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
82 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
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12 Oct 2026
460 pages
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api
api/beta/organization/analytics/user_usage_report
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api/beta/organization/analytics/user_usage_report
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/user_cost_report/list
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api/beta/organization/analytics/user_cost_report/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/user_cost_report
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api/beta/organization/analytics/user_cost_report
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/usage_report/list
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api/beta/organization/analytics/usage_report/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/usage_report
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api/beta/organization/analytics/usage_report
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/summaries/list
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api/beta/organization/analytics/summaries/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/summaries
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api/beta/organization/analytics/summaries
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/organization/analytics/skills/list
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api/beta/organization/analytics/skills/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/skills
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api/beta/organization/analytics/skills
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/organization/analytics/plugins/list
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api/beta/organization/analytics/plugins/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/plugins
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api/beta/organization/analytics/plugins
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/cost_report/list
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api/beta/organization/analytics/cost_report/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/organization/analytics/cost_report
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api/beta/organization/analytics/cost_report
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/organization/analytics/connectors/list
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api/beta/organization/analytics/connectors/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/connectors
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api/beta/organization/analytics/connectors
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/artifacts/list
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api/beta/organization/analytics/artifacts/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/artifacts
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api/beta/organization/analytics/artifacts
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/organization/analytics/apps/chat/projects/list
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api/beta/organization/analytics/apps/chat/projects/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/apps/chat/projects
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api/beta/organization/analytics/apps/chat/projects
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/apps/chat
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api/beta/organization/analytics/apps/chat
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics/apps
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api/beta/organization/analytics/apps
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api/beta/organization/analytics
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api/beta/organization/analytics
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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api
api/beta/organization
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api/beta/organization
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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api
api/beta/models/retrieve
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api/beta/models/retrieve
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/models/list
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api/beta/models/list
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/models
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api/beta/models
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/messages/create
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api/beta/messages/create
Learn more about the Messages API in our [user guide](https://platform.claude.com/docs/en/get-started)
Learn more about the Messages API in our [user guide](https://platform.claude.com/docs/en/get-started?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Set to `0` to populate the [prompt cache](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#pre-warming-the-cache) without generating a response.
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api
api/beta/messages/count_tokens
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api/beta/messages/count_tokens
Learn more about token counting in our [user guide](https://platform.claude.com/docs/en/build-with-claude/token-counting)
Learn more about token counting in our [user guide](https://platform.claude.com/docs/en/build-with-claude/token-counting?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
If the final message uses the `assistant` role, the response content will continue immediately from the content in that message. This can be used to constrain part of the model's
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api
api/beta/messages/batches/retrieve
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api/beta/messages/batches/retrieve
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/messages/batches/results
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api/beta/messages/batches/results
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) for details.
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api
api/beta/messages/batches/list
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api/beta/messages/batches/list
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/messages/batches/delete
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api/beta/messages/batches/delete
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/messages/batches/create
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api/beta/messages/batches/create
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
See the [Messages API reference](https://platform.claude.com/docs/en/api/messages) for full documentation on available parameters.
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api
api/beta/messages/batches/cancel
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api/beta/messages/batches/cancel
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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api
api/beta/messages/batches
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api/beta/messages/batches
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing)
Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
See the [Messages API reference](https://platform.claude.com/docs/en/api/messages) for full documentation on available parameters.
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api
api/beta/messages
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api/beta/messages
Learn more about the Messages API in our [user guide](https://platform.claude.com/docs/en/get-started)
Learn more about the Messages API in our [user guide](https://platform.claude.com/docs/en/get-started?sdk_languages=http)
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Set to `0` to populate the [prompt cache](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#pre-warming-the-cache) without generating a response.
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api
api/beta/memory_stores/memory_versions/retrieve
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api/beta/memory_stores/memory_versions/retrieve
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](/docs/en/api/beta/memor
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](https://platform.claude
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
ID of the session (a `sesn_...` value). Look up the session via [Retrieve a session](/docs/en/api/beta/sessions/retrieve) for further provenance.
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api
api/beta/memory_stores/memory_versions/redact
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api/beta/memory_stores/memory_versions/redact
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](/docs/en/api/beta/memor
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](https://platform.claude
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
ID of the session (a `sesn_...` value). Look up the session via [Retrieve a session](/docs/en/api/beta/sessions/retrieve) for further provenance.
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api
api/beta/memory_stores/memory_versions/list
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api/beta/memory_stores/memory_versions/list
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](/docs/en/api/beta/memor
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](https://platform.claude
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
ID of the session (a `sesn_...` value). Look up the session via [Retrieve a session](/docs/en/api/beta/sessions/retrieve) for further provenance.
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api
api/beta/memory_stores/memory_versions
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api/beta/memory_stores/memory_versions
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](/docs/en/api/beta/memor
ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](https://platform.claude
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
Who performed this write: one of `session_actor`, `api_actor`, `user_actor`, or `service_account_actor`; `null` when no writer is recorded. Captured at write time and preserved
ID of the session (a `sesn_...` value). Look up the session via [Retrieve a session](/docs/en/api/beta/sessions/retrieve) for further provenance.
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api
api/beta/memory_stores/memories/update
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api/beta/memory_stores/memories/update
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
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api
api/beta/memory_stores/memories/retrieve
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api/beta/memory_stores/memories/retrieve
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
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ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memor
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memor
A rolled-up directory marker returned by [List memories](/docs/en/api/beta/memory_stores/memories/list) when `depth` is set. Indicates that one or more memories exist deeper th
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Tombstone returned by [Delete a memory](/docs/en/api/beta/memory_stores/memories/delete). Deleting a memory does not erase its version history: its versions remain listable via [
Tombstone returned by [Delete a memory](https://platform.claude.com/docs/en/api/beta/memory_stores/memories/delete?sdk_languages=http). Deleting a memory does not erase its versi
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ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
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ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an
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ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an `
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
When this memory was last modified, in RFC 3339 format. Use this as a cheap freshness signal; for who made the change, look up the head version's `created_by` via [List memory
ID of the `memory_version` representing this memory's current content (a `memver_...` value). This is the authoritative head pointer; `memory_version` objects do not carry an
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#track-progress) for how to poll a dream and what each status means.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#track-progress) for how to poll a dream and what each status means.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#how-it-works) for what a dream reads and produces.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#how-it-works) for what a dream reads and produces.
The [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#errors) lists common error codes and when they occur.
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#list-dreams) for how to page through dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#list-dreams) for how to page through dreams.
The [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#errors) lists common error codes and when they occur.
The [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#errors) lists common error codes and when they occur.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#limits) lists all the limits on a dream.
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#create-a-dream) to learn more about creating dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#create-a-dream) to learn more about creating dreams.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#limits) lists all the limits on a dream.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#limits) lists all the limits on a dream.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#limits) lists the supported models.
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#cancel-a-dream) to learn more about canceling dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#cancel-a-dream) to learn more about canceling dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#how-it-works) for what a dream reads and produces.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#how-it-works) for what a dream reads and produces.
The [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#errors) lists common error codes and when they occur.
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#archive-a-dream) to learn more about archiving dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#archive-a-dream) to learn more about archiving dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#how-it-works) for what a dream reads and produces.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#how-it-works) for what a dream reads and produces.
The [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#errors) lists common error codes and when they occur.
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See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#create-a-dream) to learn more about creating dreams.
See the [Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#create-a-dream) to learn more about creating dreams.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#limits) lists all the limits on a dream.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams?sdk_languages=http#limits) lists all the limits on a dream.
The [limits table in the Dreams guide](https://platform.claude.com/docs/en/managed-agents/dreams#limits) lists the supported models.
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MCP servers. Full replacement. Omit to preserve; send empty array or `null` to clear. Names must be unique. Maximum 20. Every server must be referenced by an `mcp_toolset` in the
MCP servers. Full replacement. Omit to preserve; send empty array or `null` to clear. Names must be unique. Maximum 20. Every server must be referenced by an `mcp_toolset` in the
Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison), e.g. `claude-opus-5`, or a `model_config`
Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview?sdk_languages=http#latest-models-comparison), e.g. `claude-opus-5`,
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Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison), e.g. `claude-opus-5`, or a `model_config`
Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview?sdk_languages=http#latest-models-comparison), e.g. `claude-opus-5`,
MCP servers this agent connects to. Maximum 20. Names must be unique within the array. Every server must be referenced by an `mcp_toolset` in `tools`; unreferenced servers are re
MCP servers this agent connects to. Maximum 20. Names must be unique within the array. Every server must be referenced by an `mcp_toolset` in `tools`; unreferenced servers are re
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Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison), e.g. `claude-opus-5`, or a `model_config`
Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview?sdk_languages=http#latest-models-comparison), e.g. `claude-opus-5`,
MCP servers this agent connects to. Maximum 20. Names must be unique within the array. Every server must be referenced by an `mcp_toolset` in `tools`; unreferenced servers are re
MCP servers this agent connects to. Maximum 20. Names must be unique within the array. Every server must be referenced by an `mcp_toolset` in `tools`; unreferenced servers are re
MCP servers. Full replacement. Omit to preserve; send empty array or `null` to clear. Names must be unique. Maximum 20. Every server must be referenced by an `mcp_toolset` in the
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Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
Learn more about the Messages API in our [user guide](https://platform.claude.com/docs/en/get-started)
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A **workflow** is a program that an agent writes to run many agents and combine what they return. A **workflow run** is the execution of one workflow. **[Dynamic workflows](https:/
A **workflow** is a program that an agent writes to run many agents and combine what they return. A **workflow run** is the execution of one workflow. **[Dynamic workflows](https:/
* **Agent threads:** In a phase, the program runs agents. Each agent works in its own [session thread](https://platform.claude.com/docs/en/managed-agents/session-threads), on a pro
* **Agent threads:** In a phase, the program runs agents. Each agent works in its own [session thread](https://platform.claude.com/docs/en/managed-agents/session-threads), on a pro
A run is **open** from its `workflow_run.created` event until its `workflow_run.status_ended` event, whether it's running or idle. A run is idle while it's paused, for example at t
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| Event | Trigger
| -------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------
| `deployment_run.started` | A scheduled run started. Only scheduled runs emit `deployment_run` events; [manual runs](https://platform.claude.com/docs/en/managed-agents/sched
| `deployment_run.succeeded` | A scheduled run created its session. The event carries the same `data.id` (the run ID) as the run's `deployment_run.started` event. To follow the
| `deployment_run.failed` | A scheduled run did not create a session. The event carries the same `data.id` as the run's `deployment_run.started` event. Fetch the [deployment
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A vault is the collection of `credentials` associated with an end user. Give it a `display_name` and optionally tag it with `metadata` so you can map it back to your own user recor
A vault is the collection of `credentials` associated with an end user. Give it a `display_name` (java, php: `displayName`; csharp, go: `DisplayName`) and optionally tag it with `m
* **MCP credentials** (`mcp_oauth`, `static_bearer`): each credential is keyed by an `mcp_server_url`. When the agent connects to a server at that URL at session runtime, the token
* **Environment variables** (`environment_variable`): each credential is keyed by a `secret_name` (the environment variable name) and stored in the sandbox as an opaque placeholder
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api
managed-agents/tools-web-restrictions
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managed-agents/tools-web-restrictions
To control which sites the agent's web tools can reach, set a domain list on the `web_search` and `web_fetch` entries of the [agent toolset](https://platform.claude.com/docs/en/man
* **`allowed_domains`:** The tool can reach only these hosts.
* **`blocked_domains`:** The tool can never reach these hosts.
To control which sites the agent's web tools can reach, set a domain list on the `web_search` and `web_fetch` entries of the [agent toolset](https://platform.claude.com/docs/en/man
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api
managed-agents/tools
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managed-agents/tools
Enable the full toolset with `agent_toolset_20260401` when creating an agent. Use the `configs` array to disable specific tools or override their settings. Each entry is identified
Each config entry can also set a `permission_policy`. The policy controls whether the tool's calls run without confirmation, require confirmation, or are evaluated individually by
Enable the full toolset with `agent_toolset_20260401` when creating an agent. Use the `configs` (java, php; csharp, go: `Configs`) array to disable specific tools or override their
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api
managed-agents/skills
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managed-agents/skills
Skills reach your agent in two ways: attach them through the agent's `skills` array, or [load them from a GitHub repository](https://platform.claude.com/docs/en/managed-agents/skil
Skills reach your agent in two ways: attach them through the agent's `skills` (java, php; csharp, go: `Skills`) array, or [load them from a GitHub repository](https://platform.clau
These examples omit the optional `display_name` field, so the skill's display name is derived from the `name` field in `SKILL.md`. An explicit `display_name` can be up to 255 chara
These examples omit the optional `display_name` (java, php: `displayName`; csharp, go: `DisplayName`) field, so the skill's display name is derived from the `name` field in `SKILL.
Each entry in the `skills` array uses the following fields:
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api
managed-agents/sessions
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managed-agents/sessions
A session is an agent instance within an environment. Each session references an [agent](https://platform.claude.com/docs/en/managed-agents/agent-setup) and an [environment](https:
A session is an agent instance within an environment. Each session references an [agent](https://platform.claude.com/docs/en/managed-agents/agent-setup) and an [environment](https:
A session requires an `agent` ID and an `environment` ID. Agents are versioned resources; passing in the `agent` ID as a string creates the session with the latest agent version.
A session requires an `agent` ID and an `environment` ID. Agents are versioned resources; passing in the `agent` (java, php; csharp, go: `Agent`) ID as a string creates the session
You can create a session and start its work in one call. `initial_events` is an optional array of initial [events](https://platform.claude.com/docs/en/managed-agents/reference#even
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api
managed-agents/session-threads
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managed-agents/session-threads
The session `status` is an aggregation of all agent activity; if at least one thread is `running`, then the overall session status is `running` as well. A [workflow run](https://pl
The session `status` (java, php; csharp, go: `Status`) is an aggregation of all agent activity; if at least one thread is `running`, then the overall session status is `running` as
The full list includes the primary thread. `parent_thread_id` is `null` for the primary thread. Every other thread is a child thread. `workflow_run_id` is `null` except on [a run's
The full list includes the primary thread. `parent_thread_id` (java: `parentThreadId`; php: `parentThreadID`; csharp, go: `ParentThreadID`) is `null` for the primary thread. Every
Send `user.interrupt` with `session_thread_id` to stop a specific thread. Omitting `session_thread_id` interrupts every non-archived thread in the session, including the primary. I
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api
managed-agents/session-operations
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managed-agents/session-operations
| Status | Description
| -------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------
| `idle` | Agent is waiting for input, including user messages or tool confirmations. Sessions created without `initial_events` start in `idle`. A session can be `idle` whi
| `running` | Agent is actively executing.
| `rescheduling` | Transient error occurred, retrying automatically.
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api
managed-agents/session-observability
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managed-agents/session-observability
Use the session viewer in the Claude Console to inspect what an agent did in a session, without writing any code. Use the session's `usage` totals to see what that work consumed.
Use the session viewer in the Claude Console to inspect what an agent did in a session, without writing any code. Use the session's `usage` (java, php; csharp, go: `Usage`) totals
You don't have to poll the session to observe these totals. The `session.usage` event carries the same cumulative snapshot on the session stream and in the event history. The snaps
You don't have to poll the session to observe these totals. The `session.usage` event carries the same cumulative snapshot on the session stream and in the event history. The snaps
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api
managed-agents/self-hosted-sandboxes-workers
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managed-agents/self-hosted-sandboxes-workers
Each claimed work item can carry a per-session `secret`, which Anthropic issues. The worker that runs the session needs it to mount [memory stores](https://platform.claude.com/docs
Each claimed work item can carry a per-session `secret` (java, php; csharp, go: `Secret`), which Anthropic issues. The worker that runs the session needs it to mount [memory stores
| The SDK's `work.poller()` (go: `environments.NewWorkPoller()`) | The `secret` field of each claimed work item | `ANTHROPIC_WORK_SECRET` in the sandbox
| The SDK's `work.poller()` (go: `environments.NewWorkPoller()`) | The `secret` (go: `Secret`) field of each claimed work item | `ANTHROPIC_WORK_SECRET` in the sandbox
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api
managed-agents/self-hosted-sandboxes-security
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managed-agents/self-hosted-sandboxes-security
* **Per-session credentials.** Each work item your worker claims can carry a per-session `secret`, which the worker uses in place of the environment service key. Access to [memory
* **Per-session credentials.** Each work item your worker claims can carry a per-session `secret` (java, php; csharp, go: `Secret`), which the worker uses in place of the environme
* **Read-only memory stores.** A store attached with `read_only` access is protected from upload, not from local modification. The worker's `write` and `edit` tools refuse to write
* **Read-only memory stores.** A store attached with `read_only` access is protected from upload, not from local modification. The worker's `write` and `edit` tools refuse to write
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api
managed-agents/self-hosted-sandboxes-reference
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managed-agents/self-hosted-sandboxes-reference
| Path | Contents
| -------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------
| `/workspace` | The system default working directory for tool execution and skill download. If you use a different working directory, update your agent's system prom
| `<workdir>/skills/<name>/` | The agent's downloaded skills.
| `/mnt/memory/<store>/` | One directory per attached memory store, at the store's `mount_path` (for example, `/mnt/memory/user-preferences/`). The worker creates these directo
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api
managed-agents/self-hosted-sandboxes-operations
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managed-agents/self-hosted-sandboxes-operations
| Field | Meaning
| ------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------
| `depth` | Items waiting to be claimed.
| `pending` | Items claimed by a worker but not yet acknowledged. The worker helpers acknowledge each item before processing it, so this stays near zero in normal operatio
| `oldest_queued_at` | Timestamp of the oldest item still in the queue, either waiting to be claimed or claimed but not yet acknowledged. `null` when there is none.
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api
managed-agents/self-hosted-sandboxes-memory
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managed-agents/self-hosted-sandboxes-memory
Sessions on a self-hosted environment attach [memory stores](https://platform.claude.com/docs/en/managed-agents/memory) exactly as sessions on cloud environments do. List them in `
Sessions on a self-hosted environment attach [memory stores](https://platform.claude.com/docs/en/managed-agents/memory) exactly as sessions on cloud environments do. List them in `
Do not create the per-store directories yourself. The worker creates each store's `mount_path` directory (for example, `/mnt/memory/user-preferences`) when a session starts and rem
Do not create the per-store directories yourself. The worker creates each store's `mount_path` (java, php: `mountPath`; csharp, go: `MountPath`) directory (for example, `/mnt/memor
1. **Downloads each store to its `mount_path`.** This is the same directory under `/mnt/memory/` that cloud sessions use, and the session's system prompt describes it to the agent.
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api
managed-agents/scheduled-deployments
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managed-agents/scheduled-deployments
When creating a deployment, you pass the [session configurations](https://platform.claude.com/docs/en/managed-agents/sessions) required for execution, in addition to a `schedule`.
When creating a deployment, you pass the [session configurations](https://platform.claude.com/docs/en/managed-agents/sessions) required for execution, in addition to a `schedule` (
* In the `schedule`, you define a cron `expression` and a `timezone`. Maximum granularity supported is at the minute level.
* In the `schedule` (java, php; csharp, go: `Schedule`), you define a cron `expression` (java, php; csharp, go: `Expression`) and a `timezone` (java, php; csharp, go: `Timezone`).
Pass the optional `budget` object when you create or update the deployment. It takes the same shape as a [session budget](https://platform.claude.com/docs/en/managed-agents/budgets
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api
managed-agents/reference
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managed-agents/reference
| Type | Description
| -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------
| `agent.message` | Agent response content blocks.
| `agent.thinking` | Signals the agent is making forward progress through extended thinking. This is a progress signal only and does not carry the thinking cont
| `agent.tool_use` | Agent invokes a pre-built agent tool (bash, file operations, and so on). Carries `evaluated_permission` and, usually, `evaluation` (see [ho
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api
managed-agents/quickstart
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managed-agents/quickstart
An environment defines the sandbox where your agent runs. This one uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networking) with
An environment defines the sandbox where your agent runs. This one uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networking) with
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api
managed-agents/permission-policies
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managed-agents/permission-policies
You set permission policies in the agent's `tools` configuration when you create the agent, and you can change them later by [updating the agent](https://platform.claude.com/docs/e
You set permission policies in the agent's `tools` (java, php; csharp, go: `Tools`) configuration when you create the agent, and you can change them later by [updating the agent](h
When creating an agent, you can apply a policy to every tool in `agent_toolset_20260401` using `default_config.permission_policy`:
When creating an agent, you can apply a policy to every tool in `agent_toolset_20260401` using `default_config.permission_policy` (java, php: `defaultConfig.permissionPolicy`; csha
`default_config` is optional. If you omit it, the agent toolset is enabled with the default permission policy, `always_allow`.
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api
managed-agents/multiagent-orchestration
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managed-agents/multiagent-orchestration
* **Predefined agent:** An agent that you have already [created](https://platform.claude.com/docs/en/managed-agents/agent-setup), and that you list in the `multiagent` block. It us
* **Predefined agent:** An agent that you have already [created](https://platform.claude.com/docs/en/managed-agents/agent-setup), and that you list in the `multiagent` (java, php;
When [defining your agent](https://platform.claude.com/docs/en/managed-agents/agent-setup), set `subagents.predefined_agents` in the `multiagent` block to list the agents that it c
When [defining your agent](https://platform.claude.com/docs/en/managed-agents/agent-setup), set the `predefined_agents` (java, php: `predefinedAgents`; csharp, go: `PredefinedAgent
The agent can also delegate to inline agents unless you turn them off. For that setting, and for the forms that an entry of `subagents.predefined_agents` takes, see [Predefined and
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api
managed-agents/migration
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managed-agents/migration
* **Web search and web fetch settings:** Same `allowed_domains`, `blocked_domains`, `max_content_tokens`, and `user_location` fields, now set once on the `web_search` and `web_fetc
* **Web search and web fetch settings:** Same `allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`), `blocked_domains` (java, php: `blockedDomains`; csharp,
| `system_prompt` (python; typescript: `systemPrompt`) and the `CLAUDE.md` hierarchy | A single `system` string on the Agent. Each update that changes the
| `system_prompt` (python; typescript: `systemPrompt`) and the `CLAUDE.md` hierarchy | A single `system` (java, php; csharp, go: `System`; ruby: `system_`)
| `permission_mode` (python; typescript: `permissionMode`), `can_use_tool` (python; typescript: `canUseTool`) | Per-tool [`permission_policy`](https://platform.claude.com/docs/en/m
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