HomeDocs changes
Documentation changes
What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
821pages tracked
774 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
148 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
81 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
10,119 of the ledger's changes in api. Show every change
ReadSourcePageWhatLines
22 Sep 2026
161 pages
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api
build-with-claude/claude-in-microsoft-foundry
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build-with-claude/claude-in-microsoft-foundry
This guide shows you how to set up and make API calls to Claude in Microsoft Foundry using one of Anthropic's client SDKs or direct HTTP requests. When you access Claude in Microso
This guide shows you how to set up and make API calls to Claude in Microsoft Foundry using one of Anthropic's client SDKs or direct HTTP requests. When you access Claude in Microso
implementation("com.anthropic:anthropic-java:2.63.0")
implementation("com.anthropic:anthropic-java-foundry:2.63.0")
implementation("com.anthropic:anthropic-java:2.65.0")
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build-with-claude/claude-in-amazon-bedrock
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build-with-claude/claude-in-amazon-bedrock
implementation("com.anthropic:anthropic-java:2.63.0")
implementation("com.anthropic:anthropic-java-bedrock:2.63.0")
implementation("com.anthropic:anthropic-java:2.65.0")
implementation("com.anthropic:anthropic-java-bedrock:2.65.0")
<version>2.63.0</version>
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build-with-claude/citations
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build-with-claude/citations
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
model="claude-opus-5",
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build-with-claude/cache-diagnostics
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build-with-claude/cache-diagnostics
"model": "claude-opus-5",
"model": "claude-opus-5-5",
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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build-with-claude/batch-processing
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build-with-claude/batch-processing
| Claude Opus 5.5 | $2 / MTok | $10 / MTok |
"model": "claude-opus-5",
"model": "claude-opus-5-5",
"model": "claude-opus-5",
"model": "claude-opus-5-5",
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api/service-tiers
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api/service-tiers
Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Cla
Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Cla
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api/rate-limits
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api/rate-limits
| Claude Opus 5.5 | 1,000 | 2,
| Claude Opus 5.5 | 5,000 | 5,
| Claude Opus 5.5 | 10,000 | 10
*2 Opus rate limit is a total limit that applies to combined traffic across Claude Opus 4.8, Opus 4.7, Opus 4.6, and Opus 4.5. Claude Opus 5 has a separate rate limit and is not pa
*2 Opus rate limit is a total limit that applies to combined traffic across Claude Opus 4.8, Opus 4.7, Opus 4.6, and Opus 4.5. Claude Opus 5.5 and Claude Opus 5 each have a separat
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api/errors
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api/errors
On Claude Fable 5.1, [Claude Mythos 5.1](https://anthropic.com/glasswing), Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), and [Claude Mythos Preview](https://a
On Claude Fable 5.1, [Claude Mythos 5.1](https://anthropic.com/glasswing), Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Opus 5.5, and [Claude Mythos P
Claude Fable 5.1 and [Claude Mythos 5.1](https://anthropic.com/glasswing) don't support forced tool use. Sending `tool_choice: {"type": "any"}` or `tool_choice: {"type": "tool", "n
Claude Opus 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://anthropic.com/glasswing) don't support forced tool use. Sending `tool_choice: {"type": "any"}` or `tool_choice: {
### Computer use tool version not supported
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api/beta-headers
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api/beta-headers
"model": "claude-opus-5",
"model": "claude-opus-5-5",
--model claude-opus-5 \
--model claude-opus-5-5 \
model="claude-opus-5",
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agents-and-tools/tool-use/web-search-tool
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agents-and-tools/tool-use/web-search-tool
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
model="claude-opus-5",
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agents-and-tools/tool-use/tool-search-tool
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agents-and-tools/tool-use/tool-search-tool
| Claude Opus 5.5 (claude-opus-5-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
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agents-and-tools/tool-use/tool-runner
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agents-and-tools/tool-use/tool-runner
model="claude-opus-5",
model="claude-opus-5-5",
model: "claude-opus-5",
model: "claude-opus-5-5",
model: "claude-opus-5",
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agents-and-tools/tool-use/text-editor-tool
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agents-and-tools/tool-use/text-editor-tool
"model": "claude-opus-5",
"model": "claude-opus-5-5",
--model claude-opus-5 \
--model claude-opus-5-5 \
model="claude-opus-5",
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agents-and-tools/tool-use/strict-tool-use
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agents-and-tools/tool-use/strict-tool-use
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
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agents-and-tools/tool-use/server-tools
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agents-and-tools/tool-use/server-tools
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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agents-and-tools/tool-use/programmatic-tool-calling
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agents-and-tools/tool-use/programmatic-tool-calling
- claude-opus-5-5
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
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agents-and-tools/tool-use/parallel-tool-use
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agents-and-tools/tool-use/parallel-tool-use
model="claude-opus-5", max_tokens=1024, messages=messages, tools=tools
model="claude-opus-5-5", max_tokens=1024, messages=messages, tools=tools
model="claude-opus-5", max_tokens=1024, messages=messages, tools=tools
model="claude-opus-5-5", max_tokens=1024, messages=messages, tools=tools
model: "claude-opus-5",
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agents-and-tools/tool-use/overview
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agents-and-tools/tool-use/overview
"model": "claude-opus-5",
"model": "claude-opus-5-5",
--model claude-opus-5 \
--model claude-opus-5-5 \
model="claude-opus-5",
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agents-and-tools/tool-use/memory-tool
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agents-and-tools/tool-use/memory-tool
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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agents-and-tools/tool-use/handle-tool-calls
"model": "claude-opus-5",
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agents-and-tools/tool-use/fine-grained-tool-streaming
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agents-and-tools/tool-use/fine-grained-tool-streaming
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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model="claude-opus-5",
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agents-and-tools/tool-use/define-tools
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agents-and-tools/tool-use/define-tools
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
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agents-and-tools/tool-use/computer-use-tool
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agents-and-tools/tool-use/computer-use-tool
- claude-opus-5-5
- On the Claude API and Google Cloud, Claude Opus 5.5 supports computer use only through the `computer_toolset_20260801` toolset and returns an error for the earlier `computer_
- On Amazon Bedrock, Claude Opus 5.5 accepts the earlier `computer_20251124` tool version as Claude Opus 5 does.
"model": "claude-opus-5",
"model": "claude-opus-5-5",
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agents-and-tools/tool-use/code-execution-tool
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agents-and-tools/tool-use/code-execution-tool
- claude-opus-5-5
"model": "claude-opus-5",
"model": "claude-opus-5-5",
--model claude-opus-5 \
--model claude-opus-5-5 \
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agents-and-tools/tool-use/build-a-tool-using-agent
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agents-and-tools/tool-use/build-a-tool-using-agent
model: "claude-opus-5",
model: "claude-opus-5-5",
model: "claude-opus-5",
model: "claude-opus-5-5",
model: claude-opus-5
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agents-and-tools/tool-use/browser-use-tool
- claude-opus-5-5
"model": "claude-opus-5",
"model": "claude-opus-5-5",
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agents-and-tools/tool-use/bash-tool
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agents-and-tools/tool-use/bash-tool
"model": "claude-opus-5",
"model": "claude-opus-5-5",
--model claude-opus-5 \
--model claude-opus-5-5 \
model="claude-opus-5",
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agents-and-tools/mcp-tunnels/overview
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agents-and-tools/mcp-tunnels/overview
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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agents-and-tools/mcp-connector
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agents-and-tools/mcp-connector
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
model: claude-opus-5-5
model="claude-opus-5",
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agents-and-tools/agent-skills/quickstart
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agents-and-tools/agent-skills/quickstart
"model": "claude-opus-5",
"model": "claude-opus-5-5",
model: claude-opus-5
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agents-and-tools/agent-skills/claude-api-skill
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agents-and-tools/agent-skills/claude-api-skill
* **Model migration:** Step-by-step guidance for migrating to newer Claude models (including the breaking changes and behavior shifts on [Claude Opus 5](https://platform.claude.com
* **Model migration:** Step-by-step guidance for migrating to newer Claude models (including the breaking changes and behavior shifts on [Claude Opus 5.5](https://platform.claude.c
/claude-api migrate this project to claude-opus-5
/claude-api migrate this project to claude-opus-5-5
/claude-api migrate everything under src/ to claude-opus-5
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about-claude/use-case-guides/legal-summarization
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about-claude/use-case-guides/legal-summarization
text, details_to_extract, model="claude-opus-5", max_tokens=1000
text, details_to_extract, model="claude-opus-5-5", max_tokens=1000
text, details_to_extract, model="claude-opus-5", max_tokens=1000
text, details_to_extract, model="claude-opus-5-5", max_tokens=1000
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about-claude/use-case-guides/customer-support-chat
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about-claude/use-case-guides/customer-support-chat
MODEL = "claude-opus-5"
MODEL = "claude-opus-5-5"
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about-claude/pricing
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about-claude/pricing
| Claude Opus 5.5 | $4 / MTok | $5 / MTok | $8 /
*<sup>1 Cache hits and refreshes on Claude Fable 5.1 and Claude Mythos 5.1 are priced at 0.025x the base input price. All other models use the standard 0.1x multiplier.</sup>*
*<sup>1 Cache hits and refreshes on Claude Fable 5.1 and Claude Mythos 5.1 are priced at 0.025x the base input price.</sup>*
*<sup>2 Cache hits and refreshes on Claude Opus 5.5 are priced at 0.05x the base input price.</sup>*
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about-claude/models/optimizing-for-cost-and-intelligence
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about-claude/models/optimizing-for-cost-and-intelligence
Anthropic measured the triage job from [Trim input and context tokens](https://platform.claude.com/docs/en/about-claude/models/optimizing-for-cost-and-intelligence#trim-input-and-c
Anthropic measured the triage job from [Trim input and context tokens](https://platform.claude.com/docs/en/about-claude/models/optimizing-for-cost-and-intelligence#trim-input-and-c
These levers set where a single model sits between cost and intelligence: model choice, effort, re-running failures at a higher setting, and the budgets and caps it works within. S
These levers set where a single model sits between cost and intelligence: model choice, effort, re-running failures at a higher setting, and the budgets and caps it works within. S
Effort is the most direct way to tune a model to your task. The `effort` parameter governs how much thinking, tool calling, and self-verification the model does, and the default (`
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about-claude/models/choosing-a-model
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about-claude/models/choosing-a-model
* **Speed:** How quickly does the model need to respond in your application? Claude Opus 5 and Claude Opus 4.8 support [fast mode](https://platform.claude.com/docs/en/build-with-cl
* **Speed:** How quickly does the model need to respond in your application? Claude Opus 5.5, Claude Opus 5, and Claude Opus 4.8 support [fast mode](https://platform.claude.com/doc
* **Effort:** Several Claude models support an [effort parameter](https://platform.claude.com/docs/en/build-with-claude/effort) that trades intelligence for latency and cost within
* **Effort:** Several Claude models support an [effort parameter](https://platform.claude.com/docs/en/build-with-claude/effort) that trades intelligence for latency and cost within
1. Implement with Claude Opus 5.
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about-claude/model-deprecations
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about-claude/model-deprecations
| claude-opus-5-5 | Active | N/A | Not sooner than September 22, 2027 |
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api
release-notes/overview
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release-notes/overview
* With the `thinking-binding-controls-2026-08-01` beta header, the `input_transformations` response field gains a second entry type, `thinking_mismatch_allowed`. It names a thinkin
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models/fable-5-1/migration-guide
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models/fable-5-1/migration-guide
The API enforces the check for new accounts created on or after August 31, 2026. For accounts created earlier, the API records the mismatch but doesn't act on it unless the requ
The API enforces the check for new accounts created on or after August 31, 2026. For accounts created earlier, the API records the mismatch but doesn't act on it unless the requ
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managed-agents/quickstart
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managed-agents/quickstart
`ant apply` prints the environment's ID and records it in `claude-lock.json`. You'll reference it in every session you create.
<Tip>
[`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/apply) accepts more than one file, so you can create the agent and the environment with one comma
</Tip>
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build-with-claude/thinking-steering-and-cost
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build-with-claude/thinking-steering-and-cost
| Effort level | Thinking behavior |
| ---------------- | ------------------------------------------------------------------------------------ |
| `max` | Claude always thinks with no constraints on thinking depth. |
| `xhigh` | Claude always thinks deeply with extended exploration. |
| `high` (default) | Claude almost always thinks. Provides deep reasoning on complex tasks. |
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build-with-claude/thinking
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build-with-claude/thinking
* [The `thinking-binding-controls-2026-08-01` beta header](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking#preserved-thinking-controls). It adds an `input_
* [The `thinking-binding-controls-2026-08-01` beta header](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking#preserved-thinking-controls). It adds a `block_b
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build-with-claude/preserved-thinking
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build-with-claude/preserved-thinking
On an older account, none of these produces an error unless the request sets `prefix_mismatch_behavior`, so a run with no errors on your own key doesn't show whether your code is a
On an older account, none of these produces an error unless the request sets `prefix_mismatch_behavior`, so a run with no errors on your own key doesn't show whether your code is a
`"drop_block"` keeps requests succeeding but doesn't fix the edit. Count the responses in each session whose `input_transformations` has a `prefix_binding_mismatch` entry, and aler
`"drop_block"` keeps requests succeeding but doesn't fix the edit. Count the responses in each session whose `input_transformations` has a `prefix_binding_mismatch` entry, and aler
Under the beta header, every response from a thinking-capable model carries `input_transformations`. It's empty when nothing was dropped. Each entry has `type: "thinking_dropped"`,
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build-with-claude/effort
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build-with-claude/effort
At higher effort levels, Claude thinks on most requests and at greater length. At lower levels, it can skip thinking entirely for simpler problems. See [Thinking and effort](https:
At higher effort levels, Claude thinks more readily and at greater length. In a tool-use loop, follow-up requests that only process tool results can still skip thinking at any leve
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about-claude/models/optimizing-for-cost-and-intelligence
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about-claude/models/optimizing-for-cost-and-intelligence
| You can check outputs (tests, a verifier) | Run everything at low effort and re-run failures at the default (`high`); on the coding benchmark measured, the pass rate held
| You can check outputs (tests, a verifier) | Run everything at low effort and re-run failures at `high`; on the coding benchmark measured, the pass rate held at about half
Anthropic prices the Opus line identically per token across versions, so any difference comes from how much work each model does per task: priced as a customer is billed, Claude Op
Anthropic prices Claude Opus 4.7, Opus 4.8, and Opus 5 identically per token, so any difference among them comes from how much work each model does per task: priced as a customer i
CACHE_READ_PER_MTOK=0.50 # 0.1x the input price; 0.025x on Claude Fable 5.1 and Claude Mythos 5.1
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managed-agents/webhooks
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managed-agents/webhooks
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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managed-agents/vaults
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managed-agents/vaults
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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managed-agents/tools
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managed-agents/tools
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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managed-agents/skills
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featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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managed-agents/sessions
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managed-agents/sessions
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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api
managed-agents/session-operations
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apichanged
managed-agents/session-operations
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/self-hosted-sandboxes-security
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apichanged
managed-agents/self-hosted-sandboxes-security
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/self-hosted-sandboxes
±changed
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apichanged
managed-agents/self-hosted-sandboxes
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/scheduled-deployments
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apichanged
managed-agents/scheduled-deployments
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/reference
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managed-agents/reference
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/quickstart
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managed-agents/quickstart
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/permission-policies
±changed
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apichanged
managed-agents/permission-policies
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/overview
±changed
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apichanged
managed-agents/overview
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/onboarding
±changed
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apichanged
managed-agents/onboarding
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/multiagent-orchestration
±changed
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apichanged
managed-agents/multiagent-orchestration
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/migration
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managed-agents/migration
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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api
managed-agents/memory
±changed
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managed-agents/memory
featureMetadata:
status: beta
betaHeader: agent-memory-2026-07-22
## Compatibility
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api
managed-agents/mcp-connector
±changed
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managed-agents/mcp-connector
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/github
±changed
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managed-agents/github
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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api
managed-agents/files
±changed
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managed-agents/files
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/events-and-streaming
±changed
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apichanged
managed-agents/events-and-streaming
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/environments
±changed
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managed-agents/environments
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/define-outcomes
±changed
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managed-agents/define-outcomes
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/cloud-sandboxes-reference
±changed
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apichanged
managed-agents/cloud-sandboxes-reference
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
+6 −4 lines
Recorded here 22 Sep 2026 00:37 UTC
api
managed-agents/budgets
±changed
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managed-agents/budgets
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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api
managed-agents/agent-setup
±changed
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managed-agents/agent-setup
featureMetadata:
topic:
title: Managed Agents
url: https://platform.claude.com/docs/en/managed-agents/overview
status: beta
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Recorded here 22 Sep 2026 00:37 UTC
api
manage-claude/inference-hooks
±changed
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manage-claude/inference-hooks
The Inference hooks system doesn't keep its own copy of prompt or response content. It stores only your hook configuration and metadata about hook activity, such as verdicts, times
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api
manage-claude/compliance-sessions
±changed
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manage-claude/compliance-sessions
* `synthetic_marker` marks records generated by the endpoint itself, such as the marker that stands in for the system prompt. When the client rewrites or compacts its conversation
* `synthetic_marker` marks records generated by the endpoint itself, such as the marker that stands in for the system prompt. When the client rewrites or compacts its conversation
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api
manage-claude/compliance-faq
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manage-claude/compliance-faq
<Accordion title="Do Cowork, Claude Code, Claude Science, and Claude for Microsoft 365 sessions appear in the Compliance API?">
<Accordion title="Do Cowork, Claude Code, Claude Science, Claude for Microsoft 365, and Claude in Chrome sessions appear in the Compliance API?">
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api
build-with-claude/token-counting
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apichanged
build-with-claude/token-counting
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
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api
build-with-claude/task-budgets
±changed
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build-with-claude/task-budgets
featureMetadata:
status: beta
betaHeader: task-budgets-2026-03-13
supportedModels:
- claude-fable-5-1
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api
build-with-claude/structured-outputs
±changed
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apichanged
build-with-claude/structured-outputs
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
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api
build-with-claude/pdf-support
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apichanged
build-with-claude/pdf-support
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
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api
build-with-claude/overview
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build-with-claude/overview
| [Compaction](https://platform.claude.com/docs/en/build-with-claude/compaction) | Server-side context summarization for long-running conversati
| [Compaction at a token threshold](https://platform.claude.com/docs/en/build-with-claude/compaction-threshold) | Server-side context summarization for long-running conversati
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api
build-with-claude/files
±changed
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build-with-claude/files
featureMetadata:
status: ga
zdr: not-eligible
supportedPlatforms:
Claude API: ga
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Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/effort
±changed
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apichanged
build-with-claude/effort
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
+24 −5 lines
Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/compaction-threshold
±changed
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build-with-claude/compaction-threshold
featureMetadata:
status: beta
betaHeader: compact-2026-01-12
zdr:
eligibility: eligible
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Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/compaction-thinking-blocks
±changed
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build-with-claude/compaction-thinking-blocks
featureMetadata:
status: beta
betaHeader: compact-2026-09-04
supportedModels:
- claude-fable-5-1
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Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/compaction-on-demand
±changed
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build-with-claude/compaction-on-demand
featureMetadata:
status: beta
betaHeader: compact-2026-09-04
supportedModels:
- claude-fable-5-1
+23 −6 lines
Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/compaction-keep-recent-turns
±changed
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build-with-claude/compaction-keep-recent-turns
featureMetadata:
status: beta
betaHeader: compact-2026-09-04
supportedModels:
- claude-fable-5-1
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Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/compaction-background
±changed
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build-with-claude/compaction-background
featureMetadata:
status: beta
betaHeader: compact-2026-09-04
supportedModels:
- claude-fable-5-1
+21 −6 lines
Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/citations
±changed
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apichanged
build-with-claude/citations
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
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Recorded here 22 Sep 2026 00:37 UTC
api
build-with-claude/cache-diagnostics
±changed
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build-with-claude/cache-diagnostics
featureMetadata:
status: beta
betaHeader: cache-diagnosis-2026-04-07
zdr:
eligibility: eligible
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Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/tool-use/tool-runner
±changed
+1−1
apichanged
agents-and-tools/tool-use/tool-runner
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
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Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/tool-use/programmatic-tool-calling
±changed
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apichanged
agents-and-tools/tool-use/programmatic-tool-calling
featureMetadata:
status: ga
zdr: not-eligible
supportedModels:
- claude-fable-5-1
+27 −8 lines
Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/tool-use/computer-use-tool
±changed
+22−7
apichanged
agents-and-tools/tool-use/computer-use-tool
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
+22 −7 lines
Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/tool-use/code-execution-tool
±changed
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apichanged
agents-and-tools/tool-use/code-execution-tool
featureMetadata:
status: ga
zdr: not-eligible
supportedModels:
- claude-fable-5-1
+28 −8 lines
Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/tool-use/browser-use-tool
±changed
+19−5
apichanged
agents-and-tools/tool-use/browser-use-tool
featureMetadata:
status: ga
zdr:
eligibility: eligible
note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements).
+19 −5 lines
Recorded here 22 Sep 2026 00:37 UTC
api
agents-and-tools/mcp-connector
±changed
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agents-and-tools/mcp-connector
featureMetadata:
status: beta
betaHeader: mcp-client-2025-11-20
zdr: not-eligible
supportedPlatforms:
+10 −6 lines
Recorded here 22 Sep 2026 00:37 UTC
21 Sep 2026
239 pages
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api
release-notes/overview
±changed
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apichanged
release-notes/overview
* The Messages API can now [compact a conversation on demand](https://platform.claude.com/docs/en/build-with-claude/compaction#compact-on-demand-with-the-compaction-parameter) on t
* The Messages API can now [compact a conversation on demand](https://platform.claude.com/docs/en/build-with-claude/compaction-on-demand) on the Claude API, in beta with the `compa
* We've launched the [compaction API](https://platform.claude.com/docs/en/build-with-claude/compaction) in beta, providing server-side context summarization for effectively infinit
* We've launched the [compaction API](https://platform.claude.com/docs/en/build-with-claude/compaction-threshold) in beta, providing server-side context summarization for effective
+2 −2 lines
Recorded here 21 Sep 2026 19:37 UTC
api
models/fable-5-1/migration-guide
±changed
+3−3
apichanged
models/fable-5-1/migration-guide
1. Capture the exact request bodies it sends over a few normal turns, including a compaction or a tool change if your product has them. For each pair of consecutive requests, co
1. Capture the exact request bodies it sends over a few normal turns, including a compaction or a tool change if your product has them. For each pair of consecutive requests, co
5. **Trim context on the server, or compact in a shape that carries no stale thinking:** If your code truncates or summarizes older turns on the client, the simplest fix is to move
5. **Trim context on the server, or compact in a shape that carries no stale thinking:** If your code truncates or summarizes older turns on the client, the simplest fix is to move
Don't snip individual turns out of the middle of the transcript: that invalidates every later thinking block and no client-side shape avoids it. Use a [mid-conversation system m
+3 −3 lines
Recorded here 21 Sep 2026 19:37 UTC
api
managed-agents/tools
±changed
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apichanged
managed-agents/tools
<CodeGroup>
<CodeGroup defaultLanguage="CLI">
```bash CLI
ant beta:agents create <<'YAML'
name: Coding Assistant
+53 −33 lines
Recorded here 21 Sep 2026 19:37 UTC
api
managed-agents/scheduled-deployments
±changed
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apichanged
managed-agents/scheduled-deployments
* Deployments also require at least one initial event, a `user.message` or `user.define_outcome`, that starts each session's work.
* Deployments also require at least one initial event, a `user.message` or `user.define_outcome`, that starts each session's work. In a deployment file for `ant apply`, the text be
<CodeGroup>
<CodeGroup defaultLanguage="CLI">
```bash CLI
+27 −18 lines
Recorded here 21 Sep 2026 19:37 UTC
api
managed-agents/permission-policies
±changed
+24−16
apichanged
managed-agents/permission-policies
<CodeGroup>
<CodeGroup defaultLanguage="CLI">
```bash CLI
ant beta:agents create <<'YAML'
name: Coding Assistant
+24 −16 lines
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api
managed-agents/memory
±changed
+13−6
apichanged
managed-agents/memory
<CodeGroup>
<CodeGroup defaultLanguage="CLI">
```bash CLI
ant beta:memory-stores create \
--name "User Preferences" \
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Recorded here 21 Sep 2026 19:37 UTC
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