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
820pages tracked
773 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
147 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
77 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
20 Oct 2026
432 pages
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mcp
specification/2025-06-18/basic/lifecycle
±changed
+16−16
mcpchanged
specification/2025-06-18/basic/lifecycle
[pings](/specification/2025-06-18/basic/utilities/ping) before the server has responded to the
[pings](/specification/2025-06-18/basic/utilities/ping.md) before the server has responded to the
[pings](/specification/2025-06-18/basic/utilities/ping) and
[logging](/specification/2025-06-18/server/utilities/logging) before receiving the `initialized`
[pings](/specification/2025-06-18/basic/utilities/ping.md) and
+16 −16 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
specification/2025-06-18/basic/authorization
±changed
+4−4
mcpchanged
specification/2025-06-18/basic/authorization
The [Security Best Practices document](/specification/2025-06-18/basic/security_best_practices#token-passthrough)
The [Security Best Practices document](/specification/2025-06-18/basic/security_best_practices.md#token-passthrough)
Attackers can exploit MCP servers acting as intermediaries to third-party APIs, leading to [confused deputy vulnerabilities](/specification/2025-06-18/basic/security_best_practices
Attackers can exploit MCP servers acting as intermediaries to third-party APIs, leading to [confused deputy vulnerabilities](/specification/2025-06-18/basic/security_best_practices
2. **Token passthrough.** If the MCP server not only accepts tokens with incorrect audiences but also forwards these unmodified tokens to downstream services, it can potentially ca
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mcp
specification/2025-03-26/server/tools
±changed
+2−2
mcpchanged
specification/2025-03-26/server/tools
[pagination](/specification/2025-03-26/server/utilities/pagination).
[pagination](/specification/2025-03-26/server/utilities/pagination.md).
[Resources](/specification/2025-03-26/server/resources) **MAY** be embedded, to provide additional context
[Resources](/specification/2025-03-26/server/resources.md) **MAY** be embedded, to provide additional context
+2 −2 lines
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mcp
specification/2025-03-26/server/resources
±changed
+3−3
mcpchanged
specification/2025-03-26/server/resources
supports [pagination](/specification/2025-03-26/server/utilities/pagination).
supports [pagination](/specification/2025-03-26/server/utilities/pagination.md).
auto-completed through [the completion API](/specification/2025-03-26/server/utilities/completion).
This operation supports [pagination](/specification/2025-03-26/server/utilities/pagination).
auto-completed through [the completion API](/specification/2025-03-26/server/utilities/completion.md).
+3 −3 lines
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mcp
specification/2025-03-26/server/prompts
±changed
+3−3
mcpchanged
specification/2025-03-26/server/prompts
[initialization](/specification/2025-03-26/basic/lifecycle#initialization):
[initialization](/specification/2025-03-26/basic/lifecycle.md#initialization):
supports [pagination](/specification/2025-03-26/server/utilities/pagination).
supports [pagination](/specification/2025-03-26/server/utilities/pagination.md).
auto-completed through [the completion API](/specification/2025-03-26/server/utilities/completion).
+3 −3 lines
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mcp
specification/2025-03-26/client/sampling
±changed
+1−1
mcpchanged
specification/2025-03-26/client/sampling
[initialization](/specification/2025-03-26/basic/lifecycle#initialization):
[initialization](/specification/2025-03-26/basic/lifecycle.md#initialization):
+1 −1 lines
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mcp
specification/2025-03-26/client/roots
±changed
+1−1
mcpchanged
specification/2025-03-26/client/roots
[initialization](/specification/2025-03-26/basic/lifecycle#initialization):
[initialization](/specification/2025-03-26/basic/lifecycle.md#initialization):
+1 −1 lines
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mcp
specification/2025-03-26/changelog
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mcpchanged
specification/2025-03-26/changelog
the previous revision, [2024-11-05](/specification/2024-11-05).
the previous revision, [2024-11-05](/specification/2024-11-05.md).
1. Added a comprehensive **[authorization framework](/specification/2025-03-26/basic/authorization)**
1. Added a comprehensive **[authorization framework](/specification/2025-03-26/basic/authorization.md)**
transport](/specification/2025-03-26/basic/transports#streamable-http)** (PR
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mcp
specification/2025-03-26/basic/transports
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+3−3
mcpchanged
specification/2025-03-26/basic/transports
> transport](/specification/2024-11-05/basic/transports#http-with-sse) from
> transport](/specification/2024-11-05/basic/transports.md#http-with-sse) from
server, beginning with the [initialization phase](/specification/2025-03-26/basic/lifecycle). To support
server, beginning with the [initialization phase](/specification/2025-03-26/basic/lifecycle.md). To support
transport](/specification/2024-11-05/basic/transports#http-with-sse) (from
+3 −3 lines
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mcp
specification/2025-03-26/basic/lifecycle
±changed
+14−14
mcpchanged
specification/2025-03-26/basic/lifecycle
[pings](/specification/2025-03-26/basic/utilities/ping) before the server has responded to the
[pings](/specification/2025-03-26/basic/utilities/ping.md) before the server has responded to the
[pings](/specification/2025-03-26/basic/utilities/ping) and
[logging](/specification/2025-03-26/server/utilities/logging) before receiving the `initialized`
[pings](/specification/2025-03-26/basic/utilities/ping.md) and
+14 −14 lines
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mcp
specification/2024-11-05/server/tools
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+2−2
mcpchanged
specification/2024-11-05/server/tools
[pagination](/specification/2024-11-05/server/utilities/pagination).
[pagination](/specification/2024-11-05/server/utilities/pagination.md).
[Resources](/specification/2024-11-05/server/resources) **MAY** be
[Resources](/specification/2024-11-05/server/resources.md) **MAY** be
+2 −2 lines
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mcp
specification/2024-11-05/server/resources
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+3−3
mcpchanged
specification/2024-11-05/server/resources
[pagination](/specification/2024-11-05/server/utilities/pagination).
[pagination](/specification/2024-11-05/server/utilities/pagination.md).
auto-completed through [the completion API](/specification/2024-11-05/server/utilities/completion).
auto-completed through [the completion API](/specification/2024-11-05/server/utilities/completion.md).
[pagination](/specification/2024-11-05/server/utilities/pagination).
+3 −3 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
specification/2024-11-05/server/prompts
±changed
+3−3
mcpchanged
specification/2024-11-05/server/prompts
[initialization](/specification/2024-11-05/basic/lifecycle#initialization):
[initialization](/specification/2024-11-05/basic/lifecycle.md#initialization):
[pagination](/specification/2024-11-05/server/utilities/pagination).
[pagination](/specification/2024-11-05/server/utilities/pagination.md).
auto-completed through [the completion API](/specification/2024-11-05/server/utilities/completion).
+3 −3 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
specification/2024-11-05/client/sampling
±changed
+1−1
mcpchanged
specification/2024-11-05/client/sampling
[initialization](/specification/2024-11-05/basic/lifecycle#initialization):
[initialization](/specification/2024-11-05/basic/lifecycle.md#initialization):
+1 −1 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
specification/2024-11-05/client/roots
±changed
+1−1
mcpchanged
specification/2024-11-05/client/roots
[initialization](/specification/2024-11-05/basic/lifecycle#initialization):
[initialization](/specification/2024-11-05/basic/lifecycle.md#initialization):
+1 −1 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
specification/2024-11-05/basic/lifecycle
±changed
+11−11
mcpchanged
specification/2024-11-05/basic/lifecycle
[pings](/specification/2024-11-05/basic/utilities/ping) before the server
[pings](/specification/2024-11-05/basic/utilities/ping.md) before the server
[pings](/specification/2024-11-05/basic/utilities/ping) and
[logging](/specification/2024-11-05/server/utilities/logging) before
[pings](/specification/2024-11-05/basic/utilities/ping.md) and
+11 −11 lines
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mcp
registry/remote-servers
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+1−1
mcpchanged
registry/remote-servers
Remote servers should use the Streamable HTTP transport. The SSE transport is [deprecated](/specification/draft/deprecated), so publish an `"sse"` remote only to support existing c
Remote servers should use the Streamable HTTP transport. The SSE transport is [deprecated](/specification/draft/deprecated.md), so publish an `"sse"` remote only to support existin
+1 −1 lines
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mcp
registry/registry-aggregators
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+1−1
mcpchanged
registry/registry-aggregators
The `"deleted"` status typically indicates that a server has violated our permissive [moderation policy](./moderation-policy), suggesting the server might be spam, malware, or ille
The `"deleted"` status typically indicates that a server has violated our permissive [moderation policy](/registry/moderation-policy.md), suggesting the server might be spam, malwa
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mcp
registry/quickstart
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+5−5
mcpchanged
registry/quickstart
* **GitHub account** — The MCP Registry supports [multiple authentication methods](./authentication). For simplicity, this tutorial will use GitHub-based authentication, so you wil
* **GitHub account** — The MCP Registry supports [multiple authentication methods](/registry/authentication.md). For simplicity, this tutorial will use GitHub-based authentication,
* Learn about [support for other package types](./package-types).
* Learn about [support for remote servers](./remote-servers).
* Learn how to [use other authentication methods](./authentication), such as [DNS authentication](./authentication#dns-authentication) which enables custom domains for server name
+5 −5 lines
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mcp
registry/github-actions
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+1−1
mcpchanged
registry/github-actions
| "Package validation failed" | Verify your package successfully published to the package registry (e.g., npm, PyPI), and that your package has the [necessary verification informat
| "Package validation failed" | Verify your package successfully published to the package registry (e.g., npm, PyPI), and that your package has the [necessary verification informat
+1 −1 lines
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mcp
registry/about
±changed
+4−4
mcpchanged
registry/about
The [Package Types guide](./package-types) lists the supported package types and registries. More package registries may be supported in the future based on community demand. If yo
The [Package Types guide](/registry/package-types.md) lists the supported package types and registries. More package registries may be supported in the future based on community de
We expect that downstream aggregators will use the MCP Registry API to pull new metadata on a regular but infrequent basis (for example, once per hour). See the [MCP Registry Aggre
We expect that downstream aggregators will use the MCP Registry API to pull new metadata on a regular but infrequent basis (for example, once per hour). See the [MCP Registry Aggre
This namespace system ensures that only the legitimate owner of a GitHub account or domain can publish servers under that namespace, providing trust and accountability in the ecosy
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mcp
docs/draft/learn/versioning
±changed
+5−5
mcpchanged
docs/draft/learn/versioning
The **current** protocol version is [**2026-07-28**](/specification/2026-07-28/).
The **current** protocol version is [**2026-07-28**](/specification/2026-07-28.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
+5 −5 lines
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mcp
docs/draft/learn/client-concepts
±changed
+7−7
mcpchanged
docs/draft/learn/client-concepts
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](/speci
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](/speci
Elicitation follows the [Multi Round-Trip Requests](/specification/draft/basic/patterns/mrtr) (MRTR) pattern. When a server needs user input while processing a request such as `too
Elicitation follows the [Multi Round-Trip Requests](/specification/draft/basic/patterns/mrtr.md) (MRTR) pattern. When a server needs user input while processing a request such as `
> Roots are [deprecated](/specification/draft/deprecated) as of protocol version
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mcp
docs/draft/learn/architecture
±changed
+13−13
mcpchanged
docs/draft/learn/architecture
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/draft/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/draft/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/draft/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
+13 −13 lines
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mcp
docs/draft/getting-started/intro
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+6−6
mcpchanged
docs/draft/getting-started/intro
> **[Build servers](/docs/draft/develop/build-server)**
> **[Build servers](/docs/draft/develop/build-server.md)**
> **[Build clients](/docs/draft/develop/build-client)**
> **[Build clients](/docs/draft/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
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Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2026-07-28/learn/versioning
±changed
+5−5
mcpchanged
docs/2026-07-28/learn/versioning
The **current** protocol version is [**2026-07-28**](/specification/2026-07-28/).
The **current** protocol version is [**2026-07-28**](/specification/2026-07-28.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
+5 −5 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2026-07-28/learn/client-concepts
±changed
+7−7
mcpchanged
docs/2026-07-28/learn/client-concepts
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](/speci
| **Roots** | Roots allow clients to specify which directories servers should focus on, communicating intended scope through a coordination mechanism. Roots are [deprecated](/speci
Elicitation follows the [Multi Round-Trip Requests](/specification/2026-07-28/basic/patterns/mrtr) (MRTR) pattern. When a server needs user input while processing a request such as
Elicitation follows the [Multi Round-Trip Requests](/specification/2026-07-28/basic/patterns/mrtr.md) (MRTR) pattern. When a server needs user input while processing a request such
> Roots are [deprecated](/specification/2026-07-28/deprecated) as of protocol
+7 −7 lines
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mcp
docs/2026-07-28/learn/architecture
±changed
+13−13
mcpchanged
docs/2026-07-28/learn/architecture
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2026-07-28/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2026-07-28/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/2026-07-28/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
+13 −13 lines
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mcp
docs/2026-07-28/getting-started/intro
±changed
+6−6
mcpchanged
docs/2026-07-28/getting-started/intro
> **[Build servers](/docs/2026-07-28/develop/build-server)**
> **[Build servers](/docs/2026-07-28/develop/build-server.md)**
> **[Build clients](/docs/2026-07-28/develop/build-client)**
> **[Build clients](/docs/2026-07-28/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
+6 −6 lines
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mcp
docs/2025-11-25/learn/versioning
±changed
+4−4
mcpchanged
docs/2025-11-25/learn/versioning
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25/).
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
+4 −4 lines
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mcp
docs/2025-11-25/learn/architecture
±changed
+6−6
mcpchanged
docs/2025-11-25/learn/architecture
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-11-25/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-11-25/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/2025-11-25/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
+6 −6 lines
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mcp
docs/2025-11-25/getting-started/intro
±changed
+6−6
mcpchanged
docs/2025-11-25/getting-started/intro
> **[Build servers](/docs/2025-11-25/develop/build-server)**
> **[Build servers](/docs/2025-11-25/develop/build-server.md)**
> **[Build clients](/docs/2025-11-25/develop/build-client)**
> **[Build clients](/docs/2025-11-25/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
+6 −6 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2025-06-18/learn/versioning
±changed
+4−4
mcpchanged
docs/2025-06-18/learn/versioning
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25/).
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
+4 −4 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2025-06-18/learn/architecture
±changed
+6−6
mcpchanged
docs/2025-06-18/learn/architecture
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-06-18/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-06-18/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/2025-06-18/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
+6 −6 lines
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mcp
docs/2025-06-18/getting-started/intro
±changed
+6−6
mcpchanged
docs/2025-06-18/getting-started/intro
> **[Build servers](/docs/2025-06-18/develop/build-server)**
> **[Build servers](/docs/2025-06-18/develop/build-server.md)**
> **[Build clients](/docs/2025-06-18/develop/build-client)**
> **[Build clients](/docs/2025-06-18/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
+6 −6 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2025-03-26/learn/versioning
±changed
+4−4
mcpchanged
docs/2025-03-26/learn/versioning
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25/).
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
+4 −4 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2025-03-26/learn/architecture
±changed
+6−6
mcpchanged
docs/2025-03-26/learn/architecture
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-03-26/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2025-03-26/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/2025-03-26/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
+6 −6 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2025-03-26/getting-started/intro
±changed
+6−6
mcpchanged
docs/2025-03-26/getting-started/intro
> **[Build servers](/docs/2025-03-26/develop/build-server)**
> **[Build servers](/docs/2025-03-26/develop/build-server.md)**
> **[Build clients](/docs/2025-03-26/develop/build-client)**
> **[Build clients](/docs/2025-03-26/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
+6 −6 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 22 Oct 2026 20:37 UTC
mcp
docs/2024-11-05/learn/versioning
±changed
+4−4
mcpchanged
docs/2024-11-05/learn/versioning
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25/).
The **current** protocol version is [**2025-11-25**](/specification/2025-11-25.md).
[feature lifecycle and deprecation policy](/community/feature-lifecycle):
[feature lifecycle and deprecation policy](/community/feature-lifecycle.md):
[expedited-removal exception](/community/feature-lifecycle#expedited-removal),
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For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2024-11-05/sdk).
For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/2024-11-05/sdk.md).
* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/2024-11-05/sdk): SDKs for different programming languages that implement MCP.
* [MCP Specification](https://modelcontextprotocol.io/specification/latest.md): A specification of MCP that outlines the implementation requirements for clients and servers.
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> **[Build servers](/docs/2024-11-05/develop/build-server)**
> **[Build servers](/docs/2024-11-05/develop/build-server.md)**
> **[Build clients](/docs/2024-11-05/develop/build-client)**
> **[Build clients](/docs/2024-11-05/develop/build-client.md)**
> **[Build MCP Apps](/extensions/apps/overview)**
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This page outlines the Core Maintainers' vision for the protocol over the coming six to twelve months, highlighting objectives targeted for the next specification update and beyond
This page outlines the Core Maintainers' vision for the protocol over the coming six to twelve months, highlighting objectives targeted for the next specification update and beyond
**[Specification Enhancement Proposals](/community/sep-guidelines) (SEPs) that fall within the priority areas below get expedited review and have the best chance of acceptance.** S
**[Specification Enhancement Proposals](/community/sep-guidelines.md) (SEPs) that fall within the priority areas below get expedited review and have the best chance of acceptance.*
If you're considering writing a SEP, start by identifying which priority area it belongs to and raising it with the relevant Working Group, then bring that group's support with the
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[transport overview](/specification/draft/basic/transports) defines the boundary
[transport overview](/specification/draft/basic/transports.md) defines the boundary
* **[SDK WG](/community/working-groups/sdk)**: Official SDKs implement transport
* **[SDK WG](/community/working-groups/sdk.md)**: Official SDKs implement transport
* **[Tasks and Events WG](/community/working-groups/tasks-events)**: The Tasks and
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* **[Transports WG](/community/working-groups/transports)** — delivery and ordering guarantees depend on transport capabilities; callback semantics must be coherent across stdio, S
* **[Agents IG](/community/interest-groups/agents)** — agent-as-tool, remote-agent, and supervisor/sub-agent patterns depend on Tasks and on task completion notifications. The IG p
* **[Transports WG](/community/working-groups/transports.md)** — delivery and ordering guarantees depend on transport capabilities; callback semantics must be coherent across stdio
* **[Agents IG](/community/interest-groups/agents.md)** — agent-as-tool, remote-agent, and supervisor/sub-agent patterns depend on Tasks and on task completion notifications. The I
[SEP-2663: Tasks Extension](/seps/2663-tasks-extension)
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[SEP-2640 — Skills Extension](/seps/2640-skills-extension) is Final. The WG maintains
the official [Skills extension](/extensions/skills/overview)
[SEP-2640 — Skills Extension](/seps/2640-skills-extension.md) is Final. The WG maintains
the official [Skills extension](/extensions/skills/overview.md)
[Progressive Disclosure WG](/community/working-groups/progressive-disclosure) (progressive disclosure patterns), and external projects including
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* **[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.
* **[Skills Over MCP WG](/community/working-groups/skills-over-mcp.md).** The published
[Skills extension](/extensions/skills/overview.md) uses Resources for file reads and defines optional directory reading.
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[Authorization IG](/community/interest-groups/auth)
[Authorization IG](/community/interest-groups/auth.md)
* **[Tasks and Events WG](/community/working-groups/tasks-events)**: Tasks are the foundation for the long-running
* **[Tasks and Events WG](/community/working-groups/tasks-events.md)**: Tasks are the foundation for the long-running
* **[Interceptors WG](/community/working-groups/interceptors)**: interceptors are a potential
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The Authorization Interest Group is the single chartered venue for MCP authorization work. It brings MCP implementers, identity-provider vendors, and security practitioners togethe
The Authorization Interest Group is the single chartered venue for MCP authorization work. It brings MCP implementers, identity-provider vendors, and security practitioners togethe
* **Extension interoperability reports**: results of pairing independent implementations of the [ext-auth](https://github.com/modelcontextprotocol/ext-auth) extensions end to end (
* **Extension interoperability reports**: results of pairing independent implementations of the [ext-auth](https://github.com/modelcontextprotocol/ext-auth) extensions end to end (
* **SEP and draft feedback**: authorization-related SEPs, ext-auth drafts, reference implementations, and demos are presented on the call and in `#auth-ig` threads for feedback bef
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* **[Transports WG](/community/working-groups/transports)** -
* **[Transports WG](/community/working-groups/transports.md)** -
* **[Tasks and Events WG](/community/working-groups/tasks-events)** -
* **[Tasks and Events WG](/community/working-groups/tasks-events.md)** -
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<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
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<Warning>
**Deprecated**: The Logging feature is deprecated as of protocol version
`2026-07-28`
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<Note>
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metadata (`io.modelcontextprotocol/protocolVersion`,
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* The <b>Time-to-live (TTL) Field</b>,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
* The <b>Cache Scope Field</b>,`cacheScope`, indicates the intended scope of the cached response, either `"public"` or `"private"`.
* The **Time-to-live (TTL) Field**,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
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<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
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<Note>
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<Note>
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<Note>
`serverInfo` is self-reported by the server and is not verified by the
protocol. It is intended for display, logging, and debugging. Clients **SHOULD
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<Warning>
**Deprecated**: The Sampling feature is deprecated as of protocol version
`2026-07-28`
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<Warning>
**Deprecated**: The Roots feature is deprecated as of protocol version
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<Warning>
For trust & safety and security:
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<Info>
Streamable HTTP was introduced in protocol version 2025-03-26 as a replacement
for the [HTTP+SSE transport][http-sse] from protocol version 2024-11-05.
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<Note>
Multi Round-Trip Requests (MRTR) was introduced in this version of the MCP
specification. This replaces the previous approach of sending server-initiated
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<Warning>
Dynamic Client Registration is deprecated. New implementations should use
[Client ID Metadata Documents](#client-id-metadata-documents) instead. This
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<Note>
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* The <b>Time-to-live (TTL) Field</b>,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
* The <b>Cache Scope Field</b>,`cacheScope`, indicates the intended scope of the cached response, either `"public"` or `"private"`.
* The **Time-to-live (TTL) Field**,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
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<Note>
`serverInfo` is self-reported by the server and is not verified by the
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<Warning>
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<Info>
Streamable HTTP was introduced in protocol version 2025-03-26 as a replacement
for the [HTTP+SSE transport][http-sse] from protocol version 2024-11-05.
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<Warning>
Dynamic Client Registration is deprecated. New implementations should use
[Client ID Metadata Documents](#client-id-metadata-documents) instead. This
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<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny tool invocations.
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specification/2025-11-25/server/resources
<div id="enable-section-numbers" />
<img src="https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/resource-picker.png?fit=max&auto=format&n=uzELntid9uQ-QMAr&q=85&s=bc7bc3db17d447a69809689e5888a3a
![Example of resource context picker](https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/resource-picker.png?fit=max\&auto=format\&n=uzELntid9uQ-QMAr\&q=85\&s
+1 −3 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-11-25/server/prompts
±changed
+6−8
mcpchanged
specification/2025-11-25/server/prompts
<div id="enable-section-numbers" />
<img src="https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/slash-command.png?fit=max&auto=format&n=uzELntid9uQ-QMAr&q=85&s=965e4fa2273b376721d6f26c396c69c5"
![Example of prompt exposed as slash command](https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/slash-command.png?fit=max\&auto=format\&n=uzELntid9uQ-QMAr\&q
<Note>
+6 −8 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
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