archived` | Vault credential was archived |\n| `vault_credential.created` | Vault credential was created |\n| `vault_credential.deleted` | Vault credential was deleted |\n| `vault_credential.refresh_failed` | MCP OAuth vault credential failed to refresh |\n| `agent.created` | Agent created |\n| `agent.updated` | A new agent version was published. Updates that do not create a new version do **not** fire this. |\n| `agent.archived` | Agent archived |\n| `agent.deleted` | Agent permanently deleted — no object left to fetch; treat the event itself as final |\n| `deployment.created` | Scheduled deployment created |\n| `deployment.updated` | Deployment properties changed (e.g. schedule edited) |\n| `deployment.paused` | Deployment paused — by request, or automatically when a scheduled run fails with a **non-recoverable** error (archived agent, missing environment). Recoverable failures, including rate limits, do **not** auto-pause. |\n| `deployment.unpaused` | Deployment unpaused; schedule resumes |\n| `deployment.archived` | Deployment archived — directly, or as a result of agent archival/deletion |\n| `deployment.deleted` | Deployment permanently deleted — no object left to fetch; treat the event itself as final |\n| `deployment_run.started` | A **scheduled** run started. Manual runs do **not** emit `deployment_run.*` events. |\n| `deployment_run.succeeded` | Scheduled run created its session. Same `data.id` (the run ID) as the run's `.started` event — fetch the deployment run for its `session_id`, then subscribe to the session events to follow the work. |\n| `deployment_run.failed` | Scheduled run did not create a session. Same `data.id` as the run's `.started` event — fetch the deployment run for `error.type` / `error.message`. |\n\n> These are **webhook** `data.type` values — a separate namespace from SSE event types (`session.status_idle`, `span.outcome_evaluation_end`, etc. in `shared/managed-agents-events.md`). Don't reuse SSE constants in webhook handlers.\n\n---\n\n## Delivery behavior & pitfalls\n\n- **No ordering guarantee.** `session.status_idled` may arrive before `session.outcome_evaluation_ended` even if the evaluation finished first. Sort by envelope `created_at` if order matters.\n- **Retries carry the same `event.id`.** At least one retry on non-2xx. Dedupe on `event.id`.\n- **3xx is failure.** Redirects are not followed — update the URL in Console if your endpoint moves.\n- **Auto-disable** after ~20 consecutive failed deliveries, or immediately if the hostname resolves to a private IP or returns a redirect. Re-enable manually in Console.\n- **Thin payload is intentional.** Don't expect `stop_reason`, `outcome_evaluations`, credential secrets, etc. on the webhook body — fetch the resource.\n</doc>\n\n<doc path=\"shared/model-migration.md\">\n# Model Migration Guide\n\n> **If you arrived via `/claude-api migrate`:** this is the right file. Execute the steps below in order — do not summarize them back to the user. Start with Step 0 (confirm scope) before touching any file.\n\nHow to move existing code to newer Claude models. Covers breaking changes, deprecated parameters, and drop-in replacements for retired models.\n\nFor the latest, authoritative version (with code samples in every supported language), WebFetch the **Migration Guide** URL from `shared/live-sources.md`. Use this file for the consolidated, skill-resident reference; fall back to the live docs whenever a model launch or breaking change may have shifted the picture.\n\n**This file is large.** Use the section names below to jump (or `Grep` this file for the heading text). Read Step 0 and Step 1 first — they apply to every migration. Then read only the per-target section for the model you are migrating to.\n\n| Section | When you need it |\n|---|---|\n| Step 0: Confirm the migration scope | Always — before any edits |\n| Step 1: Classify each file | Always — decides whether to swap, add-alongside, or skip |\n| Per-SDK Syntax Reference | Translate the Python examples in this guide to TypeScript / Go / Ruby / Java / C# / PHP |\n| Destination Models / Retired Model Replacements | Picking a target model |\n| Breaking Changes by Source Model | Migrating to Opus 4.6 / Sonnet 4.6 |\n| Migrating to Opus 4.7 | Migrating to Opus 4.7 (breaking changes, silent defaults, behavioral shifts) |\n| Opus 4.7 Migration Checklist | The required vs optional items for 4.7, tagged `[BLOCKS]` / `[TUNE]` |\n| Migrating to Opus 4.8 | Migrating to Opus 4.8 (no new breaking changes; mid-session system prompts; behavioral re-tuning) |\n| Opus 4.8 Migration Checklist | The required vs optional items for 4.8, tagged `[BLOCKS]` / `[TUNE]` |\n| Migrating to Claude Sonnet 5 | Migrating Sonnet 4.6 → Claude Sonnet 5 (adaptive thinking on by default; non-default sampling params 400; new tokenizer; `xhigh` effort for coding/agentic; high-res vision; behavioral re-tuning) |\n| Claude Sonnet 5 Migration Checklist | The required vs optional items, tagged `[BLOCKS]` / `[TUNE]` |\n| Migrating to Claude Fable 5 | Migrating to Claude Fable 5 or Claude Mythos 5 (always-on thinking, raw chain of thought never returned, refusal handling, data retention, behavioral shifts + prompting guidance) |\n| Claude Fable 5 Migration Checklist | The required vs optional items for Claude Fable 5, tagged `[BLOCKS]` / `[TUNE]` |\n| Verify the Migration | After edits — runtime spot-check |\n\n**TL;DR:** Change the model ID string. If you were using `budget_tokens`, switch to `thinking: {type: \"adaptive\"}`. If you were using assistant prefills, they 400 on both Opus 4.6 and Sonnet 4.6 — switch to one of the prefill replacements (most often `output_config.format`; see the table in Breaking Changes by Source Model). If you're moving from Sonnet 4.5 to Sonnet 4.6, set `effort` explicitly — 4.6 defaults to `high`. Remove the `effort-2025-11-24` and `fine-grained-tool-streaming-2025-05-14` beta headers (GA on 4.6); remove `interleaved-thinking-2025-05-14` once you're on adaptive thinking (keep it only while using the transitional `budget_tokens` escape hatch). Then drop back from `client.beta.messages.create` to `client.messages.create`. Dial back any aggressive \"CRITICAL: YOU MUST\" tool instructions; 4.6 follows the system prompt much more closely.\n\n---\n\n## Step 0: Confirm the migration scope\n\n**Before any Write, Edit, or MultiEdit call, confirm the scope.** If the user's request does not explicitly name a single file, a specific directory, or an explicit file list, **ask first — do not start editing**. This is non-negotiable: even imperative-sounding requests like \"migrate my codebase\", \"move my project to X\", \"upgrade to Sonnet 4.6\", or bare \"migrate to Opus 4.7\" leave the scope ambiguous and require a clarifying question. Phrases like \"my project\", \"my code\", \"my codebase\", \"the whole thing\", \"everywhere\", or \"across the repo\" are **ambiguous, not directive** — they tell you *what* to do but not *where*. Ask before doing.\n\nOffer the common scopes explicitly and wait for the answer before touching any file:\n\n1. The entire working directory\n2. A specific subdirectory (e.g. `src/`, `app/`, `services/billing/`)\n3. A specific file or a list of files\n\nSurface this as a single clarifying question so the user can answer in one turn. **Proceed without asking only when the scope is already unambiguous** — the user named an exact file (\"migrate `extract.py` to Sonnet 4.6\"), pointed at a specific directory (\"migrate everything under `services/billing/` to Opus 4.6\"), listed specific files (\"update `a.py` and `b.py`\"), or already answered the scope question in an earlier turn. If you can answer the question \"which files is this change going to touch?\" with a precise list from the prompt alone, proceed. If not, ask.\n\n**Worked example.** If the user says *\"Move my project to Opus 4.6. I want adaptive thinking everywhere it makes sense.\"* you do not know whether \"my project\" means the whole working directory, just `src/`, just the production code, or something else — the `everywhere` makes the intent clear (update every call site *within scope*) but the scope itself is still not defined. Do not start editing. Respond with:\n\n> Before I start editing, can you confirm the scope? I can migrate:\n> 1. Every `.py` file in the working directory\n> 2. Just the files under `src/` (production code)\n> 3. A specific subdirectory or list of files you name\n>\n> Which one?\n\nThen wait for the answer. The same applies to *\"Migrate to Opus 4.7\"* and bare *\"Help me upgrade to Sonnet 4.6\"* — ask before editing.\n\n**Sizing the scope question (large repos).** Before asking, get a per-directory count so the user can pick concretely:\n\n```sh\nrg -l \"<old-model-id>\" --type-not md | cut -d/ -f1 | sort | uniq -c | sort -rn\n```\n\nPresent the breakdown in your scope question (e.g. *\"Found 217 references across 3 directories: api/ (130), api-go/ (62), routing/ (25). Which to migrate?\"*). Also confirm `git status` is clean before surveying — unexpected modifications mean a concurrent process; stop and investigate before proceeding.\n\n---\n\n## Step 1: Classify each file\n\nNot every file that contains the old model ID is a **caller** of the API. Before editing, classify each file into one of these buckets — the right action differs:\n\n| # | Bucket | What it looks like | Action |\n|---|---|---|---|\n| 1 | **Calls the API/SDK** | `client.messages.create(model=…)`, `anthropic.Anthropic()`, request payloads | Swap the model ID **and** apply the breaking-change checklist for the target version (below). |\n| 2 | **Defines or serves the model** | Model registries, OpenAPI specs, routing/queue configs, model-policy enums, generated catalogs | The old entry **stays** (the model is still served). Ask whether to (a) add the new model alongside, (b) leave alone, or (c) retire the old model — never blind-replace. **If you can't ask, default to (a): add the new model alongside and flag it** — replacing would de-register a model that's still in production. |\n| 3 | **References the ID as an opaque string** | UI fallback constants, capability-gate substring checks, generic test fixtures, label parsers, env defaults | Usually swap the string and verify any parser/regex/substring match handles the new ID — but check the sub-cases below first. |\n| 4 | **Suffixed variant ID** | `claude-<model>-<suffix>` like `-fast`, `-1024k`, `-200k`, `[1m]`, dated snapshots | These are deployment/routing identifiers, not the public model ID. **Do not assume a new-model equivalent exists.** Verify in the registry first; if absent, leave the string alone and flag it. **Exception: `-fast` strings (e.g. `claude-opus-4-6-fast`) are handled by the Fast Mode section below**, which rewrites them to Opus 4.8 plus `speed=\"fast\"` and the `fast-mode-2026-02-01` beta rather than leaving them in place. |\n\n**Bucket 3 sub-cases — before swapping a string reference, check:**\n\n- **Capability gate** (e.g. `if 'opus-4-6' in model_id:` enables a feature) → **add the new ID alongside**, don't replace. The old model is still served and still has the capability, so replacing would silently disable the feature for any old-model traffic that still flows through. If you know no old-model traffic will hit this gate (single-caller codebase fully migrating), replacing is fine; if unsure, add alongside.\n- **Registry-assert test** (e.g. `assert \"claude-X\" in supported_models`, `test_X_has_N_clusters`) → **add an assertion for the new model alongside; keep the old one.** The old model is still served, so its assertion stays valid — but the registry should also include the new model, so assert that too. Heuristic: if the test references multiple model versions in a list, it's a registry test; if one model in a struct compared only to itself, it's a generic fixture.\n- **Frozen / generated snapshot** → **regenerate**, don't hand-edit.\n- **Coupled to a definer** (e.g. an integration test that passes model authorization via a shared `conftest` seed list, or asserts on a billing-tier / rate-limit-group enum or a generated SKU/pricing catalog) → **verify the definer has a new-model entry first.** If not, add a seed entry (reusing the nearest existing tier as a placeholder); if you can't confidently do that, ask the user how to populate the definer. **Do not skip the test.** Swapping without populating the definer will make the test fail at runtime.\n\nWhen migrating tests specifically: breaking parameters (`temperature`, `top_p`, `budget_tokens`) are usually absent — test fixtures rarely set sampling params on placeholder models. The breaking-change scan is still required, but expect mostly clean results.\n\n**Find intentionally-flagged sync points first.** Many codebases tag spots that must change at every model launch with comment markers like `MODEL LAUNCH`, `KEEP IN SYNC`, `@model-update`, or similar. Grep for whatever convention the repo uses *before* the broad model-ID grep — those markers point at the load-bearing changes.\n\n---\n\n## Per-SDK Syntax Reference\n\nCode examples in this guide are Python. **The same fields exist in every official Anthropic SDK** — Stainless generates all 7 from the same OpenAPI spec, so JSON field names map 1:1 with only case-convention differences. Use the rows below to translate the Python examples to the SDK you are migrating.\n\n> **Verify type and method names against the SDK source before writing them into customer code.** WebFetch the relevant repository from the SDK source-code table in `shared/live-sources.md` (one row per SDK) and confirm the exact symbol — particularly for typed SDKs (Go, Java, C#) where union/builder names can differ from the JSON shape. Do not guess type names that aren't in the table below or in `<lang>/claude-api/README.md`.\n\n\n### `thinking` — `budget_tokens` → adaptive\n\n| SDK | Before | After |\n|---|---|---|\n| Python | `thinking={\"type\": \"enabled\", \"budget_tokens\": N}` | `thinking={\"type\": \"adaptive\"}` |\n| TypeScript | `thinking: { type: 'enabled', budget_tokens: N }` | `thinking: { type: 'adaptive' }` |\n| Go | `Thinking: anthropic.ThinkingConfigParamOfEnabled(N)` | `Thinking: anthropic.ThinkingConfigParamUnion{OfAdaptive: &anthropic.ThinkingConfigAdaptiveParam{}}` |\n| Ruby | `thinking: { type: \"enabled\", budget_tokens: N }` | `thinking: { type: \"adaptive\" }` |\n| Java | `.thinking(ThinkingConfigEnabled.builder().budgetTokens(N).build())` | `.thinking(ThinkingConfigAdaptive.builder().build())` |\n| C# | `Thinking = new ThinkingConfigEnabled { BudgetTokens = N }` | `Thinking = new ThinkingConfigAdaptive()` |\n| PHP | `thinking: ['type' => 'enabled', 'budget_tokens' => N]` | `thinking: ['type' => 'adaptive']` |\n\n### Sampling parameters — `temperature` / `top_p` / `top_k`\n\n(Remove the field entirely on Opus 4.7; on Claude 4.x keep at most one of `temperature` or `top_p`.)\n\n| SDK | Field(s) to remove |\n|---|---|\n| Python | `temperature=…`, `top_p=…`, `top_k=…` |\n| TypeScript | `temperature: …`, `top_p: …`, `top_k: …` |\n| Go | `Temperature: anthropic.Float(…)`, `TopP: anthropic.Float(…)`, `TopK: anthropic.Int(…)` |\n| Ruby | `temperature: …`, `top_p: …`, `top_k: …` |\n| Java | `.temperature(…)`, `.topP(…)`, `.topK(…)` |\n| C# | `Temperature = …`, `TopP = …`, `TopK = …` |\n| PHP | `temperature: …`, `topP: …`, `topK: …` |\n\n### Prefill replacement — structured outputs via `output_config.format`\n\n| SDK | Remove (last assistant turn) | Add |\n|---|---|---|\n| Python | `{\"role\": \"assistant\", \"content\": \"…\"}` | `output_config={\"format\": {\"type\": \"json_schema\", \"schema\": SCHEMA}}` |\n| TypeScript | `{ role: 'assistant', content: '…' }` | `output_config: { format: { type: 'json_schema', schema: SCHEMA } }` |\n| Go | trailing `anthropic.MessageParam{Role: \"assistant\", …}` | `OutputConfig: anthropic.OutputConfigParam{Format: anthropic.JSONOutputFormatParam{…}}` |\n| Ruby | `{ role: \"assistant\", content: \"…\" }` | `output_config: { format: { type: \"json_schema\", schema: SCHEMA } }` |\n| Java | trailing `Message.builder().role(ASSISTANT)…` | `.outputConfig(OutputConfig.builder().format(JsonOutputFormat.builder()…build()).build())` |\n| C# | trailing `new Message { Role = \"assistant\", … }` | `OutputConfig = new OutputConfig { Format = new JsonOutputFormat { … } }` |\n| PHP | trailing `['role' => 'assistant', 'content' => '…']` | `outputConfig: ['format' => ['type' => 'json_schema', 'schema' => $SCHEMA]]` |\n\n### `thinking.display` — opt back into summarized reasoning (Opus 4.7)\n\n| SDK | Add |\n|---|---|\n| Python | `thinking={\"type\": \"adaptive\", \"display\": \"summarized\"}` |\n| TypeScript | `thinking: { type: 'adaptive', display: 'summarized' }` |\n| Go | `Thinking: anthropic.ThinkingConfigParamUnion{OfAdaptive: &anthropic.ThinkingConfigAdaptiveParam{Display: anthropic.ThinkingConfigAdaptiveDisplaySummarized}}` |\n| Ruby | `thinking: { type: \"adaptive\", display: \"summarized\" }` (or `display_:` when constructing the model class directly) |\n| Java | `.thinking(ThinkingConfigAdaptive.builder().display(ThinkingConfigAdaptive.Display.SUMMARIZED).build())` |\n| C# | `Thinking = new ThinkingConfigAdaptive { Display = Display.Summarized }` |\n| PHP | `thinking: ['type' => 'adaptive', 'display' => 'summarized']` |\n\nFor any field not in these tables, the JSON key in the Python example translates directly: `snake_case` for Python/TypeScript/Ruby, `camelCase` named args for PHP, `PascalCase` struct fields for Go/C#, `camelCase` builder methods for Java.\n\n---\n\n## Explain every change you make\n\nMigration edits often look arbitrary to a user who hasn't read the release notes — a removed `temperature`, a deleted prefill, a rewritten system-prompt sentence. **For each edit, tell the user what you changed and why**, tied to the specific API or behavioral change that motivates it. Do this in your summary as you work, not just at the end.\n\nBe especially explicit about **system-prompt edits**. Users are rightly protective of their prompts, and prompt-tuning changes are judgment calls (not hard API requirements). For any prompt edit:\n\n- Quote the before and after text.\n- State the behavioral shift that motivates it (e.g. *\"Opus 4.7 calibrates response length to task complexity, so I added an explicit length instruction\"*, or *\"4.6 follows instructions more literally, so 'CRITICAL: YOU MUST use the search tool' will now overtrigger — softened to 'Use the search tool when…'\"*).\n- Make clear which prompt edits are **optional tuning** (tone, length, subagent guidance) versus which code edits are **required to avoid a 400** (sampling params, `budget_tokens`, prefills). Never present an optional prompt change as mandatory.\n\nIf you're applying several prompt-tuning edits at once, offer them as a short list the user can accept or decline item-by-item rather than silently rewriting their system prompt.\n\n---\n\n## Before You Migrate\n\n1. **Confirm the target model ID.** Use only the exact strings from `shared/models.md` — do not append date suffixes to aliases (`claude-opus-4-6`, not `claude-opus-4-6-20251101`). Guessing an ID will 404.\n2. **Check which features your code uses** with this checklist:\n   - `thinking: {type: \"enabled\", budget_tokens: N}` → migrate to adaptive thinking on Opus 4.6 / Sonnet 4.6 (still functional but deprecated)\n   - Assistant-turn prefills (`messages` ending with `role: \"assistant\"`) → must change on Opus 4.6 / Sonnet 4.6 (returns 400)\n   - `output_format` parameter on `messages.create()` → must change on all models (deprecated API-wide)\n   - `max_tokens > ~16000` → must stream on any model (above ~16K risks SDK HTTP timeouts). When streaming, every current model reaches 128K except Haiku 4.5, which caps at 64K\n   - Beta headers `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `interleaved-thinking-2025-05-14` → GA on 4.6, remove them and switch from `client.beta.messages.create` to `client.messages.create`\n   - Moving Sonnet 4.5 → Sonnet 4.6 with no `effort` set → 4.6 defaults to `high`, which may change your latency/cost profile\n   - System prompts with `CRITICAL`, `MUST`, `If in doubt, use X` language → likely to overtrigger on 4.6 (see Prompt-Behavior Changes)\n   - Coming from 3.x / 4.0 / 4.1: also check sampling params (`temperature` + `top_p`), tool versions (`text_editor_20250728`), `refusal` + `model_context_window_exceeded` stop reasons, trailing-newline tool-param handling\n3. **Test on a single request first.** Run one call against the new model, inspect the response, then roll out.\n\n---\n\n## Destination Models (recommended targets)\n\n| If you're on…                         | Migrate to         | Why                                               |\n| ------------------------------------- | ------------------ | ------------------------------------------------- |\n| Claude Mythos Preview (`claude-mythos-preview`) | `claude-mythos-5` (Project Glasswing successor) or `claude-fable-5` (GA) | Same tokenizer family — mostly a model-ID swap; remove `thinking` config and prefill; see Migrating to Claude Fable 5 |\n| Opus 4.7                              | `claude-opus-4-8`  | Most capable Opus-tier model; same API surface as 4.7 (no new breaking changes) — mostly prompt re-tuning; see Migrating to Opus 4.8 |\n| Opus 4.6                              | `claude-opus-4-8`  | Apply the Opus 4.7 breaking changes, then the 4.8 re-tuning |\n| Opus 4.0 / 4.1 / 4.5 / Opus 3         | `claude-opus-4-8`  | Apply 4.6 → 4.7 → 4.8 in order (adaptive thinking, drop sampling params, then re-tune) |\n| Sonnet 4.6                            | `claude-sonnet-5` | Near-Opus quality on agentic and coding work at Sonnet cost; adaptive thinking on by default; see Migrating to Claude Sonnet 5 |\n| Sonnet 4.0 / 4.5 / 3.7 / 3.5          | `claude-sonnet-5` | Apply the Sonnet 4.6 changes first, then the Claude Sonnet 5 section |\n| Haiku 3 / 3.5                         | `claude-haiku-4-5` | Fastest and most cost-effective                   |\n\nDefault to the latest Opus for the caller's tier unless they explicitly chose otherwise. The Opus migrations layer: if you're on Opus 4.6 or older, apply each version's section in order up to your target (e.g. 4.5 → 4.8 means the 4.6, 4.7, and 4.8 sections in sequence). A 4.7 → 4.8 move has no new breaking changes — see Migrating to Opus 4.8 below.\n\n---\n\n## Retired Model Replacements\n\nThese models return 404 — update immediately:\n\n| Retired model                 | Retired       | Drop-in replacement  |\n| ----------------------------- | ------------- | -------------------- |\n| `claude-3-7-sonnet-20250219`  | Feb 19, 2026  | `claude-sonnet-5` |\n| `claude-3-5-haiku-20241022`   | Feb 19, 2026  | `claude-haiku-4-5`   |\n| `claude-3-opus-20240229`      | Jan 5, 2026   | `claude-opus-4-8`    |\n| `claude-3-5-sonnet-20241022`  | Oct 28, 2025  | `claude-sonnet-5` |\n| `claude-3-5-sonnet-20240620`  | Oct 28, 2025  | `claude-sonnet-5` |\n| `claude-3-sonnet-20240229`    | Jul 21, 2025  | `claude-sonnet-5` |\n| `claude-2.1`, `claude-2.0`    | Jul 21, 2025  | `claude-sonnet-5` |\n\n## Deprecated Models (retiring soon)\n\n| Model                         | Retires       | Replacement          |\n| ----------------------------- | ------------- | -------------------- |\n| `claude-3-haiku-20240307`     | Apr 19, 2026  | `claude-haiku-4-5`   |\n| `claude-opus-4-20250514`      | June 15, 2026 | `claude-opus-4-8`    |\n| `claude-sonnet-4-20250514`    | June 15, 2026 | `claude-sonnet-5` |\n\n---\n\n## Breaking Changes by Source Model\n\n### Migrating from Sonnet 4.5 to Sonnet 4.6 (effort default change)\n\nSonnet 4.5 had no `effort` parameter; Sonnet 4.6 defaults to `high`. If you just switch the model string and do nothing else, you may see noticeably higher latency and token usage. Set `effort` explicitly.\n\n**Recommended starting points:**\n\n| Workload                                          | Start at       | Notes                                                                                                    |\n| ------------------------------------------------- | -------------- | -------------------------------------------------------------------------------------------------------- |\n| Chat, classification, content generation          | `low`          | With `thinking: {\"type\": \"disabled\"}` you'll see similar or better performance vs. Sonnet 4.5 no-thinking |\n| Most applications (balanced)                      | `medium`       | The default sweet spot for quality vs. cost                                                              |\n| Agentic coding, tool-heavy workflows              | `medium`       | Pair with adaptive thinking and a generous `max_tokens` (up to 128K with streaming — Sonnet 4.6's ceiling) |\n| Autonomous multi-step agents, long-horizon loops  | `high`         | Scale down to `medium` if latency/tokens become a concern                                                 |\n| Computer-use agents                               | `high` + adaptive | Sonnet 4.6's best computer-use accuracy is on adaptive + high                                          |\n\nFor non-thinking chat workloads specifically:\n\n```python\nclient.messages.create(\n    model=\"claude-sonnet-4-6\",\n    max_tokens=8192,\n    thinking={\"type\": \"disabled\"},\n    output_config={\"effort\": \"low\"},\n    messages=[{\"role\": \"user\", \"content\": \"...\"}],\n)\n```\n\n**When to use Opus 4.6 instead:** hardest and longest-horizon problems — large code migrations, deep research, extended autonomous work. Sonnet 4.6 wins on fast turnaround and cost efficiency.\n\n### Migrating to Opus 4.6 / Sonnet 4.6 (from any older model)\n\n**1. Manual extended thinking is deprecated — use adaptive thinking.**\n\n`thinking: {type: \"enabled\", budget_tokens: N}` (manual extended thinking with a fixed token budget) is deprecated on Opus 4.6 and Sonnet 4.6. Replace it with `thinking: {type: \"adaptive\"}`, which lets Claude decide when and how much to think. Adaptive thinking also enables interleaved thinking automatically (no beta header needed).\n\n```python\n# Old (still works on older models, deprecated on 4.6)\nresponse = client.messages.create(\n    model=\"claude-sonnet-4-5\",\n    max_tokens=16000,\n    thinking={\"type\": \"enabled\", \"budget_tokens\": 8000},\n    messages=[...]\n)\n\n# New (Opus 4.6 / Sonnet 4.6)\nresponse = client.messages.create(\n    model=\"claude-opus-4-6\",  # or \"claude-sonnet-4-6\"\n    max_tokens=16000,\n    thinking={\"type\": \"adaptive\"},\n    output_config={\"effort\": \"high\"},  # optional: low | medium | high | max\n    messages=[...]\n)\n```\n\nAdaptive thinking is the long-term target, and on internal evaluations it outperforms manual extended thinking. Move when you can.\n\n**Transitional escape hatch:** manual extended thinking is still *functional* on Opus 4.6 and Sonnet 4.6 (deprecated, will be removed in a future release). If you need a hard ceiling while migrating — for example, to bound token spend on a runaway workload before you've tuned `effort` — you can keep `budget_tokens` around alongside an explicit `effort` value, then remove it in a follow-up. `budget_tokens` must be strictly less than `max_tokens`:\n\n```python\n# Transitional only — deprecated, plan to remove\nclient.messages.create(\n    model=\"claude-sonnet-4-6\",\n    max_tokens=16384,\n    thinking={\"type\": \"enabled\", \"budget_tokens\": 8192},  # must be < max_tokens\n    output_config={\"effort\": \"medium\"},\n    messages=[...],\n)\n```\n\nIf the user asks for a \"thinking budget\" on 4.6, the preferred answer is `effort` — use `low`, `medium`, `high`, or `max` rather than a token count.\n\n**2. Effort parameter (Opus 4.5, Opus 4.6, Sonnet 4.6 only).**\n\nControls thinking depth and overall token spend. Goes inside `output_config`, not top-level. Default is `high`. `max` is supported on Fable 5, Opus 4.6 and later, Sonnet 5, and Sonnet 4.6 — it errors on Sonnet 4.5 and Haiku 4.5.\n\n```python\noutput_config={\"effort\": \"medium\"}  # often the best cost / quality balance\n```\n\n### Migrating to the 4.6 family (Opus 4.6 and Sonnet 4.6)\n\n**3. Assistant-turn prefills return 400 (Opus 4.6 and Sonnet 4.6).**\n\nPrefilled responses on the final assistant turn are no longer supported on either Opus 4.6 or Sonnet 4.6 — both return a 400. Adding assistant messages *elsewhere* in the conversation (e.g., for few-shot examples) still works. Pick the replacement that matches what the prefill was doing:\n\n| Prefill was used for                               | Replacement                                                                                                                               |\n| -------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |\n| Forcing JSON / YAML / schema output                | `output_config.format` with a `json_schema` — see example below                                                                           |\n| Forcing a classification label                     | Tool with an enum field containing valid labels, or structured outputs                                                                    |\n| Skipping preambles (`Here is the summary:\\n`)      | System prompt instruction: *\"Respond directly without preamble. Do not start with phrases like 'Here is...' or 'Based on...'.\"*           |\n| Steering around bad refusals                       | Usually no longer needed — 4.6 refuses far more appropriately. Plain user-turn prompting is sufficient.                                   |\n| Continuing an interrupted response                 | Move continuation into the user turn: *\"Your previous response was interrupted and ended with `[last text]`. Continue from there.\"*     |\n| Injecting reminders / context hydration            | Inject into the user turn instead. For complex agent harnesses, expose context via a tool call or during compaction.                      |\n\n```python\n# Old (fails on Opus 4.6 / Sonnet 4.6) — prefill forcing JSON shape\nmessages=[\n    {\"role\": \"user\", \"content\": \"Extract the name.\"},\n    {\"role\": \"assistant\", \"content\": \"{\\\"name\\\": \\\"\"},\n]\n\n# New — structured outputs replace the prefill\nresponse = client.messages.create(\n    model=\"claude-opus-4-6\",\n    max_tokens=1024,\n    output_config={\"format\": {\"type\": \"json_schema\", \"schema\": {...}}},\n    messages=[{\"role\": \"user\", \"content\": \"Extract the name.\"}],\n)\n```\n\n**4. Stream for `max_tokens > ~16K` (all models); only Haiku 4.5 caps lower, at 64K.**\n\nNon-streaming requests hit SDK HTTP timeouts at high `max_tokens`, regardless of model — stream for anything above ~16K output. The streamable ceiling is 128K for every current model except Haiku 4.5, which caps at 64K.\n\n```python\nwith client.messages.stream(model=\"claude-opus-4-6\", max_tokens=64000, ...) as stream:\n    message = stream.get_final_message()\n```\n\n**5. Tool-call JSON escaping may differ (Opus 4.6 and Sonnet 4.6).**\n\nBoth 4.6 models can produce tool call `input` fields with Unicode or forward-slash escaping. Always parse with `json.loads()` / `JSON.parse()` — never raw-string-match the serialized input.\n\n### All models\n\n**6. `output_format` → `output_config.format` (API-wide).**\n\nThe old top-level `output_format` parameter on `messages.create()` is deprecated. Use `output_config.format` instead. This is not 4.6-specific — applies to every model.\n\n---\n\n## Beta Headers to Remove on 4.6\n\nSeveral beta headers that were required on 4.5 are now GA on 4.6 and should be removed. Leaving them in is harmless but misleading; removing them also lets you move from `client.beta.messages.create(...)` back to `client.messages.create(...)`.\n\n| Header                                    | Status on 4.6                                              | Action                                                  |\n| ----------------------------------------- | ---------------------------------------------------------- | ------------------------------------------------------- |\n| `effort-2025-11-24`                       | Effort parameter is GA                                     | Remove                                                  |\n| `fine-grained-tool-streaming-2025-05-14`  | GA                                                         | Remove                                                  |\n| `interleaved-thinking-2025-05-14`         | Adaptive thinking enables interleaved thinking automatically | Remove when using adaptive thinking; still functional on Sonnet 4.6 *with* manual extended thinking, but that path is deprecated |\n| `token-efficient-tools-2025-02-19`        | Built in to all Claude 4+ models                           | Remove (no effect)                                      |\n| `output-128k-2025-02-19`                  | Built in to Claude 4+ models                               | Remove (no effect)                                      |\n\nOnce you remove all of these and finish moving to adaptive thinking, you can switch the SDK call site from the beta namespace back to the regular one:\n\n```python\n# Before\nresponse = client.beta.messages.create(\n    model=\"claude-opus-4-5\",\n    betas=[\"interleaved-thinking-2025-05-14\", \"effort-2025-11-24\"],\n    ...\n)\n\n# After\nresponse = client.messages.create(\n    model=\"claude-opus-4-6\",\n    thinking={\"type\": \"adaptive\"},\n    output_config={\"effort\": \"high\"},\n    ...\n)\n```\n\n---\n\n## Additional Changes When Coming from 3.x / 4.0 / 4.1 → 4.6\n\nIf you're jumping from Opus 4.1, Sonnet 4, Sonnet 3.7, or an older Claude 3.x model directly to 4.6, apply everything above *plus* the items in this section. Users already on Opus 4.5 / Sonnet 4.5 can skip this.\n\n**1. Sampling parameters: `temperature` OR `top_p`, not both.**\n\nPassing both will error on every Claude 4+ model:\n\n```python\n# Old (3.x only — errors on 4+)\nclient.messages.create(temperature=0.7, top_p=0.9, ...)\n\n# New\nclient.messages.create(temperature=0.7, ...)  # or top_p, not both\n```\n\n**2. Update tool versions.**\n\nLegacy tool versions are not supported on 4+. **Both the `type` and the `name` field change** — `text_editor_20250728` and `str_replace_based_edit_tool` are a pair; updating one without the other 400s. Also remove the `undo_edit` command from your text-editor integration:\n\n| Old                                               | New                                                     |\n| ------------------------------------------------- | ------------------------------------------------------- |\n| `text_editor_20250124` + `str_replace_editor`     | `text_editor_20250728` + `str_replace_based_edit_tool`  |\n| `code_execution_*` (earlier versions)             | `code_execution_20260521`                               |\n| `undo_edit` command                               | *(no longer supported — delete call sites)*             |\n\n```python\n# Before\ntools = [{\"type\": \"text_editor_20250124\", \"name\": \"str_replace_editor\"}]\n\n# After — BOTH fields change\ntools = [{\"type\": \"text_editor_20250728\", \"name\": \"str_replace_based_edit_tool\"}]\n```\n\n**3. Handle the `refusal` stop reason.**\n\nClaude 4+ can return `stop_reason: \"refusal\"` on the response. If your code only handles `end_turn` / `tool_use` / `max_tokens`, add a branch:\n\n```python\nif response.stop_reason == \"refusal\":\n    # Surface the refusal to the user; do not retry with the same prompt\n    ...\n```\n\n**4. Handle the `model_context_window_exceeded` stop reason (4.5+).**\n\nDistinct from `max_tokens`: it means the model hit the *context window* limit, not the requested output cap. Handle both:\n\n```python\nif response.stop_reason == \"model_context_window_exceeded\":\n    # Context window exhausted — compact or split the conversation\n    ...\nelif response.stop_reason == \"max_tokens\":\n    # Requested output cap hit — retry with higher max_tokens or stream\n    ...\n```\n\n**5. Trailing newlines preserved in tool call string parameters (4.5+).**\n\n4.5 and 4.6 preserve trailing newlines that older models stripped. If your tool implementations do exact string matching against tool-call `input` values (e.g., `if name == \"foo\"`), verify they still match when the model sends `\"foo\\n\"`. Normalizing with `.rstrip()` on the receiving side is usually the simplest fix.\n\n**6. Haiku: rate limits reset between generations.**\n\nHaiku 4.5 has its own rate-limit pool separate from Haiku 3 / 3.5. If you're ramping traffic as you migrate, check your tier's Haiku 4.5 limits at [API rate limits](https://platform.claude.com/docs/en/api/rate-limits) — a quota that comfortably served Haiku 3.5 traffic may need a tier bump for the same volume on 4.5.\n\n---\n\n## Prompt-Behavior Changes (Opus 4.5 / 4.6, Sonnet 4.6)\n\nThese don't break your code, but prompts that worked on 4.5-and-earlier may over- or under-trigger on 4.6. Tune as needed.\n\n**1. Aggressive instructions cause overtriggering.** Opus 4.5 and 4.6 follow the system prompt much more closely than earlier models. Prompts written to *overcome* the old reluctance are now too aggressive:\n\n| Before (worked on 4.0 / 4.5)                | After (use on 4.6)                        |\n| ------------------------------------------- | ----------------------------------------- |\n| `CRITICAL: You MUST use this tool when...`  | `Use this tool when...`                   |\n| `Default to using [tool]`                   | `Use [tool] when it would improve X`      |\n| `If in doubt, use [tool]`                   | *(delete — no longer needed)*             |\n\nIf the model is now overtriggering a tool or skill, the fix is almost always to dial back the language, not to add more guardrails.\n\n**2. Overthinking and excessive exploration (Opus 4.6).** At higher `effort` settings, Opus 4.6 explores more before answering. If that burns too many thinking tokens, lower `effort` first (`medium` is often the sweet spot) before adding prose instructions to constrain reasoning.\n\n**3. Overeager subagent spawning (Opus 4.6).** Opus 4.6 has a strong preference for delegating to subagents. If you see it spawning a subagent for something a direct `grep` or `read` would solve, add guidance: *\"Use subagents only for parallel or independent workstreams. For single-file reads or sequential operations, work directly.\"*\n\n**4. Overengineering (Opus 4.5 / 4.6).** Both models may add extra files, abstractions, or defensive error handling beyond what was asked. If you want minimal changes, prompt for it explicitly: *\"Only make changes directly requested. Don't add helpers, abstractions, or error handling for scenarios that can't happen.\"*\n\n**5. LaTeX math output (Opus 4.6).** Opus 4.6 defaults to LaTeX (`\\frac{}{}`, `$...$`) for math and technical content. If you need plain text, instruct it explicitly: *\"Format all math as plain text — no LaTeX, no `$`, no `\\frac{}{}`. Use `/` for division and `^` for exponents.\"*\n\n**6. Skipped verbal summaries (4.6 family).** The 4.6 models are more concise and may skip the summary paragraph after a tool call, jumping straight to the next action. If you rely on those summaries for visibility, add: *\"After completing a task that involves tool use, provide a brief summary of what you did.\"*\n\n**7. \"Think\" as a trigger word (Opus 4.5 with thinking disabled).** When `thinking` is off, Opus 4.5 is particularly sensitive to the word *think* and may reason more than you want. Use `consider`, `evaluate`, or `reason through` instead.\n\n---\n\n## Model-ID Rename Quick Reference\n\n| Old string (migration source)  | New string         |\n| ------------------------------ | ------------------ |\n| `claude-opus-4-7`              | `claude-opus-4-8`  |\n| `claude-opus-4-6`              | `claude-opus-4-8`  |\n| `claude-opus-4-5`              | `claude-opus-4-8`  |\n| `claude-opus-4-1`              | `claude-opus-4-8`  |\n| `claude-opus-4-0`              | `claude-opus-4-8`  |\n| `claude-mythos-preview`        | `claude-mythos-5` (Project Glasswing) or `claude-fable-5` |\n| `claude-sonnet-4-6`            | `claude-sonnet-5`|\n| `claude-sonnet-4-5`            | `claude-sonnet-5`|\n| `claude-sonnet-4-0`            | `claude-sonnet-5`|\n\nOlder aliases (`claude-opus-4-7`, `claude-opus-4-6`, `claude-opus-4-5`, `claude-sonnet-4-6`, `claude-sonnet-4-5`, etc.) are still active and can be pinned if you need time before upgrading — see `shared/models.md` for the full legacy list.\n\n### Amazon Bedrock model IDs\n\nIf the code uses the `AnthropicBedrockMantle` client (Python `anthropic[bedrock]`, TypeScript `@anthropic-ai/bedrock-sdk`, Java `BedrockMantleBackend`, Go `bedrock.NewMantleClient`, etc.) or targets `https://bedrock-mantle.{region}.api.aws/anthropic`, it is running on **Claude in Amazon Bedrock**. All breaking changes in this guide apply unchanged there — it serves the same Messages API shape — but model IDs carry an `anthropic.` provider prefix:\n\n| First-party ID | Bedrock ID |\n|---|---|\n| `claude-opus-4-8` | `anthropic.claude-opus-4-8` |\n| `claude-opus-4-7` | `anthropic.claude-opus-4-7` |\n| `claude-sonnet-5` | `anthropic.claude-sonnet-5` |\n| `claude-haiku-4-5` | `anthropic.claude-haiku-4-5` |\n\nWhen migrating a Bedrock file, apply the same rename-table row as first-party, then keep/add the `anthropic.` prefix. Do **not** generate a first-party `claude-*` ID for a Bedrock client — it will 400.\n\n**Skip for Bedrock:** the `code_execution_*` tool-version checklist item and the **Task Budgets** section — neither is available on Bedrock (see `shared/platform-availability.md` for the per-feature table). Everything else in this guide — `effort`, adaptive/extended thinking, `output_config.format`, `thinking.display`, fine-grained tool streaming, token counting — is available on Bedrock.\n\n> **Out of scope:** the legacy Amazon Bedrock integration (`InvokeModel` / `Converse` APIs with ARN-versioned IDs like `anthropic.claude-3-5-sonnet-20241022-v2:0`) uses a different request shape and model-ID format. This guide does not cover it; WebFetch the Bedrock page in `shared/live-sources.md` if the user is migrating between the two Bedrock integrations.\n\n### Claude Platform on AWS\n\nIf the code uses `AnthropicAWS` / `AnthropicAws` / `anthropicaws.NewClient` / `AnthropicAwsClient` (or targets `https://aws-external-anthropic.{region}.api.aws`), it is running on **Claude Platform on AWS** — Anthropic-operated, same-day API parity. Model IDs are **bare first-party** strings; apply the rename table above **verbatim** and every breaking-change section in this guide unchanged. There is nothing to skip. Do **not** add an `anthropic.` prefix (that's Amazon Bedrock, a separate offering). See `shared/claude-platform-on-aws.md` for client/auth details.\n\n---\n\n## Migration Checklist\n\nEvery item is tagged: **`[BLOCKS]`** items cause a 400 error, infinite loop, silent timeout, or wrong tool selection if missed — apply these as code edits, not as suggestions. **`[TUNE]`** items are quality/cost adjustments.\n\nFor each file that calls `messages.create()` / equivalent SDK method:\n\n- [ ] **[BLOCKS]** Update the `model=` string to the new alias\n- [ ] **[BLOCKS]** Replace `budget_tokens` with `thinking={\"type\": \"adaptive\"}` (deprecated on Opus 4.6 / Sonnet 4.6)\n- [ ] **[BLOCKS]** Move `format` from top-level `output_format` into `output_config.format`\n- [ ] **[BLOCKS]** Remove any assistant-turn prefills if targeting Opus 4.6 or Sonnet 4.6 (see the prefill replacement table)\n- [ ] **[BLOCKS]** Switch to streaming if `max_tokens > ~16000` (otherwise SDK HTTP timeout)\n- [ ] **[TUNE]** Verify tool-input handling parses JSON rather than raw-string-matching the serialized input (4.6 may escape Unicode / forward slashes differently; most SDKs already expose `block.input` as a parsed object)\n- [ ] **[TUNE]** Set `output_config={\"effort\": \"...\"}` explicitly — especially when moving Sonnet 4.5 → Sonnet 4.6 (4.6 defaults to `high`)\n- [ ] **[TUNE]** Remove GA beta headers: `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `token-efficient-tools-2025-02-19`, `output-128k-2025-02-19`; remove `interleaved-thinking-2025-05-14` once on adaptive thinking\n- [ ] **[TUNE]** Switch `client.beta.messages.create(...)` → `client.messages.create(...)` once all betas are removed\n- [ ] **[TUNE]** Review system prompt for aggressive tool language (`CRITICAL:`, `MUST`, `If in doubt`) and dial it back\n\n**Extra items when coming from 3.x / 4.0 / 4.1:**\n- [ ] **[BLOCKS]** Remove either `temperature` or `top_p` (passing both 400s on Claude 4+)\n- [ ] **[BLOCKS]** Update text-editor tool `type` to `text_editor_20250728`\n- [ ] **[BLOCKS]** Update text-editor tool `name` to `str_replace_based_edit_tool` — **changing only the `type` and keeping `name: \"str_replace_editor\"` returns a 400**\n- [ ] **[BLOCKS]** Update code-execution tool to `code_execution_20260521`\n- [ ] **[BLOCKS]** Delete any `undo_edit` command call sites\n- [ ] **[TUNE]** Add handling for `stop_reason == \"refusal\"`\n- [ ] **[TUNE]** Add handling for `stop_reason == \"model_context_window_exceeded\"` (4.5+)\n- [ ] **[TUNE]** Verify tool-param string matching tolerates trailing newlines (preserved on 4.5+)\n- [ ] **[TUNE]** If moving to Haiku 4.5: review rate-limit tier (separate pool from Haiku 3.x)\n\n**Verification:**\n- [ ] Run one test request and inspect `response.stop_reason`, `response.usage`, and whether tool-use / thinking behavior matches expectations\n\nFor cached prompts: the render order and hash inputs did not change, so existing `cache_control` breakpoints keep working. However, **changing the model string invalidates the existing cache** — the first request on the new model will write the cache fresh.\n\n---\n\n## Migrating to Opus 4.7\n\n> **Model ID `claude-opus-4-7` is authoritative as written here.** When the user asks to migrate to Opus 4.7, write `model=\"claude-opus-4-7\"` exactly. Do **not** WebFetch to verify — this guide is the source of truth for migration target IDs. The corresponding entry exists in `shared/models.md`.\n\nClaude Opus 4.7 was Anthropic's most capable model at its launch and is now the previous-generation Opus (Opus 4.8 is current — see Migrating to Opus 4.8 below). It is highly autonomous and performs exceptionally well on long-horizon agentic work, knowledge work, vision tasks, and memory tasks. This section summarizes everything that was new at the 4.7 launch and remains the layered breaking-change path for callers coming from Opus 4.6 or older. It is layered on top of the 4.6 migration above — if the caller is jumping from Opus 4.5 or older, apply the 4.6 changes first, then this section, then the 4.8 section.\n\n**TL;DR for someone already on Opus 4.6:** update the model ID to `claude-opus-4-7`, strip any remaining `budget_tokens` and sampling parameters (both 400 on Opus 4.7), give `max_tokens` extra headroom and re-baseline with `count_tokens()` against the new model, opt back into `thinking.display: \"summarized\"` if reasoning is surfaced to users, and re-tune `effort` — it matters more on 4.7 than on any prior Opus.\n\n### Breaking changes (will 400 on Opus 4.7)\n\n**Extended thinking removed.**\n\n`thinking: {type: \"enabled\", budget_tokens: N}` is no longer supported on Claude Opus 4.7 or later models and returns a 400 error. Switch to adaptive thinking (`thinking: {type: \"adaptive\"}`) and use the effort parameter to control thinking depth. Adaptive thinking is **off by default** on Claude Opus 4.7: requests with no `thinking` field run without thinking, matching Opus 4.6 behavior. Set `thinking: {type: \"adaptive\"}` explicitly to enable it.\n\n```python\n# Before (Opus 4.6)\nclient.messages.create(\n    model=\"claude-opus-4-6\",\n    max_tokens=64000,\n    thinking={\"type\": \"enabled\", \"budget_tokens\": 32000},\n    messages=[{\"role\": \"user\", \"content\": \"...\"}],\n)\n\n# After (Opus 4.7)\nclient.messages.create(\n    model=\"claude-opus-4-7\",\n    max_tokens=64000,\n    thinking={\"type\": \"adaptive\"},\n    output_config={\"effort\": \"high\"},  # or \"max\", \"xhigh\", \"medium\", \"low\"\n    messages=[{\"role\": \"user\", \"content\": \"...\"}],\n)\n```\n\nIf the caller wasn't using extended thinking, no change is required — thinking is off by default, or can be set explicitly with `thinking={\"type\": \"disabled\"}`.\n\nDelete `budget_tokens` plumbing entirely. For the replacement `effort` value, see **Choosing an effort level on Opus 4.7** below — there is no exact 1:1 mapping from `budget_tokens`.\n\n**Sampling parameters removed.**\n\nThe `temperature`, `top_p`, and `top_k` parameters are no longer accepted on Claude Opus 4.7. Requests that include them return a 400 error. Remove these fields from your request payloads. Prompting is the recommended way to guide model behavior on Claude Opus 4.7. If you were using `temperature = 0` for determinism, note that it never guaranteed identical outputs on prior models.\n\n```python\n# Before — errors on Opus 4.7\nclient.messages.create(temperature=0.7, top_p=0.9, ...)\n\n# After\nclient.messages.create(...)  # no sampling params\n```\n\n- **If the intent was determinism** — use `effort: \"low\"` with a tighter prompt.\n- **If the intent was creative variance** — the prompt replacement depends on the use case; **ask the user** how they want variance elicited. If you can't ask, add a use-case-appropriate instruction along the lines of *\"choose something off-distribution and interesting\"* — e.g. for text generation, *\"Vary your phrasing and structure across responses\"*; for frontend/design, use the propose-4-directions approach under **Design and frontend coding** below.\n\n### Choosing an effort level on Opus 4.7\n\n`budget_tokens` controlled how much to *think*; `effort` controls how much to think *and* act, so there is no exact 1:1 mapping. **Use `xhigh` for best results in coding and agentic use cases, and a minimum of `high` for most intelligence-sensitive use cases.** Experiment with other levels to further tune token usage and intelligence:\n\n| Level | Use when | Notes |\n| --- | --- | --- |\n| `max` | Intelligence-demanding tasks worth testing at the ceiling | Can deliver gains in some use cases but may show diminishing returns from increased token usage; can be prone to overthinking |\n| `xhigh` | **Most coding and agentic use cases** | The best setting for these; used as the default in Claude Code |\n| `high` | Intelligence-sensitive use cases generally | Balances token usage and intelligence; recommended minimum for most intelligence-sensitive work |\n| `medium` | Cost-sensitive use cases that need to reduce token usage while trading off intelligence | |\n| `low` | Short, scoped tasks and latency-sensitive workloads that are not intelligence-sensitive | |\n\n### Silent default changes (no error, but behavior differs)\n\n**Thinking content omitted by default.**\n\nThinking blocks still appear in the response stream on Claude Opus 4.7, but their `thinking` field is empty unless you explicitly opt in. This is a silent change from Claude Opus 4.6, where the default was to return summarized thinking text. To restore summarized thinking content on Claude Opus 4.7, set `thinking.display` to `\"summarized\"`. **The block-field name is unchanged** — it is still `block.thinking` on a `thinking`-type block; do not rename it.\n\n**Detect this:** any code that reads `block.thinking` (or equivalent) from a `thinking`-type block and renders it in a UI, log, or trace. **The fix is the request parameter, not the response handling** — add `display: \"summarized\"` to the `thinking` parameter:\n\n```python\nthinking={\"type\": \"adaptive\", \"display\": \"summarized\"}  # \"display\" is new on Opus 4.7; values: \"omitted\" (default) | \"summarized\"\n```\n\nThe default is `\"omitted\"` on Claude Opus 4.7. If thinking content was never surfaced anywhere, no change needed. If your product streams reasoning to users, the new default appears as a long pause before output begins; set `display: \"summarized\"` to restore visible progress during thinking.\n\n**Updated token counting.**\n\nClaude Opus 4.7 and Claude Opus 4.6 count tokens differently. The same input text produces a higher token count on Claude Opus 4.7 than on Claude Opus 4.6, and `/v1/messages/count_tokens` will return a different number of tokens for Claude Opus 4.7 than it did for Claude Opus 4.6. The token efficiency of Claude Opus 4.7 can vary by workload shape. Prompting interventions, `task_budget`, and `effort` can help control costs and ensure appropriate token usage. Keep in mind that these controls may trade off model intelligence. **Update your `max_tokens` parameters to give additional headroom, including compaction triggers.** Claude Opus 4.7 provides a 1M context window at standard API pricing with no long-context premium.\n\nWhat else to check:\n\n- Client-side token estimators (tiktoken-style approximations) calibrated against 4.6\n- Cost calculators that multiply tokens by a fixed per-token rate\n- Rate-limit retry thresholds keyed to measured token counts\n\nRe-baseline by re-running `client.messages.count_tokens()` against `claude-opus-4-7` on a representative sample of the caller's prompts. Do not apply a blanket multiplier. For cost-sensitive workloads, consider reducing `effort` by one level (e.g. `high` → `medium`). For agentic loops, consider adopting Task Budgets (below).\n\n### New feature: Task Budgets (beta)\n\nOpus 4.7 introduces **task budgets** — tell Claude how many tokens it has for a full agentic loop (thinking + tool calls + final output). The model sees a running countdown and uses it to prioritize work and wrap up gracefully as the budget is consumed.\n\nThis is a **suggestion the model is aware of**, not a hard cap. It is distinct from `max_tokens`, which remains the enforced per-response limit and is *not* surfaced to the model. Use `task_budget` when you want the model to self-moderate; use `max_tokens` as a hard ceiling to cap usage.\n\nRequires beta header `task-budgets-2026-03-13`:\n\n```python\nclient.beta.messages.create(\n    betas=[\"task-budgets-2026-03-13\"],\n    model=\"claude-opus-4-7\",\n    max_tokens=64000,\n    thinking={\"type\": \"adaptive\"},\n    output_config={\n        \"effort\": \"high\",\n        \"task_budget\": {\"type\": \"tokens\", \"total\": 128000},\n    },\n    messages=[...],\n)\n```\n\nSet a generous budget for open-ended agentic tasks and tighten it for latency-sensitive ones. **Minimum `task_budget.total` is 20,000 tokens.** If the budget is too restrictive for the task, the model may complete it less thoroughly, referencing its budget as the constraint. **Do not add `task_budget` during a migration unless you are sure the budget value is right** — if you can run the workload and measure, do so; otherwise ask the user for the value rather than guessing. This is the primary lever for offsetting the token-counting shift on agentic workloads.\n\n### Capability improvements\n\n**High-resolution vision.** Opus 4.7 is the first Claude model with high-resolution image support. Maximum image resolution is **2576 pixels on the long edge** (up from 1568px on Opus 4.6 and prior). This unlocks gains on vision-heavy workloads, especially computer use and screenshot/artifact/document understanding. Coordinates returned by the model now map 1:1 to actual image pixels, so no scale-factor math is needed.\n\nHigh-res support is **automatic on Opus 4.7** — no beta header, no client-side opt-in required. The model accepts larger inputs and returns pixel-accurate coordinates out of the box.\n\n**Token cost.** Full-resolution images on Opus 4.7 can use up to ~3× more image tokens than on prior models (up to ~4784 tokens per image, vs. the previous ~1,600-token cap). If the extra fidelity isn't needed, downsample client-side before sending to control cost — but **do not add downsampling by default during a migration**. If you're not sure whether the pipeline needs the fidelity, ask the user rather than guessing. Use `count_tokens()` on representative images on Opus 4.7 to re-baseline before reacting to any measured cost shift.\n\nBeyond resolution, Opus 4.7 also improves on low-level perception (pointing, measuring, counting) and natural-image bounding-box localization and detection.\n\n**Knowledge work.** Meaningful gains on tasks where the model visually verifies its own output — `.docx` redlining, `.pptx` editing, and programmatic chart/figure analysis (e.g. pixel-level data transcription via image-processing libraries). If prompts have scaffolding like *\"double-check the slide layout before returning\"*, try removing it and re-baselining.\n\n**Memory.** Opus 4.7 is better at writing and using file-system-based memory. If an agent maintains a scratchpad, notes file, or structured memory store across turns, that agent should improve at jotting down notes to itself and leveraging its notes in future tasks.\n\n**User-facing progress updates.** Opus 4.7 provides more regular, higher-quality interim updates during long agentic traces. If the system prompt has scaffolding like *\"After every 3 tool calls, summarize progress\"*, try removing it to avoid excessive user-facing text. If the length or contents of Opus 4.7's updates are not well-calibrated to your use case, explicitly describe what these updates should look like in the prompt and provide examples.\n\n### Real-time cybersecurity safeguards\n\nRequests that involve prohibited or high-risk topics may lead to refusals.\n\n### Fast Mode: Opus 4.8 / 4.7 only\n\nFast mode is available on Opus 4.8 and Opus 4.7. Only surface this if the caller's code actually uses fast mode (e.g. `model=\"claude-opus-4-6-fast\"`, or `speed=\"fast\"` on an unsupported model); if the word \"fast\" does not appear in the code, say nothing about Fast Mode.\n\nWhen you see `model=\"claude-opus-4-6-fast\"` (or any retired `-fast` model string), **the migration edit is** to move the fast-mode traffic onto Opus 4.8, the durable fast-capable tier:\n\n```python\n# Request fast mode on Opus 4.8.\nclient.beta.messages.create(\n    model=\"claude-opus-4-8\", max_tokens=4096,\n    speed=\"fast\", betas=[\"fast-mode-2026-02-01\"],\n    messages=[...],\n)\n```\n\nThat is: switch the model to Opus 4.8 and request fast mode the supported way, using the beta `client.beta.messages.…` endpoint, the `fast-mode-2026-02-01` beta flag, and `speed=\"fast\"` as a top-level request parameter (per-language form in SKILL.md § Fast Mode). Opus 4.7 also supports fast mode today, but it is itself being sunset (fast mode removed by default around Jul 25, 2026), so target Opus 4.8 as the durable choice rather than landing on a tier that is about to lose fast mode. Do **not** leave the code on a retired `-fast` model string — the failure mode differs by version: `claude-opus-4-6-fast` is already retired and the API **silently falls back** to standard Opus 4.6 (no error — the caller loses fast-mode speed without noticing); `claude-opus-4-7-fast`, once removed, will instead return an **API error** (hard failure — requests break outright rather than degrading). Either way, migrate to Opus 4.8 fast mode now.\n\n### Behavioral shifts (prompt-tunable)\n\nThese don't break anything, but prompts tuned for Opus 4.6 may land differently. Opus 4.7 is more steerable than 4.6, so small prompt nudges usually close the gap.\n\n**More literal instruction following.** Claude Opus 4.7 interprets prompts more literally and explicitly than Claude Opus 4.6, particularly at lower effort levels. It will not silently generalize an instruction from one item to another, and it will not infer requests you didn't make. The upside of this literalism is precision and less thrash. It generally performs better for API use cases with carefully tuned prompts, structured extraction, and pipelines where you want predictable behavior. A prompt and harness review may be especially helpful for migration to Claude Opus 4.7.\n\n**Verbosity calibrates to task complexity.** Opus 4.7 scales response length to how complex it judges the task to be, rather than defaulting to a fixed verbosity — shorter answers on simple lookups, much longer on open-ended analysis. If the product depends on a particular length or style, tune the prompt explicitly. To reduce verbosity:\n\n> *\"Provide concise, focused responses. Skip non-essential context, and keep examples minimal.\"*\n\nIf you see specific kinds of over-verbosity (e.g. over-explaining), add instructions targeting those. Positive examples showing the desired level of concision tend to be more effective than negative examples or instructions telling the model what not to do. Do **not** assume existing \"be concise\" instructions should be removed — test first.\n\n**Tone and writing style.** Opus 4.7 is more direct and opinionated, with less validation-forward phrasing and fewer emoji than Opus 4.6's warmer style. As with any new model, prose style on long-form writing may shift. If the product relies on a specific voice, re-evaluate style prompts against the new baseline. If a warmer or more conversational voice is wanted, specify it:\n\n> *\"Use a warm, collaborative tone. Acknowledge the user's framing before answering.\"*\n\n**`effort` matters more than on any prior Opus.** Opus 4.7 respects `effort` levels more strictly, especially at the low end. At `low` and `medium` it scopes work to what was asked rather than going above and beyond — good for latency and cost, but on moderate tasks at `low` there is some risk of under-thinking.\n\n- If shallow reasoning shows up on complex problems, raise `effort` to `high` or `xhigh` rather than prompting around it.\n- If `effort` must stay `low` for latency, add targeted guidance: *\"This task involves multi-step reasoning. Think carefully through the problem before responding.\"*\n- **At `xhigh` or `max`, set a large `max_tokens`** so the model has room to think and act across tool calls and subagents. Start at 64K and tune from there. (`xhigh` is a new effort level on Opus 4.7, between `high` and `max`.)\n\nAdaptive-thinking triggering is also steerable. If the model thinks more often than wanted — which can happen with large or complex system prompts — add: *\"Thinking adds latency and should only be used when it will meaningfully improve answer quality — typically for problems that require multi-step reasoning. When in doubt, respond directly.\"*\n\n**Uses tools less often by default.** Opus 4.7 tends to use tools less often than 4.6 and to use reasoning more. This produces better results in most cases, but for products that rely on tools (search/retrieval, function-calling, computer-use steps), it can drop tool-use rate. Two levers:\n\n- **Raise `effort`** — `high` or `xhigh` show substantially more tool usage in agentic search and coding, and are especially useful for knowledge work.\n- **Prompt for it** — be explicit in tool descriptions or the system prompt about when and how to use the tool, and encourage the model to err on the side of using it more often:\n\n> *\"When the answer depends on information not present in the conversation, you MUST call the `search` tool before answering — do not answer from prior knowledge.\"*\n\n**Fewer subagents by default.** Opus 4.7 tends to spawn fewer subagents than 4.6. This is steerable — give explicit guidance on when delegation is desirable. For a coding agent, for example:\n\n> *\"Do NOT spawn a subagent for work you can complete directly in a single response (e.g. refactoring a function you can already see). Spawn multiple subagents in the same turn when fanning out across items or reading multiple files.\"*\n\n**Design and frontend coding.** Opus 4.7 has stronger design instincts than 4.6, with a consistent default house style: warm cream/off-white backgrounds (around `#F4F1EA`), serif display type (Georgia, Fraunces, Playfair), italic word-accents, and a terracotta/amber accent. This reads well for editorial, hospitality, and portfolio briefs, but will feel off for dashboards, dev tools, fintech, healthcare, or enterprise apps — and it appears in slide decks as well as web UIs.\n\nThe default is persistent. Generic instructions (\"don't use cream,\" \"make it clean and minimal\") tend to shift the model to a different fixed palette rather than producing variety. Two approaches work reliably:\n\n1. **Specify a concrete alternative.** The model follows explicit specs precisely — give exact hex values, typefaces, and layout constraints.\n2. **Have the model propose options before building.** This breaks the default and gives the user control:\n\n   > *\"Before building, propose 4 distinct visual directions tailored to this brief (each as: bg hex / accent hex / typeface — one-line rationale). Ask the user to pick one, then implement only that direction.\"*\n\nIf the caller previously relied on `temperature` for design variety, use approach (2) — it produces meaningfully different directions across runs.\n\nOpus 4.7 also requires less frontend-design prompting than previous models to avoid generic \"AI slop\" aesthetics. Where earlier models needed a lengthy anti-slop snippet, Opus 4.7 generates distinctive, creative frontends with a much shorter nudge. This snippet works well alongside the variety approaches above:\n\n> *\"NEVER use generic AI-generated aesthetics like overused font families (Inter, Roboto, Arial, system fonts), cliched color schemes (particularly purple gradients on white or dark backgrounds), predictable layouts and component patterns, and cookie-cutter design that lacks context-specific character. Use unique fonts, cohesive colors and themes, and animations for effects and micro-interactions.\"*\n\n**Interactive coding products.** Opus 4.7's token usage and behavior can differ between autonomous, asynchronous coding agents with a single user turn and interactive, synchronous coding agents with multiple user turns. Specifically, it tends to use more tokens in interactive settings, primarily because it reasons more after user turns. This can improve long-horizon coherence, instruction following, and coding capabilities in long interactive coding sessions, but also comes with more token usage. To maximize both performance and token efficiency in coding products, use `effort: \"xhigh\"` or `\"high\"`, add autonomous features (like an auto mode), and reduce the number of human interactions required from users.\n\nWhen limiting required user interactions, specify the task, intent, and relevant constraints upfront in the first human turn. Well-specified, clear, and accurate task descriptions upfront help maximize autonomy and intelligence while minimizing extra token usage after user turns — because Opus 4.7 is more autonomous than prior models, this usage pattern helps to maximize performance. In contrast, ambiguous or underspecified prompts conveyed progressively over multiple user turns tend to reduce token efficiency and sometimes performance.\n\n**Code review.** Opus 4.7 is meaningfully better at finding bugs than prior models, with both higher recall and precision. However, if a code-review harness was tuned for an earlier model, it may initially show *lower* recall — this is likely a harness effect, not a capability regression. When a review prompt says \"only report high-severity issues,\" \"be conservative,\" or \"don't nitpick,\" Opus 4.7 follows that instruction more faithfully than earlier models did: it investigates just as thoroughly, identifies the bugs, and then declines to report findings it judges to be below the stated bar. Precision rises, but measured recall can fall even though underlying bug-finding has improved.\n\nRecommended prompt language:\n\n> *\"Report every issue you find, including ones you are uncertain about or consider low-severity. Do not filter for importance or confidence at this stage — a separate verification step will do that. Your goal here is coverage: it is better to surface a finding that later gets filtered out than to silently drop a bug. For each finding, include your confidence level and an estimated severity so a downstream filter can rank them.\"*\n\nThis can be used without an actual second step, but moving confidence filtering out of the finding step often helps. If the harness has a separate verification/dedup/ranking stage, tell the model explicitly that its job at the finding stage is coverage, not filtering. If single-pass self-filtering is wanted, be concrete about the bar rather than using qualitative terms like \"important\" — e.g. *\"report any bugs that could cause incorrect behavior, a test failure, or a misleading result; only omit nits like pure style or naming preferences.\"* Iterate on prompts against a subset of evals to validate recall or F1 gains.\n\n**Computer use.** Computer use works across resolutions up to the new 2576px / 3.75MP maximum. Sending images at **1080p** provides a good balance of performance and cost. For particularly cost-sensitive workloads, **720p** or **1366×768** are lower-cost options with strong performance. Test to find the ideal settings for the use case; experimenting with `effort` can also help tune behavior.\n\n---\n\n## Opus 4.7 Migration Checklist\n\nEvery item is tagged: **`[BLOCKS]`** items cause a 400 error, infinite loop, silent truncation, or empty output if missed — apply these as code edits, not as suggestions. **`[TUNE]`** items are quality/cost adjustments — surface them to the user as recommendations.\n\n`[BLOCKS]` items prefixed with **\"If…\"** or **\"At…\"** are conditional. Before working through the list, **scan the file** for the conditions: does it surface thinking text to a UI/log? Does it set `output_config.effort` to `\"x-high\"` or `\"max\"`? Is it a security workload? Is it a multi-turn agentic loop? Apply only the items whose condition matches.\n\n- [ ] **[BLOCKS]** Replace `thinking: {type: \"enabled\", budget_tokens: N}` with `thinking: {type: \"adaptive\"}` + `output_config.effort`; delete `budget_tokens` plumbing entirely\n- [ ] **[BLOCKS]** Strip `temperature`, `top_p`, `top_k` from request construction\n- [ ] **[BLOCKS]** If thinking content is surfaced to users or stored in logs: add `thinking.display: \"summarized\"` (otherwise the rendered text is empty)\n- [ ] **[BLOCKS]** At `output_config.effort` of `xhigh` or `max`: set `max_tokens` ≥ 64000 (otherwise output truncates mid-thought)\n- [ ] **[TUNE]** Give `max_tokens` and compaction triggers extra headroom; re-run `count_tokens()` against `claude-opus-4-7` on representative prompts to re-baseline (no blanket multiplier)\n- [ ] **[TUNE]** Re-baseline cost and rate-limit dashboards *before* reacting to measured shifts\n- [ ] **[TUNE]** Re-evaluate `effort` per route — use `xhigh` for coding/agentic and a minimum of `high` for most intelligence-sensitive work; it matters more on 4.7 than any prior Opus\n- [ ] **[TUNE]** Multi-turn agentic loops: adopt the API-native Task Budgets (`output_config.task_budget`, beta `task-budgets-2026-03-13`, minimum 20k tokens) — this is for capping *cumulative* spend across a loop; per-turn depth is `effort`\n- [ ] **[TUNE]** Check for ambiguous or underspecified instructions that relied on 4.6 generalizing intent, and update them to be clearer or more precise — 4.7 follows them literally\n- [ ] **[TUNE]** Tool-use workloads: add explicit when/how-to-use guidance to tool descriptions (4.7 reaches for tools less often)\n- [ ] **[TUNE]** Verbosity: test existing length instructions before changing them — 4.7 calibrates length to task complexity, so tune for the desired output rather than assuming a direction\n- [ ] **[TUNE]** Remove forced-progress-update scaffolding (*\"after every N tool calls…\"*)\n- [ ] **[TUNE]** Remove knowledge-work verification scaffolding (*\"double-check the slide layout…\"*) and re-baseline\n- [ ] **[TUNE]** Add tone instruction if a warmer / more conversational voice is needed; re-evaluate style prompts on writing-heavy routes\n- [ ] **[TUNE]** Subagent tool present: add explicit spawn / don't-spawn guidance\n- [ ] **[TUNE]** Frontend/design output: specify a concrete palette/typeface, or have the model propose 4 visual directions before building (the default cream/serif house style is persistent)\n- [ ] **[TUNE]** Interactive coding products: use `effort: \"xhigh\"` or `\"high\"`, add autonomous features (e.g. an auto mode) to reduce human interactions, and specify task/intent/constraints upfront in the first turn\n- [ ] **[TUNE]** Code-review harnesses: remove or loosen \"only report high-severity\" / \"be conservative\" filters and have the model report every finding with confidence + severity; move filtering to a downstream step (4.7 follows severity filters more literally, which can depress measured recall)\n- [ ] **[TUNE]** Vision-heavy pipelines (screenshots, charts, document understanding): leave images at native resolution up to 2576px long edge for the accuracy gain; remove any scale-factor math from coordinate handling (coords are now 1:1 with pixels). No beta header / opt-in needed — high-res is automatic on Opus 4.7.\n- [ ] **[TUNE]** Computer-use pipelines: send screenshots at 1080p for a good performance/cost balance (720p or 1366×768 for cost-sensitive workloads); experiment with `effort` to tune behavior\n- [ ] **[TUNE]** Cost-sensitive image pipelines: full-res images on 4.7 use up to ~4784 tokens vs ~1,600 on prior models (~3×). Downsampling client-side before upload avoids the increase, but **do not downsample by default** — if you're unsure whether fidelity is needed, ask the user. Re-baseline with `count_tokens()` on representative images before reacting to cost shifts.\n\n---\n\n## Migrating to Opus 4.8\n\n> **Model ID `claude-opus-4-8` is authoritative as written here.** When the user asks to migrate to Opus 4.8, write `model=\"claude-opus-4-8\"` exactly. Do **not** WebFetch to verify — this guide is the source of truth for migration target IDs. The corresponding entry exists in `shared/models.md`.\n\nClaude Opus 4.8 is our most capable Opus-tier model — highly autonomous, with state-of-the-art long-horizon agentic execution, knowledge work, and memory. It is layered on top of the Opus 4.7 migration above. If the caller is jumping from Opus 4.6 or older, apply the 4.6 and 4.7 sections first, then this one.\n\n**No new breaking changes.** Opus 4.8 keeps the same request surface as Opus 4.7. The same calls that already work on 4.7 work unchanged on 4.8 — adaptive thinking only (`thinking: {type: \"enabled\", budget_tokens: N}` still 400s; use `{type: \"adaptive\"}`), sampling parameters (`temperature`, `top_p`, `top_k`) still rejected, last-assistant-turn prefills still 400, `thinking.display` still defaults to `\"omitted\"`, and the `low`/`medium`/`high`/`xhigh`/`max` effort levels, Task Budgets (beta), and high-resolution vision all behave as on 4.7. A 4.7 → 4.8 migration is therefore **the model-ID swap plus prompt re-tuning** — there is no required code edit beyond the model string.\n\n**TL;DR for someone already on Opus 4.7:** swap the model ID to `claude-opus-4-8`. Nothing else is required to avoid an error. Then re-tune prompts for the behavioral shifts: 4.8 narrates *more* than 4.7 (add a silence-default if you want 4.7-like terseness), writes in a warmer, less hedged voice, is more deliberate and asks more often (add autonomy guidance to claw back ask-rate), and is more conservative about reaching for search, subagents, file-based memory, and custom tools (add explicit \"when to use this\" triggering). For long-horizon agentic work, give the full task specification up front in one well-specified turn and run at high effort.\n\n### No new API breaking changes (inherited from 4.7)\n\nThese all carry over from Opus 4.7 unchanged — apply them only if the caller is coming from Opus 4.6 or earlier (see the **Migrating to Opus 4.7** section above for the before/after and the SDK-specific syntax):\n\n- `thinking: {type: \"enabled\", budget_tokens: N}` → 400. Use `thinking: {type: \"adaptive\"}` + `output_config.effort`.\n- `temperature`, `top_p`, `top_k` → 400. Remove them; steer with prompting.\n- Last-assistant-turn prefills → 400. Use `output_config.format` (structured outputs) or a system-prompt instruction.\n- `thinking.display` defaults to `\"omitted\"`; set `\"summarized\"` if you surface reasoning to users.\n\nIf the caller is already on Opus 4.7 and these are clean, there is nothing to change here.\n\n### New API feature: mid-session system prompts\n\nYou can deliver trusted instructions partway through a session by placing `{\"role\": \"system\", ...}` entries directly in the `messages` array — without editing the top-level system prompt and invalidating your prompt cache. Use it for things the application learns mid-session: the user delivered async context, a mode toggled (auto-approve enabled), files changed on disk, the remaining token budget dropped.\n\n```python\nmessages=[\n    {\"role\": \"user\", \"content\": [{\"type\": \"tool_result\", \"tool_use_id\": \"...\", \"content\": \"...\"}]},\n    {\"role\": \"system\", \"content\": \"This project's codebase is Go. Write code in Go.\"},\n]\n```\n\nPhrase these as **context, not commands**. State the fact and let Claude act on it; avoid override-style language (\"ignore what the user said\", \"regardless of the user's request\", \"disregard the previous instruction\"). Claude is trained to protect users from instructions that appear to work against them, and that protection applies to the system role too. No beta header is required; available on Claude Opus 4.8. For cache-placement details and the older-model `<system-reminder>` fallback, see `shared/prompt-caching.md` and `shared/agent-design.md`.\n\n### Capability improvements\n\n**Long-horizon agentic execution.** Opus 4.8 is state-of-the-art at long, autonomous agentic work — complex refactors and overnight coding runs that complete without human correction. To get the most out of it, **give the full task specification up front in a single well-specified initial turn and run at high effort** (`effort: \"high\"` or `\"xhigh\"`). Its long-horizon coherence comes partly from reasoning more at each step; combined with a clear up-front goal, that more-intelligent planning often produces more efficient *and* more accurate output than prior frontier models. The \"clear goal up front\" principle maps to two product surfaces: in Claude Code, `/goal` sets direction for the run; with **Managed Agents (CMA)**, state what \"done\" looks like via an **Outcome** (`user.define_outcome` with a gradeable rubric — the harness runs an iterate → grade → revise loop), see `shared/managed-agents-outcomes.md`.\n\n**Effort is a dimension to test, not a fixed setting.** On prior models many reached for `xhigh` reflexively to maximize intelligence. Opus 4.8 has a higher intelligence ceiling, so **start at `high` as the default and iterate** rather than defaulting to `xhigh`. Sweep `medium`, `high`, and `xhigh` on your own eval set and weigh the intelligence ↔ latency ↔ cost tradeoff per route — the relationship isn't monotonic: higher effort up front often *reduces* turn count and total cost on agentic work, while for some tasks `medium` delivers equally good results in less time. Reserve `max` for extremely hard, latency-insensitive cases. The per-level effort table in the **Migrating to Opus 4.7** section above applies unchanged on 4.8.\n\n**Writing voice and clarity.** Testers consistently describe 4.8's prose as clearer, warmer, and less hedged than prior models, with fewer measurable AI vocal tics — especially at higher effort, where it approaches expert-level prose and structure. This is roughly the **opposite** direction from the 4.7 shift (4.7 was more clipped, direct, and less validation-forward). If you added style prompts to counter 4.7's terseness or to inject warmth, re-evaluate them against the new baseline before keeping them — they may now overcorrect. 4.8 is also a stronger thought partner: more thoughtful, more willing to push back, and more likely to infer the right answer from context.\n\n**Code review and debugging.** Stronger real-bug finding and clearer explanations than 4.7 — one-shot fixes where 4.7 needed more, and correctly identifying intermittent flakes rather than declaring \"fixed\" after one clean run. The 4.7 caveat still applies: if a review harness says \"only report high-severity issues\" or \"be conservative\", 4.8 follows it literally and measured recall can drop even though underlying bug-finding improved. Tell the model to report everything and filter downstream (or review a second time) — see the **Code review** guidance in the 4.7 section for the recommended prompt.\n\n### Behavioral shifts (prompt-tunable)\n\nNone of these break code, but prompts tuned for Opus 4.7 may land differently. 4.8 follows instructions well, so small, explicit nudges close the gap.\n\n**Tool triggering is surface-dependent (search & knowledge).** 4.8's tool-triggering is more surface-dependent than in prior models: with a system prompt present it is high-precision / low-recall — web search triggers slightly more often but runs fewer rounds per trigger, while knowledge-retrieval tools (Drive, project knowledge, connected files) trigger *less* often. It searches when it's confident search is needed and otherwise answers from context, which can lower research depth on tasks that need it. Recover should-search rate with an explicit search-first instruction:\n\n> ```\n> <search_first>\n> For questions where current information would change the answer (recent events, current roles or prices, version-specific behavior, or anything the user flags as time-sensitive) search before answering rather than answering from memory. For open-ended research requests, begin searching immediately; do not ask a scoping question first unless the request is genuinely ambiguous about what to research.\n> </search_first>\n> ```\n\n**Under-utilization of subagents, memory, and custom tools.** Separately from search, 4.8 is conservative about reaching for capabilities that need an explicit \"decide to use this\" step — file-based memory, subagent delegation, custom tools. It won't reach for complex or expensive capabilities unless reasonably sure they're needed. This is steerable since 4.8 follows instructions well — say *when* each capability applies, not just that it exists:\n\n> *\"Before any task longer than a few turns, check your memory file for relevant prior context and write new findings to it as you go. When a task fans out across independent items (many files to read, many tests to run, many candidates to check), delegate to subagents rather than iterating serially.\"*\n\nThe same lever works at the **tool-description** level, not just the system prompt: prescriptive descriptions that state *when* to call a tool (e.g. \"Call this when the user asks about current prices or recent events\") give meaningful lift on 4.8 over descriptions that only state what the tool does. Make the trigger condition part of each capability's own `description`.\n\n**More user-facing narration.** 4.8 narrates more than 4.7 — more text between tool calls in long tool-calling sessions, and longer, more detailed end-of-task wrap-ups by default. If you previously added scaffolding to force interim status (\"after every 3 tool calls, summarize progress\"), **remove it** — 4.8 does this on its own. If the narration is too verbose for a coding agent, an explicit silence-default makes it behave like 4.7 with no loss of quality:\n\n> *\"Default to silence between tool calls. Only write text when you find something, change direction, or hit a blocker — one sentence each. Do not narrate routine actions ('Now I'll...', 'Let me check...', 'Looking at...'). When done: one or two sentences on the outcome. Do not recap every file or test — the user has been following along.\"*\n\nFor knowledge-work deliverables (reports, analysis readouts), verbosity responds very well to instructions in user preferences or the user turn — expose a verbosity preference rather than hard-coding a length.\n\n**More deliberate — asks more often.** 4.8 is more deliberate than prior Opus models. On minor decisions it would previously just make (a variable name, a default value, which of two equivalent approaches), it tends to pause and ask, and it often closes a completed task with \"Want me to also…?\" rather than doing the obvious next step or stopping cleanly. This is preferred for high-stakes or unfamiliar codebases, but bugs users when uncalibrated. Grant autonomy on the small stuff while keeping caution where it matters (in Claude Code testing this cut ask-rate by ~12 percentage points with no increase in over-reach):\n\n> *\"For minor choices (naming, formatting, default values, which approach among equivalents), pick a reasonable option and note it rather than asking. For scope changes or destructive actions, still ask first.\"*\n\n**Verbose reasoning when thinking is disabled.** With `thinking: {type: \"disabled\"}`, 4.8 occasionally writes longer explanations of its reasoning into the visible response, which reads as verbose when the user wants a fast, quick answer. The simplest fix is to leave adaptive thinking on — set `thinking: {type: \"adaptive\"}` (the recommended setting; it adjusts how much to think per task). Note adaptive is **not** on when the field is omitted — like Opus 4.7, a request with no `thinking` field runs without thinking, so set it explicitly. If you need thinking off for latency or cost, scope it in the system prompt:\n\n> *\"Respond only with your final answer. Do not include exploratory reasoning, intermediate drafts, diffs you considered but rejected, or meta-commentary about your process.\"*\n\n### Opus 4.8 Migration Checklist\n\nEvery item is tagged: **`[BLOCKS]`** items cause a 400 error if missed; **`[TUNE]`** items are quality/cost adjustments — surface them to the user as recommendations.\n\nFor a caller **already on Opus 4.7**, only the first item is required; everything else is `[TUNE]`. The conditional `[BLOCKS]` item applies only when coming from Opus 4.6 or earlier.\n\n- [ ] **[BLOCKS]** Update the `model=` string to `claude-opus-4-8`\n- [ ] **[BLOCKS]** *(only if coming from Opus 4.6 or earlier)* Apply the **Migrating to Opus 4.7** breaking changes first — `budget_tokens` → adaptive thinking, strip `temperature`/`top_p`/`top_k`, remove last-assistant-turn prefills. These already 400 on 4.7 and continue to 400 on 4.8.\n- [ ] **[TUNE]** Long-horizon / agentic work: put the full task spec in one well-specified first turn and run at `high` or `xhigh` effort (Claude Code: `/goal`; Managed Agents: an Outcome with a gradeable rubric)\n- [ ] **[TUNE]** Effort: sweep `medium` / `high` / `xhigh` on your eval set and pick per route by the intelligence ↔ latency ↔ cost tradeoff (default `high`, `xhigh` for coding/agentic)\n- [ ] **[TUNE]** Research depth & tool use: add a search-first instruction; add explicit triggering guidance for subagents, file-based memory, and custom tools (4.8 under-reaches for these by default) — in the system prompt *and* in each tool's own `description` (prescriptive \"call this when…\" descriptions give measurable lift)\n- [ ] **[TUNE]** Narration: remove forced-progress scaffolding (*\"after every N tool calls…\"*); add a silence-default if a coding agent is too chatty\n- [ ] **[TUNE]** Autonomy: add small-decisions-don't-ask guidance to cut ask-rate, while keeping caution on scope changes / destructive actions\n- [ ] **[TUNE]** Writing voice: re-evaluate style prompts added to counter 4.7's directness — 4.8 is warmer and less hedged by default; re-baseline before keeping them\n- [ ] **[TUNE]** Code-review harnesses: keep the report-everything-filter-downstream pattern (4.8 follows \"only high-severity\" / \"be conservative\" filters literally, which can depress measured recall)\n- [ ] **[TUNE]** Thinking-disabled paths: add a final-answer-only instruction if reasoning leaks into the visible response\n- [ ] **[TUNE]** Consider mid-session system messages (`role:\"system\"` in `messages`; no beta header) for context the app learns mid-session, instead of rebuilding the top-level system prompt and invalidating the cache\n\n---\n\n## Migrating to Claude Sonnet 5\n\n> **Model ID `claude-sonnet-5` is authoritative as written here.** When the user asks to migrate to Claude Sonnet 5, write `model=\"claude-sonnet-5\"` exactly. Do **not** WebFetch to verify — this guide is the source of truth for migration target IDs. The corresponding entry exists in `shared/models.md`.\n\nClaude Sonnet 5 substantially improves on Sonnet 4.6 for coding and agentic work, reaching what was previously Opus-tier quality on many tasks. Its API surface aligns with Opus 4.7/4.8: manual extended thinking is removed (adaptive or disabled only, adaptive is the default), and non-default sampling parameters are rejected. This section is layered on top of the Sonnet 4.6 migration above — if the caller is jumping from Sonnet 4.5 or older, apply the 4.6 changes first, then this one.\n\n**TL;DR for someone already on Sonnet 4.6:** swap the model ID to `claude-sonnet-5`. Replace any remaining `thinking: {type: \"enabled\", budget_tokens: N}` with `thinking: {type: \"adaptive\"}` (the transitional escape hatch is gone — it now 400s), and note that omitting `thinking` now runs adaptive (4.6 ran thinking-off). Strip non-default `temperature`/`top_p`/`top_k`. Re-run `count_tokens()` against `claude-sonnet-5` — the new tokenizer produces ~30% more tokens for the same text, so token-budgeted limits and cost baselines shift even though per-token pricing is unchanged. `effort` defaults to `high`, the same as Sonnet 4.6 — raise to `xhigh` for the hardest coding and agentic tasks (Claude Sonnet 5 supports the full `low`/`medium`/`high`/`xhigh`/`max` range), and give `max_tokens` headroom at `xhigh`/`max` (the new tokenizer means a Sonnet-4.6-tuned `max_tokens` may truncate equivalent output). Then re-tune prompts: Claude Sonnet 5 interprets instructions more literally than 4.6 — holdover style/tone directives now apply at face value; it is more agentic by default and reaches for tools and self-verification loops more readily (with thinking disabled it is less tool-eager — add an explicit nudge); it gives better in-progress updates by default (drop forced \"summarize every N tool calls\" scaffolding); and code-review harnesses with conservative-reporting instructions may see lower recall (tell it to report everything and filter downstream).\n\n### Breaking changes (will 400 on Claude Sonnet 5)\n\nThese bring the Sonnet line onto the same request surface as Opus 4.7/4.8. See the **Per-SDK Syntax Reference** above for the language-specific spelling of each.\n\n**1. Extended thinking removed — adaptive only.** `thinking: {type: \"enabled\", budget_tokens: N}` returns a 400. The transitional escape hatch that still worked on Sonnet 4.6 is gone. Use adaptive thinking with an effort hint:\n\n```python\n# Before — deprecated on Sonnet 4.6, now errors on Claude Sonnet 5\nthinking={\"type\": \"enabled\", \"budget_tokens\": 10000}\n\n# After\nthinking={\"type\": \"adaptive\"},\noutput_config={\"effort\": \"high\"},  # or \"xhigh\" for the hardest coding/agentic tasks\n```\n\nTo turn thinking off entirely, set `thinking: {type: \"disabled\"}` — but see *Adaptive vs. disabled* below before doing so.\n\n**2. Sampling parameters rejected.** Setting `temperature`, `top_p`, or `top_k` to a non-default value returns a 400; omitting the parameter, or passing its default, is still accepted. The safest migration is to omit them entirely and steer with prompting. If the caller was relying on `temperature=0` for determinism, note in the migration comment that it never guaranteed identical outputs.\n\n```python\n# Before\nclient.messages.create(model=\"claude-sonnet-4-6\", temperature=0.2, ...)\n\n# After — omit entirely\nclient.messages.create(model=\"claude-sonnet-5\", ...)\n```\n\n**3. Bedrock only: forced `tool_choice` requires `thinking: {type: \"disabled\"}`.** On Amazon Bedrock, pass `thinking: {type: \"disabled\"}` alongside `tool_choice: {type: \"tool\", name: ...}` or `tool_choice: {type: \"any\"}`. The Claude API and Vertex AI do not require this.\n\n**Not a request-shape error, but handle it: cybersecurity safeguards.** Claude Sonnet 5 is substantially more cyber-capable than Sonnet 4.6, so — like Opus 4.7/4.8 — requests touching prohibited or high-risk topics may be refused. Handle it as a content outcome (see the `refusal` stop-reason guidance in the Claude Fable 5 section if the caller needs a fallback path).\n\n**Unchanged from Sonnet 4.6:** assistant-turn prefills still return a 400 (use `output_config.format` or a system-prompt instruction); the 1M-token context window, the 128k max-output ceiling, prompt caching, batch processing, the Files API, PDF support, vision, and the full server- and client-side tool set all carry over.\n\n### Silent default change: adaptive thinking on when `thinking` is omitted\n\nOn Sonnet 4.6, a request with no `thinking` field runs **without** thinking. On Claude Sonnet 5, the same request runs with **adaptive thinking**. This is not an error — but callers who never set `thinking` will now see thinking output (and spend thinking tokens) where they didn't before. `max_tokens` is a hard limit on total output (thinking + response text), so a workload that ran thinking-off on Sonnet 4.6 by omission may now truncate. Either set `thinking: {type: \"disabled\"}` explicitly to keep the old behavior, or revisit `max_tokens` to leave room for thinking.\n\n### Silent default change: `thinking.display` defaults to `\"omitted\"`\n\n`thinking.display` defaults to `\"omitted\"` on Claude Sonnet 5 (matching Opus 4.7/4.8 and Claude Fable 5); on Sonnet 4.6 it defaulted to `\"summarized\"`. With the default, `thinking` blocks stream with empty text — to a streaming UI this looks like a long pause before output. Combined with the adaptive-on-by-default change above, a Sonnet 4.6 caller who omits `thinking` entirely now gets adaptive thinking *and* empty-text thinking blocks. If you stream reasoning to users, set `thinking: {type: \"adaptive\", display: \"summarized\"}` explicitly. `display` controls visibility only — thinking happens and is billed the same under every setting.\n\n### New tokenizer (~30% more tokens)\n\nClaude Sonnet 5 uses the same new tokenizer as Opus 4.7/4.8. The same input text produces approximately 30% more tokens than on Sonnet 4.6. No request/response shape changes and no code edits are required, but **everything measured or budgeted in tokens shifts**: `usage` fields and `count_tokens()` results for the same text are higher, the 1M context window holds less text, and a `max_tokens` limit tuned for Sonnet 4.6 may truncate equivalent output. Per-token pricing is unchanged at the $3/$15 sticker (introductory $2/$10 per MTok applies through 2026-08-31), so the cost of an equivalent request can differ. Re-run `count_tokens()` against `claude-sonnet-5` rather than reusing counts measured against earlier models, and re-baseline cost dashboards before reacting to measured shifts.\n\n### Choosing an effort level on Claude Sonnet 5\n\n`effort` defaults to `high` when not set (same as Sonnet 4.6 and Opus 4.8). Claude Sonnet 5 supports the full `low`/`medium`/`high`/`xhigh`/`max` range — the first Sonnet-tier model with `xhigh`. **Keep the `high` default for most work and raise to `xhigh` for the hardest coding and agentic tasks**:\n\n| Level    | When to use on Claude Sonnet 5 |\n| -------- | ----- |\n| `max`    | Tasks needing the absolute highest capability with no token constraint. Can deliver gains in some use cases but may show diminishing returns and is sometimes prone to overthinking — test before committing |\n| `xhigh`  | The hardest coding and agentic use cases — the recommended setting for those |\n| `high`   | The default; balances token usage and intelligence for most use cases |\n| `medium` | Cost-saving step-down from the default — comparable to Sonnet 4.6 at `high` |\n| `low`    | Short, scoped tasks and latency-sensitive workloads that aren't intelligence-sensitive (chat, simple lookups) |\n\nAs a rough cross-model mapping when migrating: Claude Sonnet 5 at `medium` is comparable in intelligence to Sonnet 4.6 at `high`, and Claude Sonnet 5 at `high` is comparable to Sonnet 4.6 at `max`. When benchmarking, match by observed thinking length rather than effort name.\n\nClaude Sonnet 5 **respects effort levels strictly, especially at the low end**. At `low` and `medium` it scopes its work to what was asked rather than going above and beyond — good for latency and cost, but on moderately complex tasks at `low` there is some risk of under-thinking. If you observe shallow reasoning on complex problems, **raise effort to `high` or `xhigh` rather than prompting around it**. If you must keep effort at `low` for latency, add targeted guidance:\n\n> *\"This task involves multi-step reasoning. Think carefully through the problem before responding.\"*\n\n**Leave `max_tokens` headroom at `xhigh`/`max`.** Set a large output token budget (up to the 128k cap, unchanged from Sonnet 4.6) so the model has room for thinking and tool calls. On long tasks, adaptive thinking can use a large share of the budget; if the budget is tight you may see a response that is almost entirely thinking followed by a truncated answer and `stop_reason: \"max_tokens\"` — raise `max_tokens` or drop to `medium`. Because Claude Sonnet 5 uses the new tokenizer (~30% more tokens for the same text), `max_tokens` limits tuned for Sonnet 4.6 may truncate equivalent output.\n\n### Adaptive vs. disabled thinking\n\nLeave adaptive thinking on. Claude Sonnet 5 calibrates thinking spend to task complexity; the small added latency is usually worth the quality gain. If the caller was running Sonnet 4.6 with thinking off, **try adaptive + `effort: \"low\"` first** rather than `thinking: {type: \"disabled\"}`.\n\nThe triggering behavior for adaptive thinking is steerable. If the model emits thinking blocks more often than wanted (which can happen with large or complex system prompts), prompt it directly — and measure the effect on quality:\n\n> *\"Thinking adds latency and should only be used when it will meaningfully improve answer quality, typically for problems that require multi-step reasoning. When in doubt, respond directly.\"*\n\nConversely, if you're running hard workloads at `medium` and seeing under-thinking, the first lever is to raise effort; if you need finer control, prompt for it directly.\n\n### Capability improvements\n\n**Coding and agentic tasks.** The largest gains over Sonnet 4.6 are in coding and agentic tasks. Claude Sonnet 5 performs well out of the box on existing Sonnet 4.6 prompts.\n\n**High-resolution vision.** Claude Sonnet 5 is the first Sonnet-tier model with high-resolution image support: maximum **2576 pixels on the long edge** (up from 1568px on Sonnet 4.6). High-res images can use up to ~3× more image tokens than on Sonnet 4.6 (4784 vs 1568 tokens per image at the limit) — if the added fidelity isn't needed, downsample before sending to control token costs. No beta header or opt-in required.\n\n**Computer use.** Supports the `computer_20251124` tool version (beta header `computer-use-2025-11-24`). Capability works across resolutions up to the 2576px / 3.75MP maximum; sending screenshots at **1080p** provides a good balance of performance and cost. For particularly cost-sensitive workloads, **720p** or **1366×768** are lower-cost options with strong performance. Test to find the ideal settings for the use case; experimenting with `effort` can also help tune behavior.\n\n### Behavioral shifts (prompt-tunable)\n\nNone of these break code, but prompts tuned for Sonnet 4.6 may land differently. Claude Sonnet 5 follows instructions closely, so small explicit directives close the gap.\n\n**Response length and verbosity.** Claude Sonnet 5 calibrates response length to task complexity rather than defaulting to a fixed verbosity — usually shorter on simple lookups, longer on open-ended analysis. If a product depends on a particular verbosity, tune the prompt. To decrease verbosity:\n\n> *\"Provide concise, focused responses. Skip non-essential context, and keep examples minimal.\"*\n\nIf you see specific kinds of verbosity (e.g. over-explaining), add targeted instructions to prevent them. Positive examples showing the desired concision tend to be more effective than telling the model what not to do.\n\n**Tool use triggering.** Claude Sonnet 5 is more agentic than Sonnet 4.6 by default and will reach for tools and run self-verification loops more readily. **With thinking disabled**, the model is less likely to reach for tools or consider searching — if the harness relies on tool calls with thinking off, add an explicit nudge in the system prompt. `effort` is also a lever: `high` and `xhigh` show substantially more tool usage in agentic search and coding. For scenarios where you want more tool use, also explicitly instruct when and how to use the tools (e.g. if web-search is under-used, describe in the prompt why and how it should be called).\n\n**User-facing progress updates.** Claude Sonnet 5 provides regular, higher-quality updates to the user throughout long agentic traces by default. If the harness has scaffolding to force interim status messages (\"After every 3 tool calls, summarize progress\"), **try removing it**. If the length or content of the updates isn't well-calibrated to the use case, describe what they should look like in the prompt and provide an example.\n\n**More literal instruction following.** Claude Sonnet 5 interprets prompts literally and explicitly, particularly at lower effort levels. It does not silently generalize an instruction from one item to another, and it does not infer requests that weren't made. The upside is precision — better for carefully tuned prompts, structured extraction, and pipelines that need predictable behavior. If an instruction should apply broadly, **state the scope explicitly** (\"Apply this formatting to every section, not just the first one\"). The same literalism means style/tone directives carried over from Sonnet 4.6 may now over-apply — re-baseline holdover lines like \"be concise\" before keeping them.\n\n**Tone and writing style.** Prose style on long-form writing may shift. If a product relies on a specific voice, re-evaluate style prompts against the new baseline. For a warmer or more conversational voice:\n\n> *\"Use a warm, collaborative tone. Acknowledge the user's framing before answering.\"*\n\nBecause `temperature`/`top_p`/`top_k` are not accepted on Claude Sonnet 5, callers who previously relied on `temperature` for stylistic variety must use system-prompt instructions instead.\n\n**Code review harnesses.** A review harness tuned for an earlier model may initially see lower recall on Claude Sonnet 5. This is likely a harness effect, not a capability regression: when a review prompt says \"only report high-severity issues\" / \"be conservative\" / \"don't nitpick,\" Claude Sonnet 5 follows that instruction more faithfully than earlier models did — it investigates just as thoroughly, identifies the bugs, and then doesn't report findings it judges below the stated bar. Precision typically rises, but measured recall can fall even though underlying bug-finding ability has improved. Recommended prompt language:\n\n> *\"Report every issue you find, including ones you are uncertain about or consider low-severity. Do not filter for importance or confidence at this stage — a separate verification step will do that. Your goal here is coverage: it is better to surface a finding that later gets filtered out than to silently drop a real bug. For each finding, include your confidence level and an estimated severity so a downstream filter can rank them.\"*\n\nThis works even without an actual second step, but moving confidence filtering out of the finding stage often helps. If you do want single-pass self-filtering, be concrete about where the bar is rather than using qualitative terms like \"important\" — e.g. \"report any bugs that could cause incorrect behavior, a test failure, or a misleading result; only omit nits like pure style or naming preferences.\" Iterate against a subset of evals to validate recall/F1 gains.\n\n**Design and frontend defaults.** Claude Sonnet 5 may settle into a consistent default visual style on open-ended frontend and design briefs. Generic instructions (\"don't use that color,\" \"make it clean and minimal\") tend to shift it to a different fixed palette rather than producing variety. Two approaches work reliably: **specify a concrete alternative** (the model follows explicit specs precisely — give the palette, typography, layout, and spacing), or **have the model propose options before building** (e.g. \"Before building, propose 4 distinct visual directions tailored to this brief — bg hex / accent hex / typeface plus a one-line rationale — ask the user to pick one, then implement only that direction\"). Because `temperature` isn't accepted on Claude Sonnet 5, the propose-then-pick approach is the recommended way to get meaningfully different design directions across runs. To steer away from generic AI-aesthetic patterns, a short directive in the system prompt also helps:\n\n> *\"NEVER use generic AI-generated aesthetics like overused font families (Inter, Roboto, Arial, system fonts), cliched color schemes (particularly purple gradients on white or dark backgrounds), predictable layouts and component patterns, and cookie-cutter design that lacks context-specific character. Use unique fonts, cohesive colors and themes, and animations for effects and micro-interactions.\"*\n\n**Interactive coding products.** Token usage and behavior can differ between autonomous, asynchronous coding agents (single user turn) and interactive, synchronous coding agents (multiple user turns). To maximize both performance and token efficiency, use `effort: \"xhigh\"` or `\"high\"`, add autonomous features like an auto mode, and reduce the number of human interactions required. Specify task, intent, and constraints upfront in the first turn — well-specified initial prompts maximize autonomy and intelligence while minimizing extra token usage after user turns; ambiguous or progressively-revealed prompts tend to reduce token efficiency and sometimes performance.\n\n### Claude Sonnet 5 Migration Checklist\n\nEvery item is tagged: **`[BLOCKS]`** items cause a 400 error or truncated output if missed; **`[TUNE]`** items are quality/cost adjustments — surface them to the user as recommendations.\n\n- [ ] **[BLOCKS]** Update the `model=` string to `claude-sonnet-5`\n- [ ] **[BLOCKS]** Replace `thinking: {type: \"enabled\", budget_tokens: N}` with `thinking: {type: \"adaptive\"}` + `output_config.effort` — the Sonnet 4.6 transitional escape hatch is gone\n- [ ] **[BLOCKS]** Strip `temperature`, `top_p`, `top_k` from request construction (use system-prompt instructions for tone/variety instead)\n- [ ] **[BLOCKS]** Bedrock only: pass `thinking: {type: \"disabled\"}` alongside forced `tool_choice` (`{type: \"tool\"}` / `{type: \"any\"}`) — not required on the Claude API or Vertex AI\n- [ ] **[BLOCKS]** At `effort: \"xhigh\"` or `\"max\"`: set a large `max_tokens` (up to 128k, unchanged from Sonnet 4.6) so the model has room for thinking and tool calls — Sonnet-4.6-tuned limits may truncate equivalent output under the new tokenizer (symptom: `stop_reason: \"max_tokens\"`)\n- [ ] **[TUNE]** Thinking-field omitted: adaptive is now the default (4.6 ran thinking-off) — either set `thinking: {type: \"disabled\"}` to preserve the old behavior, or revisit `max_tokens` for the added thinking spend\n- [ ] **[TUNE]** `thinking.display` defaults to `\"omitted\"` (4.6 defaulted to `\"summarized\"`): if you stream reasoning to users, set `thinking: {type: \"adaptive\", display: \"summarized\"}` explicitly — the default streams empty-text thinking blocks (long pause before output)\n- [ ] **[TUNE]** New tokenizer: re-run `count_tokens()` against `claude-sonnet-5` (~30% more tokens for the same text); revisit `max_tokens` and compaction triggers sized close to expected output length; re-baseline cost dashboards before reacting (per-token pricing unchanged)\n- [ ] **[TUNE]** Effort: keep the `high` default; raise to `xhigh` for the hardest coding/agentic tasks; `medium` is a cost-saving step-down (≈ Sonnet 4.6 at `high`); reserve `low` for short, latency-sensitive, non-intelligence-sensitive tasks. If shallow reasoning shows up at `low`/`medium`, raise effort rather than prompting around it\n- [ ] **[TUNE]** Thinking-off callers: try `thinking: {type: \"adaptive\"}` + `effort: \"low\"` instead of `disabled`; if `disabled` must stay, add an explicit tool-triggering nudge (the model is less tool-eager with thinking off)\n- [ ] **[TUNE]** Tool usage: more agentic than 4.6 by default (reaches for tools and self-verification more readily) — `effort` is a lever (`high`/`xhigh` for more tool use); add explicit when/how triggering instructions for under-used tools\n- [ ] **[TUNE]** Drop forced progress-update scaffolding (\"after every N tool calls, summarize\") — the default updates are higher quality; describe the desired update shape if it still needs tuning\n- [ ] **[TUNE]** Re-baseline holdover style/tone/scope directives — instructions are followed literally; state the scope explicitly when one should apply broadly\n- [ ] **[TUNE]** Verbosity-sensitive routes: tune response length via prompt (positive examples > \"don't\" instructions)\n- [ ] **[TUNE]** Code-review harnesses with conservative-reporting instructions (\"only high-severity\", \"don't nitpick\"): switch to a coverage-first prompt (report everything with confidence + severity) and filter downstream — measured recall can otherwise fall even though bug-finding improved\n- [ ] **[TUNE]** Open-ended frontend/design briefs: specify a concrete spec, or have the model propose 3–4 visual directions and pick one (the recommended substitute for `temperature`-driven variety)\n- [ ] **[TUNE]** Interactive coding products: use `effort: \"xhigh\"`/`\"high\"`, add autonomous features (e.g. auto mode), and put task/intent/constraints in the first turn\n- [ ] **[TUNE]** Vision-heavy / computer-use pipelines: leave images at native resolution up to 2576px long edge for the accuracy gain (downsample to control image-token cost if fidelity isn't needed); for computer use, 1080p screenshots are a good performance/cost balance with `computer_20251124`\n- [ ] **[TUNE]** Security workloads: add handling for safeguard refusals (cyber-capable topics may now be declined where Sonnet 4.6 answered)\n\n---\n\n## Migrating to Claude Fable 5\n\n> **Model IDs `claude-fable-5` and `claude-mythos-5` are authoritative as written here.** When the user asks to migrate to Claude Fable 5, write `model=\"claude-fable-5\"` exactly; a Mythos Preview migrator in Project Glasswing writes `model=\"claude-mythos-5\"` (everyone else: `claude-fable-5`). Do **not** WebFetch to verify — this guide is the source of truth for migration target IDs. The corresponding entries exist in `shared/models.md`.\n\nClaude Fable 5 is Anthropic's most capable widely released model — for the most demanding reasoning and long-horizon agentic work. **Claude Mythos 5** (`claude-mythos-5`) offers the same capabilities, pricing, and API behavior through Project Glasswing (participation is the only way to access it), and succeeds the invitation-only **Claude Mythos Preview** (`claude-mythos-preview`). Everything in this section applies to both models — only the ID differs. Mythos Preview migrators in Project Glasswing target `claude-mythos-5`; everyone else targets `claude-fable-5`. 1M token context window by default (the maximum is also the default), up to 128K output tokens per request.\n\n**Migrate to Claude Fable 5 only when the user explicitly chose it.** It is not the default Opus upgrade path — pricing is above Opus-tier. For \"upgrade to the latest model\" requests, the target remains `claude-opus-4-8`.\n\n### Breaking changes (vs Opus-tier and Mythos Preview)\n\n1. **Thinking is always on — remove all `thinking` configuration.** Adaptive thinking applies automatically whenever the `thinking` parameter is unset (an explicit `{type: \"adaptive\"}` is also accepted). Any other configuration is rejected: `thinking: {type: \"disabled\"}` and `{type: \"enabled\", budget_tokens: N}` both return a 400. `budget_tokens` has no replacement — the `output_config.effort` parameter is a separate output-level control, not a thinking budget.\n\n   ```python\n   # Before (Mythos Preview / older models)\n   client.messages.create(\n       model=\"claude-mythos-preview\",\n       max_tokens=16000,\n       thinking={\"type\": \"enabled\", \"budget_tokens\": 10000},\n       messages=[...],\n   )\n\n   # After (Claude Fable 5) — no thinking field at all\n   client.messages.create(\n       model=\"claude-fable-5\",\n       max_tokens=16000,\n       output_config={\"effort\": \"high\"},\n       messages=[...],\n   )\n   ```\n\n2. **Assistant prefill is not supported.** Replace last-assistant-turn prefills with structured outputs (`output_config.format`) or system prompt instructions — same replacement patterns as the 4.6-family prefill removal above. (One exception: the fallback-credit prefill claim — the server accepts the echoed assistant message when redeeming a credit; see the refusal section below.)\n\n3. **Interleaved scratchpad is not supported** (Mythos Preview migrators only). Inter-tool reasoning is returned in thinking blocks instead, which adaptive thinking produces automatically between tool calls.\n\n### Thinking output on Claude Fable 5 and Claude Mythos 5\n\nOn Claude Fable 5 and Claude Mythos 5, the raw chain of thought is never returned. What you receive are **regular `thinking` blocks**, not encrypted blobs or `redacted_thinking`: `display: \"summarized\"` returns a readable summary of the reasoning, and with `\"omitted\"` — the default, same as Opus 4.8/4.7 — responses still include `thinking` blocks but the `thinking` field is an empty string. `display` controls visibility only; thinking happens and is billed the same under every setting. When continuing a conversation on the same model, pass thinking blocks back to the API **unchanged** (the standard multi-turn pattern; dropping or editing them breaks the turn).\n\nWhen continuing on the same model, pass each thinking block back **exactly as received — including blocks whose `thinking` text is empty**. The API rejects blocks whose content has been *modified*, not blocks you have read; displaying the summary is fine, editing or reconstructing blocks is not.\n\nRegular thinking blocks aren't origin-locked — they replay across models fine (the server renders them into the target model's prompt). Claude Fable 5/Claude Mythos 5 thinking is the exception: a thinking block from these models replayed to a different model is **dropped from the prompt** rather than rendered — typically silently (early-access builds hard-rejected with `invalid_request_error`; that broke workflows and was reverted before launch, but the new behavior is still rolling out, so don't build logic that depends on either outcome). The drop happens before the prompt is priced, so a dropped block **lowers `usage.input_tokens`** — you aren't billed for it, and there's nothing to strip for cost. Don't strip *regular* thinking blocks either: removing them can trigger ordering/signature 400s. Two rules for replay bodies stand regardless: fallback-credit retries must echo the refused body **unchanged**, and `fallback` blocks from a mid-output fallback stay where they appeared.\n\nRelated: a request that tries to elicit the model's internal reasoning *in the response text* can be refused with `stop_details.category: \"reasoning_extraction\"` — applications needing reasoning visibility should read the summarized `thinking` blocks instead of prompting for reasoning.\n\n### Tokenizer — unchanged from Opus 4.8\n\nClaude Fable 5 uses the **same tokenizer as Claude Opus 4.8** (the tokenizer introduced with Opus 4.7). Token counts are roughly unchanged when migrating from Opus 4.7/4.8 or from `claude-mythos-preview`; per-token pricing differs.\n\n- Coming **from Opus 4.7/4.8 or `claude-mythos-preview`**: token counts are roughly unchanged. Re-baseline cost and latency on your own workloads for the per-token price difference.\n- Coming **from Opus 4.6, Sonnet, Haiku, or older**: the Opus 4.7 tokenizer tokenizes the same content to roughly 1×–1.35× as many tokens (varies by content and workload shape). Do not reuse token counts, context-window budgets, or `max_tokens` settings measured on the old model; re-baseline with `count_tokens`.\n\nTo measure the difference on your own prompts, call `count_tokens` once with your current model and once with `model: \"claude-fable-5\"`, and compare the two `input_tokens` values.\n\n### `refusal` stop reason — handle before reading content\n\nClaude Fable 5 runs safety classifiers on incoming requests, targeting research biology and most cybersecurity content (Claude Fable 5 is not intended for those domains); benign adjacent work — security tooling, life-sciences tasks — can occasionally trigger false positives, which is why the fallback patterns below matter even for legitimate workloads. (Most Claude consumer surfaces ship with built-in Opus 4.8 fallbacks; API callers configure their own.) A declined request returns a **successful HTTP 200** with `stop_reason: \"refusal\"`, plus a `stop_details` object with the policy category (values such as `\"cyber\"`, `\"bio\"`, `\"reasoning_extraction\"`, `\"frontier_llm\"`, or `null` — treat `null` as a permanent valid state; see the refusal category table in the public docs for the full set). **Branch on `stop_reason`, never on `stop_details`** — `stop_details` is informational and can be `null` even on a refusal, and `explanation` is not guaranteed present. Note that classifier blocks and ordinary model refusals (the model itself declining) both surface as `stop_reason: \"refusal\"`; `stop_details.category` tells you which class you're handling, and therefore whether retrying on a fallback model is the right response. The classifier can fire **before any output** (empty `content` array; not billed at all — no input or output tokens, no rate-limit consumption) or **mid-stream** after partial output (already-streamed output is billed at normal rates — discard the partial output rather than treating it as complete). Code that reads `response.content[0]` unconditionally will break — check `stop_reason` first:\n\n```python\nresponse = client.messages.create(model=\"claude-fable-5\", max_tokens=1024, messages=[...])\nif response.stop_reason == \"refusal\":\n    # classifiers declined; content is empty (pre-output) or partial (mid-stream)\n    handle_refusal()\nelse:\n    print(response.content[0].text)\n```\n\n**Default to opting in.** Fallbacks are not automatic on the API — a request without them simply stops on a refusal. Migrated and new Claude Fable 5 code should ship with pattern 1 below (pattern 2 on providers without server-side support) from day one, not as a later hardening step: emit the opt-in in the code, tell the user it's there, and remove it only if they decline.\n\nThree ways to retry a refused request on another model, in order of preference:\n\n**1. Server-side `fallbacks` parameter (beta: Claude API and Claude Platform on AWS) — preferred.** One round trip, a plain client, no client-side logic. Name substitute models (the only supported fallback target at launch is `claude-opus-4-8`, expansion expected); on a policy decline the API runs the next model on the same request and returns its answer, with credit-style repricing applied automatically. A `stop_reason: \"refusal\"` on the final response means the whole chain refused.\n\n```python\nresponse = client.beta.messages.create(\n    model=\"claude-fable-5\",\n    max_tokens=1024,\n    betas=[\"server-side-fallback-2026-06-01\"],\n    fallbacks=[{\"model\": \"claude-opus-4-8\"}],\n    messages=[{\"role\": \"user\", \"content\": \"Hello, Claude\"}],\n)\n\n# Switch points: one fallback block per model that ran and declined this turn\nfor block in response.content:\n    if block.type == \"fallback\":\n        print(f\"{block.from_.model} declined; {block.to.model} continued\")\n\n# Served-by signal: a fallback_message in usage.iterations means a fallback model\n# ran; pair it with stop_reason to confirm the fallback served the response\n# (a fallback model can also refuse). Covers sticky turns too.\nfallback_ran = any(\n    entry.type == \"fallback_message\" for entry in response.usage.iterations or []\n)\nif fallback_ran and response.stop_reason != \"refusal\":\n    print(f\"Served by {response.model}\")\n```\n\nKey semantics:\n\n- **Header must be exactly `server-side-fallback-2026-06-01`** — other `server-side-fallback-*` values reject the `fallbacks` param with a 400. The current header carries the *earliest* date of the series (`-2026-06-09` and `-2026-06-02` were earlier previews) — do not \"correct\" it to a newer-looking date. Rejected on the Batches API; not available on Amazon Bedrock, Vertex AI, or Microsoft Foundry (use pattern 2 there — the SDK middleware). Entries may override `max_tokens` per hop (bounding that attempt's own output independently of the top-level `max_tokens`); `thinking`, `output_config`, and `speed` overrides are rolling out (`speed` additionally requires its beta) — until your requests accept them, include only `model` and `max_tokens` in each entry. Entries must be distinct and must be in the requested model's `allowed_fallback_models` (published on `/v1/models` when the `server-side-fallback-2026-06-01` beta header is set — not yet visible under the `fallback-credit-*` header alone, and not exposed on Amazon Bedrock, Vertex AI, or Microsoft Foundry). The request *with an entry's overrides merged in* must be valid as a direct request to that entry's model.\n- **Triggers on policy declines only** — rate limits, overloads, and server errors on the requested model are returned as-is, never falling back.\n- **Reading the response:** a `fallback` content block (`{\"type\": \"fallback\", \"from\": {\"model\": ...}, \"to\": {\"model\": ...}}`) marks each switch point in `content`; the served-by signal is a `fallback_message` entry in `usage.iterations` (don't rely on the block — sticky-served turns have none). Top-level `model` names the model that produced the message.\n- **Billing:** `usage.iterations` is the per-attempt source of truth; top-level `usage` covers only the attempt that produced the returned message. Declined-before-output attempts are reported but not billed; fallback attempts bill at the fallback model's rates. Each attempt claims the rate limits of the model that ran it — if the fallback model is rate-limited or overloaded, the fallback attempt is not made and the preceding refusal is returned instead with `stop_details.recommended_model` naming a model to retry directly (the recommendation is a hint, not a guarantee, and is `null` when no recommendation is available) — size fallback-model limits for expected refusal volume.\n- **Sticky routing:** once a conversation falls back, later non-streaming requests with `fallbacks` are served directly by the fallback model for ~1 hour (best-effort; org-scoped content-hash record, not message content; not recorded for ZDR orgs). Handle the requested model being tried again at any time.\n- **Echoing fallback turns back:** after a mid-output fallback, omit `thinking`, `redacted_thinking`, and `tool_use` blocks — plus any `server_tool_use` block without its matching `server_tool_result`, and any other unrecognized model-internal block type — that appear *before* the final `fallback` block; text blocks, paired server-tool blocks, and everything after the boundary echo normally. The `fallback` block itself is an ignored audit marker (keep or drop). Streaming: the retry happens on the same stream and already-received content is never invalidated — a pre-output block is seamless (`message_start` names the fallback model; the `fallback` block arrives as an ordinary `content_block_start`, first in `content` — there is no special SSE event type; note `message_start` arrives only after the declined attempt, so time-to-first-byte includes it), and a mid-stream block keeps the partial, marks the boundary with the block, and continues — only the partial's `text` blocks are passed to the fallback model as continuation context (other block types stay in `content` but aren't part of it). Sticky routing is **not consulted on streaming requests** in the initial release, so on streams the `fallback` block check is the complete signal; non-streaming mid-output declines omit the declined partial entirely.\n\n**2. SDK client-side middleware — for providers without server-side fallbacks (Amazon Bedrock, Vertex AI, Microsoft Foundry).** Register it on the client and every `client.beta.messages` request (streaming included) retries refusals automatically, splicing the fallback model's events onto the open stream in the same wire shape as pattern 1 (a `fallback` content block at each boundary, per-hop `usage.iterations`). It is also a beta surface: the middleware sends the `fallback-credit-2026-06-01` header by default so retries are repriced via credit tokens (override with its `betas` option). `BetaFallbackState` pins follow-up turns to the model that accepted (the client-side analog of sticky routing) — reuse one state object per conversation:\n\n```python\nfrom anthropic import Anthropic, BetaFallbackState, BetaRefusalFallbackMiddleware\n\nclient = Anthropic(middleware=[BetaRefusalFallbackMiddleware([{\"model\": \"claude-opus-4-8\"}])])\nstate = BetaFallbackState()  # pins follow-ups to the model that accepted\nwith state:\n    response = client.beta.messages.create(model=\"claude-fable-5\", max_tokens=1024, messages=messages)\n```\n\nCreate **one state per conversation** — it is the pinning scope; sharing one across conversations pins unrelated threads together, and a conversation without a state is never pinned. Per-language naming (from the GA SDK examples — don't improvise):\n\n- **TypeScript**: `betaRefusalFallbackMiddleware([...])` in the client's `middleware` array; pass `{ fallbackState: state }` (a `BetaFallbackState`) as a request option.\n- **Go**: `option.WithMiddleware(betafallback.BetaRefusalFallbackMiddleware([]anthropic.BetaFallbackParam{{Model: ...}}))` (package `lib/betafallback`); state via `betafallback.WithBetaFallbackState(&betafallback.BetaFallbackState{})` passed as a request option. Server-side equivalents: `Fallbacks: []anthropic.BetaFallbackParam{...}` + `anthropic.AnthropicBetaServerSideFallback2026_06_01`.\n- **C#**: it's a *handler* — `new AnthropicClient { Handlers = [new BetaRefusalFallbackHandler { Fallbacks = [new(Model.ClaudeOpus4_8)] }] }` (namespace `Anthropic.Helpers`); state via `BetaFallbackState.Create()` scoped per call with `using (fallbackState.Use()) { ... }`. Server-side equivalents: `Fallbacks = [new(Model.ClaudeOpus4_8)]` + `AnthropicBeta.ServerSideFallback2026_06_01`.\n\nFor languages not listed (Java, Ruby, PHP) — or for a full runnable program in any language — each public SDK repo ships a fallbacks example under `examples/` (e.g. `examples/fallbacks.py`, `examples/refusal-fallback/`): WebFetch the repo from `shared/live-sources.md` § SDK Repositories rather than improvising the binding.\n\n**3. Hand-rolled retry + fallback credit (raw HTTP, or SDKs without the middleware).** Detect the refusal via `stop_reason` and re-send the conversation as-is on a model with broader availability such as `claude-opus-4-8` (Claude Fable 5's thinking blocks are silently ignored by other models — no stripping required); keep using the fallback model for subsequent turns. **Fallback credit** (beta: Claude API, Claude Platform on AWS, Amazon Bedrock, Vertex AI, and Microsoft Foundry) makes those retries cheaper. Prompt caches are per-model, so a plain retry pays cold cache-writes on the new model. With the `fallback-credit-2026-06-01` beta header (send it on both the original request and the retry), a refusal's `stop_details` carries `fallback_credit_token` (opaque; `null` when unavailable) and `fallback_has_prefill_claim`. Echo the token as the top-level `fallback_credit_token` request parameter on the retry (typed in the GA SDKs; on a pre-GA SDK pass it via `extra_body`) and the previously-cached span bills at cache-read rates — the retry costs what it would have if the conversation had been on that model all along. Rules: the retry body must match the refused request **exactly** in every prompt-shaping field (`system`, `messages`, `tools`, `tool_choice`, `thinking` — do **not** strip thinking blocks when redeeming a credit — the server handles them); the retry model must be in the refused model's `allowed_fallback_models`; the token expires in 5 minutes; Batches results carry no tokens. If `fallback_has_prefill_claim` is `true`, append one assistant message echoing the refused response's `content` — the retry model continues from where the refused model stopped (and completed server-tool work isn't re-run). When echoing, strip trailing whitespace from a final `text` block (the prefill validator rejects it; the credit match tolerates that edit), after omitting any unpaired `tool_use` blocks. On a 400, fall back to the unchanged body with the token; on a 400 naming `fallback_credit_token`, retry without it (credit forfeited).\n\n**Migrating code built on the v1 preview.** If the code you're editing carries any of these markers, it targets the discontinued early-access surface — migrate it to the v2 shapes above, and ship the header and parameter changes together (the v1 parameter shape under the v2 header is a 400):\n\n| v1 marker (replace) | v2 |\n|---|---|\n| `server-side-fallback-2026-06-09` / `-2026-06-02` header | `server-side-fallback-2026-06-01` |\n| `fallback: {model, on_partial}` single object | `fallbacks: [{model, ...}]` array (1–3); `on_partial` no longer exists — partial-output behavior is fixed (streams keep the partial; non-streaming omits it). Unknown keys in an entry are a 400 |\n| Top-level `response.fallback` object (`from_model`, `reason`) | Never emitted — read `fallback` content blocks (switch points, no `reason` field) and `usage.iterations` (served-by) |\n| `event: fallback` SSE with discard indices | No dedicated event; streamed content is never invalidated — the switch arrives as an ordinary `content_block_start`/`stop` pair of type `fallback` |\n| `fallback_primary` / `fallback_retry` iteration types | Blocked attempts are plain `message` entries; the serving attempt is `fallback_message` |\n| `reason: \"sticky\"` | No reason field — sticky turns carry no block; detect via `fallback_message` in `usage.iterations` + `response.model` |\n| `recommended_model` meaning \"primary served the refusal\" | Now populated only when the fallback attempt *couldn't run* (rate-limited/overloaded) — its presence means a direct retry on that model may succeed, not that it refused too |\n\n### Data retention requirement\n\nClaude Fable 5 requires **30-day data retention** and is not available under zero data retention. Requests from an organization whose data-retention configuration doesn't meet the requirement return `400 invalid_request_error` — if a migration suddenly 400s with no obvious request problem, check the org's retention configuration before debugging the payload. On Amazon Bedrock, Google Vertex AI, and Microsoft Foundry, data-retention requirements are set by each platform.\n\n### What carries over unchanged\n\nSame Messages API and tool-use patterns as Opus-tier and Mythos Preview. Supported at launch: `output_config.effort` (`low`/`medium`/`high`/`xhigh`/`max`), Task Budgets (beta, `task-budgets-2026-03-13` header), compaction (beta, `compact-2026-01-12` header), the memory tool, tool-call clearing via context editing, and high-resolution vision (no downscaling cap, as on Opus 4.7+).\n\n### Behavioral shifts (prompt-tunable)\n\nNone of these are API-breaking, but they're where migrated workloads feel different. Claude Fable 5's biggest gains are on work *above* what prior models could do (long-horizon autonomous runs, first-shot implementations of well-specified systems, end-to-end enterprise deliverables — financial analysis, spreadsheets, slides, docs — code review/debugging and repository-history search, vision on dense or degraded images — it's explicitly trained to use bash and crop tools on flipped/blurry/noisy inputs — navigating ambiguity, parallel sub-agent delegation and collaboration — it reliably sustains ongoing communications with long-running sub-agents and peer agents; note bug-finding gains exclude security-focused analysis, where the cyber classifiers apply) — don't evaluate it only on workloads older models already handled.\n\n**Longer turns by default — the biggest structural shift.** Individual requests on hard tasks can run many minutes at higher effort (a 15-minute single request is normal when the task involves gathering context, building, and self-verifying). Before migrating, plan timeouts, streaming, and user-facing progress indicators; structure work so callers check in on runs asynchronously rather than blocking inside one request. On ambiguous tasks Claude Fable 5 may need a small nudge to avoid overplanning:\n\n> When you have enough information to act, act. Do not re-derive facts already established in the conversation, re-litigate a decision the user has already made, or narrate options you will not pursue in user-facing messages. If you are weighing a choice, give a recommendation, not an exhaustive survey. This does not apply to thinking blocks.\n\n**Consider all effort levels.** `output_config.effort` is the primary intelligence/latency/cost control. Recommended defaults: `high` for most tasks, `xhigh` for the most capability-sensitive workloads, `medium`/`low` for routine work. Lower effort settings — including `low` — still perform very well on Claude Fable 5, often exceeding the `xhigh` or even `max` performance of previous models. Reduce effort if a task completes correctly but takes longer than necessary, or for a quicker interactive working style. At higher effort on routine work, Claude Fable 5 can gather context and deliberate beyond what the task needs (the flip side: higher effort buys excellent verification behavior and the most rigorous outputs). To prevent unrequested tidying or refactoring at higher effort:\n\n> Don't add features, refactor, or introduce abstractions beyond what the task requires. A bug fix doesn't need surrounding cleanup and a one-shot operation usually doesn't need a helper. Don't design for hypothetical future requirements - do the simplest thing that works well. Avoid premature abstraction. Avoid half-finished implementations either. Don't add error handling, fallbacks, or validation for scenarios that cannot happen. Trust internal code and framework guarantees. Only validate at system boundaries (user input, external APIs). Don't use feature flags or backwards-compatibility shims when you can just change the code.\n\n**Instruction following is strong — use it.** Claude Fable 5 is very responsive to explicit communication-style sections in system prompts; invest in them rather than fighting output style downstream. Un-steered — especially at higher effort — it can elaborate beyond what the task needs: heavily-structured PR descriptions, sections on alternatives that weren't chosen, comments narrating what the next line does. You don't need to enumerate these behaviors by name; a brief instruction is just as effective:\n\n> Lead with the outcome. Your first sentence after finishing should answer \"what happened\" or \"what did you find\" — the thing the user would ask for if they said \"just give me the TLDR.\" Supporting detail and reasoning come after. Being readable and being concise are different things, and readability matters more. The way to keep output short is to be selective about what you include (drop details that don't change what the reader would do next), not to compress the writing into fragments, abbreviations, arrow chains like A → B → fails, or jargon.\n\n**Ground progress claims on long runs.** Require progress claims to be audited against tool results — in testing this nearly eliminated fabricated status reports on tasks designed to elicit them:\n\n> Before reporting progress, audit each claim against a tool result from this session. Only report work you can point to evidence for; if something is not yet verified, say so explicitly. Report outcomes faithfully: if tests fail, say so with the output; if a step was skipped, say that; when something is done and verified, state it plainly without hedging.\n\n**State boundaries explicitly.** Claude Fable 5 sometimes takes unrequested-but-adjacent actions (e.g. composing an email straight to drafts, creating backup git branches). Define what it should *not* do:\n\n> When the user is describing a problem, asking a question, or thinking out loud rather than requesting a change, the deliverable is your assessment. Report your findings and stop. Don't apply a fix until they ask for one. Before running a command that changes system state — restarts, deletes, config edits — check that the evidence actually supports that specific action. A signal that pattern-matches to a known failure may have a different cause.\n\n**Let it delegate — asynchronously.** Parallel sub-agents are dependable on Claude Fable 5 — instead of suppressing delegation (a common prior-model guardrail), use sub-agents frequently and give explicit guidance on *when* delegation is desirable. Sub-agents that communicate **asynchronously** with the orchestrator outperform spawn-and-block: long-lived agents keep their context instead of re-establishing it per subtask (cache-read savings), the orchestrator isn't bottlenecked on the slowest sub-agent, and context persists across subtasks.\n\n> Delegate independent subtasks to sub-agents and keep working while they run. Intervene if a sub-agent goes off track or is missing relevant context.\n\n**Give it a memory surface.** Claude Fable 5 performs notably better when it can write learnings somewhere for future reference — even a plain `.md` file. Tell it where, tell it to consult that file in future sessions, and give it a format:\n\n> Store one lesson per file with a one-line summary at the top. Record corrections and confirmed approaches alike, including why they mattered. Don't save what the repo or chat history already records; update an existing note rather than creating a duplicate; delete notes that turn out to be wrong.\n\n**Rare: early stopping.** Deep into long sessions it can occasionally end a turn with a text-only statement of intent (\"I'll now run X\") without the tool call, or ask permission it doesn't need. A \"continue\" recovers it interactively; for autonomous pipelines add a system reminder:\n\n> You are operating autonomously. The user is not watching in real time and cannot answer questions mid-task, so asking 'Want me to…?' or 'Shall I…?' will block the work. For reversible actions that follow from the original request, proceed without asking. Offering follow-ups after the task is done is fine; asking permission after already discussing with the user before doing the work is not. Before ending your turn, check your last paragraph. If it is a plan, an analysis, a question, a list of next steps, or a promise about work you have not done ('I'll…', 'let me know when…'), do that work now with tool calls. End your turn only when the task is complete or you are blocked on input only the user can provide.\n\n**Rare: context anxiety.** In very long sessions it can worry about running out of context — suggesting a new session or trimming its own work — most often when the harness surfaces a remaining-token countdown. Avoid showing explicit context-budget counts; if you must:\n\n> You have ample context remaining. Do not stop, summarize, or suggest a new session on account of context limits – continue the work.\n\n**Give the reason, not just the request.** Claude Fable 5 performs better when it understands the intent behind a request — it connects the task to relevant information rather than inferring intent on its own. This matters most for long-running agents juggling context from disparate workstreams:\n\n> I'm working on [the larger task] for [who it's for]. They need [what the output enables]. With that in mind: [request].\n\n**Readability in long agentic sessions.** Deep into extended conversations (many tool calls, large working context) Claude Fable 5 can produce text users find hard to follow — dense arrow-chain shorthand, implementation-level detail, references to thinking the user never saw. A communication-style addendum strongly mitigates this; adapt:\n\n> Terse shorthand is fine between tool calls (that's you thinking out loud, and brevity there is good). Your final summary is different: it's for a reader who didn't see any of that. If you've been working for a while without the user watching - overnight, across many tool calls, since they last spoke - your final message is their first look at any of it. Write it as a re-grounding, not a continuation of your working thread: the outcome first, then the one or two things you need from them, each explained as if new. The vocabulary you built up while working is yours, not theirs; leave it behind unless you re-introduce it. When you write the summary at the end, drop the working shorthand. Write complete sentences. Spell out terms instead of abbreviating them. Don't use arrow chains, hyphen-stacked compounds, or labels you made up earlier — the reader doesn't have the context to decode them. When you mention files, commits, flags, or other identifiers, give each one its own plain-language clause saying what it is or what changed — never pack several into one parenthesized run or slash-separated list. Open with the outcome: one sentence on what happened or what you found. Then the supporting detail. If you have to choose between short and clear, choose clear.\n\n### Long-running agent recommendations\n\n- **Make self-verification explicit.** For long-running builds, instruct it to establish and run its own checking harness on a cadence (\"Establish a method for checking your own work as you build; run it every [interval], verifying against the specification with sub-agents\"). Separate fresh-context verifier sub-agents tend to outperform self-critique.\n- **De-prescribe migrated prompts and skills.** Prompts and skills written for prior models are often too prescriptive for Claude Fable 5 and *reduce* output quality. After migrating, A/B the workload with older step-by-step scaffolding removed — prefer stating the goal and constraints over enumerating the steps. Claude Fable 5 is also good at updating skills on the fly from what it learns mid-task — let it.\n- **Start at the top of your difficulty range.** The teams with the best early-access outcomes gave it their hardest unsolved problems first — have it scope the problem, ask questions, then execute.\n- **Add a `send_to_user` tool for verbatim mid-task delivery.** When an asynchronous agent must deliver something the user sees *exactly as written* mid-run (a deliverable, a progress update with specific numbers, a direct answer), give it a client-side tool whose input you render directly in the UI — tool inputs are never summarized, so content arrives intact. Return a simple acknowledgement as the tool result:\n\n```json\n{\n  \"name\": \"send_to_user\",\n  \"description\": \"Display a message directly to the user. Use this for progress updates, partial results, or content the user must see exactly as written before the task finishes.\",\n  \"input_schema\": {\n    \"type\": \"object\",\n    \"properties\": {\n      \"message\": { \"type\": \"string\", \"description\": \"The content to display to the user.\" }\n    },\n    \"required\": [\"message\"]\n  }\n}\n```\n\nFor agents that only narrate routine progress, the model's default progress narration is typically adequate without this tool.\n\n### Claude Fable 5 Migration Checklist\n\n- [ ] **[BLOCKS]** Update the `model=` string to `claude-fable-5` (`claude-mythos-5` for Mythos Preview migrators in Project Glasswing)\n- [ ] **[BLOCKS]** Remove `thinking: {type: \"disabled\"}` (errors on Claude Fable 5)\n- [ ] **[BLOCKS]** Replace assistant prefill with structured outputs or system prompt instructions\n- [ ] **[BLOCKS]** Confirm the org meets the 30-day data-retention requirement (ZDR orgs get `400 invalid_request_error` on every request)\n- [ ] **[BLOCKS]** Remove all other `thinking` configuration (`{type: \"enabled\", budget_tokens: N}` returns a 400, same as on Opus 4.7/4.8); control depth with `output_config.effort` instead\n- [ ] **[BLOCKS]** If thinking content is surfaced to users or stored in logs: add `thinking: {type: \"adaptive\", display: \"summarized\"}` (the default is `\"omitted\"` — otherwise the rendered text is empty)\n- [ ] **[TUNE]** Re-baseline cost and latency on your own workloads — token counts are roughly unchanged from Opus 4.7/4.8 and Mythos Preview (same tokenizer); per-token pricing differs. Coming from Opus 4.6, Sonnet, Haiku, or older, token counts differ — use `count_tokens` with each model to compare\n- [ ] **[TUNE]** Add `stop_reason == \"refusal\"` handling before reading `response.content` (pre-output: empty + unbilled; mid-stream: partial output billed — discard); opt into a fallback by default — server-side `fallbacks` (`server-side-fallback-2026-06-01`, Claude API and Claude Platform on AWS) where available, otherwise the SDK middleware or fallback credit (`fallback-credit-2026-06-01`, exact body); a bare client-side replay (history as-is; other models drop Fable's thinking blocks) is the floor, not the recommendation\n- [ ] **[TUNE]** If you surfaced thinking text to users, plan for the thinking output change — the raw chain of thought is never returned; render the `display: \"summarized\"` summary (per the [BLOCKS] item above); pass blocks back unchanged on the same model; other models drop them from the prompt (unbilled)\n- [ ] **[TUNE]** Plan for minutes-long turns: timeouts, streaming, async check-ins, progress UX (see Behavior changes above)\n- [ ] **[TUNE]** Run an effort sweep including low/medium for routine workloads; add the no-tidying instruction if higher effort produces unrequested refactors\n- [ ] **[TUNE]** A/B with prior-model scaffolding removed — over-prescriptive prompts/skills reduce Claude Fable 5 output quality\n\n---\n\n## Verify the Migration\n\nAfter updating, spot-check that the new model is actually being used. Replace `YOUR_TARGET_MODEL` with the model string you migrated to (e.g. `claude-fable-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-sonnet-5`, `claude-sonnet-4-6`, `claude-haiku-4-5`) and keep the assertion prefix in sync:\n\n```python\nYOUR_TARGET_MODEL = \"claude-opus-4-8\"  # or \"claude-opus-4-7\", \"claude-sonnet-5\", \"claude-sonnet-4-6\", \"claude-haiku-4-5\"\nresponse = client.messages.create(model=YOUR_TARGET_MODEL, max_tokens=64, messages=[...])\nassert response.model.startswith(YOUR_TARGET_MODEL), response.model\n```\n\nFor rate-limit headroom changes, pricing, or capability deltas (vision, structured outputs, effort support), query the Models API:\n\n```python\nm = client.models.retrieve(YOUR_TARGET_MODEL)\nm.max_input_tokens, m.max_tokens\nm.capabilities[\"effort\"][\"max\"][\"supported\"]\n```\n\nSee `shared/models.md` for the full capability lookup pattern.\n</doc>\n\n<doc path=\"shared/models.md\">\n# Claude Model Catalog\n\n**Only use exact model IDs listed in this file.** Never guess or construct model IDs — incorrect IDs will cause API errors. Use aliases wherever available. For the latest information, WebFetch the Models Overview URL in `shared/live-sources.md`, or query the Models API directly (see Programmatic Model Discovery below).\n\n## Programmatic Model Discovery\n\nFor **live** capability data — context window, max output tokens, feature support (thinking, vision, effort, structured outputs, etc.) — query the Models API instead of relying on the cached tables below. Use this when the user asks \"what's the context window for X\", \"does model X support vision/thinking/effort\", \"which models support feature Y\", or wants to select a model by capability at runtime.\n\n```python\nm = client.models.retrieve(\"claude-opus-4-8\")\nm.id                 # \"claude-opus-4-8\"\nm.display_name       # \"Claude Opus 4.8\"\nm.max_input_tokens   # context window (int)\nm.max_tokens         # max output tokens (int)\n\n# capabilities is an untyped nested dict — bracket access, check [\"supported\"] at the leaf\ncaps = m.capabilities\ncaps[\"image_input\"][\"supported\"]                       # vision\ncaps[\"thinking\"][\"types\"][\"adaptive\"][\"supported\"]     # adaptive thinking\ncaps[\"effort\"][\"max\"][\"supported\"]                     # effort: max (also low/medium/high)\ncaps[\"structured_outputs\"][\"supported\"]\ncaps[\"context_management\"][\"compact_20260112\"][\"supported\"]\n\n# filter across all models — iterate the page object directly (auto-paginates); do NOT use .data\n[m for m in client.models.list()\n if m.capabilities[\"thinking\"][\"types\"][\"adaptive\"][\"supported\"]\n and m.max_input_tokens >= 200_000]\n```\n\nTop-level fields (`id`, `display_name`, `max_input_tokens`, `max_tokens`) are typed attributes. `capabilities` is a dict — use bracket access, not attribute access. The API returns the full capability tree for every model with `supported: true/false` at each leaf, so bracket chains are safe without `.get()` guards. TypeScript SDK: same method names, also auto-paginates on iteration.\n\n### Raw HTTP\n\n```bash\ncurl https://api.anthropic.com/v1/models/claude-opus-4-8 \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" \\\n  -H \"anthropic-version: 2023-06-01\"\n```\n\n```json\n{\n  \"id\": \"claude-opus-4-8\",\n  \"display_name\": \"Claude Opus 4.8\",\n  \"max_input_tokens\": 1000000,\n  \"max_tokens\": 128000,\n  \"capabilities\": {\n    \"image_input\": {\"supported\": true},\n    \"structured_outputs\": {\"supported\": true},\n    \"thinking\": {\"supported\": true, \"types\": {\"enabled\": {\"supported\": false}, \"adaptive\": {\"supported\": true}}},\n    \"effort\": {\"supported\": true, \"low\": {\"supported\": true}, …, \"max\": {\"supported\": true}},\n    …\n  }\n}\n```\n\n## Current Models (recommended)\n\n| Friendly Name     | Alias (use this)    | Full ID                       | Context        | Max Output | Status |\n|-------------------|---------------------|-------------------------------|----------------|------------|--------|\n| Claude Fable 5    | `claude-fable-5`      | —                             | 1M             | 128K       | Active |\n| Claude Mythos 5   | `claude-mythos-5`     | —                             | 1M             | 128K       | Active (Project Glasswing only) |\n| Claude Opus 4.8   | `claude-opus-4-8`   | —                             | 1M             | 128K       | Active |\n| Claude Opus 4.7   | `claude-opus-4-7`   | —                             | 1M             | 128K       | Active |\n| Claude Opus 4.6   | `claude-opus-4-6`   | —                             | 1M             | 128K       | Active |\n| Claude Sonnet 5 | `claude-sonnet-5` | —                         | 1M             | 128K       | Active |\n| Claude Sonnet 4.6 | `claude-sonnet-4-6` | -                             | 1M             | 128K       | Active |\n| Claude Haiku 4.5  | `claude-haiku-4-5`  | `claude-haiku-4-5-20251001`   | 200K           | 64K        | Active |\n\n### Model Descriptions\n- **Claude Fable 5** — Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work. Same API surface as Opus 4.7/4.8 with one new breaking change: an explicit `thinking: {type: \"disabled\"}` returns a 400 — omit the `thinking` parameter instead (thinking is always on; the raw chain of thought is never returned — summaries via `display: \"summarized\"`). Same tokenizer as Opus 4.8 (token counts roughly unchanged vs Opus 4.7/4.8). Safety classifiers may return `stop_reason: \"refusal\"`. No assistant prefill. Requires 30-day data retention (not available under ZDR). $10/$50 per MTok; 1M context window (default), 128K max output. See `shared/model-migration.md` → Migrating to Claude Fable 5.\n- **Claude Mythos 5** — Same capabilities, pricing, limits, and API behavior as Claude Fable 5; only the model ID differs. Available exclusively through Project Glasswing, where it joins (and succeeds) the invitation-only Claude Mythos Preview (`claude-mythos-preview`). Use it only when the org participates in Project Glasswing; otherwise use claude-fable-5.\n- **Claude Opus 4.8** — The most capable Opus-tier model — highly autonomous, state-of-the-art on long-horizon agentic work, knowledge work, and memory; clearer, warmer writing. Same API surface as Opus 4.7 (adaptive thinking only; sampling parameters and `budget_tokens` removed). 1M context window at standard API pricing (no long-context premium). See `shared/model-migration.md` → Migrating to Opus 4.8 — a 4.7 → 4.8 move is a model-ID swap plus prompt re-tuning, no new breaking changes.\n- **Claude Opus 4.7** — Previous-generation Opus. Highly autonomous; strong on long-horizon agentic work, knowledge work, vision, and memory. Adaptive thinking only; sampling parameters and `budget_tokens` removed. 1M context window. See `shared/model-migration.md` → Migrating to Opus 4.7.\n- **Claude Opus 4.6** — Older Opus. Supports adaptive thinking (recommended), 128K max output tokens (requires streaming for large outputs). 1M context window.\n- **Claude Sonnet 5** — The best combination of speed and intelligence in the Sonnet tier; near-Opus quality on coding and agentic work. Adaptive thinking on by default (omitting `thinking` runs adaptive); manual `budget_tokens` removed; non-default sampling parameters rejected. `effort` supports `low`/`medium`/`high`/`xhigh`/`max`. New tokenizer (~30% more tokens for the same text vs Sonnet 4.6). High-resolution vision (2576px). 1M context window, 128K max output. See `shared/model-migration.md` → Migrating to Claude Sonnet 5.\n- **Claude Sonnet 4.6** — Previous-generation Sonnet. Supports adaptive thinking (recommended). 1M context window. 128K max output tokens.\n- **Claude Haiku 4.5** — Fastest and most cost-effective model for simple tasks.\n\n## Legacy Models (still active)\n\n| Friendly Name     | Alias (use this)    | Full ID                       | Status |\n|-------------------|---------------------|-------------------------------|--------|\n| Claude Opus 4.5   | `claude-opus-4-5`   | `claude-opus-4-5-20251101`    | Active |\n| Claude Opus 4.1   | `claude-opus-4-1`   | `claude-opus-4-1-20250805`    | Deprecated (retires 2026-08-05 — migrate to `claude-opus-4-8`) |\n| Claude Sonnet 4.5 | `claude-sonnet-4-5` | `claude-sonnet-4-5-20250929`  | Active |\n\n## Deprecated Models (retiring soon)\n\n| Friendly Name     | Alias (use this)    | Full ID                       | Status     | Retires      |\n|-------------------|---------------------|-------------------------------|------------|--------------|\n| Claude Sonnet 4   | `claude-sonnet-4-0` | `claude-sonnet-4-20250514`    | Deprecated | TBD          |\n| Claude Opus 4     | `claude-opus-4-0`   | `claude-opus-4-20250514`      | Deprecated | TBD          |\n| Claude Haiku 3    | —                   | `claude-3-haiku-20240307`     | Deprecated | Apr 19, 2026 |\n\n## Retired Models (no longer available)\n\n| Friendly Name     | Full ID                       | Retired     |\n|-------------------|-------------------------------|-------------|\n| Claude Sonnet 3.7 | `claude-3-7-sonnet-20250219`  | Feb 19, 2026 |\n| Claude Haiku 3.5  | `claude-3-5-haiku-20241022`   | Feb 19, 2026 |\n| Claude Opus 3     | `claude-3-opus-20240229`      | Jan 5, 2026 |\n| Claude Sonnet 3.5 | `claude-3-5-sonnet-20241022`  | Oct 28, 2025 |\n| Claude Sonnet 3.5 | `claude-3-5-sonnet-20240620`  | Oct 28, 2025 |\n| Claude Sonnet 3   | `claude-3-sonnet-20240229`    | Jul 21, 2025 |\n| Claude 2.1        | `claude-2.1`                  | Jul 21, 2025 |\n| Claude 2.0        | `claude-2.0`                  | Jul 21, 2025 |\n\n## Resolving User Requests\n\nWhen a user asks for a model by name, use this table to find the correct model ID:\n\n| User says...                              | Use this model ID              |\n|-------------------------------------------|--------------------------------|\n| \"fable\", \"most capable model\"             | `claude-fable-5`                 |\n| \"most powerful\"                           | `claude-fable-5`                 |\n| \"mythos\", \"mythos 5\"                      | `claude-mythos-5` (Project Glasswing participants only; otherwise use `claude-fable-5`) |\n| \"mythos preview\"                          | `claude-mythos-5` (successor to `claude-mythos-preview` — see migration guide) |\n| \"opus\"                                    | `claude-opus-4-8`              |\n| \"opus 4.8\"                                | `claude-opus-4-8`              |\n| \"opus 4.7\"                                | `claude-opus-4-7`              |\n| \"opus 4.6\"                                | `claude-opus-4-6`              |\n| \"opus 4.5\"                                | `claude-opus-4-5`              |\n| \"opus 4.1\"                                | `claude-opus-4-1` (deprecated, retires 2026-08-05 — suggest `claude-opus-4-8`) |\n| \"opus 4\", \"opus 4.0\"                      | `claude-opus-4-0` (deprecated — suggest `claude-opus-4-8`) |\n| \"sonnet\", \"balanced\"                      | `claude-sonnet-5`           |\n| \"sonnet 5\"                                | `claude-sonnet-5`           |\n| \"sonnet 4.6\"                              | `claude-sonnet-4-6`            |\n| \"sonnet 4.5\"                              | `claude-sonnet-4-5`            |\n| \"sonnet 4\", \"sonnet 4.0\"                  | `claude-sonnet-4-0` (deprecated — suggest `claude-sonnet-5`) |\n| \"sonnet 3.7\"                              | Retired — suggest `claude-sonnet-5` |\n| \"sonnet 3.5\"                              | Retired — suggest `claude-sonnet-5` |\n| \"haiku\", \"fast\", \"cheap\"                  | `claude-haiku-4-5`             |\n| \"haiku 4.5\"                               | `claude-haiku-4-5`             |\n| \"haiku 3.5\"                               | Retired — suggest `claude-haiku-4-5` |\n| \"haiku 3\"                                 | Deprecated — suggest `claude-haiku-4-5` |\n</doc>\n\n<doc path=\"shared/platform-availability.md\">\n# Platform Availability\n\nWhich features work on which provider platform. **This table is the single source of truth in this skill** — per-feature sections elsewhere point here instead of restating availability. When writing code for a third-party platform (Bedrock, Vertex, Foundry) or Claude Platform on AWS, check this table first; a feature not supported there means use the first-party Claude API surface or a different approach.\n\nColumns: **1P** = first-party Claude API, **P-AWS** = Claude Platform on AWS (Anthropic-operated, same-day parity), **Bedrock** = Amazon Bedrock, **Vertex** = Google Cloud Vertex AI, **Foundry** = Microsoft Foundry. ✅ = GA, β = beta, ❌ = not supported.\n\n| Feature | 1P | P-AWS | Bedrock | Vertex | Foundry | Notes |\n|---|---|---|---|---|---|---|\n| Messages, streaming, tool use | ✅ | ✅ | ✅ | ✅ | ✅ | Core API |\n| PDF input | ✅ | ✅ | ✅ | ✅ | β | |\n| Structured outputs / strict tool use | ✅ | ✅ | ✅ | ✅ | β | |\n| Adaptive thinking / effort | ✅ | ✅ | ✅ | ✅ | β | |\n| Extended thinking | ✅ | ✅ | ✅ | ✅ | β | |\n| Prompt caching (5m, 1h) | ✅ | ✅ | ✅ | ✅ | β | |\n| Automatic prompt caching | ✅ | ✅ | ❌ | ❌ | β | |\n| Token counting | ✅ | ✅ | ✅ | ✅ | β | |\n| Citations | ✅ | ✅ | ✅ | ✅ | β | |\n| Search results content blocks | ✅ | ✅ | ✅ | ✅ | β | |\n| Fine-grained tool streaming | ✅ | ✅ | ✅ | ✅ | ✅ | |\n| Compaction | β | β | β | β | β | |\n| Context editing | β | β | β | β | β | |\n| Context windows (1M) | ✅ | ✅ | ✅ | ✅ | β | |\n| `inference_geo` (data residency) | ✅ | ✅ | ❌ | ❌ | ❌ | |\n| **Server-side tools** | | | | | | |\n| &nbsp;&nbsp;Web search | ✅ | ✅ | ❌ | ✅ | β | Vertex: basic `web_search_20250305` only (no `_20260209` dynamic filtering) |\n| &nbsp;&nbsp;Web fetch | ✅ | ✅ | ❌ | ❌ | β | |\n| &nbsp;&nbsp;Code execution | ✅ | ✅ | ❌ | ❌ | β | |\n| &nbsp;&nbsp;Tool search | ✅ | ✅ | ✅ | ✅ | β | Bedrock: InvokeModel API only, not Converse |\n| &nbsp;&nbsp;Advisor tool | β | β | ❌ | ❌ | ❌ | |\n| **Client-implemented tools** | | | | | | |\n| &nbsp;&nbsp;Bash, text editor, memory | ✅ | ✅ | ✅ | ✅ | β | |\n| &nbsp;&nbsp;Computer use | β | β | β | β | β | |\n| **Agentic / orchestration** | | | | | | |\n| &nbsp;&nbsp;Agent Skills (Messages API) | β | β | ❌ | ❌ | β | |\n| &nbsp;&nbsp;Programmatic tool calling | ✅ | ✅ | ❌ | ❌ | β | |\n| &nbsp;&nbsp;MCP connector | β | β | ❌ | ❌ | β | |\n| &nbsp;&nbsp;Managed Agents | β | β | ❌ | ❌ | ❌ | Foundry ❌ inferred (not in Foundry docs either way) |\n| &nbsp;&nbsp;Self-hosted sandboxes | β | β | ❌ | ❌ | ❌ | P-AWS: `GET /v1/environments/{id}/work` list endpoint not supported; other work endpoints OK |\n| **API endpoints** | | | | | | |\n| &nbsp;&nbsp;Message Batches | ✅ | ✅ | ❌ | ❌ | ❌ | |\n| &nbsp;&nbsp;Files API | β | β | ❌ | ❌ | β | |\n| &nbsp;&nbsp;Models API | ✅ | ✅ | ❌ | ❌ | ❌ | |\n| **Other** | | | | | | |\n| &nbsp;&nbsp;Mid-conversation system messages | ✅ | ✅ | ❌ | ❌ | ❌ | Claude Opus 4.8 only |\n| &nbsp;&nbsp;Fast mode | β | ❌ | ❌ | ❌ | ❌ | Research preview, beta `fast-mode-2026-02-01`, first-party API only |\n| &nbsp;&nbsp;Cache diagnostics | β | ❌ | ❌ | ❌ | ❌ | First-party API only |\n| &nbsp;&nbsp;Task budgets | β | β | ❌ | ❌ | ❌ | Beta header `task-budgets-2026-03-13`; 3P availability not documented — assume unsupported |\n</doc>\n\n<doc path=\"shared/prompt-caching.md\">\n# Prompt Caching — Design & Optimization\n\nThis file covers how to design prompt-building code for effective caching. For language-specific syntax, see the `## Prompt Caching` section in each language's README or single-file doc.\n\n## The one invariant everything follows from\n\n**Prompt caching is a prefix match. Any change anywhere in the prefix invalidates everything after it.**\n\nThe cache key is derived from the exact bytes of the rendered prompt up to each `cache_control` breakpoint. A single byte difference at position N — a timestamp, a reordered JSON key, a different tool in the list — invalidates the cache for all breakpoints at positions ≥ N.\n\nRender order is: `tools` → `system` → `messages`. A breakpoint on the last system block caches both tools and system together.\n\nDesign the prompt-building path around this constraint. Get the ordering right and most caching works for free. Get it wrong and no amount of `cache_control` markers will help.\n\n---\n\n## Workflow for optimizing existing code\n\nWhen asked to add or optimize caching:\n\n1. **Trace the prompt assembly path.** Find where `system`, `tools`, and `messages` are constructed. Identify every input that flows into them.\n2. **Classify each input by stability:**\n   - Never changes → belongs early in the prompt, before any breakpoint\n   - Changes per-session → belongs after the global prefix, cache per-session\n   - Changes per-turn → belongs at the end, after the last breakpoint\n   - Changes per-request (timestamps, UUIDs, random IDs) → **eliminate or move to the very end**\n3. **Check rendered order matches stability order.** Stable content must physically precede volatile content. If a timestamp is interpolated into the system prompt header, everything after it is uncacheable regardless of markers.\n4. **Place breakpoints at stability boundaries.** See placement patterns below.\n5. **Audit for silent invalidators.** See anti-patterns table.\n\n---\n\n## Placement patterns\n\n### Large system prompt shared across many requests\n\nPut a breakpoint on the last system text block. If there are tools, they render before system — the marker on the last system block caches tools + system together.\n\n```json\n\"system\": [\n  {\"type\": \"text\", \"text\": \"<large shared prompt>\", \"cache_control\": {\"type\": \"ephemeral\"}}\n]\n```\n\n### Multi-turn conversations\n\nPut a breakpoint on the last content block of the most-recently-appended turn. Each subsequent request reuses the entire prior conversation prefix. Earlier breakpoints remain valid read points, so hits accrue incrementally as the conversation grows.\n\n```json\n// Last content block of the last user turn\nmessages[-1].content[-1].cache_control = {\"type\": \"ephemeral\"}\n```\n\n### Shared prefix, varying suffix\n\nMany requests share a large fixed preamble (few-shot examples, retrieved docs, instructions) but differ in the final question. Put the breakpoint at the end of the **shared** portion, not at the end of the whole prompt — otherwise every request writes a distinct cache entry and nothing is ever read.\n\n```json\n\"messages\": [{\"role\": \"user\", \"content\": [\n  {\"type\": \"text\", \"text\": \"<shared context>\", \"cache_control\": {\"type\": \"ephemeral\"}},\n  {\"type\": \"text\", \"text\": \"<varying question>\"}  // no marker — differs every time\n]}]\n```\n\n### Mid-conversation system messages\n\n**Claude Opus 4.8 only; no beta header.** When an operator instruction arrives mid-conversation — a mode switch, updated context, dynamically injected state — send it as `{\"role\": \"system\", \"content\": \"...\"}` appended to `messages[]`, rather than editing top-level `system`. Editing top-level `system` changes the prefix ahead of the entire conversation history, so every cached turn is re-processed uncached; a `role: \"system\"` message sits after the history and leaves the cached prefix intact.\n\n```json\n// Top-level system stays byte-identical; new instruction goes after the cached history\n\"system\": [{\"type\": \"text\", \"text\": \"<stable core>\", \"cache_control\": {\"type\": \"ephemeral\"}}],\n\"messages\": [\n  ...history,\n  {\"role\": \"user\", \"content\": \"...\"},\n  {\"role\": \"system\", \"content\": \"Terse mode enabled — keep responses under 40 words.\"}\n]\n```\n\nThis is also the prompt-injection-safe replacement for embedding operator instructions as text inside a user turn (the `<system-reminder>` pattern): both have the same caching profile, but `role: \"system\"` is the non-spoofable operator channel, whereas text inside user/tool content can be forged by anything that writes to user-visible input.\n\nAvailable on Claude Opus 4.8; no beta header is required. Must follow a `role: \"user\"` message (or an `assistant` message ending in server-tool use), and must be either the last entry in `messages` or be followed by an `assistant` turn; cannot be `messages[0]` — use top-level `system` for the initial prompt. Content is text-only. Unsupported models return a 400 (`BadRequestError`: `role 'system' is not supported on this model`); catch that error and fall back to putting the instruction in a user-turn `<system-reminder>` block.\n\n### Prompts that change from the beginning every time\n\nDon't cache. If the first 1K tokens differ per request, there is no reusable prefix. Adding `cache_control` only pays the cache-write premium with zero reads. Leave it off.\n\n---\n\n## Architectural guidance\n\nThese are the decisions that matter more than marker placement. Fix these first.\n\n**Keep the system prompt frozen.** Don't interpolate \"current date: X\", \"mode: Y\", \"user name: Z\" into the system prompt — those sit at the front of the prefix and invalidate everything downstream. Inject dynamic context later in `messages` instead — as a `{\"role\": \"system\", ...}` message where supported (see § Mid-conversation system messages above), or as text in a user message otherwise. A message at turn 5 invalidates nothing before turn 5.\n\n**Don't change tools or model mid-conversation.** Tools render at position 0; adding, removing, or reordering a tool invalidates the entire cache. Same for switching models (caches are model-scoped). If you need \"modes\", don't swap the tool set — give Claude a tool that records the mode transition, or pass the mode as message content. Serialize tools deterministically (sort by name).\n\n**Fork operations must reuse the parent's exact prefix.** Side computations (summarization, compaction, sub-agents) often spin up a separate API call. If the fork rebuilds `system` / `tools` / `model` with any difference, it misses the parent's cache entirely. Copy the parent's `system`, `tools`, and `model` verbatim, then append fork-specific content at the end.\n\n---\n\n## Silent invalidators\n\nWhen reviewing code, grep for these inside anything that feeds the prompt prefix:\n\n| Pattern | Why it breaks caching |\n|---|---|\n| `datetime.now()` / `Date.now()` / `time.time()` in system prompt | Prefix changes every request |\n| `uuid4()` / `crypto.randomUUID()` / request IDs early in content | Same — every request is unique |\n| `json.dumps(d)` without `sort_keys=True` / iterating a `set` | Non-deterministic serialization → prefix bytes differ |\n| f-string interpolating session/user ID into system prompt | Per-user prefix; no cross-user sharing |\n| Conditional system sections (`if flag: system += ...`) | Every flag combination is a distinct prefix |\n| `tools=build_tools(user)` where set varies per user | Tools render at position 0; nothing caches across users |\n\nFix by moving the dynamic piece after the last breakpoint, making it deterministic, or deleting it if it's not load-bearing.\n\n---\n\n## API reference\n\n```json\n\"cache_control\": {\"type\": \"ephemeral\"}              // 5-minute TTL (default)\n\"cache_control\": {\"type\": \"ephemeral\", \"ttl\": \"1h\"} // 1-hour TTL\n```\n\n- Max **4** `cache_control` breakpoints per request.\n- Goes on any content block: system text blocks, tool definitions, message content blocks (`text`, `image`, `tool_use`, `tool_result`, `document`).\n- Top-level `cache_control` on `messages.create()` auto-places on the last cacheable block — simplest option when you don't need fine-grained placement.\n- Minimum cacheable prefix is model-dependent. Shorter prefixes silently won't cache even with a marker — no error, just `cache_creation_input_tokens: 0`:\n\n| Model | Minimum |\n|---|---:|\n| Opus 4.8, Opus 4.7, Opus 4.6, Opus 4.5, Haiku 4.5 | 4096 tokens |\n| Fable 5, Sonnet 4.6, Haiku 3.5, Haiku 3 | 2048 tokens |\n| Sonnet 4.5, Sonnet 4.1, Sonnet 4, Sonnet 3.7 | 1024 tokens |\n\nA 3K-token prompt caches on Sonnet 4.5 and Fable 5 but silently won't on Opus 4.8.\n\n**Economics:** Cache reads cost ~0.1× base input price. Cache writes cost **1.25× for 5-minute TTL, 2× for 1-hour TTL**. Break-even depends on TTL: with 5-minute TTL, two requests break even (1.25× + 0.1× = 1.35× vs 2× uncached); with 1-hour TTL, you need at least three requests (2× + 0.2× = 2.2× vs 3× uncached). The 1-hour TTL keeps entries alive across gaps in bursty traffic, but the doubled write cost means it needs more reads to pay off.\n\n---\n\n## Verifying cache hits\n\nThe response `usage` object reports cache activity:\n\n| Field | Meaning |\n|---|---|\n| `cache_creation_input_tokens` | Tokens written to cache this request (you paid the ~1.25× write premium) |\n| `cache_read_input_tokens` | Tokens served from cache this request (you paid ~0.1×) |\n| `input_tokens` | Tokens processed at full price (not cached) |\n\nIf `cache_read_input_tokens` is zero across repeated requests with identical prefixes, a silent invalidator is at work — diff the rendered prompt bytes between two requests to find it.\n\n**`input_tokens` is the uncached remainder only.** Total prompt size = `input_tokens + cache_creation_input_tokens + cache_read_input_tokens`. If your agent ran for hours but `input_tokens` shows 4K, the rest was served from cache — check the sum, not the single field.\n\nLanguage-specific access: `response.usage.cache_read_input_tokens` (Python/TS/Ruby), `$message->usage->cacheReadInputTokens` (PHP), `resp.Usage.CacheReadInputTokens` (Go/C#), `.usage().cacheReadInputTokens()` (Java).\n\n---\n\n## Invalidation hierarchy\n\nNot every parameter change invalidates everything. The API has three cache tiers, and changes only invalidate their own tier and below:\n\n| Change | Tools cache | System cache | Messages cache |\n|---|:---:|:---:|:---:|\n| Tool definitions (add/remove/reorder) | ❌ | ❌ | ❌ |\n| Model switch | ❌ | ❌ | ❌ |\n| `speed`, web-search, citations toggle | ✅ | ❌ | ❌ |\n| System prompt content | ✅ | ❌ | ❌ |\n| `tool_choice`, images, `thinking` enable/disable | ✅ | ✅ | ❌ |\n| Message content | ✅ | ✅ | ❌ |\n\nImplication: you can change `tool_choice` per-request or toggle `thinking` without losing the tools+system cache. Don't over-worry about these — only tool-definition and model changes force a full rebuild.\n\n---\n\n## 20-block lookback window\n\nEach breakpoint walks backward **at most 20 content blocks** to find a prior cache entry. If a single turn adds more than 20 blocks (common in agentic loops with many tool_use/tool_result pairs), the next request's breakpoint won't find the previous cache and silently misses.\n\nFix: place an intermediate breakpoint every ~15 blocks in long turns, or put the marker on a block that's within 20 of the previous turn's last cached block.\n\n---\n\n## Concurrent-request timing\n\nA cache entry becomes readable only after the first response **begins streaming**. N parallel requests with identical prefixes all pay full price — none can read what the others are still writing.\n\nFor fan-out patterns: send 1 request, await the first streamed token (not the full response), then fire the remaining N−1. They'll read the cache the first one just wrote.\n\n## Pre-warming the cache\n\nTo eliminate the cache-miss latency on the *first* real request, send a **`max_tokens: 0`** request at startup (or on an interval). The API runs prefill — writing the cache at your `cache_control` breakpoint — and returns immediately with `content: []`, `stop_reason: \"max_tokens\"`, and a populated `usage` block (zero output tokens billed; normal cache-write charge on `cache_creation_input_tokens`).\n\n**When to pre-warm** — pre-warming trades a cache-write charge *now* for lower TTFT on the *next* real request. It's worth it when all three hold: (a) first-request latency is user-visible (chat/voice/interactive — not background jobs), (b) the shared prefix is large enough that a cold write is noticeably slow, and (c) there's a moment *before* traffic to fire it — app startup, worker boot, post-deploy, start of a scheduled window.\n\n| Skip pre-warming when… | Because |\n|---|---|\n| Traffic is continuous (requests ≤ TTL apart) | The first real request warms the cache and every subsequent one hits it; a separate warm call is a pure extra write |\n| The prefix is small or below the cacheable minimum | The cold-write penalty is negligible |\n| The prefix varies per request/user | Nothing shared to pre-warm |\n| You'd pre-warm many distinct prefixes speculatively | Each is a ~1.25× write; cost can exceed the latency you save |\n\n**Scheduled re-warms:** only needed when traffic has gaps longer than the TTL. If real requests arrive more often than every 5 minutes, they keep the cache warm on their own — don't add an interval re-warm. For bursty traffic with long idle gaps, either re-warm just under the TTL or switch to `ttl: \"1h\"` and re-warm less often.\n\n```python\nclient.messages.create(\n    model=\"claude-opus-4-8\",\n    max_tokens=0,\n    system=[{\n        \"type\": \"text\",\n        \"text\": SYSTEM_PROMPT,\n        \"cache_control\": {\"type\": \"ephemeral\"},\n    }],\n    messages=[{\"role\": \"user\", \"content\": \"warmup\"}],\n)\n```\n\n**Breakpoint placement:** put `cache_control` on the **last block shared with the real request** (the system prompt or tool definitions) — **not** on the placeholder user message, and **not** via top-level automatic caching (which would key the cache to the placeholder). The placeholder can be any non-whitespace string; it's read during prefill but never answered.\n\n**Rejected combinations:** `max_tokens: 0` is an `invalid_request_error` with `stream: true`, `thinking.type: \"enabled\"`, `output_config.format`, `tool_choice` of `{\"type\":\"tool\"}` or `{\"type\":\"any\"}`, or inside a Message Batches request.\n\n**TTL still applies** — re-warm at least every 5 minutes for the default cache, or use the 1-hour TTL. This replaces the older `max_tokens: 1` workaround (no single-token reply to discard, no output tokens billed, intent is unambiguous).\n</doc>\n\n<doc path=\"shared/token-counting.md\">\n# Token Counting\n\nUse the `count_tokens` endpoint (`POST /v1/messages/count_tokens`) for accurate\ntoken counts against Claude models. Token counts are **model-specific** — pass\nthe same model ID you'll use for inference.\n\n**Do not use `tiktoken`.** It's OpenAI's tokenizer. It undercounts Claude\ntokens by ~15–20% on typical text, and by much more on code or non-English\ninput. Any estimate from `tiktoken`, `gpt-tokenizer`, or similar is wrong for\nClaude.\n\n## Count a file or string\n\n```python\nfrom anthropic import Anthropic\n\nclient = Anthropic()\nresp = client.messages.count_tokens(\n    model=\"claude-opus-4-8\",\n    messages=[{\"role\": \"user\", \"content\": open(\"CLAUDE.md\").read()}],\n)\nprint(resp.input_tokens)\n```\n\nTypeScript: `await client.messages.countTokens({model, messages})` →\n`.input_tokens`. See `{lang}/claude-api/README.md` for other SDKs.\n\n## CLI\n\n```sh\nant messages count-tokens --model claude-opus-4-8 \\\n  --message '{role: user, content: \"@./CLAUDE.md\"}' \\\n  --transform input_tokens -r\n```\n\n## Diffing a file across two versions\n\nThe endpoint is stateless — count each version separately and subtract:\n\n```python\nfrom anthropic import Anthropic\nimport subprocess\n\nclient = Anthropic()\ndef count(text: str) -> int:\n    return client.messages.count_tokens(\n        model=\"claude-opus-4-8\",\n        messages=[{\"role\": \"user\", \"content\": text}],\n    ).input_tokens\n\nbefore = subprocess.check_output([\"git\", \"show\", \"HEAD:CLAUDE.md\"], text=True)\nafter = open(\"CLAUDE.md\").read()\nprint(count(after) - count(before))\n```\n\nFull docs: see the Token Counting entry in `shared/live-sources.md`.\n</doc>\n\n<doc path=\"shared/tool-use-concepts.md\">\n# Tool Use Concepts\n\nThis file covers the conceptual foundations of tool use with the Claude API. For language-specific code examples, see the `python/`, `typescript/`, or other language folders. For decision heuristics on which tools to expose, how to manage context in long-running agents, and caching strategy, see `agent-design.md`.\n\n## User-Defined Tools\n\n### Tool Definition Structure\n\n> **Note:** When using the Tool Runner (beta), tool schemas are generated automatically from your function signatures (Python), Zod schemas (TypeScript), annotated classes (Java), `jsonschema` struct tags (Go), or `BaseTool` subclasses (Ruby). The raw JSON schema format below is for the manual approach — including PHP's `BetaRunnableTool`, which wraps a run closure around a hand-written schema — or SDKs without tool runner support.\n\nEach tool requires a name, description, and JSON Schema for its inputs:\n\n```json\n{\n  \"name\": \"get_weather\",\n  \"description\": \"Get current weather for a location\",\n  \"input_schema\": {\n    \"type\": \"object\",\n    \"properties\": {\n      \"location\": {\n        \"type\": \"string\",\n        \"description\": \"City and state, e.g., San Francisco, CA\"\n      },\n      \"unit\": {\n        \"type\": \"string\",\n        \"enum\": [\"celsius\", \"fahrenheit\"],\n        \"description\": \"Temperature unit\"\n      }\n    },\n    \"required\": [\"location\"]\n  }\n}\n```\n\n**Best practices for tool definitions:**\n\n- Use clear, descriptive names (e.g., `get_weather`, `search_database`, `send_email`)\n- Write detailed descriptions — Claude uses these to decide when to use the tool. Be **prescriptive about *when* to call it**, not just what it does (e.g. \"Call this when the user asks about current prices or recent events\"). On recent Opus models, which reach for tools more conservatively, trigger conditions in the description give measurable lift in should-call rate.\n- Include descriptions for each property\n- Use `enum` for parameters with a fixed set of values\n- Mark truly required parameters in `required`; make others optional with defaults\n\n---\n\n### Tool Choice Options\n\nControl when Claude uses tools:\n\n| Value                             | Behavior                                      |\n| --------------------------------- | --------------------------------------------- |\n| `{\"type\": \"auto\"}`                | Claude decides whether to use tools (default) |\n| `{\"type\": \"any\"}`                 | Claude must use at least one tool             |\n| `{\"type\": \"tool\", \"name\": \"...\"}` | Claude must use the specified tool            |\n| `{\"type\": \"none\"}`                | Claude cannot use tools                       |\n\nAny `tool_choice` value can also include `\"disable_parallel_tool_use\": true` to force Claude to use at most one tool per response. By default, Claude may request multiple tool calls in a single response.\n\n---\n\n### Tool Runner vs Manual Loop\n\n**Tool Runner (Recommended):** The SDK's tool runner handles the agentic loop automatically — it calls the API, detects tool use requests, executes your tool functions, feeds results back to Claude, and repeats until Claude stops calling tools. Available in Python, TypeScript, Java, Go, Ruby, and PHP SDKs (beta). The Python SDK also provides MCP conversion helpers (`anthropic.lib.tools.mcp`) to convert MCP tools, prompts, and resources for use with the tool runner — see `python/claude-api/tool-use.md` for details.\n\n**Manual Agentic Loop:** Use when you need fine-grained control over the loop (e.g., custom logging, conditional tool execution, human-in-the-loop approval). Loop until `stop_reason == \"end_turn\"`, always append the full `response.content` to preserve tool_use blocks, and ensure each `tool_result` includes the matching `tool_use_id`.\n\n**Stop reasons for server-side tools:** When using server-side tools (code execution, web search, etc.), the API runs a server-side sampling loop. If this loop reaches its default limit of 10 iterations, the response will have `stop_reason: \"pause_turn\"`. To continue, re-send the user message and assistant response and make another API request — the server will resume where it left off. Do NOT add an extra user message like \"Continue.\" — the API detects the trailing `server_tool_use` block and knows to resume automatically.\n\n```python\n# Handle pause_turn in your agentic loop\nif response.stop_reason == \"pause_turn\":\n    messages = [\n        {\"role\": \"user\", \"content\": user_query},\n        {\"role\": \"assistant\", \"content\": response.content},\n    ]\n    # Make another API request — server resumes automatically\n    response = client.messages.create(\n        model=\"claude-opus-4-8\", messages=messages, tools=tools\n    )\n```\n\nSet a `max_continuations` limit (e.g., 5) to prevent infinite loops. For the full guide, see: `https://platform.claude.com/docs/en/build-with-claude/handling-stop-reasons`\n\n> **Security:** The tool runner executes your tool functions automatically whenever Claude requests them. For tools with side effects (sending emails, modifying databases, financial transactions), validate inputs within your tool functions and consider requiring confirmation for destructive operations. Use the manual agentic loop if you need human-in-the-loop approval before each tool execution.\n\n---\n\n### Handling Tool Results\n\nWhen Claude uses a tool, the response contains a `tool_use` block. You must:\n\n1. Execute the tool with the provided input\n2. Send the result back in a `tool_result` message\n3. Continue the conversation\n\n**Error handling in tool results:** When a tool execution fails, set `\"is_error\": true` and provide an informative error message. Claude will typically acknowledge the error and either try a different approach or ask for clarification.\n\n**Multiple tool calls:** Claude can request multiple tools in a single response. Handle them all before continuing — send all results back in a single `user` message.\n\n---\n\n## Server-Side Tools: Code Execution\n\nThe code execution tool lets Claude run code in a secure, sandboxed container. Unlike user-defined tools, server-side tools run on Anthropic's infrastructure — you don't execute anything client-side. Just include the tool definition and Claude handles the rest.\n\n### Key Facts\n\n- Runs in an isolated container (1 CPU, 5 GiB RAM, 5 GiB disk)\n- No internet access (fully sandboxed)\n- Python 3.11 with data science libraries pre-installed\n- Containers persist for 30 days and can be reused across requests\n- Free when used with web search/web fetch tools; otherwise $0.05/hour after 1,550 free hours/month per organization\n\n### Tool Definition\n\nThe tool requires no schema — just declare it in the `tools` array:\n\n```json\n{\n  \"type\": \"code_execution_20260120\",\n  \"name\": \"code_execution\"\n}\n```\n\nClaude automatically gains access to `bash_code_execution` (run shell commands) and `text_editor_code_execution` (create/view/edit files).\n\n### Pre-installed Python Libraries\n\n- **Data science**: pandas, numpy, scipy, scikit-learn, statsmodels\n- **Visualization**: matplotlib, seaborn\n- **File processing**: openpyxl, xlsxwriter, pillow, pypdf, pdfplumber, python-docx, python-pptx\n- **Math**: sympy, mpmath\n- **Utilities**: tqdm, python-dateutil, pytz, sqlite3\n\nAdditional packages can be installed at runtime via `pip install`.\n\n### Supported File Types for Upload\n\n| Type   | Extensions                         |\n| ------ | ---------------------------------- |\n| Data   | CSV, Excel (.xlsx/.xls), JSON, XML |\n| Images | JPEG, PNG, GIF, WebP               |\n| Text   | .txt, .md, .py, .js, etc.          |\n\n### Container Reuse\n\nReuse containers across requests to maintain state (files, installed packages, variables). Extract the `container_id` from the first response and pass it to subsequent requests.\n\n### Response Structure\n\nThe response contains interleaved text and tool result blocks:\n\n- `text` — Claude's explanation\n- `server_tool_use` — What Claude is doing\n- `bash_code_execution_tool_result` — Code execution output (check `return_code` for success/failure)\n- `text_editor_code_execution_tool_result` — File operation results\n\n> **Security:** Always sanitize filenames with `os.path.basename()` / `path.basename()` before writing downloaded files to disk to prevent path traversal attacks. Write files to a dedicated output directory.\n\n---\n\n## Server-Side Tools: Web Search and Web Fetch\n\nWeb search and web fetch let Claude search the web and retrieve page content. They run server-side — just include the tool definitions and Claude handles queries, fetching, and result processing automatically.\n\n### Tool Definitions\n\n```json\n[\n  { \"type\": \"web_search_20260209\", \"name\": \"web_search\" },\n  { \"type\": \"web_fetch_20260209\", \"name\": \"web_fetch\" }\n]\n```\n\n### Dynamic Filtering (Fable 5 / Opus 4.8 / Opus 4.7 / Opus 4.6 / Sonnet 4.6)\n\nThe `web_search_20260209` and `web_fetch_20260209` versions support **dynamic filtering** — Claude writes and executes code to filter search results before they reach the context window, improving accuracy and token efficiency. Dynamic filtering is built into these tool versions and activates automatically; you do not need to separately declare the `code_execution` tool or pass any beta header.\n\n```json\n{\n  \"tools\": [\n    { \"type\": \"web_search_20260209\", \"name\": \"web_search\" },\n    { \"type\": \"web_fetch_20260209\", \"name\": \"web_fetch\" }\n  ]\n}\n```\n\nWithout dynamic filtering, the previous `web_search_20250305` version is also available.\n\n> **Note:** Only include the standalone `code_execution` tool when your application needs code execution for its own purposes (data analysis, file processing, visualization) independent of web search. Including it alongside `_20260209` web tools creates a second execution environment that can confuse the model.\n\n---\n\n## Server-Side Tools: Programmatic Tool Calling\n\nWith standard tool use, each tool call is a round trip: Claude calls, the result enters Claude's context, Claude reasons, then calls the next tool. Chained calls accumulate latency and tokens — most of that intermediate data is never needed again.\n\nProgrammatic tool calling lets Claude compose those calls into a script. The script runs in the code execution container; when it invokes a tool, the container pauses, the call executes, and the result returns to the running code (not to Claude's context). The script processes it with normal control flow. Only the final output returns to Claude. Use it when chaining many tool calls or when intermediate results are large and should be filtered before reaching the context window.\n\nFor full documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling`\n\n---\n\n## Server-Side Tools: Tool Search\n\nThe tool search tool lets Claude dynamically discover tools from large libraries without loading all definitions into the context window. Use it when you have many tools but only a few are relevant to any given request. Discovered tool schemas are appended to the request, not swapped in — this preserves the prompt cache (see `agent-design.md` §Caching for Agents).\n\nFor full documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool`\n\n---\n\n## Agent Skills (Messages API)\n\nAgent Skills package task-specific instructions and files that Claude loads when relevant (e.g., the Anthropic pre-built `pptx`, `xlsx`, `pdf`, `docx` skills). On the **Messages API**, skills are enabled via the `container` parameter alongside the code-execution tool — this is **not** the Managed Agents surface and does **not** use `client.beta.agents` / `sessions` / `environments`. Availability: see `shared/platform-availability.md`.\n\nRequired on each request:\n\n1. `client.beta.messages.create(...)` with **both** beta flags: `code-execution-2025-08-25` **and** `skills-2025-10-02`.\n2. `container={\"skills\": [{\"type\": \"anthropic\", \"skill_id\": \"<id>\", \"version\": \"latest\"}]}` — the skills list selects which skills are available inside the execution container.\n3. `tools=[{\"type\": \"code_execution_20260521\", \"name\": \"code_execution\"}]` — skills execute via code execution in the container.\n\n```python\nresponse = client.beta.messages.create(\n    model=\"claude-opus-4-8\", max_tokens=16000,\n    betas=[\"code-execution-2025-08-25\", \"skills-2025-10-02\"],\n    container={\"skills\": [{\"type\": \"anthropic\", \"skill_id\": \"pptx\", \"version\": \"latest\"}]},\n    tools=[{\"type\": \"code_execution_20260521\", \"name\": \"code_execution\"}],\n    messages=[{\"role\": \"user\", \"content\": \"Create a 3-slide presentation on X\"}],\n)\n```\n\nGenerated files (`.pptx`, `.xlsx`, …) are written inside the container; the response carries a file ID for each. Download by passing that ID to the Files API (`client.beta.files.download(file_id)` / `GET /v1/files/{id}/content` with `anthropic-beta: files-api-2025-04-14`).\n\nList available skills via `GET /v1/skills` (requires `anthropic-beta: skills-2025-10-02`).\n\n---\n\n## MCP Connector (Beta)\n\nThe MCP connector lets Claude call tools hosted on a remote MCP server directly from the Messages API — Anthropic makes the MCP connection server-side. Requires beta flag `mcp-client-2025-11-20` on `client.beta.messages.create(...)`. Availability: see `shared/platform-availability.md`.\n\n**Two parameters are required together:**\n\n- `mcp_servers` — array of server connection definitions: `[{\"type\": \"url\", \"url\": \"<server URL>\", \"name\": \"<server-name>\", \"authorization_token\": \"<optional>\"}]`\n- `tools` — must include an `mcp_toolset` entry that references the server by name: `[{\"type\": \"mcp_toolset\", \"mcp_server_name\": \"<server-name>\"}]`\n\nThe `mcp_server_name` in the toolset must match a `name` in `mcp_servers`. Omitting the `mcp_toolset` entry is rejected as a validation error — every server in `mcp_servers` must be referenced by exactly one toolset.\n\n```python\nclient.beta.messages.create(\n    model=\"claude-opus-4-8\", max_tokens=1024,\n    betas=[\"mcp-client-2025-11-20\"],\n    mcp_servers=[{\"type\": \"url\", \"url\": \"https://example/sse\", \"name\": \"example-mcp\"}],\n    tools=[{\"type\": \"mcp_toolset\", \"mcp_server_name\": \"example-mcp\"}],\n    messages=[...],\n)\n```\n\nGo uses the typed constant `anthropic.AnthropicBetaMCPClient2025_11_20`; the older `…2025_04_04` constant is deprecated.\n\nOptional toolset fields: `default_config` (defaults for all tools, e.g. `{\"enabled\": false}` for allowlist mode) and `configs` (per-tool overrides keyed by tool name).\n\n---\n\n## Tool Use Examples\n\nYou can provide sample tool calls directly in your tool definitions to demonstrate usage patterns and reduce parameter errors. This helps Claude understand how to correctly format tool inputs, especially for tools with complex schemas.\n\nFor full documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/agents-and-tools/tool-use/implement-tool-use`\n\n---\n\n## Client-Side Tools: Computer Use\n\nComputer use lets Claude interact with a desktop environment (screenshots, mouse, keyboard). It is a client-side tool — your application provides the environment and executes the actions Claude requests; Anthropic processes the screenshots and action requests in real time but does not host the environment or retain the data.\n\nFor full documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/agents-and-tools/computer-use/overview`\n\n---\n\n## Context Editing\n\nContext editing clears stale tool results and thinking blocks from the transcript as a long-running agent accumulates turns. Unlike compaction (which summarizes), context editing prunes — the cleared content is removed, not replaced. Use it when old tool outputs are no longer relevant and you want to keep the transcript lean without losing the conversation structure.\n\n**Beta.** Use `client.beta.messages.*` with beta `context-management-2025-06-27`. Configure via `context_management.edits` with a strategy type of `clear_tool_uses_20250919` (clear old tool results; optional `clear_tool_inputs: true` also clears the tool_use params) or `clear_thinking_20251015` (clear thinking blocks). These are **not** the compaction types — `compact_20260112` with beta `compact-2026-01-12` is the separate compaction feature.\n\nFor full documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/build-with-claude/context-editing`\n\n---\n\n## Server-Side Tools: Advisor (Beta)\n\nThe advisor tool pairs a faster, lower-cost **executor** model (the top-level `model` on the request) with a higher-intelligence **advisor** model (the `model` field inside the tool definition) that provides strategic guidance mid-generation. The executor does most of the token generation; the advisor is consulted for planning. Availability: see `shared/platform-availability.md`.\n\n### Tool Definition\n\n```json\n{\n  \"type\": \"advisor_20260301\",\n  \"name\": \"advisor\",\n  \"model\": \"claude-opus-4-8\"\n}\n```\n\n**The advisor model must be at least as capable as the executor.** An invalid pairing returns `400 invalid_request_error`. Valid pairs:\n\n| Executor (request `model`) | Valid advisor (tool `model`) |\n|---|---|\n| `claude-haiku-4-5` / `claude-sonnet-4-6` / `claude-sonnet-5` / `claude-opus-4-6` / `claude-opus-4-7` | `claude-opus-4-8` or `claude-opus-4-7` |\n| `claude-opus-4-8` | `claude-opus-4-8` only |\n\nCall via `client.beta.messages.create(...)` with `betas=[\"advisor-tool-2026-03-01\"]` (or the `anthropic-beta: advisor-tool-2026-03-01` header). In multi-turn conversations, append the full `response.content` — including any `advisor_tool_result` blocks — back to `messages` on the next turn. If you remove the advisor tool from `tools` on a later turn while the history still contains `advisor_tool_result` blocks, the API returns a 400.\n\n---\n\n## Client-Side Tools: Memory\n\nThe memory tool enables Claude to store and retrieve information across conversations through a memory file directory. Claude can create, read, update, and delete files that persist between sessions.\n\n### Key Facts\n\n- Client-side tool — you control storage via your implementation\n- Supports commands: `view`, `create`, `str_replace`, `insert`, `delete`, `rename`\n- Operates on files in a `/memories` directory\n- The Python, TypeScript, and Java SDKs provide helper classes/functions for implementing the memory backend\n\n> **Security:** Never store API keys, passwords, tokens, or other secrets in memory files. Be cautious with personally identifiable information (PII) — check data privacy regulations (GDPR, CCPA) before persisting user data. The reference implementations have no built-in access control; in multi-user systems, implement per-user memory directories and authentication in your tool handlers.\n\nFor full implementation examples, use WebFetch:\n\n- Docs: `https://platform.claude.com/docs/en/agents-and-tools/tool-use/memory-tool.md`\n\n---\n\n## Client-Side Tools: Bash and Text Editor\n\nThe bash and text editor tools are **Anthropic-defined, schema-less** tools. Declare them by `type` and `name` only — the input schema is built into the model and cannot be modified. **Do not pass an `input_schema`**, and do not define a custom tool that happens to be named `\"bash\"` — that creates a user-defined tool without the built-in behavior.\n\nBoth are **client-executed**: Claude returns a `tool_use` block, your code performs the action locally, and you send back a `tool_result`. The API is stateless; your application maintains the shell session or filesystem between turns.\n\n### Bash tool declaration\n\n```json\n{\"type\": \"bash_20250124\", \"name\": \"bash\"}\n```\n\n| Language | Declaration |\n|---|---|\n| Python / TypeScript / Ruby / cURL | plain object `{\"type\": \"bash_20250124\", \"name\": \"bash\"}` |\n| Go | `anthropic.ToolUnionParam{OfBashTool20250124: &anthropic.ToolBash20250124Param{}}` |\n| Java | `.addTool(ToolBash20250124.builder().build())` from `com.anthropic.models.messages` |\n| C# | `Tools = [new ToolBash20250124()]` from `Anthropic.Models.Messages` |\n| PHP | `tools: [new \\Anthropic\\Messages\\ToolBash20250124()]` |\n\nClaude's `tool_use.input` contains either `{\"command\": \"<string>\"}` or `{\"restart\": true}`. Check for `restart` first (reset the session, return a confirmation string); otherwise run `command` and return combined stdout + stderr.\n\n> **Security — commands are untrusted model output.** Run in an isolated environment (container, VM, or restricted user); apply an **allowlist** of permitted executables and reject shell operators (`&&`, `|`, `;`, `` ` ``, `$()`); set timeouts and resource limits; log every command. A blocklist is not sufficient.\n\n### Text editor tool declaration\n\n```json\n{\"type\": \"text_editor_20250728\", \"name\": \"str_replace_based_edit_tool\"}\n```\n\nOptional field: `max_characters` to cap `view` output. Java exposes a typed `ToolTextEditor20250728` builder (`com.anthropic.models.messages`); other statically-typed SDKs follow the same naming pattern — see the Anthropic-Defined Tools section in `{lang}/claude-api/tool-use.md` for the exact class.\n\n> **Security — `path` is untrusted model output. Confine every file operation to a fixed project root.** Before executing any command, resolve the model-supplied `path` to its canonical form and verify it remains within your project root; reject the request if it escapes (`..`, symlinks, absolute paths outside the root, URL-encoded traversal like `%2e%2e%2f`). Use your language's built-in path utilities (e.g., Python `pathlib.Path.resolve()` then check `.is_relative_to(root)`). Never call `open()` / `writeFile` / `unlink` directly on the raw `path` value.\n\n`tool_use.input.command` is one of:\n\n| `command` | Other inputs | Action |\n|---|---|---|\n| `view` | `path`, optional `view_range` | Return file contents or directory listing |\n| `create` | `path`, `file_text` | Create/overwrite file with `file_text`. Create a backup if the file already exists. |\n| `str_replace` | `path`, `old_str`, `new_str` | Replace exactly one occurrence; error if 0 or >1 matches |\n| `insert` | `path`, `insert_line`, `insert_text` | Insert `insert_text` after line `insert_line` (0 = beginning of file) |\n\nFor both tools, on error return `{\"type\": \"tool_result\", \"tool_use_id\": \"…\", \"content\": \"<error text>\", \"is_error\": true}` so Claude can recover.\n\n---\n\n## Structured Outputs\n\nStructured outputs constrain Claude's responses to follow a specific JSON schema, guaranteeing valid, parseable output. This is not a separate tool — it enhances the Messages API response format and/or tool parameter validation.\n\nTwo features are available:\n\n- **JSON outputs** (`output_config.format`): Control Claude's response format\n- **Strict tool use** (`strict: true`): Guarantee valid tool parameter schemas\n\n**Supported models:** Claude Fable 5, Claude Opus 4.8, Claude Sonnet 5, and Claude Haiku 4.5. Legacy models (Claude Opus 4.5, Claude Opus 4.1) also support structured outputs.\n\n> **Recommended:** Use `client.messages.parse()` which automatically validates responses against your schema. When using `messages.create()` directly, use `output_config: {format: {...}}`. The `output_format` convenience parameter is also accepted by some SDK methods (e.g., `.parse()`), but `output_config.format` is the canonical API-level parameter.\n\n### JSON Schema Limitations\n\n**Supported:**\n\n- Basic types: object, array, string, integer, number, boolean, null\n- `enum`, `const`, `anyOf`, `allOf`, `$ref`/`$def`\n- String formats: `date-time`, `time`, `date`, `duration`, `email`, `hostname`, `uri`, `ipv4`, `ipv6`, `uuid`\n- `additionalProperties: false` (required for all objects)\n\n**Not supported:**\n\n- Recursive schemas\n- Numerical constraints (`minimum`, `maximum`, `multipleOf`)\n- String constraints (`minLength`, `maxLength`)\n- Complex array constraints\n- `additionalProperties` set to anything other than `false`\n\nThe Python and TypeScript SDKs automatically handle unsupported constraints by removing them from the schema sent to the API and validating them client-side.\n\n### Important Notes\n\n- **First request latency**: New schemas incur a one-time compilation cost. Subsequent requests with the same schema use a 24-hour cache.\n- **Refusals**: If Claude refuses for safety reasons (`stop_reason: \"refusal\"`), the output may not match your schema.\n- **Token limits**: If `stop_reason: \"max_tokens\"`, output may be incomplete. Increase `max_tokens`.\n- **Incompatible with**: Citations (returns 400 error), message prefilling.\n- **Works with**: Batches API, streaming, token counting, extended thinking.\n\n---\n\n## Tips for Effective Tool Use\n\n1. **Provide detailed descriptions**: Claude relies heavily on descriptions to understand when and how to use tools\n2. **Use specific tool names**: `get_current_weather` is better than `weather`\n3. **Validate inputs**: Always validate tool inputs before execution\n4. **Handle errors gracefully**: Return informative error messages so Claude can adapt\n5. **Limit tool count**: Too many tools can confuse the model — keep the set focused\n6. **Test tool interactions**: Verify Claude uses tools correctly in various scenarios\n\nFor detailed tool use documentation, use WebFetch:\n\n- URL: `https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview`\n</doc>\n\n<doc path=\"typescript/claude-api/README.md\">\n# Claude API — TypeScript\n\n| Feature | Namespace | Key types / call |\n|---|---|---|\n| User profiles | beta | `client.beta.userProfiles.create(...)` / `.retrieve(id)` / `.list()`. Pass the returned profile id on `client.beta.messages.create`. Requires a beta header — check the SDK's beta-headers reference for the current flag. |\n\n## Installation\n\n```bash\nnpm install @anthropic-ai/sdk\n```\n\n> **Reading local files (ESM):** `__dirname` and `__filename` are **undefined** in ES modules — using either throws `ReferenceError: __dirname is not defined` at runtime. For cwd-relative reads, pass the bare relative path (`fs.readFileSync(\"./sample.png\")`). For script-relative paths, derive the directory from `import.meta.url`: `const here = path.dirname(fileURLToPath(import.meta.url))`. Never write `path.join(__dirname, …)` in an ESM `.ts` file.\n\n## Client Initialization\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\n// Default — resolves credentials from the environment:\n// ANTHROPIC_API_KEY, or ANTHROPIC_AUTH_TOKEN, or an `ant auth login` profile.\n// Prefer this for local dev; don't hardcode a key.\nconst client = new Anthropic();\n\n// Explicit API key (only when you must inject a specific key)\nconst client = new Anthropic({ apiKey: \"your-api-key\" });\n```\n\n---\n\n## Basic Message Request\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [{ role: \"user\", content: \"What is the capital of France?\" }],\n});\n// response.content is ContentBlock[] — a discriminated union. Narrow by .type\n// before accessing .text (TypeScript will error on content[0].text without this).\nfor (const block of response.content) {\n  if (block.type === \"text\") {\n    console.log(block.text);\n  }\n}\n```\n\n---\n\n## System Prompts\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  system:\n    \"You are a helpful coding assistant. Always provide examples in Python.\",\n  messages: [{ role: \"user\", content: \"How do I read a JSON file?\" }],\n});\n```\n\n### Mid-conversation system messages (model-gated)\n\nFor operator instructions that arrive mid-conversation (mode switches, injected state), append `{role: \"system\", ...}` to `messages` instead of editing top-level `system` — this preserves the cached prefix and carries operator authority. Must follow a user message (or an `assistant` message ending in server-tool use), and must be either the last entry in `messages` or be followed by an `assistant` turn; cannot be `messages[0]`. Unsupported models return a 400 (`role 'system' is not supported on this model`). See `shared/prompt-caching.md` for when to use this vs. top-level `system`.\n\n```typescript\n// No beta header needed — use regular client.messages.create.\nconst response = await client.messages.create({\n  model: MODEL_ID, // must support mid-conversation system messages\n  max_tokens: 16000,\n  system: [\n    { type: \"text\", text: STABLE_SYSTEM, cache_control: { type: \"ephemeral\" } },\n  ],\n  messages: [\n    ...history,\n    { role: \"user\", content: userMessage },\n    { role: \"system\", content: \"Terse mode enabled — keep responses under 40 words.\" },\n  ],\n});\n```\n\n---\n\n## Vision (Images)\n\n### URL\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: [\n        {\n          type: \"image\",\n          source: { type: \"url\", url: \"https://example.com/image.png\" },\n        },\n        { type: \"text\", text: \"Describe this image\" },\n      ],\n    },\n  ],\n});\n```\n\n### Base64\n\n```typescript\nimport fs from \"fs\";\n\nconst imageData = fs.readFileSync(\"image.png\").toString(\"base64\");\n\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: [\n        {\n          type: \"image\",\n          source: { type: \"base64\", media_type: \"image/png\", data: imageData },\n        },\n        { type: \"text\", text: \"What's in this image?\" },\n      ],\n    },\n  ],\n});\n```\n\n---\n\n## Prompt Caching\n\n**Caching is a prefix match** — any byte change anywhere in the prefix invalidates everything after it. For placement patterns, architectural guidance (frozen system prompt, deterministic tool order, where to put volatile content), and the silent-invalidator audit checklist, read `shared/prompt-caching.md`.\n\n### Automatic Caching (Recommended)\n\nUse top-level `cache_control` to automatically cache the last cacheable block in the request:\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  cache_control: { type: \"ephemeral\" }, // auto-caches the last cacheable block\n  system: \"You are an expert on this large document...\",\n  messages: [{ role: \"user\", content: \"Summarize the key points\" }],\n});\n```\n\n### Manual Cache Control\n\nFor fine-grained control, add `cache_control` to specific content blocks:\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  system: [\n    {\n      type: \"text\",\n      text: \"You are an expert on this large document...\",\n      cache_control: { type: \"ephemeral\" }, // default TTL is 5 minutes\n    },\n  ],\n  messages: [{ role: \"user\", content: \"Summarize the key points\" }],\n});\n\n// With explicit TTL (time-to-live)\nconst response2 = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  system: [\n    {\n      type: \"text\",\n      text: \"You are an expert on this large document...\",\n      cache_control: { type: \"ephemeral\", ttl: \"1h\" }, // 1 hour TTL\n    },\n  ],\n  messages: [{ role: \"user\", content: \"Summarize the key points\" }],\n});\n```\n\n### Verifying Cache Hits\n\n```typescript\nconsole.log(response.usage.cache_creation_input_tokens); // tokens written to cache (~1.25x cost)\nconsole.log(response.usage.cache_read_input_tokens);     // tokens served from cache (~0.1x cost)\nconsole.log(response.usage.input_tokens);                // uncached tokens (full cost)\n```\n\nIf `cache_read_input_tokens` is zero across repeated identical-prefix requests, a silent invalidator is at work — `Date.now()` or a UUID in the system prompt, non-deterministic key ordering, or a varying tool set. See `shared/prompt-caching.md` for the full audit table.\n\n---\n\n## Extended Thinking\n\n> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking. `budget_tokens` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.\n> **Older models:** Use `thinking: {type: \"enabled\", budget_tokens: N}` (must be < `max_tokens`, min 1024).\n\n```typescript\n// Fable 5 / Opus 4.8 / 4.7 / 4.6: adaptive thinking (recommended)\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  thinking: { type: \"adaptive\", display: \"summarized\" }, // display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n  output_config: { effort: \"high\" }, // low | medium | high | max\n  messages: [\n    { role: \"user\", content: \"Solve this math problem step by step...\" },\n  ],\n});\n\nfor (const block of response.content) {\n  if (block.type === \"thinking\") {\n    console.log(\"Thinking:\", block.thinking);\n  } else if (block.type === \"text\") {\n    console.log(\"Response:\", block.text);\n  }\n}\n```\n\n---\n\n## Error Handling\n\nUse the SDK's typed exception classes — never check error messages with string matching:\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\ntry {\n  const response = await client.messages.create({...});\n} catch (error) {\n  if (error instanceof Anthropic.BadRequestError) {\n    console.error(\"Bad request:\", error.message);\n  } else if (error instanceof Anthropic.AuthenticationError) {\n    console.error(\"Invalid API key\");\n  } else if (error instanceof Anthropic.RateLimitError) {\n    console.error(\"Rate limited - retry later\");\n  } else if (error instanceof Anthropic.APIError) {\n    console.error(`API error ${error.status}:`, error.message);\n  }\n}\n```\n\nAll classes extend `Anthropic.APIError` with a typed `status` field. Check from most specific to least specific. See [shared/error-codes.md](../../shared/error-codes.md) for the full error code reference.\n\n---\n\n## Multi-Turn Conversations\n\nThe API is stateless — send the full conversation history each time. Use `Anthropic.MessageParam[]` to type the messages array:\n\n```typescript\nconst messages: Anthropic.MessageParam[] = [\n  { role: \"user\", content: \"My name is Alice.\" },\n  { role: \"assistant\", content: \"Hello Alice! Nice to meet you.\" },\n  { role: \"user\", content: \"What's my name?\" },\n];\n\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: messages,\n});\n```\n\n**Rules:**\n\n- Consecutive same-role messages are allowed — the API combines them into a single turn\n- First message must be `user`\n- Use SDK types (`Anthropic.MessageParam`, `Anthropic.Message`, `Anthropic.Tool`, etc.) for all API data structures — don't redefine equivalent interfaces\n\n---\n\n### Compaction (long conversations)\n\n> **Beta, Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6.** When conversations approach the 200K context window, compaction automatically summarizes earlier context server-side. The API returns a `compaction` block; you must pass it back on subsequent requests — append `response.content`, not just the text.\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\nconst messages: Anthropic.Beta.BetaMessageParam[] = [];\n\nasync function chat(userMessage: string): Promise<string> {\n  messages.push({ role: \"user\", content: userMessage });\n\n  const response = await client.beta.messages.create({\n    betas: [\"compact-2026-01-12\"],\n    model: \"claude-opus-4-8\",\n    max_tokens: 16000,\n    messages,\n    context_management: {\n      edits: [{ type: \"compact_20260112\" }],\n    },\n  });\n\n  // Append full content — compaction blocks must be preserved\n  messages.push({ role: \"assistant\", content: response.content });\n\n  const textBlock = response.content.find(\n    (b): b is Anthropic.Beta.BetaTextBlock => b.type === \"text\",\n  );\n  return textBlock?.text ?? \"\";\n}\n\n// Compaction triggers automatically when context grows large\nconsole.log(await chat(\"Help me build a Python web scraper\"));\nconsole.log(await chat(\"Add support for JavaScript-rendered pages\"));\nconsole.log(await chat(\"Now add rate limiting and error handling\"));\n```\n\n---\n\n## Stop Reasons\n\nThe `stop_reason` field in the response indicates why the model stopped generating:\n\n| Value           | Meaning                                                         |\n| --------------- | --------------------------------------------------------------- |\n| `end_turn`      | Claude finished its response naturally                          |\n| `max_tokens`    | Hit the `max_tokens` limit — increase it or use streaming       |\n| `stop_sequence` | Hit a custom stop sequence                                      |\n| `tool_use`      | Claude wants to call a tool — execute it and continue           |\n| `pause_turn`    | Model paused and can be resumed (agentic flows)                 |\n| `refusal`       | Claude refused for safety reasons — check `stop_details`        |\n\n### Structured Stop Details\n\nWhen `stop_reason` is `\"refusal\"`, the response includes a `stop_details` object with structured information about the refusal:\n\n```typescript\nif (response.stop_reason === \"refusal\" && response.stop_details) {\n  console.log(`Category: ${response.stop_details.category}`); // e.g. \"cyber\", \"bio\", \"reasoning_extraction\", \"frontier_llm\", or null — see docs for the full set\n  console.log(`Explanation: ${response.stop_details.explanation}`);\n}\n```\n\n### Refusal Fallbacks (Claude Fable 5) — opt in by default\n\nFallbacks are **opt-in**: without them a refused request simply stops. Include the server-side `fallbacks` parameter in `claude-fable-5` code by default — on a policy decline the API re-runs the same request on the fallback model inside the same call. A decline before any output isn't billed (a mid-stream decline bills the streamed partial); the rescue bills at the fallback model's own rates, with cache repricing applied automatically.\n\n```typescript\nconst response = await client.beta.messages.create({\n  model: \"claude-fable-5\",\n  max_tokens: 16000,\n  betas: [\"server-side-fallback-2026-06-01\"],\n  fallbacks: [{ model: \"claude-opus-4-8\" }],\n  messages: [{ role: \"user\", content: \"...\" }],\n});\n\n// Switch points: one fallback block per model that ran and declined this turn\nfor (const block of response.content) {\n  if (block.type === \"fallback\") {\n    console.log(`${block.from.model} declined; ${block.to.model} continued`);\n  }\n}\n\n// Served-by signal — covers sticky turns, which carry no fallback block.\n// Pair with stop_reason: the fallback model can itself refuse.\nconst fallbackRan = (response.usage.iterations ?? []).some(\n  (entry) => entry.type === \"fallback_message\",\n);\nif (fallbackRan && response.stop_reason !== \"refusal\") {\n  console.log(`Served by ${response.model}`);\n}\n```\n\nA `stop_reason: \"refusal\"` on the final response means the whole chain refused. The header must be exactly `server-side-fallback-2026-06-01`; the parameter is rejected on the Batches API and unavailable on Amazon Bedrock, Vertex AI, and Microsoft Foundry — register the client-side `betaRefusalFallbackMiddleware` on the client there instead. Full semantics (sticky routing, billing, streaming, echoing fallback turns back): `shared/model-migration.md` → Migrating to Claude Fable 5 → `refusal` stop reason.\n\n---\n\n## Cost Optimization Strategies\n\n### 1. Use Prompt Caching for Repeated Context\n\n```typescript\n// Automatic caching (simplest — caches the last cacheable block)\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  cache_control: { type: \"ephemeral\" },\n  system: largeDocumentText, // e.g., 50KB of context\n  messages: [{ role: \"user\", content: \"Summarize the key points\" }],\n});\n\n// First request: full cost\n// Subsequent requests: ~90% cheaper for cached portion\n```\n\n### 2. Use Token Counting Before Requests\n\n```typescript\nconst countResponse = await client.messages.countTokens({\n  model: \"claude-opus-4-8\",\n  messages: messages,\n  system: system,\n});\n\nconst estimatedInputCost = countResponse.input_tokens * 0.000005; // $5/1M tokens\nconsole.log(`Estimated input cost: $${estimatedInputCost.toFixed(4)}`);\n```\n</doc>\n\n<doc path=\"typescript/claude-api/batches.md\">\n# Message Batches API — TypeScript\n\nThe Batches API (`POST /v1/messages/batches`) processes Messages API requests asynchronously at 50% of standard prices.\n\n## Key Facts\n\n- Up to 100,000 requests or 256 MB per batch\n- Most batches complete within 1 hour; maximum 24 hours\n- Results available for 29 days after creation\n- 50% cost reduction on all token usage\n- All Messages API features supported (vision, tools, caching, etc.)\n\n---\n\n## Create a Batch\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\n\nconst messageBatch = await client.messages.batches.create({\n  requests: [\n    {\n      custom_id: \"request-1\",\n      params: {\n        model: \"claude-opus-4-8\",\n        max_tokens: 16000,\n        messages: [\n          { role: \"user\", content: \"Summarize climate change impacts\" },\n        ],\n      },\n    },\n    {\n      custom_id: \"request-2\",\n      params: {\n        model: \"claude-opus-4-8\",\n        max_tokens: 16000,\n        messages: [\n          { role: \"user\", content: \"Explain quantum computing basics\" },\n        ],\n      },\n    },\n  ],\n});\n\nconsole.log(`Batch ID: ${messageBatch.id}`);\nconsole.log(`Status: ${messageBatch.processing_status}`);\n```\n\n---\n\n## Poll for Completion\n\n```typescript\nlet batch;\nwhile (true) {\n  batch = await client.messages.batches.retrieve(messageBatch.id);\n  if (batch.processing_status === \"ended\") break;\n  console.log(\n    `Status: ${batch.processing_status}, processing: ${batch.request_counts.processing}`,\n  );\n  await new Promise((resolve) => setTimeout(resolve, 60_000));\n}\n\nconsole.log(\"Batch complete!\");\nconsole.log(`Succeeded: ${batch.request_counts.succeeded}`);\nconsole.log(`Errored: ${batch.request_counts.errored}`);\n```\n\n---\n\n## Retrieve Results\n\n```typescript\nfor await (const result of await client.messages.batches.results(\n  messageBatch.id,\n)) {\n  switch (result.result.type) {\n    case \"succeeded\":\n      console.log(\n        `[${result.custom_id}] ${result.result.message.content[0].text.slice(0, 100)}`,\n      );\n      break;\n    case \"errored\":\n      if (result.result.error.type === \"invalid_request\") {\n        console.log(`[${result.custom_id}] Validation error - fix and retry`);\n      } else {\n        console.log(`[${result.custom_id}] Server error - safe to retry`);\n      }\n      break;\n    case \"expired\":\n      console.log(`[${result.custom_id}] Expired - resubmit`);\n      break;\n  }\n}\n```\n\n---\n\n## Cancel a Batch\n\n```typescript\nconst cancelled = await client.messages.batches.cancel(messageBatch.id);\nconsole.log(`Status: ${cancelled.processing_status}`); // \"canceling\"\n```\n</doc>\n\n<doc path=\"typescript/claude-api/files-api.md\">\n# Files API — TypeScript\n\nThe Files API uploads files for use in Messages API requests. Reference files via `file_id` in content blocks, avoiding re-uploads across multiple API calls.\n\n**Beta:** Pass `betas: [\"files-api-2025-04-14\"]` in your API calls (the SDK sets the required header automatically).\n\n## Key Facts\n\n- Maximum file size: 500 MB\n- Total storage: 100 GB per organization\n- Files persist until deleted\n- File operations (upload, list, delete) are free; content used in messages is billed as input tokens\n- Not available on Amazon Bedrock or Google Vertex AI\n\n---\n\n## Upload a File\n\n```typescript\nimport Anthropic, { toFile } from \"@anthropic-ai/sdk\";\nimport fs from \"fs\";\n\nconst client = new Anthropic();\n\nconst uploaded = await client.beta.files.upload({\n  file: await toFile(fs.createReadStream(\"report.pdf\"), undefined, {\n    type: \"application/pdf\",\n  }),\n  betas: [\"files-api-2025-04-14\"],\n});\n\nconsole.log(`File ID: ${uploaded.id}`);\nconsole.log(`Size: ${uploaded.size_bytes} bytes`);\n```\n\n---\n\n## Use a File in Messages\n\n### PDF / Text Document\n\n```typescript\nconst response = await client.beta.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: [\n        { type: \"text\", text: \"Summarize the key findings in this report.\" },\n        {\n          type: \"document\",\n          source: { type: \"file\", file_id: uploaded.id },\n          title: \"Q4 Report\",\n          citations: { enabled: true },\n        },\n      ],\n    },\n  ],\n  betas: [\"files-api-2025-04-14\"],\n});\n\nconsole.log(response.content[0].text);\n```\n\n---\n\n## Manage Files\n\n### List Files\n\n```typescript\nconst files = await client.beta.files.list({\n  betas: [\"files-api-2025-04-14\"],\n});\nfor (const f of files.data) {\n  console.log(`${f.id}: ${f.filename} (${f.size_bytes} bytes)`);\n}\n```\n\n### Delete a File\n\n```typescript\nawait client.beta.files.delete(\"file_011CNha8iCJcU1wXNR6q4V8w\", {\n  betas: [\"files-api-2025-04-14\"],\n});\n```\n\n### Download a File\n\n```typescript\nconst response = await client.beta.files.download(\n  \"file_011CNha8iCJcU1wXNR6q4V8w\",\n  { betas: [\"files-api-2025-04-14\"] },\n);\nconst content = Buffer.from(await response.arrayBuffer());\nawait fs.promises.writeFile(\"output.txt\", content);\n```\n</doc>\n\n<doc path=\"typescript/claude-api/streaming.md\">\n# Streaming — TypeScript\n\n## Quick Start\n\n```typescript\nconst stream = client.messages.stream({\n  model: \"claude-opus-4-8\",\n  max_tokens: 64000,\n  messages: [{ role: \"user\", content: \"Write a story\" }],\n});\n\nfor await (const event of stream) {\n  if (\n    event.type === \"content_block_delta\" &&\n    event.delta.type === \"text_delta\"\n  ) {\n    process.stdout.write(event.delta.text);\n  }\n}\n```\n\n---\n\n## Handling Different Content Types\n\n> **Fable 5 / Opus 4.8 / Opus 4.7 / Opus 4.6:** Use `thinking: {type: \"adaptive\"}`. On older models, use `thinking: {type: \"enabled\", budget_tokens: N}` instead.\n\n```typescript\nconst stream = client.messages.stream({\n  model: \"claude-opus-4-8\",\n  max_tokens: 64000,\n  thinking: { type: \"adaptive\", display: \"summarized\" }, // display opt-in: default is omitted (empty thinking text) on Fable 5 / Mythos 5 / Opus 4.8 / 4.7\n  messages: [{ role: \"user\", content: \"Analyze this problem\" }],\n});\n\nfor await (const event of stream) {\n  switch (event.type) {\n    case \"content_block_start\":\n      switch (event.content_block.type) {\n        case \"thinking\":\n          console.log(\"\\n[Thinking...]\");\n          break;\n        case \"text\":\n          console.log(\"\\n[Response:]\");\n          break;\n      }\n      break;\n    case \"content_block_delta\":\n      switch (event.delta.type) {\n        case \"thinking_delta\":\n          process.stdout.write(event.delta.thinking);\n          break;\n        case \"text_delta\":\n          process.stdout.write(event.delta.text);\n          break;\n      }\n      break;\n  }\n}\n```\n\n---\n\n## Streaming with Tool Use (Tool Runner)\n\nUse the tool runner with `stream: true`. The outer loop iterates over tool runner iterations (messages), the inner loop processes stream events:\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\nimport { betaZodTool } from \"@anthropic-ai/sdk/helpers/beta/zod\";\nimport { z } from \"zod\";\n\nconst client = new Anthropic();\n\nconst getWeather = betaZodTool({\n  name: \"get_weather\",\n  description: \"Get current weather for a location\",\n  inputSchema: z.object({\n    location: z.string().describe(\"City and state, e.g., San Francisco, CA\"),\n  }),\n  run: async ({ location }) => `72°F and sunny in ${location}`,\n});\n\nconst runner = client.beta.messages.toolRunner({\n  model: \"claude-opus-4-8\",\n  max_tokens: 64000,\n  tools: [getWeather],\n  messages: [\n    { role: \"user\", content: \"What's the weather in Paris and London?\" },\n  ],\n  stream: true,\n});\n\n// Outer loop: each tool runner iteration\nfor await (const messageStream of runner) {\n  // Inner loop: stream events for this iteration\n  for await (const event of messageStream) {\n    switch (event.type) {\n      case \"content_block_delta\":\n        switch (event.delta.type) {\n          case \"text_delta\":\n            process.stdout.write(event.delta.text);\n            break;\n          case \"input_json_delta\":\n            // Tool input being streamed\n            break;\n        }\n        break;\n    }\n  }\n}\n```\n\n---\n\n## Getting the Final Message\n\n```typescript\nconst stream = client.messages.stream({\n  model: \"claude-opus-4-8\",\n  max_tokens: 64000,\n  messages: [{ role: \"user\", content: \"Hello\" }],\n});\n\nfor await (const event of stream) {\n  // Process events...\n}\n\nconst finalMessage = await stream.finalMessage();\nconsole.log(`Tokens used: ${finalMessage.usage.output_tokens}`);\n```\n\n---\n\n## Stream Event Types\n\n| Event Type            | Description                 | When it fires                     |\n| --------------------- | --------------------------- | --------------------------------- |\n| `message_start`       | Contains message metadata   | Once at the beginning             |\n| `content_block_start` | New content block beginning | When a text/tool_use block starts |\n| `content_block_delta` | Incremental content update  | For each token/chunk              |\n| `content_block_stop`  | Content block complete      | When a block finishes             |\n| `message_delta`       | Message-level updates       | Contains `stop_reason`, usage     |\n| `message_stop`        | Message complete            | Once at the end                   |\n\n## Best Practices\n\n1. **Always flush output** — Use `process.stdout.write()` for immediate display\n2. **Handle partial responses** — If the stream is interrupted, you may have incomplete content\n3. **Track token usage** — The `message_delta` event contains usage information\n4. **Use `finalMessage()`** — Get the complete `Anthropic.Message` object even when streaming. Don't wrap `.on()` events in `new Promise()` — `finalMessage()` handles all completion/error/abort states internally\n5. **Buffer for web UIs** — Consider buffering a few tokens before rendering to avoid excessive DOM updates\n6. **Use `stream.on(\"text\", ...)` for deltas** — The `text` event provides just the delta string, simpler than manually filtering `content_block_delta` events\n7. **For agentic loops with streaming** — See the [Streaming Manual Loop](./tool-use.md#streaming-manual-loop) section in tool-use.md for combining `stream()` + `finalMessage()` with a tool-use loop\n\n## Raw SSE Format\n\nIf using raw HTTP (not SDKs), the stream returns Server-Sent Events:\n\n```\nevent: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_...\",\"type\":\"message\",...}}\n\nevent: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}\n\nevent: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"Hello\"}}\n\nevent: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\nevent: message_delta\ndata: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":12}}\n\nevent: message_stop\ndata: {\"type\":\"message_stop\"}\n```\n</doc>\n\n<doc path=\"typescript/claude-api/tool-use.md\">\n# Tool Use — TypeScript\n\nFor conceptual overview (tool definitions, tool choice, tips), see [shared/tool-use-concepts.md](../../shared/tool-use-concepts.md).\n\n## Tool Runner (Recommended)\n\n**Beta:** The tool runner is in beta in the TypeScript SDK.\n\nUse `betaZodTool` with Zod schemas to define tools with a `run` function, then pass them to `client.beta.messages.toolRunner()`:\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\nimport { betaZodTool } from \"@anthropic-ai/sdk/helpers/beta/zod\";\nimport { z } from \"zod\";\n\nconst client = new Anthropic();\n\nconst getWeather = betaZodTool({\n  name: \"get_weather\",\n  description: \"Get current weather for a location\",\n  inputSchema: z.object({\n    location: z.string().describe(\"City and state, e.g., San Francisco, CA\"),\n    unit: z.enum([\"celsius\", \"fahrenheit\"]).optional(),\n  }),\n  run: async (input) => {\n    // Your implementation here\n    return `72°F and sunny in ${input.location}`;\n  },\n});\n\n// The tool runner handles the agentic loop and returns the final message\nconst finalMessage = await client.beta.messages.toolRunner({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: [getWeather],\n  messages: [{ role: \"user\", content: \"What's the weather in Paris?\" }],\n});\n\nconsole.log(finalMessage.content);\n```\n\n**Key benefits of the tool runner:**\n\n- No manual loop — the SDK handles calling tools and feeding results back\n- Type-safe tool inputs via Zod schemas\n- Tool schemas are generated automatically from Zod definitions\n- Iteration stops automatically when Claude has no more tool calls\n\n---\n\n## Manual Agentic Loop\n\nUse this when you need fine-grained control (custom logging, conditional tool execution, streaming individual iterations, human-in-the-loop approval):\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\nconst tools: Anthropic.Tool[] = [...]; // Your tool definitions\nlet messages: Anthropic.MessageParam[] = [{ role: \"user\", content: userInput }];\n\nwhile (true) {\n  const response = await client.messages.create({\n    model: \"claude-opus-4-8\",\n    max_tokens: 16000,\n    tools: tools,\n    messages: messages,\n  });\n\n  if (response.stop_reason === \"end_turn\") break;\n\n  // Server-side tool hit iteration limit; append assistant turn and re-send to continue\n  if (response.stop_reason === \"pause_turn\") {\n    messages.push({ role: \"assistant\", content: response.content });\n    continue;\n  }\n\n  const toolUseBlocks = response.content.filter(\n    (b): b is Anthropic.ToolUseBlock => b.type === \"tool_use\",\n  );\n\n  messages.push({ role: \"assistant\", content: response.content });\n\n  const toolResults: Anthropic.ToolResultBlockParam[] = [];\n  for (const tool of toolUseBlocks) {\n    const result = await executeTool(tool.name, tool.input);\n    toolResults.push({\n      type: \"tool_result\",\n      tool_use_id: tool.id,\n      content: result,\n    });\n  }\n\n  messages.push({ role: \"user\", content: toolResults });\n}\n```\n\n### Streaming Manual Loop\n\nUse `client.messages.stream()` + `finalMessage()` instead of `.create()` when you need streaming within a manual loop. Text deltas are streamed on each iteration; `finalMessage()` collects the complete `Message` so you can inspect `stop_reason` and extract tool-use blocks:\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\nconst tools: Anthropic.Tool[] = [...];\nlet messages: Anthropic.MessageParam[] = [{ role: \"user\", content: userInput }];\n\nwhile (true) {\n  const stream = client.messages.stream({\n    model: \"claude-opus-4-8\",\n    max_tokens: 64000,\n    tools,\n    messages,\n  });\n\n  // Stream text deltas on each iteration\n  stream.on(\"text\", (delta) => {\n    process.stdout.write(delta);\n  });\n\n  // finalMessage() resolves with the complete Message — no need to\n  // manually wire up .on(\"message\") / .on(\"error\") / .on(\"abort\")\n  const message = await stream.finalMessage();\n\n  if (message.stop_reason === \"end_turn\") break;\n\n  // Server-side tool hit iteration limit; append assistant turn and re-send to continue\n  if (message.stop_reason === \"pause_turn\") {\n    messages.push({ role: \"assistant\", content: message.content });\n    continue;\n  }\n\n  const toolUseBlocks = message.content.filter(\n    (b): b is Anthropic.ToolUseBlock => b.type === \"tool_use\",\n  );\n\n  messages.push({ role: \"assistant\", content: message.content });\n\n  const toolResults: Anthropic.ToolResultBlockParam[] = [];\n  for (const tool of toolUseBlocks) {\n    const result = await executeTool(tool.name, tool.input);\n    toolResults.push({\n      type: \"tool_result\",\n      tool_use_id: tool.id,\n      content: result,\n    });\n  }\n\n  messages.push({ role: \"user\", content: toolResults });\n}\n```\n\n> **Important:** Don't wrap `.on()` events in `new Promise()` to collect the final message — use `stream.finalMessage()` instead. The SDK handles all error/abort/completion states internally.\n\n> **Error handling in the loop:** Use the SDK's typed exceptions (e.g., `Anthropic.RateLimitError`, `Anthropic.APIError`) — see [Error Handling](./README.md#error-handling) for examples. Don't check error messages with string matching.\n\n> **SDK types:** Use `Anthropic.MessageParam`, `Anthropic.Tool`, `Anthropic.ToolUseBlock`, `Anthropic.ToolResultBlockParam`, `Anthropic.Message`, etc. for all API-related data structures. Don't redefine equivalent interfaces.\n\n---\n\n## Handling Tool Results\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: tools,\n  messages: [{ role: \"user\", content: \"What's the weather in Paris?\" }],\n});\n\nfor (const block of response.content) {\n  if (block.type === \"tool_use\") {\n    const result = await executeTool(block.name, block.input);\n\n    const followup = await client.messages.create({\n      model: \"claude-opus-4-8\",\n      max_tokens: 16000,\n      tools: tools,\n      messages: [\n        { role: \"user\", content: \"What's the weather in Paris?\" },\n        { role: \"assistant\", content: response.content },\n        {\n          role: \"user\",\n          content: [\n            { type: \"tool_result\", tool_use_id: block.id, content: result },\n          ],\n        },\n      ],\n    });\n  }\n}\n```\n\n---\n\n## Tool Choice\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: tools,\n  tool_choice: { type: \"tool\", name: \"get_weather\" },\n  messages: [{ role: \"user\", content: \"What's the weather in Paris?\" }],\n});\n```\n\n---\n\n## Anthropic-Defined Tools\n\nVersion-suffixed `type` literals; `name` is fixed per interface. Web search and code execution are server-executed; bash and text editor are client-executed (you handle the `tool_use` locally — see `shared/tool-use-concepts.md`). Pass plain object literals — the `ToolUnion` type is satisfied structurally. **The `name`/`type` pair must match the interface**: mixing `str_replace_based_edit_tool` (20250728 name) with `text_editor_20250124` (which expects `str_replace_editor`) is a TS2322.\n\n**Don't type-annotate as `Tool[]`** — `Tool` is just the custom-tool variant. Let structural typing infer from the `tools` param, or annotate as `Anthropic.Messages.ToolUnion[]` if you must:\n\n```typescript\n// ✓ let inference work — no annotation\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: [\n    { type: \"text_editor_20250728\", name: \"str_replace_based_edit_tool\" },\n    { type: \"bash_20250124\", name: \"bash\" },\n    { type: \"web_search_20260209\", name: \"web_search\" },\n    { type: \"code_execution_20260120\", name: \"code_execution\" },\n  ],\n  messages: [{ role: \"user\", content: \"...\" }],\n});\n\n// ✗ this is a TS2352 — Tool is the CUSTOM tool variant only\n// const tools: Anthropic.Tool[] = [{ type: \"text_editor_20250728\", ... }]\n```\n\n| Interface | `name` | `type` |\n|---|---|---|\n| `ToolTextEditor20250124` | `str_replace_editor` | `text_editor_20250124` |\n| `ToolTextEditor20250429` | `str_replace_based_edit_tool` | `text_editor_20250429` |\n| `ToolTextEditor20250728` | `str_replace_based_edit_tool` | `text_editor_20250728` |\n| `ToolBash20250124` | `bash` | `bash_20250124` |\n| `WebSearchTool20260209` | `web_search` | `web_search_20260209` |\n| `WebFetchTool20260209` | `web_fetch` | `web_fetch_20260209` |\n| `CodeExecutionTool20260120` | `code_execution` | `code_execution_20260120` |\n\n**Don't mix beta and non-beta types**: if you call `client.beta.messages.create()`, the response `content` is `BetaContentBlock[]` — you cannot pass that to a non-beta `ContentBlockParam[]` without narrowing each element.\n\n---\n\n\n## Code Execution\n\n### Basic Usage\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\nconst client = new Anthropic();\n\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content:\n        \"Calculate the mean and standard deviation of [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\",\n    },\n  ],\n  tools: [{ type: \"code_execution_20260120\", name: \"code_execution\" }],\n});\n```\n\n### Reading Local Files (ESM note)\n\n`__dirname` doesn't exist in ES modules. For script-relative paths use `import.meta.url`:\n\n```typescript\nimport { readFileSync } from \"fs\";\nimport { fileURLToPath } from \"url\";\nimport { dirname, join } from \"path\";\n\nconst __dirname = dirname(fileURLToPath(import.meta.url));\nconst pdfBytes = readFileSync(join(__dirname, \"sample.pdf\"));\n```\n\nOr use a CWD-relative path if the script runs from a known directory: `readFileSync(\"./sample.pdf\")`.\n\n### Upload Files for Analysis\n\n```typescript\nimport Anthropic, { toFile } from \"@anthropic-ai/sdk\";\nimport { createReadStream } from \"fs\";\n\nconst client = new Anthropic();\n\n// 1. Upload a file\nconst uploaded = await client.beta.files.upload({\n  file: await toFile(createReadStream(\"sales_data.csv\"), undefined, {\n    type: \"text/csv\",\n  }),\n  betas: [\"files-api-2025-04-14\"],\n});\n\n// 2. Pass to code execution\n// Code execution is GA; Files API is still beta (pass via RequestOptions)\nconst response = await client.messages.create(\n  {\n    model: \"claude-opus-4-8\",\n    max_tokens: 16000,\n    messages: [\n      {\n        role: \"user\",\n        content: [\n          {\n            type: \"text\",\n            text: \"Analyze this sales data. Show trends and create a visualization.\",\n          },\n          { type: \"container_upload\", file_id: uploaded.id },\n        ],\n      },\n    ],\n    tools: [{ type: \"code_execution_20260120\", name: \"code_execution\" }],\n  },\n  { headers: { \"anthropic-beta\": \"files-api-2025-04-14\" } },\n);\n```\n\n### Retrieve Generated Files\n\n```typescript\nimport path from \"path\";\nimport fs from \"fs\";\n\nconst OUTPUT_DIR = \"./claude_outputs\";\nawait fs.promises.mkdir(OUTPUT_DIR, { recursive: true });\n\nfor (const block of response.content) {\n  if (block.type === \"bash_code_execution_tool_result\") {\n    const result = block.content;\n    if (result.type === \"bash_code_execution_result\" && result.content) {\n      for (const fileRef of result.content) {\n        if (fileRef.type === \"bash_code_execution_output\") {\n          const metadata = await client.beta.files.retrieveMetadata(\n            fileRef.file_id,\n          );\n          const downloadResponse = await client.beta.files.download(fileRef.file_id);\n          const fileBytes = Buffer.from(await downloadResponse.arrayBuffer());\n          const safeName = path.basename(metadata.filename);\n          if (!safeName || safeName === \".\" || safeName === \"..\") {\n            console.warn(`Skipping invalid filename: ${metadata.filename}`);\n            continue;\n          }\n          const outputPath = path.join(OUTPUT_DIR, safeName);\n          await fs.promises.writeFile(outputPath, fileBytes);\n          console.log(`Saved: ${outputPath}`);\n        }\n      }\n    }\n  }\n}\n```\n\n### Container Reuse\n\n```typescript\n// First request: set up environment\nconst response1 = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: \"Install tabulate and create data.json with sample user data\",\n    },\n  ],\n  tools: [{ type: \"code_execution_20260120\", name: \"code_execution\" }],\n});\n\n// Reuse container\n// container is nullable — set only when using server-side code execution\nconst containerId = response1.container!.id;\n\nconst response2 = await client.messages.create({\n  container: containerId,\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: \"Read data.json and display as a formatted table\",\n    },\n  ],\n  tools: [{ type: \"code_execution_20260120\", name: \"code_execution\" }],\n});\n```\n\n---\n\n## Memory Tool\n\n### Basic Usage\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: \"Remember that my preferred language is TypeScript.\",\n    },\n  ],\n  tools: [{ type: \"memory_20250818\", name: \"memory\" }],\n});\n```\n\n### SDK Memory Helper\n\nUse `betaMemoryTool` with a `MemoryToolHandlers` implementation:\n\n```typescript\nimport {\n  betaMemoryTool,\n  type MemoryToolHandlers,\n} from \"@anthropic-ai/sdk/helpers/beta/memory\";\n\nconst handlers: MemoryToolHandlers = {\n  async view(command) { ... },\n  async create(command) { ... },\n  async str_replace(command) { ... },\n  async insert(command) { ... },\n  async delete(command) { ... },\n  async rename(command) { ... },\n};\n\nconst memory = betaMemoryTool(handlers);\n\nconst runner = client.beta.messages.toolRunner({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  tools: [memory],\n  messages: [{ role: \"user\", content: \"Remember my preferences\" }],\n});\n\nfor await (const message of runner) {\n  console.log(message);\n}\n```\n\nFor full implementation examples, use WebFetch:\n\n- `https://github.com/anthropics/anthropic-sdk-typescript/blob/main/examples/tools-helpers-memory.ts`\n\n---\n\n## Structured Outputs\n\n### JSON Outputs (Zod — Recommended)\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\nimport { z } from \"zod\";\nimport { zodOutputFormat } from \"@anthropic-ai/sdk/helpers/zod\";\n\nconst ContactInfoSchema = z.object({\n  name: z.string(),\n  email: z.string(),\n  plan: z.string(),\n  interests: z.array(z.string()),\n  demo_requested: z.boolean(),\n});\n\nconst client = new Anthropic();\n\nconst response = await client.messages.parse({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content:\n        \"Extract: Jane Doe (jane@co.com) wants Enterprise, interested in API and SDKs, wants a demo.\",\n    },\n  ],\n  output_config: {\n    format: zodOutputFormat(ContactInfoSchema),\n  },\n});\n\n// parsed_output is null if parsing failed — assert or guard\nconsole.log(response.parsed_output!.name); // \"Jane Doe\"\n```\n\n### Strict Tool Use\n\n```typescript\nconst response = await client.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  messages: [\n    {\n      role: \"user\",\n      content: \"Book a flight to Tokyo for 2 passengers on March 15\",\n    },\n  ],\n  tools: [\n    {\n      name: \"book_flight\",\n      description: \"Book a flight to a destination\",\n      strict: true,\n      input_schema: {\n        type: \"object\",\n        properties: {\n          destination: { type: \"string\" },\n          date: { type: \"string\", format: \"date\" },\n          passengers: {\n            type: \"integer\",\n            enum: [1, 2, 3, 4, 5, 6, 7, 8],\n          },\n        },\n        required: [\"destination\", \"date\", \"passengers\"],\n        additionalProperties: false,\n      },\n    },\n  ],\n});\n```\n\n---\n\n## Agent Skills\n\nEnable an Anthropic-managed skill (e.g., `pptx`) via `container.skills` + the `code_execution` tool on the beta path. Both beta headers are required. Outputs land as files in the response content — download by file ID via the Files API.\n\n```typescript\nconst response = await client.beta.messages.create({\n  model: \"claude-opus-4-8\",\n  max_tokens: 16000,\n  container: {\n    skills: [{ type: \"anthropic\", skill_id: \"pptx\", version: \"latest\" }],\n  },\n  tools: [{ type: \"code_execution_20260521\", name: \"code_execution\" }],\n  betas: [\"code-execution-2025-08-25\", \"skills-2025-10-02\"],\n  messages: [{ role: \"user\", content: \"Create a 3-slide deck about X.\" }],\n});\n// Find the file_id in response.content, then:\n// await client.beta.files.download(fileId)\n```\n</doc>\n\n<doc path=\"typescript/managed-agents/README.md\">\n# Managed Agents — TypeScript\n\n> **Bindings not shown here:** This README covers the most common managed-agents flows for TypeScript. If you need a class, method, namespace, field, or behavior that isn't shown, WebFetch the TypeScript SDK repo **or the relevant docs page** from `shared/live-sources.md` rather than guess. Do not extrapolate from cURL shapes or another language's SDK.\n\n> **Agents are persistent — create once, reference by ID.** Store the agent ID returned by `agents.create` and pass it to every subsequent `sessions.create`; do not call `agents.create` in the request path. The Anthropic CLI is one convenient way to create agents and environments from version-controlled YAML — its URL is in `shared/live-sources.md`. The examples below show in-code creation for completeness; in production the create call belongs in setup, not in the request path.\n\n## Installation\n\n```bash\nnpm install @anthropic-ai/sdk\n```\n\n## Client Initialization\n\n```typescript\nimport Anthropic from \"@anthropic-ai/sdk\";\n\n// Default — resolves credentials from the environment:\n// ANTHROPIC_API_KEY, or ANTHROPIC_AUTH_TOKEN, or an `ant auth login` profile.\n// Prefer this for local dev; don't hardcode a key.\nconst client = new Anthropic();\n\n// Explicit API key (only when you must inject a specific key)\nconst client = new Anthropic({ apiKey: \"your-api-key\" });\n```\n\n---\n\n## Create an Environment\n\n```typescript\nconst environment = await client.beta.environments.create(\n  {\n    name: \"my-dev-env\",\n    config: {\n      type: \"cloud\",\n      networking: { type: \"unrestricted\" },\n    },\n  },\n);\nconsole.log(environment.id); // env_...\n```\n\n---\n\n## Create an Agent (required first step)\n\n> ⚠️ **There is no inline agent config.** `model`/`system`/`tools` live on the agent object, not the session. Always start with `agents.create()` — the session only takes `agent: { type: \"agent\", id: agent.id }`.\n\n### Minimal\n\n```typescript\n// 1. Create the agent (reusable, versioned)\nconst agent = await client.beta.agents.create(\n  {\n    name: \"Coding Assistant\",\n    model: \"claude-opus-4-8\",\n    tools: [{ type: \"agent_toolset_20260401\", default_config: { enabled: true } }],\n  },\n);\n\n// 2. Start a session\nconst session = await client.beta.sessions.create(\n  {\n    agent: { type: \"agent\", id: agent.id, version: agent.version },\n    environment_id: environment.id,\n  },\n);\nconsole.log(session.id, session.status);\nconsole.log(`Trace: https://platform.claude.com/workspaces/default/sessions/${session.id}`);\n```\n\n### With system prompt and custom tools\n\n```typescript\nconst agent = await client.beta.agents.create(\n  {\n    name: \"Code Reviewer\",\n    model: \"claude-opus-4-8\",\n    system: \"You are a senior code reviewer.\",\n    tools: [\n      { type: \"agent_toolset_20260401\", default_config: { enabled: true } },\n      {\n        type: \"custom\",\n        name: \"run_tests\",\n        description: \"Run the test suite\",\n        input_schema: {\n          type: \"object\",\n          properties: {\n            test_path: { type: \"string\", description: \"Path to test file\" },\n          },\n          required: [\"test_path\"],\n        },\n      },\n    ],\n  },\n);\n\nconst session = await client.beta.sessions.create(\n  {\n    agent: { type: \"agent\", id: agent.id, version: agent.version },\n    environment_id: environment.id,\n    title: \"Code review session\",\n    resources: [\n      {\n        type: \"github_repository\",\n        url: \"https://github.com/owner/repo\",\n        mount_path: \"/workspace/repo\",\n        authorization_token: process.env.GITHUB_TOKEN,\n        branch: \"main\",\n      },\n    ],\n  },\n);\n```\n\n---\n\n## Send a User Message\n\n```typescript\nawait client.beta.sessions.events.send(\n  session.id,\n  {\n    events: [\n      {\n        type: \"user.message\",\n        content: [{ type: \"text\", text: \"Review the auth module\" }],\n      },\n    ],\n  },\n);\n```\n\n> 💡 **Stream-first:** Open the stream *before* (or concurrently with) sending the message. The stream only delivers events that occur after it opens — stream-after-send means early events arrive buffered in one batch. See [Steering Patterns](../../shared/managed-agents-events.md#steering-patterns).\n\n---\n\n## Stream Events (SSE)\n\n```typescript\n// Stream-first: open stream and send concurrently\nconst [events] = await Promise.all([\n  collectStream(session.id),\n  client.beta.sessions.events.send(\n    session.id,\n    { events: [{ type: \"user.message\", content: [{ type: \"text\", text: \"...\" }] }] },\n  ),\n]);\n\n// Standalone stream iteration:\nconst stream = await client.beta.sessions.events.stream(\n  session.id,\n);\n\nfor await (const event of stream) {\n  switch (event.type) {\n    case \"agent.message\":\n      for (const block of event.content) {\n        if (block.type === \"text\") {\n          process.stdout.write(block.text);\n        }\n      }\n      break;\n    case \"agent.custom_tool_use\":\n      // Custom tool invocation — session is now idle\n      console.log(`\\nCustom tool call: ${event.name}`);\n      console.log(`Input: ${JSON.stringify(event.input)}`);\n      break;\n    case \"session.status_idle\":\n      console.log(\"\\n--- Agent idle ---\");\n      break;\n    case \"session.status_terminated\":\n      console.log(\"\\n--- Session terminated ---\");\n      break;\n  }\n}\n```\n\n---\n\n## Provide Custom Tool Result\n\n```typescript\nawait client.beta.sessions.events.send(\n  session.id,\n  {\n    events: [\n      {\n        type: \"user.custom_tool_result\",\n        custom_tool_use_id: \"sevt_abc123\",\n        content: [{ type: \"text\", text: \"All 42 tests passed.\" }],\n      },\n    ],\n  },\n);\n```\n\n---\n\n## Poll Events\n\n```typescript\nconst events = await client.beta.sessions.events.list(\n  session.id,\n);\nfor (const event of events.data) {\n  console.log(`${event.type}: ${event.id}`);\n}\n```\n\n---\n\n## Full Streaming Loop with Custom Tools\n\n```typescript\nfunction runCustomTool(toolName: string, toolInput: unknown): string {\n  if (toolName === \"run_tests\") {\n    // Your tool implementation here\n    return \"All tests passed.\";\n  }\n  return `Unknown tool: ${toolName}`;\n}\n\nasync function runSession(client: Anthropic, sessionId: string) {\n  while (true) {\n    const stream = await client.beta.sessions.events.stream(\n      sessionId,\n    );\n\n    const toolCalls: Anthropic.Beta.Sessions.BetaManagedAgentsAgentCustomToolUseEvent[] = [];\n\n    for await (const event of stream) {\n      if (event.type === \"agent.message\") {\n        for (const block of event.content) {\n          if (block.type === \"text\") {\n            process.stdout.write(block.text);\n          }\n        }\n      } else if (event.type === \"agent.custom_tool_use\") {\n        toolCalls.push(event);\n      } else if (event.type === \"session.status_idle\") {\n        break;\n      } else if (event.type === \"session.status_terminated\") {\n        return;\n      }\n    }\n\n    if (toolCalls.length === 0) break;\n\n    // Process custom tool calls\n    const results = toolCalls.map((call) => ({\n      type: \"user.custom_tool_result\" as const,\n      custom_tool_use_id: call.id,\n      content: [{ type: \"text\" as const, text: runCustomTool(call.name, call.input) }],\n    }));\n\n    await client.beta.sessions.events.send(\n      sessionId,\n      { events: results },\n    );\n  }\n}\n```\n\n---\n\n## Upload a File\n\n```typescript\nimport fs from \"fs\";\n\nconst file = await client.beta.files.upload({\n  file: fs.createReadStream(\"data.csv\"),\n  purpose: \"agent\",\n});\n\n// Use in a session\nconst session = await client.beta.sessions.create(\n  {\n    agent: { type: \"agent\", id: agent.id, version: agent.version },\n    environment_id: environment.id,\n    resources: [{ type: \"file\", file_id: file.id, mount_path: \"/workspace/data.csv\" }],\n  },\n);\n```\n\n---\n\n## List and Download Session Files\n\nList files the agent wrote to `/mnt/session/outputs/` during a session, then download them.\n\n```typescript\nimport fs from \"fs\";\n\n// List files associated with a session\nconst files = await client.beta.files.list({\n  scope_id: session.id,\n  betas: [\"managed-agents-2026-04-01\"],\n});\nfor (const f of files.data) {\n  console.log(f.filename, f.size_bytes);\n\n  // Download and save to disk\n  const resp = await client.beta.files.download(f.id);\n  const buffer = Buffer.from(await resp.arrayBuffer());\n  fs.writeFileSync(f.filename, buffer);\n}\n```\n\n> 💡 There's a brief indexing lag (~1–3s) between `session.status_idle` and output files appearing in `files.list`. Retry once or twice if the list is empty.\n\n---\n\n## Session Management\n\n```typescript\n// Get session details\nconst session = await client.beta.sessions.retrieve(\"sesn_011CZxAbc123Def456\");\nconsole.log(session.status, session.usage);\n\n// List sessions\nconst sessions = await client.beta.sessions.list();\n\n// Delete a session\nawait client.beta.sessions.delete(\"sesn_011CZxAbc123Def456\");\n\n// Archive a session\nawait client.beta.sessions.archive(\"sesn_011CZxAbc123Def456\");\n```\n\n---\n\n## MCP Server Integration\n\n```typescript\n// Agent declares MCP server (no auth here — auth goes in a vault)\nconst agent = await client.beta.agents.create({\n  name: \"MCP Agent\",\n  model: \"claude-opus-4-8\",\n  mcp_servers: [\n    { type: \"url\", name: \"my-tools\", url: \"https://my-mcp-server.example.com/sse\" },\n  ],\n  tools: [\n    { type: \"agent_toolset_20260401\", default_config: { enabled: true } },\n    { type: \"mcp_toolset\", mcp_server_name: \"my-tools\" },\n  ],\n});\n\n// Session attaches vault(s) containing credentials for those MCP server URLs\nconst session = await client.beta.sessions.create({\n  agent: agent.id,\n  environment_id: environment.id,\n  vault_ids: [vault.id],\n});\n```\n\nSee `shared/managed-agents-tools.md` §Vaults for creating vaults and adding credentials.\n</doc>\n\n## When to Use WebFetch\n\nUse WebFetch to get the latest documentation when:\n\n- User asks for \"latest\" or \"current\" information\n- Cached data seems incorrect\n- User asks about features not covered here\n\nLive documentation URLs are in `shared/live-sources.md`.\n\n## Common Pitfalls\n\n- **No `ANTHROPIC_API_KEY` ≠ no credentials.** Don't bail or ask the user for a key just because the env var is unset — run `ant auth status` first. After `ant auth login`, a bare `Anthropic()` client and `ant …` work with no env var; for raw curl, use `Authorization: Bearer $(ant auth print-credentials --access-token)` plus header `anthropic-beta: oauth-2025-04-20`. See the Authentication quick reference above and `shared/anthropic-cli.md`.\n- Don't truncate inputs when passing files or content to the API. If the content is too long to fit in the context window, notify the user and discuss options (chunking, summarization, etc.) rather than silently truncating.\n- **Fable 5 / Sonnet 5 / Opus 4.8 / 4.7 thinking:** Adaptive only. `thinking: {type: \"enabled\", budget_tokens: N}` returns 400 — `budget_tokens` is fully removed (along with `temperature`, `top_p`, `top_k`). Use `thinking: {type: \"adaptive\"}`. Opus 4.8 inherits this surface from 4.7 with no new breaking changes; Fable 5 adds one — an explicit `thinking: {type: \"disabled\"}` returns a 400 (accepted on Sonnet 5 / 4.7 / 4.8); omit the param instead.\n- **Opus 4.6 / Sonnet 4.6 thinking:** Use `thinking: {type: \"adaptive\"}` — do NOT use `budget_tokens` for new 4.6 code (deprecated on both Opus 4.6 and Sonnet 4.6; for gradual migration of existing code, see the transitional escape hatch in `shared/model-migration.md` — note this carve-out does not apply to Fable 5, Opus 4.7 or 4.8). For older models, `budget_tokens` must be less than `max_tokens` (minimum 1024). This will throw an error if you get it wrong.\n- **Prefill removed (Fable 5 and the 4.6/4.7/4.8 family):** Assistant message prefills (last-assistant-turn prefills) return a 400 error on Fable 5, Opus 4.6, Opus 4.7, Opus 4.8, and Sonnet 4.6. Use structured outputs (`output_config.format`) or system prompt instructions to control response format instead. (One exception: the fallback-credit prefill claim — when redeeming a credit with `fallback_has_prefill_claim: true`, the server accepts the echoed assistant message; see the migration guide's refusal section.)\n- **Fable 5 `refusal` stop reason:** Safety classifiers may decline a request — a successful HTTP 200 with `stop_reason: \"refusal\"` (pre-output: empty `content`, nothing billed; mid-stream: partial output billed — discard it). Check `stop_reason` before reading `response.content[0]`, or you'll hit index errors on refused requests. To retry on another model, replay the history as-is — other models drop the refused model's thinking blocks from the prompt, unbilled; no stripping needed (and a fallback-credit redemption must echo the refused body exactly anyway, thinking blocks included). Fallbacks are **opt-in** — new `claude-fable-5` code should include the server-side `fallbacks` parameter by default so a refusal doesn't fail the request outright; see the Claude Fable 5 section above.\n- **Fable 5 tokenizer:** Same tokenizer as Opus 4.8 — token counts are roughly unchanged when migrating from Opus 4.7/4.8. Coming from Opus 4.6, Sonnet, Haiku, or older, token counts differ (the Opus 4.7 tokenizer uses ~1×–1.35× as many tokens) — re-measure by calling `count_tokens` once with each model and comparing `input_tokens`.\n- **Confirm migration scope before editing:** When a user asks to migrate code to a newer Claude model without naming a specific file, directory, or file list, **ask which scope to apply first** — the entire working directory, a specific subdirectory, or a specific set of files. Do not start editing until the user confirms. Imperative phrasings like \"migrate my codebase\", \"move my project to X\", \"upgrade to Sonnet 4.6\", or bare \"migrate to Opus 4.8\" are **still ambiguous** — they tell you what to do but not where, so ask. Proceed without asking only when the prompt names an exact file, a specific directory, or an explicit file list (\"migrate `app.py`\", \"migrate everything under `services/`\", \"update `a.py` and `b.py`\"). See `shared/model-migration.md` Step 0.\n- **`max_tokens` defaults:** Don't lowball `max_tokens` — hitting the cap truncates output mid-thought and requires a retry. For non-streaming requests, default to `~16000` (keeps responses under SDK HTTP timeouts). For streaming requests, default to `~64000` (timeouts aren't a concern, so give the model room). Only go lower when you have a hard reason: classification (`~256`), cost caps, deliberately short outputs, or **`max_tokens: 0`** for cache pre-warming (see `shared/prompt-caching.md` → Pre-warming).\n- **128K output tokens:** Fable 5, Opus 4.6, Opus 4.7, Opus 4.8, Sonnet 5, and Sonnet 4.6 support up to 128K `max_tokens`, but the SDKs require streaming for values that large to avoid HTTP timeouts. Use `.stream()` with `.get_final_message()` / `.finalMessage()`.\n- **Tool call JSON parsing (Fable 5 and the 4.6/4.7/4.8 family):** Fable 5, Opus 4.6, Opus 4.7, Opus 4.8, and Sonnet 4.6 may produce different JSON string escaping in tool call `input` fields (e.g., Unicode or forward-slash escaping). Always parse tool inputs with `json.loads()` / `JSON.parse()` — never do raw string matching on the serialized input.\n- **Structured outputs (all models):** Use `output_config: {format: {...}}` instead of the deprecated `output_format` parameter on `messages.create()`. This is a general API change, not 4.6-specific.\n- **Don't reimplement SDK functionality:** The SDK provides high-level helpers — use them instead of building from scratch. Specifically: use `stream.finalMessage()` instead of wrapping `.on()` events in `new Promise()`; use typed exception classes (`Anthropic.RateLimitError`, etc.) instead of string-matching error messages; use SDK types (`Anthropic.MessageParam`, `Anthropic.Tool`, `Anthropic.Message`, etc.) instead of redefining equivalent interfaces.\n- **Error handling — catch a chain, not one broad class.** A single `except APIStatusError` / `catch (AnthropicServiceException)` / `rescue APIError` loses the distinction between retryable (429, ≥500, network) and non-retryable (400/404) failures. Write a most-specific-first chain — e.g. `NotFoundError` → `RateLimitError` → `APIStatusError` → `APIConnectionError` (or the Go equivalent: `errors.As` into `*anthropic.Error` then `switch apierr.StatusCode { case 404: …; case 429: …; default: … }`). Per-language class names and namespaces are in `shared/error-codes.md`.\n- **Don't research SDK types — write first.** If a type name isn't shown in the documentation included in this skill, write the code file from the namespace/package tables in the language-specific doc and let the compiler's error point you to the right name. Do not spend turns on WebFetch, SDK-repo clones, or compiling-and-running a separate reflection program to discover type names before writing — produce the source file first, then fix what the compiler reports. A quick `strings` / `jar tf` / `javap` against the installed SDK is acceptable for locating names (it returns in seconds), but don't escalate beyond that. A file with a wrong type name is recoverable; a session spent on discovery with no file written is not.\n- **Bash and text editor tools are Anthropic-defined, schema-less.** Declare `{\"type\": \"bash_20250124\", \"name\": \"bash\"}` / `{\"type\": \"text_editor_20250728\", \"name\": \"str_replace_based_edit_tool\"}` — no `input_schema`. A custom tool with your own schema named `\"bash\"` is a different tool. Handler paths and security checks are in `shared/tool-use-concepts.md` § Client-Side Tools.\n- **Advisor tool model pairing.** The advisor tool's `model` must be at least as capable as the request's top-level `model` — e.g. executor `claude-sonnet-5` → advisor `claude-opus-4-8` or `claude-opus-4-7`. An invalid pair returns 400. Pairing table in `shared/tool-use-concepts.md` § Advisor. Availability: `shared/platform-availability.md`.\n- **Agent Skills ≠ Managed Agents.** To have Claude generate a `.pptx`/`.xlsx`/etc. via Agent Skills, call `client.beta.messages.create` with `container={\"skills\": [...]}`, the `code_execution_20260521` tool, and both `code-execution-2025-08-25` + `skills-2025-10-02` betas. Do not use `client.beta.agents` / `sessions` / `environments` here — those are the Managed Agents surface, not Agent Skills.\n- **MCP connector needs both halves.** `mcp_servers=[{type:\"url\", url, name}]` alone is rejected as a validation error — also add `tools=[{type:\"mcp_toolset\", mcp_server_name:<same name>}]` with beta `mcp-client-2025-11-20`. Availability: `shared/platform-availability.md`.\n- **Context editing ≠ compaction.** Context editing *clears* tool results and thinking blocks; compaction *summarizes* history. For context editing, use `context_management.edits` with type `clear_tool_uses_20250919` (or `clear_thinking_20251015`) on `client.beta.messages.*` with beta `context-management-2025-06-27` — not the `compact_20260112` type or `compact-2026-01-12` beta, which are compaction.\n- **`inference_geo` is a direct top-level request parameter** — `client.messages.create(..., inference_geo=\"us\")` / `.inferenceGeo(\"us\")`. Do not put it in `extra_body` / `putAdditionalBodyProperty`. Supported on Opus 4.6 / Sonnet 4.6 and later; availability: `shared/platform-availability.md`. `response.usage.inference_geo` reports where inference ran.\n- **Fine-grained tool streaming is not a beta feature.** Set `eager_input_streaming: true` on the tool definition and call the regular `client.messages.stream(...)`. There is no beta header and no `client.beta.*` path.\n- **Cache diagnostics is beta.** Use `client.beta.messages.*` with beta `cache-diagnosis-2026-04-07`. Pass `diagnostics: {previous_message_id: null}` on the first turn and `diagnostics: {previous_message_id: <previous response id>}` on subsequent turns; the result is on `response.diagnostics`. Availability: `shared/platform-availability.md`.\n- **Memory tool type is `memory_20250818`.** Declare `{\"type\": \"memory_20250818\", \"name\": \"memory\"}`. Go uses the beta-namespace type `{OfMemoryTool20250818: &anthropic.BetaMemoryTool20250818Param{}}` on `client.Beta.Messages.New`; Python/TypeScript/Ruby/PHP/C# use the non-beta `client.messages.create`; Java has both a non-beta `MemoryTool20250818` and a beta tool-runner path. Python/TypeScript provide `BetaAbstractMemoryTool` / `betaMemoryTool` helpers for implementing the backend.\n- **Use a model the feature actually supports.** Some features are restricted to specific model tiers — fast mode is Opus 4.8 / 4.7 only, task budgets are Fable 5 / Sonnet 5 / Opus 4.8 / 4.7 only, and the advisor tool requires a valid executor↔advisor pair. If the user's prompt names a model that the feature doesn't support, use a supported model instead and note the substitution in the output.\n- **Bedrock / Foundry: use the platform client class.** For Bedrock use the `…BedrockMantle…` client (e.g. Python `AnthropicBedrockMantle`, Java `BedrockMantleBackend`) with `anthropic.`-prefixed model IDs; `AnthropicBedrock`/`BedrockBackend` without `Mantle` is the legacy path. For Foundry use `AnthropicFoundry` / `FoundryBackend` / `AnthropicFoundryClient` where the SDK supports it (C#, Java, PHP, Python, TypeScript); Go and Ruby have no Foundry client — Ruby's documented fallback is the first-party client with a custom `base_url`. Per-language table above.\n- **Don't define custom types for SDK data structures:** The SDK exports types for all API objects. Use `Anthropic.MessageParam` for messages, `Anthropic.Tool` for tool definitions, `Anthropic.ToolUseBlock` / `Anthropic.ToolResultBlockParam` for tool results, `Anthropic.Message` for responses. Defining your own `interface ChatMessage { role: string; content: unknown }` duplicates what the SDK already provides and loses type safety.\n- **Report and document output:** For tasks that produce reports, documents, or visualizations, the code execution sandbox has `python-docx`, `python-pptx`, `matplotlib`, `pillow`, and `pypdf` pre-installed. Claude can generate formatted files (DOCX, PDF, charts) and return them via the Files API — consider this for \"report\" or \"document\" type requests instead of plain stdout text.\n- **Server-tool errors don't raise.** Web search and web fetch errors return HTTP 200 with a `web_search_tool_result` / `web_fetch_tool_result` block whose `content` is a single error object (e.g. `{error_code: \"max_uses_exceeded\"}`) — not a raised exception. For web search, a success `content` is a *list*; an error `content` is an *object* — branch on that before indexing.\n- **Code execution output block type:** `code_execution_20260521` returns `bash_code_execution_tool_result` (with `.content.stdout`), **not** the legacy bare `code_execution_tool_result`. Iterate `response.content` and match on the correct type.\n- **Tool search: never defer everything.** The search tool itself must not have `defer_loading: true`, and at least one tool in `tools` must be non-deferred, or the API returns 400 `All tools have defer_loading set`.\n- **`strict: true` goes on the tool, not `tool_choice`.** Putting `strict` on `tool_choice` does nothing; it's a sibling of `name`/`description`/`input_schema` on the tool definition itself.\n- **Parallel tool results go in ONE user message.** Splitting `tool_result` blocks across multiple user messages silently trains Claude to stop making parallel calls. One assistant message of `tool_use` blocks → one user message of `tool_result` blocks.\n- **Citations + structured outputs are incompatible.** Enabling `citations: {enabled: true}` on a document while also setting `output_config.format` returns a 400.\n- **Batch results are unordered.** Match by `custom_id`, never by position in the results stream.\n- **Vertex model IDs have no prefix.** Unlike Bedrock's `anthropic.`-prefixed IDs, Vertex takes the bare first-party ID for current-generation models (e.g. `\"claude-opus-4-8\"`); dated-snapshot models use an `@` separator (e.g. `claude-haiku-4-5@20251001`).\n- **`stop_details` is `null` unless `stop_reason == \"refusal\"`.** For `max_tokens`, `end_turn`, etc., `stop_details` is `null` — guard before reading `.category`.\n- **WIF auth: unset `ANTHROPIC_API_KEY`, `ANTHROPIC_AUTH_TOKEN`, and `ANTHROPIC_PROFILE`.** `ANTHROPIC_API_KEY` and `ANTHROPIC_AUTH_TOKEN` (even set to `\"\"`) outrank Workload Identity Federation in the SDK's precedence chain and silently win; a set `ANTHROPIC_PROFILE` also wins (a missing named profile is an error, not a fall-through). `unset` them, don't blank them.\n\n## User Request\n\nZugangswege zu Claude: Abo/OAuth vs. API-Key vs. Vertex AI vs. Bedrock — Auth, Env-Vars, Abrechnung"}]},"isMeta":true,"uuid":"14c1d1d4-7464-4318-bce4-e3cadf0c84aa","timestamp":"2026-07-05T08:20:35.397Z","sourceToolUseID":"toolu_01D7hchwQw1SKceiro8K2Zvk","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"84f74533-e596-4bdf-93c5-c578b71c12fc","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_01BLMn2Uvbj77KGQR8WHUd7z","type":"message","role":"assistant","content":[{"type":"text","text":"Hier die Aufklärung, von Grund auf. Es geht um eine Frage: **Wie beweist eine Anfrage an ein Claude-Modell, dass sie bezahlt wird — und wer stellt die Rechnung?** Alle vier Wege beantworten nur diese Frage unterschiedlich. Das Modell dahinter ist dasselbe.\n\n## Das Grundbild\n\nClaude Code (die CLI) ist ein Client. Bei jedem Modell-Aufruf schickt er einen HTTP-Request an einen Endpunkt und muss dabei einen Berechtigungsnachweis (Credential) mitliefern. Es gibt zwei Anbieter-Kategorien:\n\n- **Anthropic direkt** (api.anthropic.com) — Wege 1 und 2\n- **Cloud-Provider, die Claude hosten** (Google Vertex AI, Amazon Bedrock) — Wege 3 und 4. Anthropic stellt Google/Amazon die Modelle bereit, die betreiben sie in ihren Rechenzentren und rechnen über das jeweilige Cloud-Konto ab.\n\n## Weg 1: Abo / OAuth (was du heute nutzt)\n\n- **Was es ist:** Ein Claude.ai-Abo (Pro oder Max), Festpreis pro Monat. Kein Bezahlen pro Token, dafür Nutzungslimits (Rate Limits pro 5-Stunden-Fenster bzw. Woche).\n- **Wie die Authentifizierung läuft:** `claude` öffnet beim Login den Browser, du meldest dich am Claude.ai-Konto an, zurück kommt ein **OAuth-Token** (Access-Token + Refresh-Token). Das ist kein statischer Schlüssel, sondern ein ablaufendes Ticket, das die CLI automatisch erneuert.\n- **Wo es liegt:** Auf dem Mac im **Keychain** (Eintrag „Claude Code-credentials\"). In deinem Pool-Setup: ein suffixierter Keychain-Eintrag pro Config-Dir — genau deshalb ist ein Pool-Mitglied hier ein *Config-Verzeichnis mit zugehörigem Keychain-Eintrag*, nicht bloß eine Umgebungsvariable.\n- **Endpunkt:** api.anthropic.com, aber mit `Authorization: Bearer <token>` statt API-Key-Header.\n- **Abrechnung:** Abo-Pauschale. Für die API (eigene Programme) ist dieses Token nicht gedacht — es ist an die Claude-Code-/Claude.ai-Nutzung gebunden.\n\n## Weg 2: API-Key\n\n- **Was es ist:** Ein statischer Schlüssel (`sk-ant-...`) aus der Anthropic Console (console.anthropic.com). Abrechnung **pro Token** (z. B. Opus 4.8: $5 Input / $25 Output je Million Tokens), Rechnung von Anthropic, Guthaben oder Kreditkarte.\n- **Wie die Authentifizierung läuft:** Der Key wird bei jedem Request als Header `x-api-key` mitgeschickt. Kein Login, kein Ablauf, kein Refresh — wer den Key hat, kann auf Kosten des Kontos Requests machen.\n- **Env-Var:** `ANTHROPIC_API_KEY`. SDKs und Claude Code lesen sie automatisch. Wichtig: eine gesetzte `ANTHROPIC_API_KEY` **gewinnt gegen das OAuth-Abo** — Claude Code nutzt dann den Key und rechnet pro Token ab, auch wenn ein Abo-Login existiert. Das ist die klassische Falle.\n- **Endpunkt:** api.anthropic.com.\n\n## Weg 3: Google Vertex AI\n\n- **Was es ist:** Claude-Modelle, gehostet in der Google Cloud. Du brauchst ein **GCP-Projekt**, in dem die Claude-Modelle freigeschaltet sind (Vertex AI „Model Garden\"). Abrechnung pro Token **über die GCP-Rechnung** — Anthropic sieht davon nichts, es gibt kein Anthropic-Konto.\n- **Wie die Authentifizierung läuft:** Kein Anthropic-Credential, sondern **Google-Auth**. Standardweg: `gcloud auth application-default login` erzeugt sogenannte Application Default Credentials (ADC) — eine Datei unter `~/.config/gcloud/application_default_credentials.json`. Daraus holt sich der Client kurzlebige Google-Access-Tokens. Alternativ ein Service-Account-JSON (`GOOGLE_APPLICATION_CREDENTIALS=<pfad>`).\n- **Env-Vars für Claude Code:**\n  - `CLAUDE_CODE_USE_VERTEX=1` — schaltet den Backend-Modus um\n  - `ANTHROPIC_VERTEX_PROJECT_ID=<gcp-projekt>` — welches Projekt zahlt\n  - `CLOUD_ML_REGION=<region>` — z. B. `global` (empfohlen) oder `europe-west1`\n- **Endpunkt:** `<region>-aiplatform.googleapis.com`, Modell-IDs ohne Präfix (`claude-opus-4-8`).\n- **Für dein Pool-Design entscheidend:** Der komplette Zustand steckt in Env-Vars plus der gcloud-ADC-Datei. Kein Keychain-Eintrag, kein Login-Flow in Claude Code selbst. Ein Vertex-Pool-Mitglied ist also nur ein Satz Umgebungsvariablen — daher „env-Pool\" als dritter credentialType. Mehrere Pool-Mitglieder können sogar dasselbe GCP-Projekt teilen oder pro Mitglied ein anderes Projekt/Region setzen.\n\n## Weg 4: Amazon Bedrock\n\nSpiegelbild von Vertex, nur mit AWS:\n\n- **Abrechnung** pro Token über das AWS-Konto.\n- **Auth:** AWS-Credentials (Access Key/Secret in Env-Vars, `~/.aws/credentials`, oder SSO/`aws sso login`). Requests werden SigV4-signiert — auch hier kein Anthropic-Credential.\n- **Env-Vars für Claude Code:** `CLAUDE_CODE_USE_BEDROCK=1`, `AWS_REGION=<region>`, plus die üblichen AWS-Credential-Vars.\n- **Modell-IDs** mit Präfix: `anthropic.claude-opus-4-8`.\n\n## Gegenüberstellung\n\n| | Abo/OAuth | API-Key | Vertex | Bedrock |\n|---|---|---|---|---|\n| Rechnungssteller | Anthropic (Pauschale) | Anthropic (pro Token) | Google Cloud (pro Token) | AWS (pro Token) |\n| Credential | OAuth-Token, ablaufend | statischer Key | Google ADC / Service Account | AWS-Keys / SSO |\n| Ablage lokal | **Keychain** (pro Config-Dir) | Env-Var | gcloud-Datei + Env-Vars | ~/.aws + Env-Vars |\n| Umschalter in Claude Code | Login-Flow | `ANTHROPIC_API_KEY` | `CLAUDE_CODE_USE_VERTEX=1` | `CLAUDE_CODE_USE_BEDROCK=1` |\n| Limits | 5h-/Wochen-Fenster des Abos | Tier-Rate-Limits | GCP-Quotas pro Projekt/Region | AWS-Quotas |\n\n## Was das für die Vertex-Integration in ai-control heißt\n\nDer strukturelle Unterschied zu deinen zwei bestehenden credentialTypes: OAuth braucht **Zustand** (Keychain-Eintrag, Refresh-Zyklus, Login-Flow), Vertex braucht **nur Konfiguration**. Ein Vertex-Pool-Mitglied ist vollständig durch drei Env-Vars beschrieben; das eigentliche Google-Credential (ADC) liegt maschinenweit bei gcloud und wird von allen Mitgliedern geteilt. Deshalb ist „env-Pool\" die passende Modellierung: ai-control muss nichts erneuern und nichts im Keychain verwalten, sondern beim Start der Session nur die Variablen ins Environment injizieren. Einzige laufende Abhängigkeit: die gcloud-ADC muss gültig sein (`gcloud auth application-default login` gelegentlich erneuern, bei Service-Account-JSON entfällt auch das).\n\nZwei Einschränkungen von Vertex gegenüber api.anthropic.com, die man wissen sollte: einzelne API-Features fehlen dort (u. a. Web-Fetch, Code Execution, Batches, Managed Agents; Web-Search nur in der Basis-Variante), und Kosten/Quotas hängen am GCP-Projekt statt an einem Anthropic-Konto. 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{"parentUuid":"aaf4ebdc-356c-47c0-8a4c-66892ed3537d","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01216M5LhdSYGMerpH395kFN","type":"tool_result","content":"/home/marcuh/projects/ai-control/src/i18n.ts:43:    dockIcon: \"Dock-Icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:46:    defaultIcon: \"Standard-Icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:152:    dockIcon: \"Dock icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:155:    defaultIcon: \"Default icon\",\n/home/marcuh/projects/ai-control/src/style.css:567:.icon-row {\n/home/marcuh/projects/ai-control/src/style.css:573:.icon-path {\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:11:  terminal: { theme: string | null; icon: string | null; title: string | null };\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:119:  icon: string | null;\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:132:      icon: p.terminal.icon,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:141:async function pickIcon() {\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:145:    filters: [{ name: \"Icon\", extensions: [\"png\", \"icns\"] }],\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:147:  if (typeof file === \"string\") settings.value!.icon = file;\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:157:      icon: s.icon,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:219:        icon: null,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:367:        <span class=\"icon-row\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:386:        <span class=\"icon-path\">{{ wizard.workDir }}</span>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:469:        {{ $t(\"projects.dockIcon\") }}\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:470:        <span class=\"icon-row\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:471:          <button @click=\"pickIcon\">{{ $t(\"projects.chooseFile\") }}</button>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:472:          <button v-if=\"settings.icon\" @click=\"settings.icon = null\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:475:          <span v-if=\"settings.icon\" class=\"icon-path hover-pop\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:476:            {{ settings.icon.split(\"/\").pop() }}\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:477:            <span class=\"pop pop-path\">{{ settings.icon }}</span>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:479:          <span v-else class=\"icon-path\">{{ $t(\"projects.defaultIcon\") }}</span>\n/home/marcuh/projects/ai-control/src/terminal.ts:395:  terminal: { theme: string | null; icon: string | null; title: string | null };\n---\n517","is_error":false}]},"uuid":"b7be4555-89e5-443c-8c6b-08a48fc00aeb","timestamp":"2026-07-05T08:50:12.544Z","toolUseResult":{"stdout":"/home/marcuh/projects/ai-control/src/i18n.ts:43:    dockIcon: \"Dock-Icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:46:    defaultIcon: \"Standard-Icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:152:    dockIcon: \"Dock icon\",\n/home/marcuh/projects/ai-control/src/i18n.ts:155:    defaultIcon: \"Default icon\",\n/home/marcuh/projects/ai-control/src/style.css:567:.icon-row {\n/home/marcuh/projects/ai-control/src/style.css:573:.icon-path {\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:11:  terminal: { theme: string | null; icon: string | null; title: string | null };\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:119:  icon: string | null;\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:132:      icon: p.terminal.icon,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:141:async function pickIcon() {\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:145:    filters: [{ name: \"Icon\", extensions: [\"png\", \"icns\"] }],\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:147:  if (typeof file === \"string\") settings.value!.icon = file;\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:157:      icon: s.icon,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:219:        icon: null,\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:367:        <span class=\"icon-row\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:386:        <span class=\"icon-path\">{{ wizard.workDir }}</span>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:469:        {{ $t(\"projects.dockIcon\") }}\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:470:        <span class=\"icon-row\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:471:          <button @click=\"pickIcon\">{{ $t(\"projects.chooseFile\") }}</button>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:472:          <button v-if=\"settings.icon\" @click=\"settings.icon = null\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:475:          <span v-if=\"settings.icon\" class=\"icon-path hover-pop\">\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:476:            {{ settings.icon.split(\"/\").pop() }}\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:477:            <span class=\"pop pop-path\">{{ settings.icon }}</span>\n/home/marcuh/projects/ai-control/src/components/ProjectList.vue:479:          <span v-else class=\"icon-path\">{{ $t(\"projects.defaultIcon\") }}</span>\n/home/marcuh/projects/ai-control/src/terminal.ts:395:  terminal: { theme: string | null; 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{"parentUuid":"b7be4555-89e5-443c-8c6b-08a48fc00aeb","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_0158BwqnAdqZawmheJc5JJgg","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01JMjCGBBWys7qvCS6UA8eU8","name":"Read","input":{"file_path":"/home/marcuh/projects/ai-control/src/components/ProjectList.vue"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":1503,"cache_read_input_tokens":341328,"output_tokens":79,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1503,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":79,"cache_read_input_tokens":341328,"cache_creation_input_tokens":1503,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1503},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011Ccid8c2R37VwXL251XQvU","type":"assistant","uuid":"80c4c380-1321-4e2f-b558-1132c08f9166","timestamp":"2026-07-05T08:50:18.245Z","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
{"parentUuid":"80c4c380-1321-4e2f-b558-1132c08f9166","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01JMjCGBBWys7qvCS6UA8eU8","type":"tool_result","content":"1\t<script setup lang=\"ts\">\n2\timport { onMounted, onUnmounted, ref } from \"vue\";\n3\timport { invoke } from \"@tauri-apps/api/core\";\n4\timport { open } from \"@tauri-apps/plugin-dialog\";\n5\t\n6\tinterface Project {\n7\t  name: string;\n8\t  path: string;\n9\t  pool: string | null;\n10\t  running: boolean;\n11\t  terminal: { theme: string | null; icon: string | null; title: string | null };\n12\t}\n13\t\n14\tinterface Pool {\n15\t  name: string;\n16\t  credentialType: string;\n17\t  hasCredentials: boolean;\n18\t}\n19\t\n20\tfunction poolReady(p: Project): boolean {\n21\t  if (!p.pool) return false;\n22\t  const pool = pools.value.find((x) => x.name === p.pool);\n23\t  return pool !== undefined && pool.hasCredentials;\n24\t}\n25\t\n26\tfunction startBlockedReason(p: Project): string | undefined {\n27\t  if (poolReady(p)) return undefined;\n28\t  return p.pool ? \"projects.needsKey\" : \"projects.needsPool\";\n29\t}\n30\t\n31\tconst projects = ref<Project[]>([]);\n32\tconst pools = ref<Pool[]>([]);\n33\tconst error = ref(\"\");\n34\t\n35\tasync function refresh() {\n36\t  try {\n37\t    projects.value = await invoke<Project[]>(\"list_projects\");\n38\t    pools.value = await invoke<Pool[]>(\"list_pools\");\n39\t    error.value = \"\";\n40\t  } catch (e) {\n41\t    error.value = String(e);\n42\t  }\n43\t}\n44\t\n45\tasync function stop(project: Project) {\n46\t  try {\n47\t    await invoke(\"stop_project\", { project: project.name });\n48\t    await refresh();\n49\t  } catch (e) {\n50\t    error.value = String(e);\n51\t  }\n52\t}\n53\t\n54\tasync function openTerminal(project: Project) {\n55\t  try {\n56\t    await invoke(\"open_terminal\", { project: project.name });\n57\t    await refresh();\n58\t  } catch (e) {\n59\t    error.value = String(e);\n60\t  }\n61\t}\n62\t\n63\tinterface PendingRestart {\n64\t  name: string;\n65\t  from: string | null;\n66\t  to: string;\n67\t}\n68\t\n69\tconst pending = ref<PendingRestart | null>(null);\n70\tconst restarting = ref(false);\n71\t\n72\tasync function assign(project: Project, event: Event) {\n73\t  const pool = (event.target as HTMLSelectElement).value;\n74\t  const from = project.pool;\n75\t  try {\n76\t    await invoke(\"assign_pool\", { project: project.name, pool });\n77\t    if (project.running && pool !== from) {\n78\t      pending.value = { name: project.name, from, to: pool };\n79\t    }\n80\t    await refresh();\n81\t  } catch (e) {\n82\t    error.value = String(e);\n83\t  }\n84\t}\n85\t\n86\tasync function restartNow() {\n87\t  const p = pending.value!;\n88\t  restarting.value = true;\n89\t  try {\n90\t    await invoke(\"restart_project\", { project: p.name });\n91\t    pending.value = null;\n92\t    await refresh();\n93\t  } catch (e) {\n94\t    error.value = String(e);\n95\t    pending.value = null;\n96\t  }\n97\t  restarting.value = false;\n98\t}\n99\t\n100\tconst THEME_NAMES: [string, string][] = [\n101\t  [\"mocha\", \"Catppuccin Mocha\"],\n102\t  [\"dracula\", \"Dracula\"],\n103\t  [\"solarized-dark\", \"Solarized Dark\"],\n104\t  [\"gruvbox\", \"Gruvbox\"],\n105\t  [\"one-dark\", \"One Dark\"],\n106\t  [\"nord\", \"Nord\"],\n107\t  [\"tokyo-night\", \"Tokyo Night\"],\n108\t  [\"monokai\", \"Monokai\"],\n109\t  [\"rose-pine\", \"Rosé Pine\"],\n110\t  [\"everforest\", \"Everforest\"],\n111\t  [\"solarized-light\", \"Solarized Light\"],\n112\t  [\"catppuccin-latte\", \"Catppuccin Latte\"],\n113\t  [\"one-light\", \"One Light\"],\n114\t];\n115\t\n116\tinterface TerminalSettings {\n117\t  name: string;\n118\t  theme: string;\n119\t  icon: string | null;\n120\t  title: string;\n121\t  todo: boolean;\n122\t}\n123\t\n124\tconst settings = ref<TerminalSettings | null>(null);\n125\t\n126\tasync function openSettings(p: Project) {\n127\t  try {\n128\t    const todo = await invoke<boolean>(\"todo_state\", { project: p.name });\n129\t    settings.value = {\n130\t      name: p.name,\n131\t      theme: p.terminal.theme ?? \"mocha\",\n132\t      icon: p.terminal.icon,\n133\t      title: p.terminal.title ?? \"\",\n134\t      todo,\n135\t    };\n136\t  } catch (e) {\n137\t    error.value = String(e);\n138\t  }\n139\t}\n140\t\n141\tasync function pickIcon() {\n142\t  const file = await open({\n143\t    multiple: false,\n144\t    directory: false,\n145\t    filters: [{ name: \"Icon\", extensions: [\"png\", \"icns\"] }],\n146\t  });\n147\t  if (typeof file === \"string\") settings.value!.icon = file;\n148\t}\n149\t\n150\tasync function saveSettings() {\n151\t  const s = settings.value!;\n152\t  try {\n153\t    const title = s.title.trim();\n154\t    await invoke(\"set_terminal_config\", {\n155\t      project: s.name,\n156\t      theme: s.theme === \"mocha\" ? null : s.theme,\n157\t      icon: s.icon,\n158\t      title: title === \"\" ? null : title,\n159\t    });\n160\t    await invoke(\"set_todo\", { project: s.name, enabled: s.todo });\n161\t    settings.value = null;\n162\t    await refresh();\n163\t  } catch (e) {\n164\t    error.value = String(e);\n165\t  }\n166\t}\n167\t\n168\tinterface Wizard {\n169\t  name: string;\n170\t  pool: string;\n171\t  workDirMode: \"none\" | \"default\" | \"custom\";\n172\t  workDir: string | null;\n173\t  title: string;\n174\t  theme: string;\n175\t  todo: boolean;\n176\t}\n177\t\n178\tconst wizard = ref<Wizard | null>(null);\n179\t\n180\tfunction openWizard() {\n181\t  error.value = \"\";\n182\t  wizard.value = {\n183\t    name: \"\",\n184\t    pool: \"\",\n185\t    workDirMode: \"none\",\n186\t    workDir: null,\n187\t    title: \"\",\n188\t    theme: \"mocha\",\n189\t    todo: false,\n190\t  };\n191\t}\n192\t\n193\tasync function pickWorkDir() {\n194\t  const dir = await open({ directory: true, multiple: false });\n195\t  if (typeof dir === \"string\") {\n196\t    wizard.value!.workDir = dir;\n197\t    wizard.value!.workDirMode = \"custom\";\n198\t  }\n199\t}\n200\t\n201\tasync function createProject() {\n202\t  const w = wizard.value!;\n203\t  const name = w.name.trim();\n204\t  const workDir =\n205\t    w.workDirMode === \"default\"\n206\t      ? `~/projects/${name}`\n207\t      : w.workDirMode === \"custom\"\n208\t        ? w.workDir\n209\t        : null;\n210\t  const title = w.title.trim();\n211\t  try {\n212\t    await invoke(\"create_project_full\", {\n213\t      name,\n214\t      pool: w.pool === \"\" ? null : w.pool,\n215\t      workDir,\n216\t      createWorkDir: w.workDirMode === \"default\",\n217\t      terminal: {\n218\t        theme: w.theme === \"mocha\" ? null : w.theme,\n219\t        icon: null,\n220\t        title: title === \"\" ? null : title,\n221\t      },\n222\t      todo: w.todo,\n223\t    });\n224\t    wizard.value = null;\n225\t    await refresh();\n226\t  } catch (e) {\n227\t    error.value = String(e);\n228\t  }\n229\t}\n230\t\n231\tinterface PendingDelete {\n232\t  name: string;\n233\t  workDirs: string[];\n234\t  deleteWorkDirs: boolean;\n235\t}\n236\t\n237\tconst pendingDelete = ref<PendingDelete | null>(null);\n238\t\n239\tasync function askDelete(p: Project) {\n240\t  error.value = \"\";\n241\t  try {\n242\t    const workDirs = await invoke<string[]>(\"project_work_dirs\", {\n243\t      project: p.name,\n244\t    });\n245\t    pendingDelete.value = { name: p.name, workDirs, deleteWorkDirs: false };\n246\t  } catch (e) {\n247\t    error.value = String(e);\n248\t  }\n249\t}\n250\t\n251\tasync function confirmDelete() {\n252\t  const d = pendingDelete.value!;\n253\t  try {\n254\t    await invoke(\"delete_project\", {\n255\t      name: d.name,\n256\t      deleteWorkDirs: d.deleteWorkDirs,\n257\t    });\n258\t    pendingDelete.value = null;\n259\t    await refresh();\n260\t  } catch (e) {\n261\t    error.value = String(e);\n262\t    pendingDelete.value = null;\n263\t  }\n264\t}\n265\t\n266\tlet timer: number;\n267\tonMounted(() => {\n268\t  refresh();\n269\t  timer = window.setInterval(refresh, 3000);\n270\t});\n271\tonUnmounted(() => window.clearInterval(timer));\n272\t</script>\n273\t\n274\t<template>\n275\t  <div class=\"toolbar\">\n276\t    <button class=\"primary\" @click=\"openWizard\">\n277\t      {{ $t(\"projects.newProject\") }}\n278\t    </button>\n279\t  </div>\n280\t\n281\t  <p v-if=\"error\" class=\"error\">{{ error }}</p>\n282\t  <table class=\"grid\">\n283\t    <colgroup>\n284\t      <col class=\"col-dot\" />\n285\t      <col />\n286\t      <col class=\"col-pool\" />\n287\t      <col class=\"col-actions\" />\n288\t    </colgroup>\n289\t    <thead>\n290\t      <tr>\n291\t        <th></th>\n292\t        <th>{{ $t(\"projects.project\") }}</th>\n293\t        <th>{{ $t(\"projects.pool\") }}</th>\n294\t        <th></th>\n295\t      </tr>\n296\t    </thead>\n297\t    <tbody>\n298\t      <tr v-for=\"p in projects\" :key=\"p.name\">\n299\t        <td class=\"cell-dot\">\n300\t          <span class=\"dot\" :class=\"{ on: p.running }\"></span>\n301\t        </td>\n302\t        <td class=\"cell-name\">\n303\t          <strong>{{ p.name }}</strong>\n304\t          <small>{{ p.path }}</small>\n305\t        </td>\n306\t        <td>\n307\t          <select :value=\"p.pool ?? ''\" @change=\"assign(p, $event)\">\n308\t            <option value=\"\" disabled>{{ $t(\"projects.noPool\") }}</option>\n309\t            <option v-for=\"pool in pools\" :key=\"pool.name\" :value=\"pool.name\">\n310\t              {{ pool.name }}\n311\t            </option>\n312\t          </select>\n313\t        </td>\n314\t        <td class=\"cell-actions\">\n315\t          <span class=\"row-actions\">\n316\t            <button\n317\t              class=\"gear\"\n318\t              :title=\"$t('projects.terminalSettings')\"\n319\t              @click=\"openSettings(p)\"\n320\t            >\n321\t              ⚙︎\n322\t            </button>\n323\t            <button\n324\t              class=\"gear danger\"\n325\t              :disabled=\"p.running\"\n326\t              :title=\"p.running ? $t('projects.deleteRunning') : $t('projects.delete')\"\n327\t              @click=\"askDelete(p)\"\n328\t            >\n329\t              🗑\n330\t            </button>\n331\t            <button v-if=\"p.running\" class=\"stop\" @click=\"stop(p)\">\n332\t              {{ $t(\"projects.stop\") }}\n333\t            </button>\n334\t            <button\n335\t              v-else\n336\t              class=\"start\"\n337\t              :disabled=\"!poolReady(p)\"\n338\t              :title=\"startBlockedReason(p) && $t(startBlockedReason(p)!)\"\n339\t              @click=\"openTerminal(p)\"\n340\t            >\n341\t              {{ $t(\"projects.start\") }}\n342\t            </button>\n343\t          </span>\n344\t        </td>\n345\t      </tr>\n346\t    </tbody>\n347\t  </table>\n348\t\n349\t  <div v-if=\"wizard\" class=\"overlay\" @click.self=\"wizard = null\">\n350\t    <form class=\"dialog\" @submit.prevent=\"createProject\">\n351\t      <h3>{{ $t(\"projects.wizardTitle\") }}</h3>\n352\t      <label class=\"field\">\n353\t        {{ $t(\"projects.name\") }}\n354\t        <input v-model=\"wizard.name\" autofocus required />\n355\t      </label>\n356\t      <label class=\"field\">\n357\t        {{ $t(\"projects.pool\") }}\n358\t        <select v-model=\"wizard.pool\">\n359\t          <option value=\"\">{{ $t(\"projects.noPool\") }}</option>\n360\t          <option v-for=\"pool in pools\" :key=\"pool.name\" :value=\"pool.name\">\n361\t            {{ pool.name }}\n362\t          </option>\n363\t        </select>\n364\t      </label>\n365\t      <label class=\"field\">\n366\t        {{ $t(\"projects.workDir\") }}\n367\t        <span class=\"icon-row\">\n368\t          <select v-model=\"wizard.workDirMode\">\n369\t            <option value=\"none\">{{ $t(\"projects.workDirNone\") }}</option>\n370\t            <option value=\"default\">\n371\t              ~/projects/{{ wizard.name.trim() || \"…\" }}\n372\t            </option>\n373\t            <option value=\"custom\">{{ $t(\"projects.workDirCustom\") }}</option>\n374\t          </select>\n375\t          <button\n376\t            v-if=\"wizard.workDirMode === 'custom'\"\n377\t            type=\"button\"\n378\t            @click=\"pickWorkDir\"\n379\t          >\n380\t            {{ $t(\"projects.chooseFolder\") }}\n381\t          </button>\n382\t        </span>\n383\t      </label>\n384\t      <label v-if=\"wizard.workDirMode === 'custom' && wizard.workDir\" class=\"field\">\n385\t        <span></span>\n386\t        <span class=\"icon-path\">{{ wizard.workDir }}</span>\n387\t      </label>\n388\t      <label class=\"field\">\n389\t        {{ $t(\"projects.title\") }}\n390\t        <input v-model=\"wizard.title\" :placeholder=\"wizard.name.trim()\" />\n391\t      </label>\n392\t      <label class=\"field\">\n393\t        {{ $t(\"projects.theme\") }}\n394\t        <select v-model=\"wizard.theme\">\n395\t          <option v-for=\"[value, label] in THEME_NAMES\" :key=\"value\" :value=\"value\">\n396\t            {{ label }}\n397\t          </option>\n398\t        </select>\n399\t      </label>\n400\t      <label class=\"field\">\n401\t        {{ $t(\"projects.todo\") }}\n402\t        <span class=\"checkline\">\n403\t          <input v-model=\"wizard.todo\" type=\"checkbox\" />\n404\t          {{ $t(\"projects.todoDesc\") }}\n405\t        </span>\n406\t      </label>\n407\t      <p class=\"hint\">{{ $t(\"projects.wizardHint\") }}</p>\n408\t      <div class=\"actions\">\n409\t        <button type=\"button\" @click=\"wizard = null\">\n410\t          {{ $t(\"projects.cancel\") }}\n411\t        </button>\n412\t        <button\n413\t          type=\"submit\"\n414\t          class=\"primary\"\n415\t          :disabled=\"\n416\t            wizard.name.trim() === '' ||\n417\t            (wizard.workDirMode === 'custom' && !wizard.workDir)\n418\t          \"\n419\t        >\n420\t          {{ $t(\"projects.create\") }}\n421\t        </button>\n422\t      </div>\n423\t    </form>\n424\t  </div>\n425\t\n426\t  <div v-if=\"pendingDelete\" class=\"overlay\" @click.self=\"pendingDelete = null\">\n427\t    <div class=\"dialog\">\n428\t      <h3>{{ $t(\"projects.deleteTitle\", { name: pendingDelete.name }) }}</h3>\n429\t      <p class=\"hint\">{{ $t(\"projects.deleteWarning\", { name: pendingDelete.name }) }}</p>\n430\t      <template v-if=\"pendingDelete.workDirs.length\">\n431\t        <label class=\"checkline\">\n432\t          <input v-model=\"pendingDelete.deleteWorkDirs\" type=\"checkbox\" />\n433\t          {{ $t(\"projects.deleteWorkDirs\") }}\n434\t        </label>\n435\t        <ul class=\"affected\">\n436\t          <li v-for=\"wd in pendingDelete.workDirs\" :key=\"wd\">{{ wd }}</li>\n437\t        </ul>\n438\t        <p v-if=\"!pendingDelete.deleteWorkDirs\" class=\"hint\">\n439\t          {{ $t(\"projects.workDirsStay\") }}\n440\t        </p>\n441\t      </template>\n442\t      <div class=\"actions\">\n443\t        <button type=\"button\" @click=\"pendingDelete = null\">\n444\t          {{ $t(\"projects.cancel\") }}\n445\t        </button>\n446\t        <button class=\"danger\" @click=\"confirmDelete\">\n447\t          {{ $t(\"projects.delete\") }}\n448\t        </button>\n449\t      </div>\n450\t    </div>\n451\t  </div>\n452\t\n453\t  <div v-if=\"settings\" class=\"overlay\">\n454\t    <div class=\"dialog\">\n455\t      <h3>{{ $t(\"projects.terminal\", { name: settings.name }) }}</h3>\n456\t      <label class=\"field\">\n457\t        {{ $t(\"projects.title\") }}\n458\t        <input v-model=\"settings.title\" :placeholder=\"settings.name\" />\n459\t      </label>\n460\t      <label class=\"field\">\n461\t        {{ $t(\"projects.theme\") }}\n462\t        <select v-model=\"settings.theme\">\n463\t          <option v-for=\"[value, label] in THEME_NAMES\" :key=\"value\" :value=\"value\">\n464\t            {{ label }}\n465\t          </option>\n466\t        </select>\n467\t      </label>\n468\t      <label class=\"field\">\n469\t        {{ $t(\"projects.dockIcon\") }}\n470\t        <span class=\"icon-row\">\n471\t          <button @click=\"pickIcon\">{{ $t(\"projects.chooseFile\") }}</button>\n472\t          <button v-if=\"settings.icon\" @click=\"settings.icon = null\">\n473\t            {{ $t(\"projects.remove\") }}\n474\t          </button>\n475\t          <span v-if=\"settings.icon\" class=\"icon-path hover-pop\">\n476\t            {{ settings.icon.split(\"/\").pop() }}\n477\t            <span class=\"pop pop-path\">{{ settings.icon }}</span>\n478\t          </span>\n479\t          <span v-else class=\"icon-path\">{{ $t(\"projects.defaultIcon\") }}</span>\n480\t        </span>\n481\t      </label>\n482\t      <label class=\"field\">\n483\t        {{ $t(\"projects.todo\") }}\n484\t        <span class=\"checkline\">\n485\t          <input v-model=\"settings.todo\" type=\"checkbox\" />\n486\t          {{ $t(\"projects.todoDesc\") }}\n487\t        </span>\n488\t      </label>\n489\t      <p class=\"hint\">{{ $t(\"projects.appliesNextStart\") }}</p>\n490\t      <div class=\"actions\">\n491\t        <button @click=\"settings = null\">{{ $t(\"projects.cancel\") }}</button>\n492\t        <button class=\"primary\" @click=\"saveSettings\">\n493\t          {{ $t(\"projects.save\") }}\n494\t        </button>\n495\t      </div>\n496\t    </div>\n497\t  </div>\n498\t\n499\t  <div v-if=\"pending\" class=\"overlay\">\n500\t    <div class=\"dialog\">\n501\t      <h3>{{ $t(\"projects.stillRunning\", { name: pending.name }) }}</h3>\n502\t      <p>{{ $t(\"projects.poolChangeSaved\") }}</p>\n503\t      <div class=\"pools\">\n504\t        <span class=\"chip\">{{ pending.from ?? $t(\"projects.noPoolAssigned\") }}</span>\n505\t        <span class=\"arrow\">→</span>\n506\t        <span class=\"chip new\">{{ pending.to }}</span>\n507\t      </div>\n508\t      <p class=\"hint\">{{ $t(\"projects.restartHint\") }}</p>\n509\t      <div class=\"actions\">\n510\t        <button @click=\"pending = null\">{{ $t(\"projects.keepRunning\") }}</button>\n511\t        <button class=\"primary\" :disabled=\"restarting\" @click=\"restartNow\">\n512\t          {{ restarting ? $t(\"projects.restarting\") : $t(\"projects.restartNow\") }}\n513\t        </button>\n514\t      </div>\n515\t    </div>\n516\t  </div>\n517\t</template>\n518\t"}]},"uuid":"0e5efa72-3c86-4627-ad22-eaf32e4b3144","timestamp":"2026-07-05T08:50:18.259Z","toolUseResult":{"type":"text","file":{"filePath":"/home/marcuh/projects/ai-control/src/components/ProjectList.vue","content":"<script setup lang=\"ts\">\nimport { onMounted, onUnmounted, ref } from \"vue\";\nimport { invoke } from \"@tauri-apps/api/core\";\nimport { open } from \"@tauri-apps/plugin-dialog\";\n\ninterface Project {\n  name: string;\n  path: string;\n  pool: string | null;\n  running: boolean;\n  terminal: { theme: string | null; icon: string | null; title: string | null };\n}\n\ninterface Pool {\n  name: string;\n  credentialType: string;\n  hasCredentials: boolean;\n}\n\nfunction poolReady(p: Project): boolean {\n  if (!p.pool) return false;\n  const pool = pools.value.find((x) => x.name === p.pool);\n  return pool !== undefined && pool.hasCredentials;\n}\n\nfunction startBlockedReason(p: Project): string | undefined {\n  if (poolReady(p)) return undefined;\n  return p.pool ? \"projects.needsKey\" : \"projects.needsPool\";\n}\n\nconst projects = ref<Project[]>([]);\nconst pools = ref<Pool[]>([]);\nconst error = ref(\"\");\n\nasync function refresh() {\n  try {\n    projects.value = await invoke<Project[]>(\"list_projects\");\n    pools.value = await invoke<Pool[]>(\"list_pools\");\n    error.value = \"\";\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\nasync function stop(project: Project) {\n  try {\n    await invoke(\"stop_project\", { project: project.name });\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\nasync function openTerminal(project: Project) {\n  try {\n    await invoke(\"open_terminal\", { project: project.name });\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\ninterface PendingRestart {\n  name: string;\n  from: string | null;\n  to: string;\n}\n\nconst pending = ref<PendingRestart | null>(null);\nconst restarting = ref(false);\n\nasync function assign(project: Project, event: Event) {\n  const pool = (event.target as HTMLSelectElement).value;\n  const from = project.pool;\n  try {\n    await invoke(\"assign_pool\", { project: project.name, pool });\n    if (project.running && pool !== from) {\n      pending.value = { name: project.name, from, to: pool };\n    }\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\nasync function restartNow() {\n  const p = pending.value!;\n  restarting.value = true;\n  try {\n    await invoke(\"restart_project\", { project: p.name });\n    pending.value = null;\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n    pending.value = null;\n  }\n  restarting.value = false;\n}\n\nconst THEME_NAMES: [string, string][] = [\n  [\"mocha\", \"Catppuccin Mocha\"],\n  [\"dracula\", \"Dracula\"],\n  [\"solarized-dark\", \"Solarized Dark\"],\n  [\"gruvbox\", \"Gruvbox\"],\n  [\"one-dark\", \"One Dark\"],\n  [\"nord\", \"Nord\"],\n  [\"tokyo-night\", \"Tokyo Night\"],\n  [\"monokai\", \"Monokai\"],\n  [\"rose-pine\", \"Rosé Pine\"],\n  [\"everforest\", \"Everforest\"],\n  [\"solarized-light\", \"Solarized Light\"],\n  [\"catppuccin-latte\", \"Catppuccin Latte\"],\n  [\"one-light\", \"One Light\"],\n];\n\ninterface TerminalSettings {\n  name: string;\n  theme: string;\n  icon: string | null;\n  title: string;\n  todo: boolean;\n}\n\nconst settings = ref<TerminalSettings | null>(null);\n\nasync function openSettings(p: Project) {\n  try {\n    const todo = await invoke<boolean>(\"todo_state\", { project: p.name });\n    settings.value = {\n      name: p.name,\n      theme: p.terminal.theme ?? \"mocha\",\n      icon: p.terminal.icon,\n      title: p.terminal.title ?? \"\",\n      todo,\n    };\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\nasync function pickIcon() {\n  const file = await open({\n    multiple: false,\n    directory: false,\n    filters: [{ name: \"Icon\", extensions: [\"png\", \"icns\"] }],\n  });\n  if (typeof file === \"string\") settings.value!.icon = file;\n}\n\nasync function saveSettings() {\n  const s = settings.value!;\n  try {\n    const title = s.title.trim();\n    await invoke(\"set_terminal_config\", {\n      project: s.name,\n      theme: s.theme === \"mocha\" ? null : s.theme,\n      icon: s.icon,\n      title: title === \"\" ? null : title,\n    });\n    await invoke(\"set_todo\", { project: s.name, enabled: s.todo });\n    settings.value = null;\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\ninterface Wizard {\n  name: string;\n  pool: string;\n  workDirMode: \"none\" | \"default\" | \"custom\";\n  workDir: string | null;\n  title: string;\n  theme: string;\n  todo: boolean;\n}\n\nconst wizard = ref<Wizard | null>(null);\n\nfunction openWizard() {\n  error.value = \"\";\n  wizard.value = {\n    name: \"\",\n    pool: \"\",\n    workDirMode: \"none\",\n    workDir: null,\n    title: \"\",\n    theme: \"mocha\",\n    todo: false,\n  };\n}\n\nasync function pickWorkDir() {\n  const dir = await open({ directory: true, multiple: false });\n  if (typeof dir === \"string\") {\n    wizard.value!.workDir = dir;\n    wizard.value!.workDirMode = \"custom\";\n  }\n}\n\nasync function createProject() {\n  const w = wizard.value!;\n  const name = w.name.trim();\n  const workDir =\n    w.workDirMode === \"default\"\n      ? `~/projects/${name}`\n      : w.workDirMode === \"custom\"\n        ? w.workDir\n        : null;\n  const title = w.title.trim();\n  try {\n    await invoke(\"create_project_full\", {\n      name,\n      pool: w.pool === \"\" ? null : w.pool,\n      workDir,\n      createWorkDir: w.workDirMode === \"default\",\n      terminal: {\n        theme: w.theme === \"mocha\" ? null : w.theme,\n        icon: null,\n        title: title === \"\" ? null : title,\n      },\n      todo: w.todo,\n    });\n    wizard.value = null;\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\ninterface PendingDelete {\n  name: string;\n  workDirs: string[];\n  deleteWorkDirs: boolean;\n}\n\nconst pendingDelete = ref<PendingDelete | null>(null);\n\nasync function askDelete(p: Project) {\n  error.value = \"\";\n  try {\n    const workDirs = await invoke<string[]>(\"project_work_dirs\", {\n      project: p.name,\n    });\n    pendingDelete.value = { name: p.name, workDirs, deleteWorkDirs: false };\n  } catch (e) {\n    error.value = String(e);\n  }\n}\n\nasync function confirmDelete() {\n  const d = pendingDelete.value!;\n  try {\n    await invoke(\"delete_project\", {\n      name: d.name,\n      deleteWorkDirs: d.deleteWorkDirs,\n    });\n    pendingDelete.value = null;\n    await refresh();\n  } catch (e) {\n    error.value = String(e);\n    pendingDelete.value = null;\n  }\n}\n\nlet timer: number;\nonMounted(() => {\n  refresh();\n  timer = window.setInterval(refresh, 3000);\n});\nonUnmounted(() => window.clearInterval(timer));\n</script>\n\n<template>\n  <div class=\"toolbar\">\n    <button class=\"primary\" @click=\"openWizard\">\n      {{ $t(\"projects.newProject\") }}\n    </button>\n  </div>\n\n  <p v-if=\"error\" class=\"error\">{{ error }}</p>\n  <table class=\"grid\">\n    <colgroup>\n      <col class=\"col-dot\" />\n      <col />\n      <col class=\"col-pool\" />\n      <col class=\"col-actions\" />\n    </colgroup>\n    <thead>\n      <tr>\n        <th></th>\n        <th>{{ $t(\"projects.project\") }}</th>\n        <th>{{ $t(\"projects.pool\") }}</th>\n        <th></th>\n      </tr>\n    </thead>\n    <tbody>\n      <tr v-for=\"p in projects\" :key=\"p.name\">\n        <td class=\"cell-dot\">\n          <span class=\"dot\" :class=\"{ on: p.running }\"></span>\n        </td>\n        <td class=\"cell-name\">\n          <strong>{{ p.name }}</strong>\n          <small>{{ p.path }}</small>\n        </td>\n        <td>\n          <select :value=\"p.pool ?? ''\" @change=\"assign(p, $event)\">\n            <option value=\"\" disabled>{{ $t(\"projects.noPool\") }}</option>\n            <option v-for=\"pool in pools\" :key=\"pool.name\" :value=\"pool.name\">\n              {{ pool.name }}\n            </option>\n          </select>\n        </td>\n        <td class=\"cell-actions\">\n          <span class=\"row-actions\">\n            <button\n              class=\"gear\"\n              :title=\"$t('projects.terminalSettings')\"\n              @click=\"openSettings(p)\"\n            >\n              ⚙︎\n            </button>\n            <button\n              class=\"gear danger\"\n              :disabled=\"p.running\"\n              :title=\"p.running ? $t('projects.deleteRunning') : $t('projects.delete')\"\n              @click=\"askDelete(p)\"\n            >\n              🗑\n            </button>\n            <button v-if=\"p.running\" class=\"stop\" @click=\"stop(p)\">\n              {{ $t(\"projects.stop\") }}\n            </button>\n            <button\n              v-else\n              class=\"start\"\n              :disabled=\"!poolReady(p)\"\n              :title=\"startBlockedReason(p) && $t(startBlockedReason(p)!)\"\n              @click=\"openTerminal(p)\"\n            >\n              {{ $t(\"projects.start\") }}\n            </button>\n          </span>\n        </td>\n      </tr>\n    </tbody>\n  </table>\n\n  <div v-if=\"wizard\" class=\"overlay\" @click.self=\"wizard = null\">\n    <form class=\"dialog\" @submit.prevent=\"createProject\">\n      <h3>{{ $t(\"projects.wizardTitle\") }}</h3>\n      <label class=\"field\">\n        {{ $t(\"projects.name\") }}\n        <input v-model=\"wizard.name\" autofocus required />\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.pool\") }}\n        <select v-model=\"wizard.pool\">\n          <option value=\"\">{{ $t(\"projects.noPool\") }}</option>\n          <option v-for=\"pool in pools\" :key=\"pool.name\" :value=\"pool.name\">\n            {{ pool.name }}\n          </option>\n        </select>\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.workDir\") }}\n        <span class=\"icon-row\">\n          <select v-model=\"wizard.workDirMode\">\n            <option value=\"none\">{{ $t(\"projects.workDirNone\") }}</option>\n            <option value=\"default\">\n              ~/projects/{{ wizard.name.trim() || \"…\" }}\n            </option>\n            <option value=\"custom\">{{ $t(\"projects.workDirCustom\") }}</option>\n          </select>\n          <button\n            v-if=\"wizard.workDirMode === 'custom'\"\n            type=\"button\"\n            @click=\"pickWorkDir\"\n          >\n            {{ $t(\"projects.chooseFolder\") }}\n          </button>\n        </span>\n      </label>\n      <label v-if=\"wizard.workDirMode === 'custom' && wizard.workDir\" class=\"field\">\n        <span></span>\n        <span class=\"icon-path\">{{ wizard.workDir }}</span>\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.title\") }}\n        <input v-model=\"wizard.title\" :placeholder=\"wizard.name.trim()\" />\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.theme\") }}\n        <select v-model=\"wizard.theme\">\n          <option v-for=\"[value, label] in THEME_NAMES\" :key=\"value\" :value=\"value\">\n            {{ label }}\n          </option>\n        </select>\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.todo\") }}\n        <span class=\"checkline\">\n          <input v-model=\"wizard.todo\" type=\"checkbox\" />\n          {{ $t(\"projects.todoDesc\") }}\n        </span>\n      </label>\n      <p class=\"hint\">{{ $t(\"projects.wizardHint\") }}</p>\n      <div class=\"actions\">\n        <button type=\"button\" @click=\"wizard = null\">\n          {{ $t(\"projects.cancel\") }}\n        </button>\n        <button\n          type=\"submit\"\n          class=\"primary\"\n          :disabled=\"\n            wizard.name.trim() === '' ||\n            (wizard.workDirMode === 'custom' && !wizard.workDir)\n          \"\n        >\n          {{ $t(\"projects.create\") }}\n        </button>\n      </div>\n    </form>\n  </div>\n\n  <div v-if=\"pendingDelete\" class=\"overlay\" @click.self=\"pendingDelete = null\">\n    <div class=\"dialog\">\n      <h3>{{ $t(\"projects.deleteTitle\", { name: pendingDelete.name }) }}</h3>\n      <p class=\"hint\">{{ $t(\"projects.deleteWarning\", { name: pendingDelete.name }) }}</p>\n      <template v-if=\"pendingDelete.workDirs.length\">\n        <label class=\"checkline\">\n          <input v-model=\"pendingDelete.deleteWorkDirs\" type=\"checkbox\" />\n          {{ $t(\"projects.deleteWorkDirs\") }}\n        </label>\n        <ul class=\"affected\">\n          <li v-for=\"wd in pendingDelete.workDirs\" :key=\"wd\">{{ wd }}</li>\n        </ul>\n        <p v-if=\"!pendingDelete.deleteWorkDirs\" class=\"hint\">\n          {{ $t(\"projects.workDirsStay\") }}\n        </p>\n      </template>\n      <div class=\"actions\">\n        <button type=\"button\" @click=\"pendingDelete = null\">\n          {{ $t(\"projects.cancel\") }}\n        </button>\n        <button class=\"danger\" @click=\"confirmDelete\">\n          {{ $t(\"projects.delete\") }}\n        </button>\n      </div>\n    </div>\n  </div>\n\n  <div v-if=\"settings\" class=\"overlay\">\n    <div class=\"dialog\">\n      <h3>{{ $t(\"projects.terminal\", { name: settings.name }) }}</h3>\n      <label class=\"field\">\n        {{ $t(\"projects.title\") }}\n        <input v-model=\"settings.title\" :placeholder=\"settings.name\" />\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.theme\") }}\n        <select v-model=\"settings.theme\">\n          <option v-for=\"[value, label] in THEME_NAMES\" :key=\"value\" :value=\"value\">\n            {{ label }}\n          </option>\n        </select>\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.dockIcon\") }}\n        <span class=\"icon-row\">\n          <button @click=\"pickIcon\">{{ $t(\"projects.chooseFile\") }}</button>\n          <button v-if=\"settings.icon\" @click=\"settings.icon = null\">\n            {{ $t(\"projects.remove\") }}\n          </button>\n          <span v-if=\"settings.icon\" class=\"icon-path hover-pop\">\n            {{ settings.icon.split(\"/\").pop() }}\n            <span class=\"pop pop-path\">{{ settings.icon }}</span>\n          </span>\n          <span v-else class=\"icon-path\">{{ $t(\"projects.defaultIcon\") }}</span>\n        </span>\n      </label>\n      <label class=\"field\">\n        {{ $t(\"projects.todo\") }}\n        <span class=\"checkline\">\n          <input v-model=\"settings.todo\" type=\"checkbox\" />\n          {{ $t(\"projects.todoDesc\") }}\n        </span>\n      </label>\n      <p class=\"hint\">{{ $t(\"projects.appliesNextStart\") }}</p>\n      <div class=\"actions\">\n        <button @click=\"settings = null\">{{ $t(\"projects.cancel\") }}</button>\n        <button class=\"primary\" @click=\"saveSettings\">\n          {{ $t(\"projects.save\") }}\n        </button>\n      </div>\n    </div>\n  </div>\n\n  <div v-if=\"pending\" class=\"overlay\">\n    <div class=\"dialog\">\n      <h3>{{ $t(\"projects.stillRunning\", { name: pending.name }) }}</h3>\n      <p>{{ $t(\"projects.poolChangeSaved\") }}</p>\n      <div class=\"pools\">\n        <span class=\"chip\">{{ pending.from ?? $t(\"projects.noPoolAssigned\") }}</span>\n        <span class=\"arrow\">→</span>\n        <span class=\"chip new\">{{ pending.to }}</span>\n      </div>\n      <p class=\"hint\">{{ $t(\"projects.restartHint\") }}</p>\n      <div class=\"actions\">\n        <button @click=\"pending = null\">{{ $t(\"projects.keepRunning\") }}</button>\n        <button class=\"primary\" :disabled=\"restarting\" @click=\"restartNow\">\n          {{ restarting ? $t(\"projects.restarting\") : $t(\"projects.restartNow\") }}\n        </button>\n      </div>\n    </div>\n  </div>\n</template>\n","numLines":518,"startLine":1,"totalLines":518}},"sourceToolAssistantUUID":"80c4c380-1321-4e2f-b558-1132c08f9166","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"type":"last-prompt","lastPrompt":"ok -- andere Frage können wir die icons der Projekte in die übersich aufnhemen  Erhöht die lesabarkeit dutlich und du kopierst die icons in die config? --> die müssen mitgesynct werden","leafUuid":"72a18263-c89b-46d5-ad0f-798e25053c16","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a"}
{"type":"ai-title","aiTitle":"Vertex AI setup und first steps","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a"}
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{"parentUuid":"f22f0038-3eb1-48e7-a004-35fd28abac38","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0138g3K85fLBDSwmfQ9jkDdx","type":"tool_result","content":"lib.rs\nmain.rs\nterminal.rs\n/home/marcuh/projects/ai-control/src-tauri/src/terminal.rs:51:pub fn set_dock_icon(path: &str) {\n/home/marcuh/projects/ai-control/src-tauri/src/terminal.rs:56:  let mtm = MainThreadMarker::new().expect(\"set_dock_icon läuft nicht auf dem Main-Thread\");\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:82:  pub icon: Option<String>,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:89:    self.theme.is_none() && self.icon.is_none() && self.title.is_none()\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1028:  icon: Option<String>,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1031:  set_terminal_config_in(&Paths::real(), &project, TerminalConfig { theme, icon, title })\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1160:      let icon = terminal_config(&project)\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1162:        .icon;\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1170:            if let Some(icon) = icon.as_deref() {\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1171:              terminal::set_dock_icon(icon);\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1220:        // include_bytes! statt default_window_icon: cargo trackt die Datei,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1222:        .icon(tauri::image::Image::from_bytes(include_bytes!(\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1223:          \"../icons/128x128.png\"\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1226:        .icon_as_template(true)\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1465:        icon: None,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1738:      TerminalConfig { theme: Some(\"dracula\".into()), icon: None, title: None },","is_error":false}]},"uuid":"8eb5037d-43b6-4e5f-8e12-07e798fa45e5","timestamp":"2026-07-05T08:50:27.431Z","toolUseResult":{"stdout":"lib.rs\nmain.rs\nterminal.rs\n/home/marcuh/projects/ai-control/src-tauri/src/terminal.rs:51:pub fn set_dock_icon(path: &str) {\n/home/marcuh/projects/ai-control/src-tauri/src/terminal.rs:56:  let mtm = MainThreadMarker::new().expect(\"set_dock_icon läuft nicht auf dem Main-Thread\");\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:82:  pub icon: Option<String>,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:89:    self.theme.is_none() && self.icon.is_none() && self.title.is_none()\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1028:  icon: Option<String>,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1031:  set_terminal_config_in(&Paths::real(), &project, TerminalConfig { theme, icon, title })\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1160:      let icon = terminal_config(&project)\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1162:        .icon;\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1170:            if let Some(icon) = icon.as_deref() {\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1171:              terminal::set_dock_icon(icon);\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1220:        // include_bytes! statt default_window_icon: cargo trackt die Datei,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1222:        .icon(tauri::image::Image::from_bytes(include_bytes!(\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1223:          \"../icons/128x128.png\"\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1226:        .icon_as_template(true)\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1465:        icon: None,\n/home/marcuh/projects/ai-control/src-tauri/src/lib.rs:1738:      TerminalConfig { theme: Some(\"dracula\".into()), icon: None, title: None },","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"f22f0038-3eb1-48e7-a004-35fd28abac38","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
{"parentUuid":"8eb5037d-43b6-4e5f-8e12-07e798fa45e5","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_01UCBDrzsxYfJLErPznsC1Ey","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_0129EBcPds1nCcwhu1q1soaB","name":"Bash","input":{"command":"grep -n \"set_terminal_config_in\\|fn terminal_config\\|struct Paths\\|fn real\\|config_dir\\|ai-control.json\\|ai_control_json\\|fn list_projects\" /home/marcuh/projects/ai-control/src-tauri/src/lib.rs | head -30","description":"Locate config paths and relevant functions"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":1356,"cache_read_input_tokens":349814,"output_tokens":181,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1356,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":181,"cache_read_input_tokens":349814,"cache_creation_input_tokens":1356,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1356},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011Ccid9i5aQKReiZZa8d7Cg","type":"assistant","uuid":"98a70275-ddf7-41f5-9c5f-72d7ca918f92","timestamp":"2026-07-05T08:50:33.702Z","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
{"parentUuid":"98a70275-ddf7-41f5-9c5f-72d7ca918f92","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0129EBcPds1nCcwhu1q1soaB","type":"tool_result","content":"18:const PROJECT_FILE: &str = \"ai-control.json\";\n21:struct Paths {\n26:  fn real() -> Self {\n36:  fn config_dir(&self) -> PathBuf {\n41:    self.config_dir().join(\"pools\")\n128:  fs::read_to_string(paths.config_dir().join(APP_SETTINGS_FILE))\n137:  let path = paths.config_dir().join(APP_SETTINGS_FILE);\n143:  fs::create_dir_all(paths.config_dir()).map_err(|e| e.to_string())?;\n222:fn list_projects_in(paths: &Paths) -> Result<Vec<Project>, String> {\n350:/// Berechtigungen), ai-control.json mit Pool/Terminal-Config. Kein git init —\n505:fn set_terminal_config_in(\n516:pub(crate) fn terminal_config(project: &str) -> Result<TerminalConfig, String> {\n934:fn list_projects() -> Result<Vec<Project>, String> {\n1031:  set_terminal_config_in(&Paths::real(), &project, TerminalConfig { theme, icon, title })\n1549:    // ohne Pool und Terminal-Config entsteht keine ai-control.json\n1735:    set_terminal_config_in(","is_error":false}]},"uuid":"f086363f-f708-419c-b3be-184210ff76d7","timestamp":"2026-07-05T08:50:33.805Z","toolUseResult":{"stdout":"18:const PROJECT_FILE: &str = \"ai-control.json\";\n21:struct Paths {\n26:  fn real() -> Self {\n36:  fn config_dir(&self) -> PathBuf {\n41:    self.config_dir().join(\"pools\")\n128:  fs::read_to_string(paths.config_dir().join(APP_SETTINGS_FILE))\n137:  let path = paths.config_dir().join(APP_SETTINGS_FILE);\n143:  fs::create_dir_all(paths.config_dir()).map_err(|e| e.to_string())?;\n222:fn list_projects_in(paths: &Paths) -> Result<Vec<Project>, String> {\n350:/// Berechtigungen), ai-control.json mit Pool/Terminal-Config. Kein git init —\n505:fn set_terminal_config_in(\n516:pub(crate) fn terminal_config(project: &str) -> Result<TerminalConfig, String> {\n934:fn list_projects() -> Result<Vec<Project>, String> {\n1031:  set_terminal_config_in(&Paths::real(), &project, TerminalConfig { theme, icon, title })\n1549:    // ohne Pool und Terminal-Config entsteht keine ai-control.json\n1735:    set_terminal_config_in(","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"98a70275-ddf7-41f5-9c5f-72d7ca918f92","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
{"parentUuid":"f086363f-f708-419c-b3be-184210ff76d7","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_01RUHEZk6Z54r9BX7VNGUCpj","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01UCovuutLwNmfyijBNUXUrm","name":"Read","input":{"file_path":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","offset":14,"limit":60},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":619,"cache_read_input_tokens":351170,"output_tokens":245,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":619,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":245,"cache_read_input_tokens":351170,"cache_creation_input_tokens":619,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":619},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CcidABJBP7Lwe3tJ2Fk3k","type":"assistant","uuid":"87789902-d43c-423f-96eb-41a8f4d1ed6c","timestamp":"2026-07-05T08:50:41.018Z","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
{"parentUuid":"87789902-d43c-423f-96eb-41a8f4d1ed6c","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01UCovuutLwNmfyijBNUXUrm","type":"tool_result","content":"14\t/// CLAUDE_CONFIG_DIR. oauth-Credentials verwaltet claude selbst (Keychain);\n15\t/// die App speichert keine Tokens.\n16\tconst APIKEY_FILE: &str = \"apikey\";\n17\tconst POOL_FILE: &str = \"pool.json\";\n18\tconst PROJECT_FILE: &str = \"ai-control.json\";\n19\t\n20\t/// Wurzelpfade; in Tests mit temporärem home instanziierbar.\n21\tstruct Paths {\n22\t  home: PathBuf,\n23\t}\n24\t\n25\timpl Paths {\n26\t  fn real() -> Self {\n27\t    Paths {\n28\t      home: PathBuf::from(std::env::var(\"HOME\").expect(\"HOME nicht gesetzt\")),\n29\t    }\n30\t  }\n31\t\n32\t  fn projects_dir(&self) -> PathBuf {\n33\t    self.home.join(\"claude-projects\")\n34\t  }\n35\t\n36\t  fn config_dir(&self) -> PathBuf {\n37\t    self.home.join(\".config\").join(\"ai-control\")\n38\t  }\n39\t\n40\t  fn pools_dir(&self) -> PathBuf {\n41\t    self.config_dir().join(\"pools\")\n42\t  }\n43\t\n44\t  fn pool_dir(&self, pool: &str) -> PathBuf {\n45\t    self.pools_dir().join(pool)\n46\t  }\n47\t\n48\t  fn project_config(&self, project: &str) -> PathBuf {\n49\t    self.projects_dir().join(project).join(PROJECT_FILE)\n50\t  }\n51\t}\n52\t\n53\t#[derive(Serialize)]\n54\tstruct Project {\n55\t  name: String,\n56\t  path: String,\n57\t  pool: Option<String>,\n58\t  running: bool,\n59\t  terminal: TerminalConfig,\n60\t}\n61\t\n62\t#[derive(Serialize, Deserialize)]\n63\tstruct Pool {\n64\t  name: String,\n65\t  #[serde(rename = \"credentialType\")]\n66\t  credential_type: String,\n67\t}\n68\t\n69\t#[derive(Serialize, Deserialize, Default)]\n70\tstruct ProjectConfig {\n71\t  #[serde(default, skip_serializing_if = \"Option::is_none\")]\n72\t  pool: Option<String>,\n73\t  #[serde(default, skip_serializing_if = \"TerminalConfig::is_empty\")]"}]},"uuid":"061e1f8d-71d6-4c90-a0f3-a2e2d31933de","timestamp":"2026-07-05T08:50:41.048Z","toolUseResult":{"type":"text","file":{"filePath":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","content":"/// CLAUDE_CONFIG_DIR. oauth-Credentials verwaltet claude selbst (Keychain);\n/// die App speichert keine Tokens.\nconst APIKEY_FILE: &str = \"apikey\";\nconst POOL_FILE: &str = \"pool.json\";\nconst PROJECT_FILE: &str = \"ai-control.json\";\n\n/// Wurzelpfade; in Tests mit temporärem home instanziierbar.\nstruct Paths {\n  home: PathBuf,\n}\n\nimpl Paths {\n  fn real() -> Self {\n    Paths {\n      home: PathBuf::from(std::env::var(\"HOME\").expect(\"HOME nicht gesetzt\")),\n    }\n  }\n\n  fn projects_dir(&self) -> PathBuf {\n    self.home.join(\"claude-projects\")\n  }\n\n  fn config_dir(&self) -> PathBuf {\n    self.home.join(\".config\").join(\"ai-control\")\n  }\n\n  fn pools_dir(&self) -> PathBuf {\n    self.config_dir().join(\"pools\")\n  }\n\n  fn pool_dir(&self, pool: &str) -> PathBuf {\n    self.pools_dir().join(pool)\n  }\n\n  fn project_config(&self, project: &str) -> PathBuf {\n    self.projects_dir().join(project).join(PROJECT_FILE)\n  }\n}\n\n#[derive(Serialize)]\nstruct Project {\n  name: String,\n  path: String,\n  pool: Option<String>,\n  running: bool,\n  terminal: TerminalConfig,\n}\n\n#[derive(Serialize, Deserialize)]\nstruct Pool {\n  name: String,\n  #[serde(rename = \"credentialType\")]\n  credential_type: String,\n}\n\n#[derive(Serialize, Deserialize, Default)]\nstruct ProjectConfig {\n  #[serde(default, skip_serializing_if = \"Option::is_none\")]\n  pool: Option<String>,\n  #[serde(default, skip_serializing_if = \"TerminalConfig::is_empty\")]","numLines":60,"startLine":14,"totalLines":1887}},"sourceToolAssistantUUID":"87789902-d43c-423f-96eb-41a8f4d1ed6c","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"21e545ff-b03b-406a-b4af-b7f255c36a55","isSidechain":false,"promptId":"622c5537-7c9a-49d8-a269-890d9395b7e7","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01LfEW6dKL4fmwdBkG81kARH","type":"tool_result","content":"495\tfn unassign_pool_in(paths: &Paths, project: &str) -> Result<(), String> {\n496\t  let mut cfg = read_project_config_in(paths, project)?;\n497\t  cfg.pool = None;\n498\t  if cfg.terminal.is_empty() {\n499\t    let cfg_path = paths.project_config(project);\n500\t    return fs::remove_file(&cfg_path).map_err(|e| format!(\"{}: {e}\", cfg_path.display()));\n501\t  }\n502\t  write_project_config_in(paths, project, &cfg)\n503\t}\n504\t\n505\tfn set_terminal_config_in(\n506\t  paths: &Paths,\n507\t  project: &str,\n508\t  terminal: TerminalConfig,\n509\t) -> Result<(), String> {\n510\t  let mut cfg = read_project_config_in(paths, project)?;\n511\t  cfg.terminal = terminal;\n512\t  write_project_config_in(paths, project, &cfg)\n513\t}\n514\t\n515\t/// Terminal-Einstellungen eines Projekts, für den Terminal-Prozess.\n516\tpub(crate) fn terminal_config(project: &str) -> Result<TerminalConfig, String> {\n517\t  Ok(read_project_config_in(&Paths::real(), project)?.terminal)\n518\t}\n519\t\n520\t/// Namen aller Projekte, die `pool` zugeordnet haben.\n521\tfn projects_using_pool(paths: &Paths, pool: &str) -> Result<Vec<String>, String> {\n522\t  let mut users = Vec::new();\n523\t  let entries = fs::read_dir(paths.projects_dir()).map_err(|e| e.to_string())?;\n524\t  for entry in entries {\n525\t    let entry = entry.map_err(|e| e.to_string())?;\n526\t    let cfg_path = entry.path().join(PROJECT_FILE);\n527\t    if !cfg_path.is_file() {\n528\t      continue;\n529\t    }\n530\t    let raw = fs::read_to_string(&cfg_path).map_err(|e| e.to_string())?;\n531\t    let cfg: ProjectConfig = serde_json::from_str(&raw).map_err(|e| e.to_string())?;\n532\t    if cfg.pool.as_deref() == Some(pool) {\n533\t      users.push(entry.file_name().to_string_lossy().into_owned());\n534\t    }"}]},"uuid":"78c60edc-847d-4001-88ef-649a41c4ffc7","timestamp":"2026-07-05T08:50:41.562Z","toolUseResult":{"type":"text","file":{"filePath":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","content":"fn unassign_pool_in(paths: &Paths, project: &str) -> Result<(), String> {\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.pool = None;\n  if cfg.terminal.is_empty() {\n    let cfg_path = paths.project_config(project);\n    return fs::remove_file(&cfg_path).map_err(|e| format!(\"{}: {e}\", cfg_path.display()));\n  }\n  write_project_config_in(paths, project, &cfg)\n}\n\nfn set_terminal_config_in(\n  paths: &Paths,\n  project: &str,\n  terminal: TerminalConfig,\n) -> Result<(), String> {\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.terminal = terminal;\n  write_project_config_in(paths, project, &cfg)\n}\n\n/// Terminal-Einstellungen eines Projekts, für den Terminal-Prozess.\npub(crate) fn terminal_config(project: &str) -> Result<TerminalConfig, String> {\n  Ok(read_project_config_in(&Paths::real(), project)?.terminal)\n}\n\n/// Namen aller Projekte, die `pool` zugeordnet haben.\nfn projects_using_pool(paths: &Paths, pool: &str) -> Result<Vec<String>, String> {\n  let mut users = Vec::new();\n  let entries = fs::read_dir(paths.projects_dir()).map_err(|e| e.to_string())?;\n  for entry in entries {\n    let entry = entry.map_err(|e| e.to_string())?;\n    let cfg_path = entry.path().join(PROJECT_FILE);\n    if !cfg_path.is_file() {\n      continue;\n    }\n    let raw = fs::read_to_string(&cfg_path).map_err(|e| e.to_string())?;\n    let cfg: ProjectConfig = serde_json::from_str(&raw).map_err(|e| e.to_string())?;\n    if cfg.pool.as_deref() == Some(pool) {\n      users.push(entry.file_name().to_string_lossy().into_owned());\n    }","numLines":40,"startLine":495,"totalLines":1887}},"sourceToolAssistantUUID":"21e545ff-b03b-406a-b4af-b7f255c36a55","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"18368ce3-991d-49ed-9269-7e5dc0f35908","isSidechain":false,"promptId":"33b0ea7c-477b-4282-8702-caf1aff9747c","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01L1xufqNWfd4FawiDYPWjEv","type":"tool_result","content":"1140\t/// sonst würde das Transkript der laufenden Session ersetzt.\n1141\t#[tauri::command]\n1142\tfn link_pool_runtime(pool: String) -> Result<(), String> {\n1143\t  let paths = Paths::real();\n1144\t  if !running_projects_using_pool(&paths, &pool)?.is_empty() {\n1145\t    return Err(format!(\"{pool} wird benutzt — erst Session beenden\"));\n1146\t  }\n1147\t  link_pool_runtime_in(&paths, &pool)\n1148\t}\n1149\t\n1150\t#[cfg_attr(mobile, tauri::mobile_entry_point)]\n1151\tpub fn run() {\n1152\t  // generate_context! darf pro Crate nur einmal expandieren (_EMBED_INFO_PLIST).\n1153\t  let context = tauri::generate_context!();\n1154\t  let mut args = std::env::args().skip(1);\n1155\t  match args.next().as_deref() {\n1156\t    // `app --terminal <projekt>`: eigener Prozess pro Terminal-Fenster,\n1157\t    // damit jedes Terminal ein eigenes Dock-Icon bekommt.\n1158\t    Some(\"--terminal\") => {\n1159\t      let project = args.next().expect(\"--terminal braucht einen Projektnamen\");\n1160\t      let icon = terminal_config(&project)\n1161\t        .expect(\"Projekt-Config nicht lesbar\")\n1162\t        .icon;\n1163\t      terminal_builder(project)\n1164\t        .build(context)\n1165\t        .expect(\"error while building tauri application\")\n1166\t        // Das Dock-Icon erst nach dem App-Start setzen: in setup() gesetzt\n1167\t        // überschreibt macOS es beim Anlegen des Dock-Tiles wieder.\n1168\t        .run(move |_app, event| {\n1169\t          if let tauri::RunEvent::Ready = event {\n1170\t            if let Some(icon) = icon.as_deref() {\n1171\t              terminal::set_dock_icon(icon);\n1172\t            }\n1173\t          }\n1174\t        });\n1175\t    }\n1176\t    _ => main_builder()\n1177\t      .run(context)\n1178\t      .expect(\"error while running tauri application\"),\n1179\t  }\n1180\t}\n1181\t\n1182\t/// Haupt-App: reine Tray-App ohne Dock-Eintrag.\n1183\tfn main_builder() -> tauri::Builder<tauri::Wry> {\n1184\t  use tauri::Manager;\n1185\t\n1186\t  tauri::Builder::default()\n1187\t    .plugin(tauri_plugin_autostart::init(\n1188\t      tauri_plugin_autostart::MacosLauncher::LaunchAgent,\n1189\t      None,\n1190\t    ))\n1191\t    .plugin(tauri_plugin_dialog::init())\n1192\t    .setup(|app| {\n1193\t      if cfg!(debug_assertions) {\n1194\t        app.handle().plugin(\n1195\t          tauri_plugin_log::Builder::default()\n1196\t            .level(log::LevelFilter::Info)\n1197\t            .build(),\n1198\t        )?;\n1199\t      }"}]},"uuid":"3c071655-4049-4873-a937-269e781a4189","timestamp":"2026-07-05T08:52:46.894Z","toolUseResult":{"type":"text","file":{"filePath":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","content":"/// sonst würde das Transkript der laufenden Session ersetzt.\n#[tauri::command]\nfn link_pool_runtime(pool: String) -> Result<(), String> {\n  let paths = Paths::real();\n  if !running_projects_using_pool(&paths, &pool)?.is_empty() {\n    return Err(format!(\"{pool} wird benutzt — erst Session beenden\"));\n  }\n  link_pool_runtime_in(&paths, &pool)\n}\n\n#[cfg_attr(mobile, tauri::mobile_entry_point)]\npub fn run() {\n  // generate_context! darf pro Crate nur einmal expandieren (_EMBED_INFO_PLIST).\n  let context = tauri::generate_context!();\n  let mut args = std::env::args().skip(1);\n  match args.next().as_deref() {\n    // `app --terminal <projekt>`: eigener Prozess pro Terminal-Fenster,\n    // damit jedes Terminal ein eigenes Dock-Icon bekommt.\n    Some(\"--terminal\") => {\n      let project = args.next().expect(\"--terminal braucht einen Projektnamen\");\n      let icon = terminal_config(&project)\n        .expect(\"Projekt-Config nicht lesbar\")\n        .icon;\n      terminal_builder(project)\n        .build(context)\n        .expect(\"error while building tauri application\")\n        // Das Dock-Icon erst nach dem App-Start setzen: in setup() gesetzt\n        // überschreibt macOS es beim Anlegen des Dock-Tiles wieder.\n        .run(move |_app, event| {\n          if let tauri::RunEvent::Ready = event {\n            if let Some(icon) = icon.as_deref() {\n              terminal::set_dock_icon(icon);\n            }\n          }\n        });\n    }\n    _ => main_builder()\n      .run(context)\n      .expect(\"error while running tauri application\"),\n  }\n}\n\n/// Haupt-App: reine Tray-App ohne Dock-Eintrag.\nfn main_builder() -> tauri::Builder<tauri::Wry> {\n  use tauri::Manager;\n\n  tauri::Builder::default()\n    .plugin(tauri_plugin_autostart::init(\n      tauri_plugin_autostart::MacosLauncher::LaunchAgent,\n      None,\n    ))\n    .plugin(tauri_plugin_dialog::init())\n    .setup(|app| {\n      if cfg!(debug_assertions) {\n        app.handle().plugin(\n          tauri_plugin_log::Builder::default()\n            .level(log::LevelFilter::Info)\n            .build(),\n        )?;\n      }","numLines":60,"startLine":1140,"totalLines":1887}},"sourceToolAssistantUUID":"18368ce3-991d-49ed-9269-7e5dc0f35908","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"dd206207-96f0-4fc8-94bd-d43aa7bba2f3","isSidechain":false,"promptId":"33b0ea7c-477b-4282-8702-caf1aff9747c","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01NnNUfDyUkutgweDJjagTsp","type":"tool_result","content":"1248:    .invoke_handler(tauri::generate_handler![\n1249-      list_projects,\n1250-      create_project_full,\n1251-      delete_project,\n1252-      project_work_dirs,\n1253-      list_pools,\n1254-      create_oauth_pool,\n1255-      create_apikey_pool,\n1256-      delete_pool,\n1257-      assign_pool,\n1258-      unassign_pool,\n1259-      set_terminal_config,\n1260-      todo_state,\n1261-      set_todo,\n1262-      usage_stats,\n1263-      stop_project,\n1264-      restart_project,\n1265-      sync_setting,\n1266-      set_sync_setting,\n1267-      link_pool_runtime,\n1268-      oauth_login,\n1269-      keychain_status,\n1270-      set_apikey,\n1271-      terminal::open_terminal\n1272-    ])\n1273-}\n1274-\n1275-/// Terminal-Prozess: ein Fenster mit eigener PTY; Activation-Policy bleibt\n1276-/// Regular, dadurch Dock-Icon und Cmd-Tab-Eintrag pro Terminal.\n1277-fn terminal_builder(project: String) -> tauri::Builder<tauri::Wry> {\n1278-  tauri::Builder::default()\n--\n1291:    .invoke_handler(tauri::generate_handler![\n1292-      terminal::term_start,\n1293-      terminal::term_log,\n1294-      terminal::term_write,\n1295-      terminal::term_resize,\n1296-      // Pool-Chip im Terminal-Header braucht die Projektliste auch hier.\n1297-      list_projects\n1298-    ])\n1299-}\n1300-\n1301-// ---------- Tests ----------\n1302-\n1303-#[cfg(test)]\n390:.cell-name strong {\n391-  font-family: var(--mono);\n392-  font-size: 0.85rem;\n393-  font-weight: 500;\n394-}\n395-\n396:.cell-name small {\n397-  display: block;\n398-  font-family: var(--mono);\n399-  font-size: 0.7rem;\n400-  color: var(--overlay);\n401-  margin-top: 0.2rem;\n402-  overflow: hidden;\n403-  text-overflow: ellipsis;\n404-  white-space: nowrap;\n405-}\n406-\n407-.cell-actions {\n408-  text-align: right;","is_error":false}]},"uuid":"6cfb74d0-d2ab-440e-97b3-644c827f4b21","timestamp":"2026-07-05T08:53:18.089Z","toolUseResult":{"stdout":"1248:    .invoke_handler(tauri::generate_handler![\n1249-      list_projects,\n1250-      create_project_full,\n1251-      delete_project,\n1252-      project_work_dirs,\n1253-      list_pools,\n1254-      create_oauth_pool,\n1255-      create_apikey_pool,\n1256-      delete_pool,\n1257-      assign_pool,\n1258-      unassign_pool,\n1259-      set_terminal_config,\n1260-      todo_state,\n1261-      set_todo,\n1262-      usage_stats,\n1263-      stop_project,\n1264-      restart_project,\n1265-      sync_setting,\n1266-      set_sync_setting,\n1267-      link_pool_runtime,\n1268-      oauth_login,\n1269-      keychain_status,\n1270-      set_apikey,\n1271-      terminal::open_terminal\n1272-    ])\n1273-}\n1274-\n1275-/// Terminal-Prozess: ein Fenster mit eigener PTY; Activation-Policy bleibt\n1276-/// Regular, dadurch Dock-Icon und Cmd-Tab-Eintrag pro Terminal.\n1277-fn terminal_builder(project: String) -> tauri::Builder<tauri::Wry> {\n1278-  tauri::Builder::default()\n--\n1291:    .invoke_handler(tauri::generate_handler![\n1292-      terminal::term_start,\n1293-      terminal::term_log,\n1294-      terminal::term_write,\n1295-      terminal::term_resize,\n1296-      // Pool-Chip im Terminal-Header braucht die Projektliste auch hier.\n1297-      list_projects\n1298-    ])\n1299-}\n1300-\n1301-// ---------- Tests ----------\n1302-\n1303-#[cfg(test)]\n390:.cell-name strong {\n391-  font-family: var(--mono);\n392-  font-size: 0.85rem;\n393-  font-weight: 500;\n394-}\n395-\n396:.cell-name small {\n397-  display: block;\n398-  font-family: var(--mono);\n399-  font-size: 0.7rem;\n400-  color: var(--overlay);\n401-  margin-top: 0.2rem;\n402-  overflow: hidden;\n403-  text-overflow: ellipsis;\n404-  white-space: nowrap;\n405-}\n406-\n407-.cell-actions {\n408-  text-align: right;","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"dd206207-96f0-4fc8-94bd-d43aa7bba2f3","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"52acf964-daae-4fa9-826a-34ca46f7dae4","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_01Nb1DgBRA4agiwQbTbgXADp","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01123QRFvq2HwQM6Tw7smMVV","name":"Edit","input":{"replace_all":false,"file_path":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","old_string":"fn set_terminal_config_in(\n  paths: &Paths,\n  project: &str,\n  terminal: TerminalConfig,\n) -> Result<(), String> {\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.terminal = terminal;\n  write_project_config_in(paths, project, &cfg)\n}","new_string":"fn set_terminal_config_in(\n  paths: &Paths,\n  project: &str,\n  mut terminal: TerminalConfig,\n) -> Result<(), String> {\n  // Absolut gewählte Icons in den Projektordner kopieren und relativ\n  // speichern — so wird das Icon mit dem Projekt-Repo gesynct.\n  if let Some(icon) = terminal.icon.as_deref() {\n    if icon.starts_with('/') {\n      let src = PathBuf::from(icon);\n      let ext = src\n        .extension()\n        .and_then(|e| e.to_str())\n        .unwrap_or(\"png\")\n        .to_lowercase();\n      let name = format!(\"icon.{ext}\");\n      let dest = paths.projects_dir().join(project).join(&name);\n      if src != dest {\n        fs::copy(&src, &dest).map_err(|e| format!(\"{}: {e}\", src.display()))?;\n      }\n      terminal.icon = Some(name);\n    }\n  }\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.terminal = terminal;\n  write_project_config_in(paths, project, &cfg)\n}\n\n/// Icon-Pfad einer Projekt-Config auflösen: relative Namen liegen im Projektordner.\nfn resolve_icon_path(paths: &Paths, project: &str, icon: &str) -> PathBuf {\n  if icon.starts_with('/') {\n    PathBuf::from(icon)\n  } else {\n    paths.projects_dir().join(project).join(icon)\n  }\n}\n\n/// Icon eines Projekts als PNG-data-URL für die Übersicht; ICNS wird per\n/// sips nach PNG konvertiert, weil der Browser ICNS nicht rendert.\n#[tauri::command]\nfn project_icon(project: String) -> Result<Option<String>, String> {\n  use base64::{engine::general_purpose::STANDARD, Engine};\n  let paths = Paths::real();\n  let Some(icon) = read_project_config_in(&paths, &project)?.terminal.icon else {\n    return Ok(None);\n  };\n  let path = resolve_icon_path(&paths, &project, &icon);\n  let is_icns = path\n    .extension()\n    .and_then(|e| e.to_str())\n    .is_some_and(|e| e.eq_ignore_ascii_case(\"icns\"));\n  let png = if is_icns {\n    let tmp = std::env::temp_dir().join(format!(\"ai-control-icon-{project}.png\"));\n    let out = std::process::Command::new(\"sips\")\n      .args([\"-s\", \"format\", \"png\"])\n      .arg(&path)\n      .arg(\"--out\")\n      .arg(&tmp)\n      .output()\n      .map_err(|e| format!(\"sips: {e}\"))?;\n    if !out.status.success() {\n      return Err(format!(\"sips: {}\", String::from_utf8_lossy(&out.stderr)));\n    }\n    let bytes = fs::read(&tmp).map_err(|e| format!(\"{}: {e}\", tmp.display()))?;\n    let _ = fs::remove_file(&tmp);\n    bytes\n  } else {\n    fs::read(&path).map_err(|e| format!(\"{}: {e}\", path.display()))?\n  };\n  Ok(Some(format!(\"data:image/png;base64,{}\", STANDARD.encode(png))))\n}"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":2402,"cache_read_input_tokens":360326,"output_tokens":1401,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2402,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":1401,"cache_read_input_tokens":360326,"cache_creation_input_tokens":2402,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2402},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CcidQSNvsKWudhpv4DfZx","type":"assistant","uuid":"88824779-8ec6-48d2-bc6b-d3b3c66df4b6","timestamp":"2026-07-05T08:54:06.943Z","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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(file state is current in your context — no need to Read it back)"}]},"uuid":"39d22440-da71-47f8-932a-4613df337b5a","timestamp":"2026-07-05T08:54:06.972Z","toolUseResult":{"filePath":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","oldString":"fn set_terminal_config_in(\n  paths: &Paths,\n  project: &str,\n  terminal: TerminalConfig,\n) -> Result<(), String> {\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.terminal = terminal;\n  write_project_config_in(paths, project, &cfg)\n}","newString":"fn set_terminal_config_in(\n  paths: &Paths,\n  project: &str,\n  mut terminal: TerminalConfig,\n) -> Result<(), String> {\n  // Absolut gewählte Icons in den Projektordner kopieren und relativ\n  // speichern — so wird das Icon mit dem Projekt-Repo gesynct.\n  if let Some(icon) = terminal.icon.as_deref() {\n    if icon.starts_with('/') {\n      let src = PathBuf::from(icon);\n      let ext = src\n        .extension()\n        .and_then(|e| e.to_str())\n        .unwrap_or(\"png\")\n        .to_lowercase();\n      let name = format!(\"icon.{ext}\");\n      let dest = paths.projects_dir().join(project).join(&name);\n      if src != dest {\n        fs::copy(&src, &dest).map_err(|e| format!(\"{}: {e}\", src.display()))?;\n      }\n      terminal.icon = Some(name);\n    }\n  }\n  let mut cfg = read_project_config_in(paths, project)?;\n  cfg.terminal = terminal;\n  write_project_config_in(paths, project, &cfg)\n}\n\n/// Icon-Pfad einer Projekt-Config auflösen: relative Namen liegen im Projektordner.\nfn resolve_icon_path(paths: &Paths, project: &str, icon: &str) -> PathBuf {\n  if icon.starts_with('/') {\n    PathBuf::from(icon)\n  } else {\n    paths.projects_dir().join(project).join(icon)\n  }\n}\n\n/// Icon eines Projekts als PNG-data-URL für die Übersicht; ICNS wird per\n/// sips nach PNG konvertiert, weil der Browser ICNS nicht rendert.\n#[tauri::command]\nfn project_icon(project: String) -> Result<Option<String>, String> {\n  use base64::{engine::general_purpose::STANDARD, Engine};\n  let paths = Paths::real();\n  let Some(icon) = read_project_config_in(&paths, &project)?.terminal.icon else {\n    return Ok(None);\n  };\n  let path = resolve_icon_path(&paths, &project, &icon);\n  let is_icns = path\n    .extension()\n    .and_then(|e| e.to_str())\n    .is_some_and(|e| e.eq_ignore_ascii_case(\"icns\"));\n  let png = if is_icns {\n    let tmp = std::env::temp_dir().join(format!(\"ai-control-icon-{project}.png\"));\n    let out = std::process::Command::new(\"sips\")\n      .args([\"-s\", \"format\", \"png\"])\n      .arg(&path)\n      .arg(\"--out\")\n      .arg(&tmp)\n      .output()\n      .map_err(|e| format!(\"sips: {e}\"))?;\n    if !out.status.success() {\n      return Err(format!(\"sips: {}\", String::from_utf8_lossy(&out.stderr)));\n    }\n    let bytes = fs::read(&tmp).map_err(|e| format!(\"{}: {e}\", tmp.display()))?;\n    let _ = fs::remove_file(&tmp);\n    bytes\n  } else {\n    fs::read(&path).map_err(|e| format!(\"{}: {e}\", path.display()))?\n  };\n  Ok(Some(format!(\"data:image/png;base64,{}\", STANDARD.encode(png))))\n}","originalFile":null,"structuredPatch":[{"oldStart":505,"oldLines":13,"newStart":505,"newLines":75,"lines":[" fn set_terminal_config_in(","   paths: &Paths,","   project: &str,","-  terminal: TerminalConfig,","+  mut terminal: TerminalConfig,"," ) -> Result<(), String> {","+  // Absolut gewählte Icons in den Projektordner kopieren und relativ","+  // speichern — so wird das Icon mit dem Projekt-Repo gesynct.","+  if let Some(icon) = terminal.icon.as_deref() {","+    if icon.starts_with('/') {","+      let src = PathBuf::from(icon);","+      let ext = src","+        .extension()","+        .and_then(|e| e.to_str())","+        .unwrap_or(\"png\")","+        .to_lowercase();","+      let name = format!(\"icon.{ext}\");","+      let dest = paths.projects_dir().join(project).join(&name);","+      if src != dest {","+        fs::copy(&src, &dest).map_err(|e| format!(\"{}: {e}\", src.display()))?;","+      }","+      terminal.icon = Some(name);","+    }","+  }","   let mut cfg = read_project_config_in(paths, project)?;","   cfg.terminal = terminal;","   write_project_config_in(paths, project, &cfg)"," }"," ","+/// Icon-Pfad einer Projekt-Config auflösen: relative Namen liegen im Projektordner.","+fn resolve_icon_path(paths: &Paths, project: &str, icon: &str) -> PathBuf {","+  if icon.starts_with('/') {","+    PathBuf::from(icon)","+  } else {","+    paths.projects_dir().join(project).join(icon)","+  }","+}","+","+/// Icon eines Projekts als PNG-data-URL für die Übersicht; ICNS wird per","+/// sips nach PNG konvertiert, weil der Browser ICNS nicht rendert.","+#[tauri::command]","+fn project_icon(project: String) -> Result<Option<String>, String> {","+  use base64::{engine::general_purpose::STANDARD, Engine};","+  let paths = Paths::real();","+  let Some(icon) = read_project_config_in(&paths, &project)?.terminal.icon else {","+    return Ok(None);","+  };","+  let path = resolve_icon_path(&paths, &project, &icon);","+  let is_icns = path","+    .extension()","+    .and_then(|e| e.to_str())","+    .is_some_and(|e| e.eq_ignore_ascii_case(\"icns\"));","+  let png = if is_icns {","+    let tmp = std::env::temp_dir().join(format!(\"ai-control-icon-{project}.png\"));","+    let out = std::process::Command::new(\"sips\")","+      .args([\"-s\", \"format\", \"png\"])","+      .arg(&path)","+      .arg(\"--out\")","+      .arg(&tmp)","+      .output()","+      .map_err(|e| format!(\"sips: {e}\"))?;","+    if !out.status.success() {","+      return Err(format!(\"sips: {}\", String::from_utf8_lossy(&out.stderr)));","+    }","+    let bytes = fs::read(&tmp).map_err(|e| format!(\"{}: {e}\", tmp.display()))?;","+    let _ = fs::remove_file(&tmp);","+    bytes","+  } else {","+    fs::read(&path).map_err(|e| format!(\"{}: {e}\", path.display()))?","+  };","+  Ok(Some(format!(\"data:image/png;base64,{}\", STANDARD.encode(png))))","+}","+"," /// Terminal-Einstellungen eines Projekts, für den Terminal-Prozess."," pub(crate) fn terminal_config(project: &str) -> Result<TerminalConfig, String> {","   Ok(read_project_config_in(&Paths::real(), project)?.terminal)"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"88824779-8ec6-48d2-bc6b-d3b3c66df4b6","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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{"parentUuid":"183a786d-996f-47a2-bd40-21322afaef05","isSidechain":false,"message":{"model":"claude-fable-5","id":"msg_01USDaqZnPZDd75yStY14dfn","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01RbkNqAwC9bEufeP2jwapbM","name":"Edit","input":{"replace_all":false,"file_path":"/home/marcuh/projects/ai-control/src-tauri/src/lib.rs","old_string":"      let icon = terminal_config(&project)\n        .expect(\"Projekt-Config nicht lesbar\")\n        .icon;","new_string":"      let icon = terminal_config(&project)\n        .expect(\"Projekt-Config nicht lesbar\")\n        .icon\n        .map(|i| {\n          resolve_icon_path(&Paths::real(), &project, &i)\n            .to_string_lossy()\n            .into_owned()\n        });"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":131,"cache_creation_input_tokens":1490,"cache_read_input_tokens":362728,"output_tokens":500,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1490,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":131,"output_tokens":500,"cache_read_input_tokens":362728,"cache_creation_input_tokens":1490,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1490},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CcidRthFD5T8CvjyesGeZ","type":"assistant","uuid":"4f81a10a-e9b2-4839-bdb7-243c4644f0d0","timestamp":"2026-07-05T08:54:14.194Z","session_id":"40d78c29-a103-4420-b913-4d49b26def7a","userType":"external","entrypoint":"cli","cwd":"/home/marcuh/claude-projects/ai-control","sessionId":"40d78c29-a103-4420-b913-4d49b26def7a","version":"2.1.201","gitBranch":"main"}
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