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
767 changed this week · last read 24 Oct 2026
Claude Code CLI
228pages tracked
146 changed this week · last read 24 Oct 2026
Claude Documentation
280pages tracked
69 changed this week · last read 24 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
ReadSourcePageWhatLines
28 Sep 2026
253 pages
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mcp
seps/index
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+56−54
mcpchanged
seps/index
Each SEP is reachable by number at `/seps/<number>` (for example, [/seps/1850](/seps/1850)).
| SEP | Title | Status
| ------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- | -----------
| [SEP-2663](/seps/2663-tasks-extension) | Tasks Extension | <Badge colo
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Recorded here 28 Sep 2026 22:07 UTC
claude-docs
connectors/github/index
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claude-docschanged
connectors/github/index
| Retrieved | Not retrieved |
| -------------- | ------------------- |
| File names | Commit history |
| File contents | Pull requests |
| Branch content | Issues |
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Recorded here 28 Sep 2026 22:07 UTC
claude-docs
connectors/building/index
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+4−4
claude-docschanged
connectors/building/index
| Limit | claude.ai and Desktop | Claude Code |
| ------------------------ | ------------------------- | -------------------------------------------------------- |
| Maximum tool result size | \~150,000 characters | 25,000 tokens, configurable with `MAX_MCP_OUTPUT_TOKENS` |
| Tool call timeout | 240 seconds per tool call | Configurable with `MCP_TOOL_TIMEOUT` |
| Limit | claude.ai and Desktop | Claude Code |
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Recorded here 28 Sep 2026 22:07 UTC
claude-docs
claude-science/changelog
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+10−0
claude-docschanged
claude-science/changelog
<Update label="0.1.54" description="September 28, 2026">
* Sessions on Claude Sonnet 5.5 now default to Extra high reasoning effort
* Windows: after an update, the app window reopens on the new version by itself
* Pinned artifacts (formerly starred) and pinned projects now show a pushpin instead of a star
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Upstream edited 28 Sep 2026 22:00 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/draft/deprecated
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+8−8
mcpchanged
specification/draft/deprecated
| Feature | Deprecation SEP
| ----------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------
| [Roots](/specification/draft/client/roots) | [SEP-2577](https://github.com/modelcontextprotocol/model
| [Sampling](/specification/draft/client/sampling) | [SEP-2577](https://github.com/modelcontextprotocol/model
| [Logging](/specification/draft/server/utilities/logging) | [SEP-2577](https://github.com/modelcontextprotocol/model
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mcp
specification/draft/basic/transports/streamable-http
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+19−19
mcpchanged
specification/draft/basic/transports/streamable-http
| Header Name | Source Field | Required For |
| ------------ | ----------------------------- | ------------------------------------------------------ |
| `Mcp-Method` | `method` | All requests |
| `Mcp-Name` | `params.name` or `params.uri` | `tools/call`, `resources/read`, `prompts/get` requests |
| Header Name | Source Field | Required For |
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mcp
specification/draft/basic/patterns/subscriptions
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+5−5
mcpchanged
specification/draft/basic/patterns/subscriptions
| Field | Type | Description |
| ----------------------- | ---------- | ----------------------------------------------------------------- |
| `toolsListChanged` | `boolean` | Receive `notifications/tools/list_changed` when tools change |
| `promptsListChanged` | `boolean` | Receive `notifications/prompts/list_changed` when prompts change |
| `resourcesListChanged` | `boolean` | Receive `notifications/resources/list_changed` when list changes |
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mcp
specification/2026-07-28/server/utilities/logging
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+10−10
mcpchanged
specification/2026-07-28/server/utilities/logging
| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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mcp
specification/2026-07-28/server/utilities/completion
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+3−3
mcpchanged
specification/2026-07-28/server/utilities/completion
| Type | Description | Example |
| -------------- | ----------------------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| Type | Description | Example |
| - | - | - |
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mcp
specification/2026-07-28/server/utilities/caching
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+3−3
mcpchanged
specification/2026-07-28/server/utilities/caching
| Value | Meaning
| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------
| `"public"` | The response does not contain user-specific data. Any client, shared gateway, or caching proxy **MAY** store and serve the cached response to any user.
| Value | Meaning |
| - | - |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/deprecated
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+8−8
mcpchanged
specification/2026-07-28/deprecated
| Feature | Deprecation SEP
| ---------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------
| [Roots](/specification/2026-07-28/client/roots) | [SEP-2577](https://github.com/modelcontextprotocol/
| [Sampling](/specification/2026-07-28/client/sampling) | [SEP-2577](https://github.com/modelcontextprotocol/
| [Logging](/specification/2026-07-28/server/utilities/logging) | [SEP-2577](https://github.com/modelcontextprotocol/
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/client/elicitation
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+8−8
mcpchanged
specification/2026-07-28/client/elicitation
| Name | Type | Options | Description |
| --------- | ------ | ------------- | -------------------------------------------------------------------------------------- |
| `mode` | string | `form`, `url` | The mode of the elicitation. Optional for form mode (defaults to `"form"` if omitted). |
| `message` | string | | A human-readable message explaining why the interaction is needed. |
| Name | Type | Options | Description |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/basic/versioning
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+9−9
mcpchanged
specification/2026-07-28/basic/versioning
| Client | Server | Outcome
| -------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Modern | Modern | Works. `server/discover` is optional; version mismatches surface as `UnsupportedProtocolVersionError` and the client retries with a mutually supported versi
| Modern | Legacy | Fails. The server may reject the request with an implementation-defined error, stay silent, or even process an era-ambiguous method under legacy semantics.
| Dual-era | Modern | Works. The stdio probe returns a `DiscoverResult` (or `UnsupportedProtocolVersionError`); on HTTP, the first modern request succeeds or returns a modern err
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/basic/transports/streamable-http
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+19−19
mcpchanged
specification/2026-07-28/basic/transports/streamable-http
| Header Name | Source Field | Required For |
| ------------ | ----------------------------- | ------------------------------------------------------ |
| `Mcp-Method` | `method` | All requests |
| `Mcp-Name` | `params.name` or `params.uri` | `tools/call`, `resources/read`, `prompts/get` requests |
| Header Name | Source Field | Required For |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/basic/patterns/subscriptions
±changed
+5−5
mcpchanged
specification/2026-07-28/basic/patterns/subscriptions
| Field | Type | Description |
| ----------------------- | ---------- | ----------------------------------------------------------------- |
| `toolsListChanged` | `boolean` | Receive `notifications/tools/list_changed` when tools change |
| `promptsListChanged` | `boolean` | Receive `notifications/prompts/list_changed` when prompts change |
| `resourcesListChanged` | `boolean` | Receive `notifications/resources/list_changed` when list changes |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2026-07-28/basic/patterns/mrtr
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+5−5
mcpchanged
specification/2026-07-28/basic/patterns/mrtr
| Client Request | Supports InputRequiredResult |
| -------------------------------------------------------------------------------- | ---------------------------- |
| [`prompts/get`](/specification/2026-07-28/server/prompts#getting-a-prompt) | Yes |
| [`resources/read`](/specification/2026-07-28/server/resources#reading-resources) | Yes |
| [`tools/call`](/specification/2026-07-28/server/tools#calling-tools) | Yes |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-11-25/server/utilities/logging
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+10−10
mcpchanged
specification/2025-11-25/server/utilities/logging
| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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mcp
specification/2025-11-25/server/utilities/completion
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+4−4
mcpchanged
specification/2025-11-25/server/utilities/completion
| Type | Description | Example |
| -------------- | --------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| `ref/resource` | References a resource URI | `{"type": "ref/resource", "uri": "file:///{path}"}` |
| Type | Description | Example |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-11-25/client/elicitation
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+10−10
mcpchanged
specification/2025-11-25/client/elicitation
| Name | Type | Options | Description |
| --------- | ------ | ------------- | -------------------------------------------------------------------------------------- |
| `mode` | string | `form`, `url` | The mode of the elicitation. Optional for form mode (defaults to `"form"` if omitted). |
| `message` | string | | A human-readable message explaining why the interaction is needed. |
| Name | Type | Options | Description |
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mcp
specification/2025-11-25/basic/utilities/tasks
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+9−9
mcpchanged
specification/2025-11-25/basic/utilities/tasks
| Capability | Description |
| --------------------------- | ---------------------------------------------------- |
| `tasks.list` | Server supports the `tasks/list` operation |
| `tasks.cancel` | Server supports the `tasks/cancel` operation |
| Capability | Description |
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mcp
specification/2025-11-25/basic/lifecycle
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+14−14
mcpchanged
specification/2025-11-25/basic/lifecycle
| Category | Capability | Description |
| -------- | -------------- | --------------------------------------------------------------------------------------------- |
| Client | `roots` | Ability to provide filesystem [roots](/specification/2025-11-25/client/roots) |
| Client | `sampling` | Support for LLM [sampling](/specification/2025-11-25/client/sampling) requests |
| Client | `elicitation` | Support for server [elicitation](/specification/2025-11-25/client/elicitation) requests |
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mcp
specification/2025-11-25/basic/authorization
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+5−5
mcpchanged
specification/2025-11-25/basic/authorization
| Status Code | Description | Usage |
| ----------- | ------------ | ------------------------------------------ |
| 401 | Unauthorized | Authorization required or token invalid |
| 403 | Forbidden | Invalid scopes or insufficient permissions |
| 400 | Bad Request | Malformed authorization request |
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mcp
specification/2025-06-18/server/utilities/logging
±changed
+10−10
mcpchanged
specification/2025-06-18/server/utilities/logging
| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-06-18/server/utilities/completion
±changed
+4−4
mcpchanged
specification/2025-06-18/server/utilities/completion
| Type | Description | Example |
| -------------- | --------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| `ref/resource` | References a resource URI | `{"type": "ref/resource", "uri": "file:///{path}"}` |
| Type | Description | Example |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-06-18/basic/lifecycle
±changed
+12−12
mcpchanged
specification/2025-06-18/basic/lifecycle
| Category | Capability | Description |
| -------- | -------------- | ----------------------------------------------------------------------------------------- |
| Client | `roots` | Ability to provide filesystem [roots](/specification/2025-06-18/client/roots) |
| Client | `sampling` | Support for LLM [sampling](/specification/2025-06-18/client/sampling) requests |
| Client | `elicitation` | Support for server [elicitation](/specification/2025-06-18/client/elicitation) requests |
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mcp
specification/2025-06-18/basic/authorization
±changed
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mcpchanged
specification/2025-06-18/basic/authorization
| Status Code | Description | Usage |
| ----------- | ------------ | ------------------------------------------ |
| 401 | Unauthorized | Authorization required or token invalid |
| 403 | Forbidden | Invalid scopes or insufficient permissions |
| 400 | Bad Request | Malformed authorization request |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-03-26/server/utilities/logging
±changed
+10−10
mcpchanged
specification/2025-03-26/server/utilities/logging
| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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mcp
specification/2025-03-26/server/utilities/completion
±changed
+4−4
mcpchanged
specification/2025-03-26/server/utilities/completion
| Type | Description | Example |
| -------------- | --------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| `ref/resource` | References a resource URI | `{"type": "ref/resource", "uri": "file:///{path}"}` |
| Type | Description | Example |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2025-03-26/basic/lifecycle
±changed
+11−11
mcpchanged
specification/2025-03-26/basic/lifecycle
| Category | Capability | Description |
| -------- | -------------- | ----------------------------------------------------------------------------------------- |
| Client | `roots` | Ability to provide filesystem [roots](/specification/2025-03-26/client/roots) |
| Client | `sampling` | Support for LLM [sampling](/specification/2025-03-26/client/sampling) requests |
| Client | `experimental` | Describes support for non-standard experimental features |
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mcp
specification/2025-03-26/basic/authorization
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mcpchanged
specification/2025-03-26/basic/authorization
| Endpoint | Default Path | Description |
| ---------------------- | ------------ | ------------------------------------ |
| Authorization Endpoint | /authorize | Used for authorization requests |
| Token Endpoint | /token | Used for token exchange & refresh |
| Registration Endpoint | /register | Used for dynamic client registration |
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mcp
specification/2024-11-05/server/utilities/logging
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mcpchanged
specification/2024-11-05/server/utilities/logging
| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2024-11-05/server/utilities/completion
±changed
+4−4
mcpchanged
specification/2024-11-05/server/utilities/completion
| Type | Description | Example |
| -------------- | --------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| `ref/resource` | References a resource URI | `{"type": "ref/resource", "uri": "file:///{path}"}` |
| Type | Description | Example |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
specification/2024-11-05/basic/lifecycle
±changed
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mcpchanged
specification/2024-11-05/basic/lifecycle
| Category | Capability | Description |
| -------- | -------------- | ----------------------------------------------------------------------------------- |
| Client | `roots` | Ability to provide filesystem [roots](/specification/2024-11-05/client/roots) |
| Client | `sampling` | Support for LLM [sampling](/specification/2024-11-05/client/sampling) requests |
| Client | `experimental` | Describes support for non-standard experimental features |
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mcp
registry/versioning
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+21−21
mcpchanged
registry/versioning
| Example | Type | Guidance |
| -------------- | ------------------- | ------------------------------ |
| `1.0.0` | semantic version | **Recommended** |
| `2.1.3-alpha` | semantic prerelease | **Recommended** |
| `1.0.0-beta.1` | semantic prerelease | **Recommended** |
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mcp
registry/quickstart
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+4−4
mcpchanged
registry/quickstart
| Error Message | Action
| --------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------
| "Registry validation failed for package" | Ensure your package includes the required validation information (e.g, `mcpName` property in `package.json`).
| "Invalid or expired Registry JWT token" | Re-authenticate by running `mcp-publisher login github`.
| Error Message | Action |
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
registry/github-actions
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+3−3
mcpchanged
registry/github-actions
| Error Message | Action
| --------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------
| "Authentication failed" | Ensure `id-token: write` permission is set for OIDC, or check secrets.
| Error Message | Action |
| - | - |
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mcp
registry/authentication
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+4−4
mcpchanged
registry/authentication
| Authentication | Name Format | Example Name |
| -------------- | ----------------------------------------------- | ------------------------------------ |
| GitHub-based | `io.github.username/*` or `io.github.orgname/*` | `io.github.alice/weather-server` |
| domain-based | `com.example.*/*` | `io.modelcontextprotocol/everything` |
| Authentication | Name Format | Example Name |
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mcp
docs/draft/learn/server-concepts
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+18−18
mcpchanged
docs/draft/learn/server-concepts
| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/draft/learn/client-concepts
±changed
+5−5
mcpchanged
docs/draft/learn/client-concepts
| Feature | Explanation
| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Elicitation** | Elicitation enables servers to request specific information from users during interactions, providing a structured way for servers to gather information on dema
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](
| **Sampling** | Sampling allows servers to request LLM completions through the client, enabling an agentic workflow. This approach puts the client in complete control of user p
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2026-07-28/learn/server-concepts
±changed
+18−18
mcpchanged
docs/2026-07-28/learn/server-concepts
| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2026-07-28/learn/client-concepts
±changed
+5−5
mcpchanged
docs/2026-07-28/learn/client-concepts
| Feature | Explanation
| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Elicitation** | Elicitation enables servers to request specific information from users during interactions, providing a structured way for servers to gather information on dema
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](
| **Sampling** | Sampling allows servers to request LLM completions through the client, enabling an agentic workflow. This approach puts the client in complete control of user p
+5 −5 lines
Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2025-11-25/learn/server-concepts
±changed
+18−18
mcpchanged
docs/2025-11-25/learn/server-concepts
| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
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Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2025-11-25/learn/client-concepts
±changed
+5−5
mcpchanged
docs/2025-11-25/learn/client-concepts
| Feature | Explanation
| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Elicitation** | Elicitation enables servers to request specific information from users during interactions, providing a structured way for servers to gather information on dema
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism.
| **Sampling** | Sampling allows servers to request LLM completions through the client, enabling an agentic workflow. This approach puts the client in complete control of user p
+5 −5 lines
Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2025-06-18/learn/server-concepts
±changed
+18−18
mcpchanged
docs/2025-06-18/learn/server-concepts
| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
+18 −18 lines
Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2025-06-18/learn/client-concepts
±changed
+5−5
mcpchanged
docs/2025-06-18/learn/client-concepts
| Feature | Explanation
| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Elicitation** | Elicitation enables servers to request specific information from users during interactions, providing a structured way for servers to gather information on dema
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism.
| **Sampling** | Sampling allows servers to request LLM completions through the client, enabling an agentic workflow. This approach puts the client in complete control of user p
+5 −5 lines
Upstream edited 28 Sep 2026 21:57 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
docs/2025-03-26/learn/server-concepts
±changed
+18−18
mcpchanged
docs/2025-03-26/learn/server-concepts
| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
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| Feature | Explanation
| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism.
| Feature | Explanation | Example |
| - | - | - |
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| Feature | Explanation
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources.
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| Feature | Explanation
| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism.
| Feature | Explanation | Example |
| - | - | - |
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9. **Finalization**: Once accepted, the reference implementation must be completed. For Standards Track SEPs with observable protocol behavior, a [conformance test](#conformance-te
9. **Finalization**: Once accepted, the reference implementation must be completed. For Standards Track SEPs with observable protocol behavior, a [conformance test](#conformance-te
| Status | Meaning |
| ------------ | ------------------------------------------------ |
| `draft` | Has a sponsor, undergoing informal review |
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| Level | Description | Example Use Case |
| --------- | -------------------------------- | -------------------------- |
| debug | Detailed debugging information | Function entry/exit points |
| info | General informational messages | Operation progress updates |
| notice | Normal but significant events | Configuration changes |
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| Type | Description | Example |
| -------------- | ----------------------------------------- | --------------------------------------------------- |
| `ref/prompt` | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}` |
| Type | Description | Example |
| - | - | - |
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| Value | Meaning
| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------
| `"public"` | The response does not contain user-specific data. Any client, shared gateway, or caching proxy **MAY** store and serve the cached response to any user.
| Value | Meaning |
| - | - |
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| Name | Type | Options | Description |
| --------- | ------ | ------------- | -------------------------------------------------------------------------------------- |
| `mode` | string | `form`, `url` | The mode of the elicitation. Optional for form mode (defaults to `"form"` if omitted). |
| `message` | string | | A human-readable message explaining why the interaction is needed. |
| Name | Type | Options | Description |
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| Client | Server | Outcome
| -------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Modern | Modern | Works. `server/discover` is optional; version mismatches surface as `UnsupportedProtocolVersionError` and the client retries with a mutually supported versi
| Modern | Legacy | Fails. The server may reject the request with an implementation-defined error, stay silent, or even process an era-ambiguous method under legacy semantics.
| Dual-era | Modern | Works. The stdio probe returns a `DiscoverResult` (or `UnsupportedProtocolVersionError`); on HTTP, the first modern request succeeds or returns a modern err
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| Client Request | Supports InputRequiredResult |
| --------------------------------------------------------------------------- | ---------------------------- |
| [`prompts/get`](/specification/draft/server/prompts#getting-a-prompt) | Yes |
| [`resources/read`](/specification/draft/server/resources#reading-resources) | Yes |
| [`tools/call`](/specification/draft/server/tools#calling-tools) | Yes |
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This matrix shows which MCP clients support each [official extension](/extensions/overview). Extensions are always opt-in: a client only uses an extension if both client and server
This matrix shows which MCP clients support each [official extension](/extensions/overview.md). Extensions are always opt-in: a client only uses an extension if both client and ser
| [MCP Apps](/extensions/apps/overview) | `io.modelcontextprotocol/ui` | Interactive HTML interfaces rendered inline in the conversation |
| [OAuth Client Credentials](/extensions/auth/oauth-client-credentials) | `io.modelcontextprotocol/oauth-client-credentials` | Machine-to-machine auth without interactive user logi
| [Enterprise-Managed Authorization](/extensions/auth/enterprise-managed-authorization) | `io.modelcontextprotocol/enterprise-managed-authorization` | Centralized access control vi
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export const CHECK = () => <span className="flex justify-center">
<Icon icon="check" iconType="solid" size={18} className="text-green-500" />
</span>;
<Note>
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| Extension | Identifier | Description
| ------------------------------------------------------------------------------------- | ---------------------------------------------------------- | -----------------------------
| [MCP Apps](/extensions/apps/overview) | `io.modelcontextprotocol/ui` | Interactive HTML interfaces r
| [OAuth Client Credentials](/extensions/auth/oauth-client-credentials) | `io.modelcontextprotocol/oauth-client-credentials` | Machine-to-machine auth witho
| [Enterprise-Managed Authorization](/extensions/auth/enterprise-managed-authorization) | `io.modelcontextprotocol/enterprise-managed-authorization` | Centralized access control vi
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Build MCP servers and clients using our official SDKs. SDKs are classified into tiers based on feature completeness, protocol support, and maintenance commitment. Learn more about
Build MCP servers and clients using our official SDKs. SDKs are classified into tiers based on feature completeness, protocol support, and maintenance commitment. Learn more about
See [SDK Tiering System](/community/sdk-tiers) for details on what each tier means.
See [SDK Tiering System](/community/sdk-tiers.md) for details on what each tier means.
> **[Build a Server](/docs/draft/develop/build-server)**
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docs/2026-07-28/sdk
Build MCP servers and clients using our official SDKs. SDKs are classified into tiers based on feature completeness, protocol support, and maintenance commitment. Learn more about
Build MCP servers and clients using our official SDKs. SDKs are classified into tiers based on feature completeness, protocol support, and maintenance commitment. Learn more about
See [SDK Tiering System](/community/sdk-tiers) for details on what each tier means.
See [SDK Tiering System](/community/sdk-tiers.md) for details on what each tier means.
> **[Build a Server](/docs/2026-07-28/develop/build-server)**
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| <Icon icon="square-js" size={24} /> [TypeScript](https://ts.sdk.modelcontextprotocol.io) | [modelcontextprotocol/typescript-sdk](https://github.com/modelcontextprotocol/typescr
| <Icon icon="python" size={24} /> [Python](https://py.sdk.modelcontextprotocol.io) | [modelcontextprotocol/python-sdk](https://github.com/modelcontextprotocol/python-sdk) | <Bad
| <Icon icon="square-c" size={24} /> [C#](https://csharp.sdk.modelcontextprotocol.io) | [modelcontextprotocol/csharp-sdk](https://github.com/modelcontextprotocol/csharp-sdk) | <B
| <Icon icon="golang" size={24} /> [Go](https://go.sdk.modelcontextprotocol.io) | [modelcontextprotocol/go-sdk](https://github.com/modelcontextprotocol/go-sdk) | <Badge color="bl
| <Icon icon="rust" size={24} /> [Rust](https://rust.sdk.modelcontextprotocol.io) | [modelcontextprotocol/rust-sdk](https://github.com/modelcontextprotocol/rust-sdk) | <Badge col
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| <Icon icon="square-js" size={24} /> [TypeScript](https://ts.sdk.modelcontextprotocol.io) | [modelcontextprotocol/typescript-sdk](https://github.com/modelcontextprotocol/typescr
| <Icon icon="python" size={24} /> [Python](https://py.sdk.modelcontextprotocol.io) | [modelcontextprotocol/python-sdk](https://github.com/modelcontextprotocol/python-sdk) | <Bad
| <Icon icon="square-c" size={24} /> [C#](https://csharp.sdk.modelcontextprotocol.io) | [modelcontextprotocol/csharp-sdk](https://github.com/modelcontextprotocol/csharp-sdk) | <B
| <Icon icon="golang" size={24} /> [Go](https://go.sdk.modelcontextprotocol.io) | [modelcontextprotocol/go-sdk](https://github.com/modelcontextprotocol/go-sdk) | <Badge color="bl
| <Icon icon="rust" size={24} /> [Rust](https://rust.sdk.modelcontextprotocol.io) | [modelcontextprotocol/rust-sdk](https://github.com/modelcontextprotocol/rust-sdk) | <Badge col
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| SDK | Repository
| :----------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------
| <Icon icon="square-js" size={24} /> [TypeScript](https://ts.sdk.modelcontextprotocol.io) | [modelcontextprotocol/typescript-sdk](https://github.com/modelcontextprotocol/typescr
| <Icon icon="python" size={24} /> [Python](https://py.sdk.modelcontextprotocol.io) | [modelcontextprotocol/python-sdk](https://github.com/modelcontextprotocol/python-sdk)
| <Icon icon="square-c" size={24} /> [C#](https://csharp.sdk.modelcontextprotocol.io) | [modelcontextprotocol/csharp-sdk](https://github.com/modelcontextprotocol/csharp-sdk)
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| SDK | Repository
| :----------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------
| <Icon icon="square-js" size={24} /> [TypeScript](https://ts.sdk.modelcontextprotocol.io) | [modelcontextprotocol/typescript-sdk](https://github.com/modelcontextprotocol/typescr
| <Icon icon="python" size={24} /> [Python](https://py.sdk.modelcontextprotocol.io) | [modelcontextprotocol/python-sdk](https://github.com/modelcontextprotocol/python-sdk)
| <Icon icon="square-c" size={24} /> [C#](https://csharp.sdk.modelcontextprotocol.io) | [modelcontextprotocol/csharp-sdk](https://github.com/modelcontextprotocol/csharp-sdk)
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* Added support for Claude Sonnet 5.5.
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| MDM key | Type | Description |
| ------------------------------------------------------------------------------------------------------------------------ | --------- | ------------------------------------- |
| [`inferenceIdpAuthFlow`](/docs/third-party/claude-desktop/configuration#inferenceidpauthflow) | `enum` | Identity provider sign-in flow
| [`inferenceIdpOidc`](/docs/third-party/claude-desktop/configuration#inferenceidpoidc) | `object` | Identity provider (OIDC)
| MDM key | Type | Description |
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| Component | What it adds |
| ---------- | ---------------------------------------------------------- |
| Skills | Reusable instructions that teach Claude a workflow |
| Component | What it adds |
| - | - |
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<Update label="v2.9939.4" description="2026-09-27">
No configuration changes in this release.
</Update>
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Select **Discover** to see available plugins. The default marketplace
is Anthropic's official catalog; you can add other marketplaces by URL.
Select **Discover** to see available plugins. The default marketplace is
Anthropic's official catalog; you can add other marketplaces by URL.
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<Update label="v2.9939.4" description="2026-09-27">
Bundled Claude Code version: 2.1.284.
**General**
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| Identifier | Value |
| ---------------------- | ---------------------- |
| Package name | `Claude` |
| Package family name | `Claude_pzs8sxrjxfjjc` |
| Publisher display name | Anthropic, PBC |
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The desktop application and the sandbox honor the operating system's proxy settings, and a single allowlist controls outbound network access from Claude's tools. You manage the all
The desktop application follows the operating system's proxy settings, and a single allowlist controls outbound network access from Claude's tools. You manage the allowlist with th
For configuration and model inference, the application reaches the Claude for Government service hostname provided to your agency during onboarding. Sign-in happens in the user
For configuration and model inference, the application reaches the Claude for Government service hostname provided to your agency during onboarding. Sign-in happens in the user
Yes. Both the desktop application and the sandbox honor the operating system's proxy settings, including PAC URLs, and route all outbound traffic through your proxy. TLS inspec
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* **`www.claudeusercontent.com`.** This host serves the frame that displays artifact previews.
* **Hosts for icons, previews, and widgets.** For connector icons, the artifact preview frame, and the interactive widgets that some connectors display, the app reaches the hosts l
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| Message
| :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| "The check can't run right now. Try again later, or skip the check and record why."
| "Too many checks in a short time." followed by how long to wait
| "Too many attempts in a short time." in the **Connect an authorization server** dialog
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| Field | What to enter
| :--------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------
| **Name** | A label for this connection (for example "Internal billing API")
| **Credential type** | Pick the type that matches how the API authenticates; see [Credential types](#credential-types)
| **Allowed websites** | The API's host (for example `api.example.com`). A wildcard is allowed as the leftmost label. You can't enter `*` alone here; a credential is always
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* **An S3 upload sent in chunks.** The AWS CLI (2.23.0 and later) and the AWS SDKs that compute upload checksums by default can send S3 uploads in chunks with a checksum trailer. A
**How to resolve**
| Cause | Do this
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Claude can call the endpoint with `curl`, an AWS SDK, or the AWS CLI. The sandbox holds no real AWS credentials, so a CLI or SDK signs the request with placeholder values; Agent Pr
Claude can call the endpoint with `curl`, an AWS SDK, or the AWS CLI. The sandbox holds no real AWS credentials, so a CLI or SDK signs the request with placeholder values; Agent Pr
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For how your organization's model settings apply in Slack, see [Models your organization allows](/docs/claude-tag/admins/customize#models-your-organization-allows).
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| Layer | What it is | W
| :---------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------- | :
| **Connections** | Credentials for the systems Claude can reach (GitHub, Drive, Datadog, your APIs) | O
| **Plugins and skills** | Instructions that teach Claude how to use a tool or follow a process. A plugin bundles one or more [skills](https://code.claude.com/docs/en/skills). | O
| **Custom instructions** | Standing guidance read in every session at a scope (team conventions, output formats). Outranks channel memory. | O
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## Settings no one can change
## Name, handle, and avatar of the Claude app
* The Claude app's name, @-handle, and avatar in Slack are the same in every workspace; there is no rename or rebrand setting.
The Claude app's name, @-handle, and avatar in Slack are the same in every workspace; there is no rename or rebrand setting.
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<p className="tm-hero-lede">Anyone in a channel can tag Claude into a problem and hand it work: reproduce a bug and open a pull request, turn a decision thread into a doc, asse
<p className="tm-hero-lede">Anyone in a Slack channel can tag Claude into a problem and hand it work: reproduce a bug and open a pull request, turn a decision thread into a doc
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<Card id="claude-sonnet-5-5" title="Claude Sonnet 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5-5" />
<Card id="claude-sonnet-5" title="Claude Sonnet 5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5" />
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* [Claude Code cloud sessions](https://code.claude.com/docs/en/claude-code-on-the-web), which run on cloud infrastructure instead of the user's machine. These cloud sessions are no
* [Claude Code cloud sessions](https://code.claude.com/docs/en/claude-code-on-the-web) (including Claude Code routines that run in the cloud), which run on cloud infrastructure ins
A session is owned by either a user or an agent, never both. For user-owned sessions, `user` carries the owner's ID and email address (`email_address` is `null` when the user is no
A session is owned by either a user or an agent, never both. For user-owned sessions, `user` carries the owner's ID and email address (`email_address` is `null` when the user is no
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Local sessions are captured as their requests reach the Claude API, so nothing is installed on the device, and on-device activity that never reaches the API is not captured. Cl
Local sessions are captured as their requests reach the Claude API, so nothing is installed on the device, and on-device activity that never reaches the API is not captured. Cl
Session transcripts have boundaries of their own. Local sessions are captured only as their requests reach the Claude API, so on-device activity that never reaches the API is n
Session transcripts have boundaries of their own. Local sessions are captured only as their requests reach the Claude API, so on-device activity that never reaches the API is n
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| `user_actor` | A signed-in claude.ai or Claude Console user took the action.
| `user_actor` | A signed-in claude.ai or Claude Console user took the action, or a process Anthropic runs on that user's behalf did (see the paragraph after this t
A `user_actor` activity does not always mean the user took the action. Processes that Anthropic runs on a user's behalf can currently appear as `user_actor` for the affected user r
A `user_actor` activity does not always mean the user took the action. Processes that Anthropic runs on a user's behalf can currently appear as `user_actor` for the affected user r
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* **Events arrive on your existing feed.** Activities are accessible through your [Compliance API Activity Feed](https://platform.claude.com/docs/en/manage-claude/compliance-activi
* **Events arrive on your existing feed.** Activities are accessible through your [Compliance API Activity Feed](https://platform.claude.com/docs/en/manage-claude/compliance-activi
* **Events are tamper-evident.** Each event recorded after your organization's [transparency log](https://platform.claude.com/docs/en/manage-claude/access-transparency-log) (beta)
| Field | Type | Description
| ------------------------- | --------------- | ------------------------------------------------------------------------------------------------------------------------------------
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auto-mode-config
| Boundary | Mechanism | Behavior in auto mode
| :-------------------------------- | :--------------------------------------------------------- | :--------------------------------------------------------------------------------
| Prompt before the action | `permissions.ask` | Always prompts for a command that matches a content-scoped rule like the recipe a
| Never run the action | `permissions.deny` | Blocks before the classifier is consulted. Neither the classifier nor user intent
| Boundary | Mechanism | Behavior in auto mode |
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The text in square brackets, such as `[Data Exfiltration]`, is the name of the rule the classifier matched. To read that rule's full wording, see [Inspect the defaults and your eff
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| Scope | Loads in | Shared with team | Stored in |
| ------------------------- | -------------------- | ------------------------ | --------------------------- |
| [Local](#local-scope) | Current project only | No | `~/.claude.json` |
| Scope | Loads in | Shared with team | Stored in |
| - | - | - | - |
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| Constraint | Effect
| :---------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------
| Constraint | Effect |
| :- | :- |
| No backend | An artifact is a static page. It can't authenticate viewers itself.
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Anthropic also provides some connectors itself, without you or an admin adding them. On accounts where [Claude Docs](/docs/en/artifacts#write-a-document-with-claude-docs) is availa
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| `/design [brief]` | **[Skill](/docs/en/skills#bundled-skills).** Draft UI mockups, scre
| `/design [brief]` | **[Skill](/docs/en/skills#bundled-skills).** Draft UI mockups, scre
| `/slides [brief]` | **[Skill](/docs/en/skills#bundled-skills).** Make a new presentatio
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## Draft a design canvas
To mock up a UI, a screen flow, a landing page, or a poster rather than build a page, run `/design` with a brief. Claude drafts the design as artboards on one canvas and publishes
## Start from a Slides, Design, or Docs template
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### September 28, 2026
* We've launched **Claude Sonnet 5.5** (`claude-sonnet-5-5`). It's available on the Claude API, [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/cla
* Code written for Claude Sonnet 5 can break on Claude Sonnet 5.5 in five ways. To turn off up-front thinking, send `thinking: {"type": "between_tools"}` instead of `"disabled"`, a
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<Note>
Claude Sonnet 5.5 is the current Sonnet model. See [What's new in Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5).
</Note>
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description: "Claude Sonnet 5 at a glance: what it's for, model IDs on every platform, context window, output limits, pricing, availability, and the guides and resources for buildi
description: "Claude Sonnet 5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 5.5 is the cu
**Latest.** Released June 30, 2026.
**Legacy.** Released June 30, 2026.
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description: "Claude Sonnet 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.6 is a le
description: "Claude Sonnet 4.6 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.6 is a le
Although Claude Sonnet 4.6 is still available, you should consider migrating to Claude Sonnet 5 for improved performance. [See Claude Sonnet 5](https://platform.claude.com/docs/en/
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
| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowle
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