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
808pages tracked
587 changed this week · last read 22 Oct 2026
Claude Code CLI
228pages tracked
146 changed this week · last read 22 Oct 2026
Claude Documentation
278pages tracked
74 changed this week · last read 22 Oct 2026
Model Context Protocol
357pages tracked
163 changed this week · last read 21 Oct 2026
100 on this page
786 of the ledger's changes in mcp. Show every change
ReadSourcePageWhatLines
28 Sep 2026
82 pages
+12519 −12889 lines
mcp
specification/2025-11-25/basic/authorization
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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
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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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mcp
specification/2025-06-18/server/utilities/completion
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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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mcp
specification/2025-06-18/basic/lifecycle
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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
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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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mcp
specification/2025-03-26/server/utilities/logging
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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
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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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mcp
specification/2025-03-26/basic/lifecycle
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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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mcp
specification/2024-11-05/server/utilities/completion
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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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mcp
specification/2024-11-05/basic/lifecycle
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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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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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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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mcp
registry/github-actions
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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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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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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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mcp
docs/draft/learn/client-concepts
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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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mcp
docs/2026-07-28/learn/server-concepts
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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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mcp
docs/2026-07-28/learn/client-concepts
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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
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mcp
docs/2025-11-25/learn/server-concepts
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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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mcp
docs/2025-11-25/learn/client-concepts
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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
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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
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mcp
docs/2025-06-18/learn/client-concepts
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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
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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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mcp
docs/2025-03-26/learn/client-concepts
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mcpchanged
docs/2025-03-26/learn/client-concepts
| 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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mcp
docs/2024-11-05/learn/server-concepts
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mcpchanged
docs/2024-11-05/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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mcp
docs/2024-11-05/learn/client-concepts
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docs/2024-11-05/learn/client-concepts
| 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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mcp
community/sep-guidelines
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community/sep-guidelines
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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mcp
specification/draft/server/utilities/logging
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specification/draft/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/draft/server/utilities/completion
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specification/draft/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/draft/server/utilities/caching
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specification/draft/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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mcp
specification/draft/client/elicitation
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specification/draft/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/draft/basic/versioning
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specification/draft/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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mcp
specification/draft/basic/patterns/mrtr
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specification/draft/basic/patterns/mrtr
| 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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mcp
extensions/client-matrix
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extensions/client-matrix
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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Upstream edited 28 Sep 2026 21:56 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
extensions/client-matrix
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extensions/client-matrix
| 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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mcp
docs/draft/sdk
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docs/draft/sdk
| <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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mcp
docs/2026-07-28/sdk
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docs/2026-07-28/sdk
| <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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docs/draft/sdk
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docs/draft/sdk
| 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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mcp
docs/2026-07-28/sdk
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docs/2026-07-28/sdk
| 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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24 Sep 2026
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mcp
community/interest-groups/scientific-computing
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community/interest-groups/scientific-computing
| Role | Name | Organization | GitHub | Term |
| ----------- | ----------- | ------------ | -------------------------------------------- | ------- |
| Facilitator | Cory Kinney | — | [@corykinney](https://github.com/corykinney) | Initial |
| Role | Name | Organization | GitHub | Term |
| - | - | - | - | - |
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mcp
community/interest-groups/scientific-computing
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mcpnew page
community/interest-groups/scientific-computing
No line of the body moved in this read.
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23 Sep 2026
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mcp
docs/draft/getting-started/intro
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docs/draft/getting-started/intro
<Card title="Understand concepts" icon="book" href="/docs/draft/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/draft/learn/architecture">
<Card title="Security" icon="lock" href="/docs/draft/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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docs/2026-07-28/getting-started/intro
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<Card title="Understand concepts" icon="book" href="/docs/2026-07-28/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/2026-07-28/learn/architecture">
<Card title="Security" icon="lock" href="/docs/2026-07-28/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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docs/2025-11-25/getting-started/intro
<Card title="Understand concepts" icon="book" href="/docs/2025-11-25/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/2025-11-25/learn/architecture">
<Card title="Security" icon="lock" href="/docs/2025-11-25/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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docs/2025-06-18/getting-started/intro
<Card title="Understand concepts" icon="book" href="/docs/2025-06-18/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/2025-06-18/learn/architecture">
<Card title="Security" icon="lock" href="/docs/2025-06-18/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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mcp
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docs/2025-03-26/getting-started/intro
<Card title="Understand concepts" icon="book" href="/docs/2025-03-26/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/2025-03-26/learn/architecture">
<Card title="Security" icon="lock" href="/docs/2025-03-26/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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Upstream edited 23 Sep 2026 16:35 UTC Recorded here 23 Sep 2026 16:37 UTC
mcp
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docs/2024-11-05/getting-started/intro
<Card title="Understand concepts" icon="book" href="/docs/2024-11-05/learn/architecture">
<Card title="Architecture" icon="book" href="/docs/2024-11-05/learn/architecture">
<Card title="Security" icon="lock" href="/docs/2024-11-05/tutorials/security/security_best_practices">
Understand the security considerations and best practices for MCP
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22 Sep 2026
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community/working-groups/infrastructure
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community/working-groups/infrastructure
| Role | Name | Organization | GitHub | Term |
| ---- | ----------------------- | ------------ | ---------------------------------------------------------------------- | ------- |
| Lead | David Soria Parra (DSP) | Anthropic | [@dsp](https://github.com/dsp), [@dsp-ant](https://github.com/dsp-ant) | Initial |
| Lead | Den Delimarsky | Anthropic | [@localden](https://github.com/localden) | Initial |
| Lead | Sambhav Kothari | Bloomberg | [@sambhav](https://github.com/sambhav) | Initial |
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community/contributing
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community/contributing
<Note>
These commands work the same on macOS, Linux, and Windows, so you're good to
go on any platform.
</Note>
> [!NOTE]
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community/contributing
| Repository | Contents |
| ----------------------------------------------------------------------------------------------------------- | ------------------------- |
| Repository | Contents |
| - | - |
| [`modelcontextprotocol/typescript-sdk`](https://github.com/modelcontextprotocol/typescript-sdk) | TypeScript/JavaScript SDK |
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community/contributing
### Join the Community
You don't need to have a change ready to get involved. Join the
[MCP Contributor Discord](https://discord.gg/6CSzBmMkjX) to connect with contributors and
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mcp
seps/1330-elicitation-enum-schema-improvements-and-standards
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seps/1330-elicitation-enum-schema-improvements-and-standards
<div className="flex items-center gap-2 mb-4">
<Badge color="green" shape="pill">
Final
</Badge>
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seps/1330-elicitation-enum-schema-improvements-and-standards
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seps/1330-elicitation-enum-schema-improvements-and-standards
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 1330 |
| **Title** | Elicitation Enum Schema Improvements and Standards Compliance |
| **Status** | Final |
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specification/draft/server/resources
Serves that support neither `listChanged` or `subscribe` may omit it:
Servers that support neither `listChanged` nor `subscribe` may omit it:
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specification/2026-07-28/server/resources
Serves that support neither `listChanged` or `subscribe` may omit it:
Servers that support neither `listChanged` nor `subscribe` may omit it:
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specification/2025-06-18/server/tools
"mimeType": "image/png"
"mimeType": "image/png",
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seps/1330-elicitation-enum-schema-improvements-and-standards
“enumNames”: ["Red", "Green", "Blue"],
"default": "Green"
"enumNames": ["Red", "Green", "Blue"],
"default": "#00FF00"
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community/interest-groups/financial-services
| Role | Name | Organization | GitHub | Term |
| ----------- | ------------------------ | ------------ | -------------------------------------- | ------- |
| Facilitator | Sambhav Kothari | Bloomberg | [@sambhav](https://github.com/sambhav) | Initial |
| Facilitator | Peder Holdgaard Pedersen | Saxo Bank | [@PederHP](https://github.com/PederHP) | Initial |
| Role | Name | Organization | GitHub | Term |
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community/interest-groups/financial-services
Discord: [#financial-services-ig](https://discord.gg/NzkBHsrGf)
Discord: [#financial-services-ig](https://discord.gg/6CSzBmMkjX)
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specification/draft/basic/authorization/client-registration
"http://localhost:3000/callback"
"http://[::1]:3000/callback"
Client->>Server: Authorization Request<br/>client_id=https://app.example.com/oauth/metadata.json<br/>redirect_uri=http://localhost:3000/callback
Client->>Server: Authorization Request<br/>client_id=https://app.example.com/oauth/metadata.json<br/>redirect_uri=http://127.0.0.1:3000/callback
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community/working-groups/skills-over-mcp
| Role | Name | Organization | GitHub | Term |
| ---- | --------------- | --------------------------- | ---------------------------------------- | ------- |
| Lead | Ola Hungerford | Nordstrom / MCP Maintainer | [@olaservo](https://github.com/olaservo) | Initial |
| Lead | Peter Alexander | Anthropic / Core Maintainer | [@pja-ant](https://github.com/pja-ant) | Initial |
| Lead | Sambhav Kothari | Bloomberg / MCP Maintainer | [@sambhav](https://github.com/sambhav) | Initial |
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community/working-groups/skills-over-mcp
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community/working-groups/skills-over-mcp
| Nate Barbettini | Arcade.dev | [@nbarbettini](https://github.com/nbarbettini) | | Participant |
| 2026-09-15 | Added @nbarbettini (Arcade.dev) as Participant
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18 Sep 2026
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extensions/skills/overview
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extensions/skills/overview
contains the specification for Skills over MCP.
contains the published specification for the official Skills extension
(`io.modelcontextprotocol/skills`). [SEP-2640](/seps/2640-skills-extension) is Final.
The [Skills Over MCP Working Group](/community/working-groups/skills-over-mcp)
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mcp
community/working-groups/skills-over-mcp
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community/working-groups/skills-over-mcp
registry schema, SDK implementations, and client behavior. The WG's current direction
is captured in [SEP-2640 — Skills Extension](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640)
(Resources-based, Extensions Track).
registry schema, SDK implementations, and client behavior.
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community/working-groups/filesystems
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community/working-groups/filesystems
* **Skills Over MCP WG.** Filesystem dependency, including questions about write access, was an agenda item at the
office hours of 24 March 2026 and remains open.
* **[Skills Over MCP WG](/community/working-groups/skills-over-mcp).** The published
[Skills extension](/extensions/skills/overview) uses Resources for file reads and defines optional directory reading.
It does not depend on filesystem write operations; coordinate on future resource operations that affect skills.
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community/interest-groups/primitive-grouping
* **[Skills Over MCP WG](/community/working-groups/skills-over-mcp)** - the MCP-and-Skills effort is evaluating how capabilities are discovered and organized, which overlaps with g
* **[Skills Over MCP WG](/community/working-groups/skills-over-mcp)** - maintains the published [Skills extension](/extensions/skills/overview); skill discovery and progressive dis
* **Organizing MCP servers** - the MCP Registry and MCP-and-Skills groups are evaluating how different servers should be organized to improve the client experience
* **Organizing MCP servers** - server discovery and registry schema decisions belong to the [Registry WG](/community/working-groups/registry), with skill-distribution requirements
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extensions/skills/overview
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extensions/skills/overview
<Card title="modelcontextprotocol/ext-skills" icon="github" href="https://github.com/modelcontextprotocol/ext-skills">
Specification and documentation for Skills over MCP.
</Card>
> **[modelcontextprotocol/ext-skills](https://github.com/modelcontextprotocol/ext-skills)**
>
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extensions/skills/overview
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extensions/skills/overview
| Field | Meaning |
| ------------- | --------------------------------------------------------------------------- |
| `uri` | The resource URI of the skill's `SKILL.md`. |
| Field | Meaning |
| - | - |
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community/working-groups/filesystems
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community/working-groups/filesystems
| Role | Name | Organization | GitHub | Term |
| ---- | --------------- | ------------ | ---------------------------------------------------- | ------- |
| Lead | Sambhav Kothari | Bloomberg | [@sambhav](https://github.com/sambhav) | Initial |
| Lead | Ola Hungerford | Nordstrom | [@olaservo](https://github.com/olaservo) | Initial |
| Lead | Daniel Temesgen | Bloomberg | [@DanielTemesgen](https://github.com/DanielTemesgen) | Initial |
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community/interest-groups/primitive-grouping
| Role | Name | Organization | GitHub | Term |
| ----------- | ----------- | ------------------------ | ---------------------------------------------------- | ------- |
| Facilitator | Tapan Chugh | University of Washington | [@chughtapan](https://github.com/chughtapan) | Initial |
| Facilitator | Sam Morrow | GitHub | [@SamMorrowDrums](https://github.com/SamMorrowDrums) | Initial |
| Role | Name | Organization | GitHub | Term |
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mcp
seps/2640-skills-extension
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seps/2640-skills-extension
* **Fragmented distribution.** A server and the skill that teaches an agent to use it are versioned, discovered, and installed separately. Users installing a server from a registry
* **Instruction size limits.** Server instructions are delivered as the `instructions` field of the `server/discover` result and are practically bounded in size. Complex workflows,
* **Fragmented distribution.** A server and the skill that teaches an agent to use it are versioned, discovered, and installed separately. Users installing a server from a registry
* **Instruction size limits.** Server instructions are delivered as the `instructions` field of the `server/discover` result and are practically bounded in size. Complex workflows,
Existing implementations using other `skill://` URI structures will need to adjust to conform. See the Working Group's [related-work survey](https://github.com/modelcontextprotocol
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seps/2640-skills-extension
| Field | Value
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------
| **SEP** | 2640
| **Title** | Skills Extension
| **Status** | Final
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community/working-groups/skills-over-mcp
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community/working-groups/skills-over-mcp
| Lead | Sambhav Kothari | Bloomberg / MCP Maintainer | [@sambhav](https://github.com/sambhav) | Initial |
| Sambhav Kothari | Bloomberg / MCP Maintainer | [@sambhav](https://github.com/sambhav) | | Lead |
| Sambhav Kothari | Bloomberg / MCP Maintainer | [@sambhav](https://github.com/sambhav) | | Participant |
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Recorded here 14 Sep 2026 22:37 UTC
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mcp
seps/index
±changed
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seps/index
* **Final**: 41
* **Final**: 42
| [SEP-2640](/seps/2640-skills-extension) | Skills Extension | <Badge colo
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Recorded here 13 Sep 2026 21:37 UTC
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seps/2640-skills-extension
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extensions/overview
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extensions/overview
### Skills over MCP
<Card title="modelcontextprotocol/ext-skills" icon="github" href="https://github.com/modelcontextprotocol/ext-skills">
Discover and read Agent Skills from MCP servers.
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extensions/client-matrix
| 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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Recorded here 13 Sep 2026 21:37 UTC
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extensions/overview
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extensions/overview
<Tip>
If you're building a third-party extension, use a reversed domain name you own as the vendor prefix to avoid collisions (similar to Java package naming). For example, a company o
</Tip>
> [!TIP]
>
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mcp
extensions/overview
±changed
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extensions/overview
| Extension | Description |
| ------------------------------------------------------------------------------------- | --------------------------------------------------------------------------- |
| [OAuth Client Credentials](/extensions/auth/oauth-client-credentials) | OAuth 2.0 client credentials flow for machine-to-machine authentication. |
| Extension | Description |
| - | - |
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extensions/apps/overview
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extensions/apps/overview
<Frame caption="Excalidraw MCP App, running in Claude">
<img src="https://mintcdn.com/mcp/jbEkS7m9mV8aY_kB/images/apps/excalidraw.gif?s=c783b088f3c687e4dd4cf05c0d20f325" alt="An Excalidraw MCP App drawing a sequence diagram inside a C
</Frame>
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extensions/apps/overview
<Tip>
For comprehensive API documentation, advanced patterns, and the full specification, visit the [official MCP Apps documentation](https://apps.extensions.modelcontextprotocol.io).
</Tip>
> [!TIP]
>
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seps/2549-TTL-for-list-results
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seps/2549-TTL-for-list-results
A misconfigured or malicious serer could set an excessively long TTL, causing clients to cache stale data for longer than desired. However, since the TTL is a hint and clients can
A misconfigured or malicious server could set an excessively long TTL, causing clients to cache stale data for longer than desired. However, since the TTL is a hint and clients can
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seps/2549-TTL-for-list-results
<div className="flex items-center gap-2 mb-4">
<Badge color="green" shape="pill">
Final
</Badge>
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seps/2549-TTL-for-list-results
| Field | Value |
| ------------- | ------------------------------------------------------------------------------- |
| **SEP** | 2549 |
| **Title** | TTL for List Results |
| **Status** | Final |
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registry/package-types
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registry/package-types
## Cargo (Rust) Packages
For Cargo packages, the MCP Registry currently supports the official crates.io registry (`https://crates.io`) only.
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community/interest-groups/enterprise
| Role | Name | Organization | GitHub | Term |
| ----------- | ------------- | ---------------- | ---------------------------------------------------------- | -------- |
| Facilitator | Raghu Chandra | Independent | [@raghu-chandra-mcp](https://github.com/raghu-chandra-mcp) | 6 months |
| Facilitator | Yannj\_Fr | MCPApps Builders | [@yannj-fr](https://github.com/yannj-fr) | 6 months |
| Role | Name | Organization | GitHub | Term |
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Nothing on this page matches that. Press Enter to search every page of the ledger.