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
managed-agents/memory
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managed-agents/memory
Give the store a `name` and a `description`. The description is passed to the agent, telling it what the store contains.
Give the store a `name` (java, php; csharp, go: `Name`) and a `description` (java, php; csharp, go: `Description`). The description is passed to the agent, telling it what the stor
The memory store `id` (`memstore_...`) is what you pass when attaching the store to a session.
The memory store `id` (java, php; csharp, go: `ID`) (`memstore_...`) is what you pass when attaching the store to a session.
Memory stores are attached in the session's `resources[]` array when the [session is created](https://platform.claude.com/docs/en/managed-agents/sessions#creating-a-session). Unlik
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api
managed-agents/mcp-connector
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managed-agents/mcp-connector
Specify MCP servers in the `mcp_servers` array when creating an agent. Each server needs a `type`, a unique `name`, and a `url`. No authentication tokens are provided at this stage
Each declared server also needs a matching `mcp_toolset` entry in the `tools` array. The toolset's `mcp_server_name` must match the server's `name`.
Specify MCP servers in the `mcp_servers` (java, php: `mcpServers`; csharp: `McpServers`; go: `MCPServers`) array when creating an agent. Each server needs a `type` (java, php; csha
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api
managed-agents/github
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managed-agents/github
Then create a session that mounts the GitHub repository. With a `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking), session creatio
Then create a session that mounts the GitHub repository. With a `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking), session creatio
| Field | Description
| --------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------
| `type` | Required. Must be `"github_repository"`.
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api
managed-agents/files
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managed-agents/files
Mount uploaded files into the sandbox by adding them to the `resources` array when creating a session:
Mount uploaded files into the sandbox by adding them to the `resources` (java, php; csharp, go: `Resources`) array when creating a session:
The `mount_path` is optional, but make sure the uploaded file has a descriptive name so the agent can identify it.
The `mount_path` (java, php: `mountPath`; csharp, go: `MountPath`) is optional, but make sure the uploaded file has a descriptive name so the agent can identify it.
With the preceding `mount_path`, the agent reads the file at `/mnt/session/uploads/data.csv` (see [File paths](https://platform.claude.com/docs/en/managed-agents/files#file-paths))
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api
managed-agents/events-and-streaming
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managed-agents/events-and-streaming
Every event in the session's history includes a `processed_at` timestamp, set when the event finishes processing. On events you send, `processed_at` is null while the event is stil
Every event in the session's history includes a `processed_at` (java, php: `processedAt`; csharp, go: `ProcessedAt`) timestamp, set when the event finishes processing. On events yo
The `agent.custom_tool_use` event contains the tool name and input. Run the tool in your system. Then send a `user.custom_tool_result` event, passing the event ID in the `custom_to
The `agent.custom_tool_use` event contains the tool name and input. Run the tool in your system. Then send a `user.custom_tool_result` event, passing the event ID in the `custom_to
Send a `user.tool_confirmation` event, passing the event ID in the `tool_use_id` parameter. Set `result` to `"allow"` or `"deny"`. See [Respond to confirmation requests](https://pl
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api
managed-agents/event-deltas
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managed-agents/event-deltas
Each SDK's helper handles the `index` bookkeeping. The Go, Java, Ruby, and C# helpers also key the accumulating preview by the event's `id`. With the Python, TypeScript, and PHP he
Each SDK's helper handles the `index` (java, php; csharp, go: `Index`) bookkeeping. The Go, Java, Ruby, and C# helpers also key the accumulating preview by the event's `id` (java,
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api
managed-agents/environments
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managed-agents/environments
Use a unique, descriptive `name` so you can tell environments apart. This example uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networ
Use a unique, descriptive `name` (java, php; csharp, go: `Name`) so you can tell environments apart. This example uses `limited` [networking](https://platform.claude.com/docs/en/ma
The `packages` field pre-installs packages into the sandbox before the agent starts. Packages are installed by their respective package managers and cached across sessions that sha
The `packages` (java, php; csharp, go: `Packages`) field pre-installs packages into the sandbox before the agent starts. Packages are installed by their respective package managers
The `networking` field controls the sandbox's outbound network access.
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api
managed-agents/dreams
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managed-agents/dreams
The dream produces another **output memory store**, separate from the input. The output store ID appears in the dream's `outputs[]` shortly after the dream starts `running`, once t
The dream produces another **output memory store**, separate from the input. The output store ID appears in the dream's `outputs` (java, php; csharp, go: `Outputs`) array shortly a
Dreaming inputs include the pre-existing memory store and an array of sessions. The selected model runs the dreaming pipeline. During the research preview, `claude-opus-5-5`, `clau
Dreaming inputs include the pre-existing memory store and an array of sessions. The selected model runs the dreaming pipeline. During the research preview, `claude-opus-5-5`, `clau
The optional `instructions` field steers what the dreaming pipeline synthesizes. It is applied throughout the pipeline: what to read closely, what to merge or drop, and how to stru
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api
managed-agents/define-outcomes
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managed-agents/define-outcomes
You can also define the outcome in the create request itself: pass a single `user.define_outcome` event in [`initial_events`](https://platform.claude.com/docs/en/managed-agents/s
You can also define the outcome in the create request itself: pass a single `user.define_outcome` event in [`initial_events` (java, php: `initialEvents`; csharp, go: `InitialEven
* A `user.interrupt` event pauses work on the current outcome and marks the `span.outcome_evaluation_end.result` as `interrupted`, allowing you to kick off a new outcome.
* A `user.interrupt` event pauses work on the current outcome and marks the `result` (java, php; csharp, go: `Result`) of the `span.outcome_evaluation_end` event as `interrupted`,
This is the event you send to initiate an outcome. It is echoed back on receipt, including a `processed_at` timestamp and `outcome_id`.
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api
managed-agents/budgets
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managed-agents/budgets
Pass the optional `budget` field when you create the session:
Pass the optional `budget` (java, php; csharp, go: `Budget`) field when you create the session:
The `budget` object has two fields:
* `type` is always `"limit"`.
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api
managed-agents/agent-setup
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managed-agents/agent-setup
| Field | Description
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| `name` | Required. A human-readable name for the agent.
| `model` | Required. The Claude [model](https://platform.claude.com/docs/en/models/overview) that powers the agent. Accepts a model ID string or an object, for example `{"id
| `system` | A [system prompt](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/claude-prompting-best-practices#give-claude-a-role) that defines the ag
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11 Oct 2026
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api
managed-agents/sessions
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managed-agents/sessions
To cap what a session can spend, pass the optional `budget` object when you create it. A budget is a hard ceiling on the session's list cost: the platform prices everything the ses
The following example creates a session with a $25.00 budget; the response echoes the `budget` on the session resource:
```bash cURL
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managed-agents/scheduled-deployments
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managed-agents/scheduled-deployments
```bash cURL
curl --fail-with-body -sS "https://api.anthropic.com/v1/deployments/$DEPLOYMENT_ID?beta=true" \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "anthropic-beta: managed-agents-2026-04-01" \
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manage-claude/api-and-data-retention
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manage-claude/api-and-data-retention
| Feature | Endpoint | ZD
| -------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ | --
| [1M token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) | `/v1/messages` | <E
| [Adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | `/v1/messages` | <E
| [Advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) | `/v1/messages` (with `advisor` tool) | <E
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10 Oct 2026
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api
release-notes/overview
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release-notes/overview
* The Compliance API can now download Claude Docs documents as Word files, in beta. See [Retrieve files and artifacts](https://platform.claude.com/docs/en/manage-claude/compliance-
* We've launched **Claude Fable 5** (`claude-fable-5`), our most capable model open to all customers, alongside **Claude Mythos 5** (`claude-mythos-5`) for Project Glasswing partic
* We've launched **Claude Fable 5** (`claude-fable-5`), our most capable model open to all customers, alongside **Claude Mythos 5** (`claude-mythos-5`) for Project Glasswing partic
* On Claude Fable 5 and Claude Mythos 5, [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) is the only thinking mode: `thinking: {"type": "disable
* On Claude Fable 5 and Claude Mythos 5, [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) is the only thinking mode: `thinking: {"type": "disable
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models/sonnet-5/overview
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models/sonnet-5/overview
Although Claude Sonnet 5 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs/e
Although Claude Sonnet 5 is still available, you should consider migrating to Claude Sonnet 5.5. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overv
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models/sonnet-4-6/overview
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models/sonnet-4-6/overview
Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs
Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5.5. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/ove
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models/opus-5/overview
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models/opus-5/overview
Although Claude Opus 5 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/mode
Although Claude Opus 5 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) · [
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models/opus-4-8/overview
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models/opus-4-8/overview
Although Claude Opus 4.8 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/mo
Although Claude Opus 4.8 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) ·
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models/opus-4-7/overview
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models/opus-4-7/overview
Although Claude Opus 4.7 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/mo
Although Claude Opus 4.7 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) ·
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models/opus-4-6/overview
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models/opus-4-6/overview
Although Claude Opus 4.6 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/mo
Although Claude Opus 4.6 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) ·
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models/opus-4-5/overview
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models/opus-4-5/overview
Although Claude Opus 4.5 is still available, you should consider migrating to Claude Opus 5.5 for improved performance. [See Claude Opus 5.5](https://platform.claude.com/docs/en/mo
Although Claude Opus 4.5 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) ·
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models/mythos-5/overview
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models/mythos-5/overview
[Announcement](https://www.anthropic.com/news/claude-fable-5-mythos-5) · [What’s new](https://platform.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mytho
[Announcement](https://www.anthropic.com/news/claude-fable-5-mythos-5) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide#migrating-from-claud
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models/haiku-4-5/overview
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models/haiku-4-5/overview
Although Claude Haiku 4.5 is still available, you should consider migrating to Claude Haiku 5.5 for improved performance. [See Claude Haiku 5.5](https://platform.claude.com/docs/en
Although Claude Haiku 4.5 is still available, you should consider migrating to Claude Haiku 5.5. [See Claude Haiku 5.5](https://platform.claude.com/docs/en/models/haiku-5-5/overvie
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models/fable-5/overview
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models/fable-5/overview
Although Claude Fable 5 is still available, you should consider migrating to Claude Fable 5.1 for improved performance. [See Claude Fable 5.1](https://platform.claude.com/docs/en/m
Although Claude Fable 5 is still available, you should consider migrating to Claude Fable 5.1. [See Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview)
[Announcement](https://www.anthropic.com/news/claude-fable-5-mythos-5) · [What’s new](https://platform.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mytho
[Announcement](https://www.anthropic.com/news/claude-fable-5-mythos-5)
<Card title="Introducing Claude Fable 5 and Claude Mythos 5" icon="star" href="https://platform.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5">
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models/fable-5/migration-guide
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models/fable-5/introducing-claude-fable-5-and-claude-mythos-5
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models/fable-5-1/migration-guide
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models/fable-5-1/migration-guide
First apply [Migrating to Claude Mythos 5 and Claude Fable 5 from Claude Opus 4.8](https://platform.claude.com/docs/en/models/fable-5/migration-guide#migrating-from-claude-opus-48)
Work through the checklist below. On Claude Opus 4.7 or earlier, start with the matching [Claude Opus 5.5 migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migra
* Update response parsing that reads content by position, such as `content[0].text`: a response can now start with `thinking` blocks, so select content blocks by `type` instead.
* Re-evaluate `effort` (start at `high`), review prompts near the 512-token caching minimum, and re-baseline cost and latency. Per-token pricing differs.
* Re-evaluate `effort` (start at `high`), review prompts near the 512-token [caching minimum](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#cache-limitations
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managed-agents/session-threads
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managed-agents/session-threads
await foreach (var thread in (await client.Beta.Sessions.Threads.List(session.ID)).Paginate())
await foreach (var sessionThread in (await client.Beta.Sessions.Threads.List(session.ID)).Paginate())
var label = thread.Agent.TryPickBetaManagedAgentsSessionThread(out var agent)
? agent.Name
: thread.Agent.Json.GetProperty("type").GetString();
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manage-claude/compliance-content-data
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manage-claude/compliance-content-data
Files and artifacts are downloaded by ID, not listed independently. The IDs come from the chat messages endpoint in [Retrieve chats and messages](https://platform.claude.com/docs/e
Files and artifacts are downloaded by ID. Except for Claude Docs documents (see the end of this section), they aren't listed independently. The IDs come from the chat messages endp
Claude Docs documents are listed separately, by [List code artifacts](https://platform.claude.com/docs/en/api/compliance/code/artifacts/list), with `artifact_type` set to `claude_d
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5
If the `bio` classifier blocks your organization's life sciences work, you can apply to the [Life Sciences Verification Program](https://www.anthropic.com/news/life-sciences-verifi
If the `cyber` classifier blocks your organization's legitimate security work, you can apply to the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). I
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build-with-claude/prompt-engineering/prompting-claude-opus-5-5
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build-with-claude/prompt-engineering/prompting-claude-opus-5-5
* **Cybersecurity:** Finding vulnerabilities in source code is allowed. High-risk dual-use cybersecurity activities are not.
* **Cybersecurity:** Finding vulnerabilities in source code is allowed. High-risk dual-use cybersecurity activities are not. If the cybersecurity classifier gets in the way of your
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build-with-claude/prompt-engineering/prompting-claude-fable-5
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build-with-claude/prompt-engineering/prompting-claude-fable-5
This guide covers the prompting and scaffolding patterns specific to Claude Fable 5 and Claude Mythos 5. For the model's capabilities, API changes, pricing, and availability, see [
This guide covers the prompting and scaffolding patterns specific to Claude Fable 5 and Claude Mythos 5. For the model's specifications, pricing, and availability, see [Claude Fabl
For API parameter changes specific to Claude Fable 5 and Claude Mythos 5 (adaptive thinking only, summarized-only thinking output, no extended thinking budgets, the `refusal` sto
For how thinking works on Claude Fable 5 and Claude Mythos 5 (adaptive thinking only, summarized-only thinking output, no extended thinking budgets), see [Thinking](https://platf
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build-with-claude/prompt-engineering/claude-prompting-best-practices
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build-with-claude/prompt-engineering/claude-prompting-best-practices
For an overview of model capabilities, see the [models overview](https://platform.claude.com/docs/en/models/overview). For Claude Fable 5.1 capabilities and API changes, see [Wha
For an overview of model capabilities, see the [models overview](https://platform.claude.com/docs/en/models/overview). For Claude Fable 5.1 capabilities and API changes, see [Wha
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build-with-claude/claude-in-amazon-bedrock
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build-with-claude/claude-in-amazon-bedrock
Use Claude Code 2.1.255 or later with Claude Fable 5.1 on Amazon Bedrock, and 2.1.280 or later with Claude Opus 5.5 and Claude Haiku 5.5; run `claude update` to upgrade.
Use the latest version of Claude Code with Claude in Amazon Bedrock; run `claude update` to upgrade.
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managed-agents/workflow-runs
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managed-agents/workflow-runs
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managed-agents/session-threads
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managed-agents/multiagent-orchestration
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managed-agents/multiagent-orchestration
* **Budget:** Set a [session budget](https://platform.claude.com/docs/en/managed-agents/budgets) when you create the session to cap the session's spend, runs included; you can't ad
* **Budget:** Set a [session budget](https://platform.claude.com/docs/en/managed-agents/budgets) when you create the session to cap the session's spend, runs included; you can't ad
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managed-agents/events-and-streaming
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managed-agents/events-and-streaming
No event you send resumes a session paused at its budget. The paused work resumes automatically when you change the budget to a value above the consumed list cost, or remove it. Wh
No event you send resumes a session paused at its budget. The work that the budget paused resumes automatically when you change the budget to a value above the consumed list cost,
The `agent.custom_tool_use` event contains the tool name and input. Execute the tool in your system. Then send a `user.custom_tool_result` event, passing the event ID in the `custo
The `agent.custom_tool_use` event contains the tool name and input. Run the tool in your system. Then send a `user.custom_tool_result` event, passing the event ID in the `custom_to
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managed-agents/budgets
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managed-agents/budgets
A session budget is an optional hard spend ceiling you set when you [create a session](https://platform.claude.com/docs/en/managed-agents/sessions). The platform continuously price
A session budget is an optional hard spend ceiling you set when you [create a session](https://platform.claude.com/docs/en/managed-agents/sessions). The platform continuously price
* **Web searches**, at $10 per 1,000 searches
* **Session running time**, at $0.08 per hour
* **Web searches**, at $10 USD per 1,000 searches
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api
manage-claude/user-management
±changed
+3−0
apichanged
manage-claude/user-management
Read a role's name from its `display_name` field. The deprecated `name` field is still returned, always equal to `display_name`. For a role provisioned by Anthropic, `display_name`
"display_name": "Engineering base",
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Recorded here 9 Oct 2026 21:37 UTC
api
cli-sdks-libraries/sdks/typescript
±changed
+4−4
apichanged
cli-sdks-libraries/sdks/typescript
Avoid setting a large `max_tokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [ti
Avoid setting a large `max_tokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [ti
Beta features are available before general release to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools in the
You can access most beta API features through the beta property of the client. To enable a particular beta feature, you need to add the appropriate [beta header](https://platform.c
+4 −4 lines
Recorded here 9 Oct 2026 21:37 UTC
api
cli-sdks-libraries/sdks/python
±changed
+2−2
apichanged
cli-sdks-libraries/sdks/python
Avoid setting a large `max_tokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [ti
Avoid setting a large `max_tokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [ti
Beta features are available before general release to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools in the
Beta features are available before general release to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools in the
+2 −2 lines
Recorded here 9 Oct 2026 21:37 UTC
api
cli-sdks-libraries/sdks/java
±changed
+1−1
apichanged
cli-sdks-libraries/sdks/java
Beta features are available before general release to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools in the
Beta features are available before general release to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools in the
+1 −1 lines
Recorded here 9 Oct 2026 21:37 UTC
api
cli-sdks-libraries/sdks/go
±changed
+1−1
apichanged
cli-sdks-libraries/sdks/go
Avoid setting a large `MaxTokens` value without using streaming as some networks may drop idle connections after a certain period of time, which can cause the request to fail or [t
Avoid setting a large `MaxTokens` value without using streaming as some networks may drop idle connections after a certain period of time, which can cause the request to fail or [t
+1 −1 lines
Recorded here 9 Oct 2026 21:37 UTC
api
build-with-claude/preserved-thinking
±changed
+10−2
apichanged
build-with-claude/preserved-thinking
`"drop_block"` hides the error but doesn't fix the edit that caused it. Dropped blocks aren't billed, but a session's token usage might still increase because Claude can sometime
`"drop_block"` keeps requests succeeding, but it doesn't fix the edit that caused the mismatch, and it has a cost. Dropping blocks can significantly increase the output tokens ge
#### Output-token cost of `"drop_block"`
In Anthropic's testing on a multi-turn coding benchmark, dropping thinking blocks once per session increased output tokens by 2.5% at low effort, 3.9% at medium, 4.5% at high, and
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Recorded here 9 Oct 2026 21:37 UTC
api
api/organization/workspaces/update
±changed
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apichanged
api/organization/workspaces/update
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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api
api/organization/workspaces/create
±changed
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apichanged
api/organization/workspaces/create
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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api
api/organization/workspaces
±changed
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apichanged
api/organization/workspaces
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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Recorded here 9 Oct 2026 21:37 UTC
api
api/organization
±changed
+2−2
apichanged
api/organization
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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Recorded here 9 Oct 2026 21:37 UTC
api
api/messages/create
±changed
+9−17
apichanged
api/messages/create
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
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Recorded here 9 Oct 2026 21:37 UTC
api
api/messages/count_tokens
±changed
+9−13
apichanged
api/messages/count_tokens
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
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Recorded here 9 Oct 2026 21:37 UTC
api
api/messages/batches/results
±changed
+0−4
apichanged
api/messages/batches/results
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
+0 −4 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/messages/batches/create
±changed
+9−13
apichanged
api/messages/batches/create
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 mod
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 mod
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+9 −13 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/messages/batches
±changed
+9−29
apichanged
api/messages/batches
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 mod
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 mod
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
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Recorded here 9 Oct 2026 21:37 UTC
api
api/messages
±changed
+28−64
apichanged
api/messages
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+28 −64 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/completions/create
±changed
+0−8
apichanged
api/completions/create
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
+0 −8 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/completions
±changed
+0−12
apichanged
api/completions
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/update
±changed
+571−437
apichanged
api/beta/sessions/update
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/threads/retrieve
±changed
+53−6
apichanged
api/beta/sessions/threads/retrieve
- `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
- `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor or BetaManagedAgentsInlineAgent`
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
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api
api/beta/sessions/threads/list
±changed
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apichanged
api/beta/sessions/threads/list
- `statuses: optional array of BetaManagedAgentsSessionThreadStatus`
Return only threads that have one of these statuses.
Repeat the parameter to give more than one status. Leave it out to return threads of every status.
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/threads/events/stream
±changed
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apichanged
api/beta/sessions/threads/events/stream
- `BetaManagedAgentsStreamSessionThreadEvents = BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 34 more`
- `BetaManagedAgentsStreamSessionThreadEvents = BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 41 more`
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result.
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/threads/events/list
±changed
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apichanged
api/beta/sessions/threads/events/list
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result.
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon
- `workflow_run_id: string or null`
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api
api/beta/sessions/threads/events
±changed
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apichanged
api/beta/sessions/threads/events
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result.
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon
- `workflow_run_id: string or null`
+1667 −879 lines
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api
api/beta/sessions/threads/archive
±changed
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apichanged
api/beta/sessions/threads/archive
- `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
- `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor or BetaManagedAgentsInlineAgent`
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/threads
±changed
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apichanged
api/beta/sessions/threads
No line of the body moved in this read.
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api
api/beta/sessions/retrieve
±changed
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apichanged
api/beta/sessions/retrieve
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
+571 −437 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/list
±changed
+571−437
apichanged
api/beta/sessions/list
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/events/stream
±changed
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apichanged
api/beta/sessions/events/stream
- `BetaManagedAgentsStreamSessionEvents = BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 34 more`
- `BetaManagedAgentsStreamSessionEvents = BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 41 more`
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/
Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result.
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api
api/beta/sessions/events/send
±changed
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apichanged
api/beta/sessions/events/send
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/
The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/a
The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/ap
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/events/list
±changed
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apichanged
api/beta/sessions/events/list
- `"workflow_run.created"`
- `"workflow_run.status_running"`
- `"workflow_run.status_idle"`
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api
api/beta/sessions/events
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api/beta/sessions/events
No line of the body moved in this read.
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/create
±changed
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apichanged
api/beta/sessions/create
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
+571 −441 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions/archive
±changed
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apichanged
api/beta/sessions/archive
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
+571 −437 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/sessions
±changed
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apichanged
api/beta/sessions
No line of the body moved in this read.
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/organization/workspaces/update
±changed
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apichanged
api/beta/organization/workspaces/update
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/organization/workspaces/create
±changed
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apichanged
api/beta/organization/workspaces/create
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/organization/workspaces
±changed
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apichanged
api/beta/organization/workspaces
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/organization
±changed
+2−2
apichanged
api/beta/organization
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
minLength: 1, maxLength: 40
minLength: 1, maxLength: 255
+2 −2 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages/create
±changed
+10−20
apichanged
api/beta/messages/create
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+10 −20 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages/count_tokens
±changed
+9−13
apichanged
api/beta/messages/count_tokens
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+9 −13 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages/batches/results
±changed
+0−5
apichanged
api/beta/messages/batches/results
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- Determine which iterations exceeded long context thresholds (>=200k tokens)
+0 −5 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages/batches/create
±changed
+10−14
apichanged
api/beta/messages/batches/create
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 mod
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 mod
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+10 −14 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages/batches
±changed
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apichanged
api/beta/messages/batches
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 mod
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 mod
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+8 −32 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/messages
±changed
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apichanged
api/beta/messages
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
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
Example with a partially-filled response from Claude:
Example with a partially-filled response from Claude, for models that support prefill:
Fastest model with near-frontier intelligence
+35 −182 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/agents/versions/list
±changed
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apichanged
api/beta/agents/versions/list
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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api
api/beta/agents/versions
±changed
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api/beta/agents/versions
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/agents/update
±changed
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api/beta/agents/update
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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api
api/beta/agents/retrieve
±changed
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apichanged
api/beta/agents/retrieve
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/agents/list
±changed
+163−39
apichanged
api/beta/agents/list
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/agents/create
±changed
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apichanged
api/beta/agents/create
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
+863 −640 lines
Recorded here 9 Oct 2026 21:37 UTC
api
api/beta/agents/archive
±changed
+163−39
apichanged
api/beta/agents/archive
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
+163 −39 lines
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api
api/beta/agents
±changed
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apichanged
api/beta/agents
Fastest model with near-frontier intelligence
Fastest model with near-frontier intelligence
- `type: "coordinator"`
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Recorded here 9 Oct 2026 21:37 UTC
api
api/beta
±changed
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apichanged
api/beta
No line of the body moved in this read.
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api
release-notes/overview
±changed
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apichanged
release-notes/overview
### October 9, 2026
* You can now let a Claude Managed Agents agent use [dynamic workflows](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration#dynamic-workflows), in beta with
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Recorded here 9 Oct 2026 16:37 UTC
api
managed-agents/webhooks
±changed
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apichanged
managed-agents/webhooks
| Event | Trigger
| ---------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------
| `session.status_run_started` | Agent execution started. This triggers at every session status transition to `running`.
| `session.status_idled` | Agent awaiting input, for example, a tool permission approval or a new user message.
| `session.budget_reached` | The session reached its [budget](https://platform.claude.com/docs/en/managed-agents/budgets) and paused. Fires at most once for each budg
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api
managed-agents/tools-web-restrictions
±changed
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apichanged
managed-agents/tools-web-restrictions
In a [multiagent session](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration), every domain list that applies to a thread is enforced at the same time. An
In a [multiagent session](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration), every domain list that applies to a thread is enforced at the same time. An
* The coordinator's current lists
* The current lists of the agent that the session runs
| Setting | How it combines
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Recorded here 9 Oct 2026 16:37 UTC
api
managed-agents/tools
±changed
+2−0
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managed-agents/tools
A custom tool's name can't start with `mcp__` or `ant__`, or match the name of a built-in agent tool. A request that breaks this rule returns a 400 error. An agent that already has
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api
managed-agents/session-operations
±changed
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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`. |
| `running` | Agent is actively executing. |
| `rescheduling` | Transient error occurred, retrying automatically. |
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api
managed-agents/session-observability
±changed
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managed-agents/session-observability
Each [session thread](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration)'s own `usage` carries `list_cost` and `active_seconds` too. Per-thread figures ar
Each [session thread](https://platform.claude.com/docs/en/managed-agents/session-threads)'s own `usage` carries `list_cost` and `active_seconds` too. Per-thread figures are rounded
+1 −1 lines
Recorded here 9 Oct 2026 16:37 UTC
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