HomeDocs changes
Documentation changes
What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
821pages tracked
774 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
148 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
81 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
ReadSourcePageWhatLines
31 Jul 2026
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
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| Field | Value
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **SEP** | 1865
| **Title** | MCP Apps - Interactive User Interfaces for MCP
| **Status** | Final
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29 Jul 2026
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
The communication guidelines are published at: [https://modelcontextprotocol.io/community/communication](https://modelcontextprotocol.io/community/communication)
The communication guidelines are published at: [https://modelcontextprotocol.io/community/communication](https://modelcontextprotocol.io/community/communication.md)
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seps/2663-tasks-extension
> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
Tasks will become a foundational building block of MCP and are expected to be supported in future protocol versions. The experimental `tasks` feature in the `2025-11-25` specificat
This proposal *removes* the version of [tasks](https://modelcontextprotocol.io/specification/2025-11-25/basic/utilities/tasks) specified in the `2025-11-25` release from the core p
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
[governance-roles]: https://modelcontextprotocol.io/community/governance#roles
[governance-roles]: https://modelcontextprotocol.io/community/governance.md#roles
[transports-compat]: https://modelcontextprotocol.io/specification/draft/basic/transports#backwards-compatibility
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
[feature-matrix]: https://modelcontextprotocol.io/clients#feature-support-matrix
[feature-matrix]: https://modelcontextprotocol.io/clients.md#feature-support-matrix
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
This proposal is a mitigation against mix-up attacks; the security considerations for the mechanism itself are documented in [RFC9207 Section 4](https://datatracker.ietf.org/doc/ht
This proposal is a mitigation against mix-up attacks; the security considerations for the mechanism itself are documented in [RFC9207 Section 4](https://datatracker.ietf.org/doc/ht
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seps/2149-working-group-charter-template
> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
This SEP is a companion to [SEP-2148: MCP Contributor Ladder](./2148-contributor-ladder.md), which defines the org-wide contributor roles (Member, Maintainer, Core Maintainer, Lead
This SEP is a companion to [SEP-2148: MCP Contributor Ladder](/seps/2148-contributor-ladder.md), which defines the org-wide contributor roles (Member, Maintainer, Core Maintainer,
* Hold at least Member status on the [MCP Contributor Ladder](./2148-contributor-ladder.md)
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
This SEP is a companion to [SEP-2149: MCP Group Governance and Charter Template](./2149-working-group-charter-template.md), which defines how Working Groups and Interest Groups ope
This SEP is a companion to [SEP-2149: MCP Group Governance and Charter Template](/seps/2149-working-group-charter-template.md), which defines how Working Groups and Interest Groups
* Review the [Contributing Guide](https://modelcontextprotocol.io/community/contributing)
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
Extensions are identified using a unique *extension identifier* with the format: `{vendor-prefix}/{extension-name}`, e.g. `io.modelcontextprotocol/oauth-client-credentials` or `com
Extensions are identified using a unique *extension identifier* with the format: `{vendor-prefix}/{extension-name}`, e.g. `io.modelcontextprotocol/oauth-client-credentials` or `com
To become an official extension, extensions are created via a SEP in the [main MCP repository](https://github.com/modelcontextprotocol/modelcontextprotocol/) using the [standard SE
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
> This SEP is preserved as a historical record of the experimental tasks feature shipped in the `2025-11-25` specification. The code examples below are non-normative pseudocode wri
> This SEP is preserved as a historical record of the experimental tasks feature shipped in the `2025-11-25` specification. The code examples below are non-normative pseudocode wri
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> specification](/specification/latest.md) and its changelog for authoritative
The [tool errors specification](https://modelcontextprotocol.io/specification/2025-06-18/server/tools#error-handling) currently provides ambiguous guidance:
The [tool errors specification](https://modelcontextprotocol.io/specification/2025-06-18/server/tools.md#error-handling) currently provides ambiguous guidance:
* [MCP Tools Error Handling Specification](https://modelcontextprotocol.io/specification/2025-06-18/server/tools#error-handling)
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> specification](/specification/latest) and its changelog for authoritative
> specification](/specification/latest.md) and its changelog for authoritative
2. External authorization: MCP servers often need to access third-party APIs on behalf of users. The MCP authorization specification only covers client-to-server authorization, not
2. External authorization: MCP servers often need to access third-party APIs on behalf of users. The MCP authorization specification only covers client-to-server authorization, not
URL elicitation is fundamentally different from [MCP authorization](https://modelcontextprotocol.io/specification/2025-06-18/basic/authorization). URL elicitation is not for author
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mcp
seps/2106-json-schema-2020-12
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seps/2106-json-schema-2020-12
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mcp
seps/2085-governance-succession-and-amendment
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seps/2085-governance-succession-and-amendment
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1850-pr-based-sep-workflow
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1730-sdks-tiering-system
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seps/1730-sdks-tiering-system
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mcp
seps/1699-support-sse-polling-via-server-side-disconnect
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1686-tasks
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1613-establish-json-schema-2020-12-as-default-dialect-f
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1319-decouple-request-payload-from-rpc-methods-definiti
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seps/1319-decouple-request-payload-from-rpc-methods-definiti
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1303-input-validation-errors-as-tool-execution-errors
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1302-formalize-working-groups-and-interest-groups-in-mc
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1046-support-oauth-client-credentials-flow-in-authoriza
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1036-url-mode-elicitation-for-secure-out-of-band-intera
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1034--support-default-values-for-all-primitive-types-in
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/1024-mcp-client-security-requirements-for-local-server-
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/994-shared-communication-practicesguidelines
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mcpchanged
seps/994-shared-communication-practicesguidelines
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 994 |
| **Title** | Shared Communication Practices/Guidelines |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/990-enable-enterprise-idp-policy-controls-during-mcp-o
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seps/990-enable-enterprise-idp-policy-controls-during-mcp-o
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 990 |
| **Title** | Enable enterprise IdP policy controls during MCP OAuth flows |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/986-specify-format-for-tool-names
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seps/986-specify-format-for-tool-names
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 986 |
| **Title** | Specify Format for Tool Names |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/985-align-oauth-20-protected-resource-metadata-with-rf
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mcpchanged
seps/985-align-oauth-20-protected-resource-metadata-with-rf
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 985 |
| **Title** | Align OAuth 2.0 Protected Resource Metadata with RFC 9728 |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/973-expose-additional-metadata-for-implementations-res
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seps/973-expose-additional-metadata-for-implementations-res
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 973 |
| **Title** | Expose additional metadata for Implementations, Resources, Tools and Prompts |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/932-model-context-protocol-governance
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seps/932-model-context-protocol-governance
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 932 |
| **Title** | Model Context Protocol Governance |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/414-request-meta
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seps/414-request-meta
| Field | Value |
| ------------- | ----------------------------------------------------------------------------- |
| **SEP** | 414 |
| **Title** | Document OpenTelemetry Trace Context Propagation Conventions |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2663-tasks-extension
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+13−13
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seps/2663-tasks-extension
| Field | Value
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **SEP** | 2663
| **Title** | Tasks Extension
| **Status** | Final
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2596-spec-feature-lifecycle-and-deprecation
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seps/2596-spec-feature-lifecycle-and-deprecation
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2596 |
| **Title** | Specification Feature Lifecycle and Deprecation Policy |
| **Status** | Final |
+27 −27 lines
Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2577-deprecate-roots-sampling-and-logging
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mcpchanged
seps/2577-deprecate-roots-sampling-and-logging
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2577 |
| **Title** | Deprecate Roots, Sampling, and Logging |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2567-sessionless-mcp
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seps/2567-sessionless-mcp
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2567 |
| **Title** | Sessionless MCP via Explicit State Handles |
| **Status** | Final |
+27 −27 lines
Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2484-conformance-tests-required-for-final-seps
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seps/2484-conformance-tests-required-for-final-seps
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2484 |
| **Title** | Require Conformance Tests for Standards Track SEPs to Reach Final Status |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2468-recommend-issuer-claim-for-auth
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seps/2468-recommend-issuer-claim-for-auth
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2468 |
| **Title** | Recommend Issuer (iss) Parameter in MCP Auth Responses |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2243-http-standardization
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seps/2243-http-standardization
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2243 |
| **Title** | HTTP Header Standardization for Streamable HTTP Transport |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2207-oidc-refresh-token-guidance
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seps/2207-oidc-refresh-token-guidance
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2207 |
| **Title** | OIDC-Flavored Refresh Token Guidance |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2164-resource-not-found-error
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+22−22
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seps/2164-resource-not-found-error
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2164 |
| **Title** | Standardize Resource Not Found Error Code |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2149-working-group-charter-template
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seps/2149-working-group-charter-template
| Field | Value |
| ------------- | ---------------------------------------------------------------------------------------------------------------------------- |
| **SEP** | 2149 |
| **Title** | MCP Group Governance and Charter Template |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2148-contributor-ladder
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seps/2148-contributor-ladder
| Field | Value |
| ------------- | ---------------------------------------------------------------------------------------------------------------------------- |
| **SEP** | 2148 |
| **Title** | MCP Contributor Ladder |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2133-extensions
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seps/2133-extensions
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2133 |
| **Title** | Extensions |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2106-json-schema-2020-12
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mcpchanged
seps/2106-json-schema-2020-12
| Field | Value
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **SEP** | 2106
| **Title** | Tools `inputSchema` & `outputSchema` Conform to JSON Schema 2020-12
| **Status** | Final
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/2085-governance-succession-and-amendment
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seps/2085-governance-succession-and-amendment
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2085 |
| **Title** | Governance Succession and Amendment Procedures |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1850-pr-based-sep-workflow
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seps/1850-pr-based-sep-workflow
| Field | Value |
| ------------- | ------------------------------------------------------------------------------------------------------------------ |
| **SEP** | 1850 |
| **Title** | PR-Based SEP Workflow |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1730-sdks-tiering-system
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seps/1730-sdks-tiering-system
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1730 |
| **Title** | SDKs Tiering System |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1699-support-sse-polling-via-server-side-disconnect
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seps/1699-support-sse-polling-via-server-side-disconnect
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1699 |
| **Title** | Support SSE polling via server-side disconnect |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1686-tasks
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seps/1686-tasks
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1686 |
| **Title** | Tasks |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1613-establish-json-schema-2020-12-as-default-dialect-f
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mcpchanged
seps/1613-establish-json-schema-2020-12-as-default-dialect-f
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1613 |
| **Title** | Establish JSON Schema 2020-12 as Default Dialect for MCP |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1319-decouple-request-payload-from-rpc-methods-definiti
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seps/1319-decouple-request-payload-from-rpc-methods-definiti
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1319 |
| **Title** | Decouple Request Payload from RPC Methods Definition |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1303-input-validation-errors-as-tool-execution-errors
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+10−10
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seps/1303-input-validation-errors-as-tool-execution-errors
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1303 |
| **Title** | Input Validation Errors as Tool Execution Errors |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1302-formalize-working-groups-and-interest-groups-in-mc
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+10−10
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seps/1302-formalize-working-groups-and-interest-groups-in-mc
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1302 |
| **Title** | Formalize Working Groups and Interest Groups in MCP Governance |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1046-support-oauth-client-credentials-flow-in-authoriza
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seps/1046-support-oauth-client-credentials-flow-in-authoriza
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1046 |
| **Title** | Support OAuth client credentials flow in authorization |
| **Status** | Final |
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Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
mcp
seps/1036-url-mode-elicitation-for-secure-out-of-band-intera
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+14−14
mcpchanged
seps/1036-url-mode-elicitation-for-secure-out-of-band-intera
| Field | Value |
| ------------- | ------------------------------------------------------------------------------------------------------------------------- |
| **SEP** | 1036 |
| **Title** | URL Mode Elicitation for secure out-of-band interactions |
| **Status** | Final |
+14 −14 lines
Upstream edited 29 Jul 2026 22:46 UTC Recorded here 28 Sep 2026 22:07 UTC
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