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HomeDocsModel Context Protocol 30 Oct 2026
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SEP-2133: Extensions changedseps/2133-extensions

Nearest release: v2.1.314, published 7 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 30 Oct 2026 08:04 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 30 Oct 2026 08:07 UTC.

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6363* A repository has a set of maintainers (identified by MAINTAINERS.md) appointed by the core maintainers that are responsible for the repository and extensions within it (e.g. [ext-auth MAINTAINERS.md](https://github.com/modelcontextprotocol/ext-auth/blob/main/MAINTAINERS.md), [ext-apps MAINTAINERS.md](https://github.com/modelcontextprotocol/ext-apps/blob/main/MAINTAINERS.md)).
6464* Extensions SHOULD have an associated working group or interest group to guide their development and gather community input.
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66An *extension* is a versioned specification document within an extension repository, e.g. [https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx)
66An *extension* is a versioned specification document within an extension repository, e.g. [https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/stable/oauth-client-credentials/2026-07-28/oauth-client-credentials.mdx](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/stable/oauth-client-credentials/2026-07-28/oauth-client-credentials.mdx)
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6868* Extension specifications MUST use the same language as the core specification (i.e. \[[BCP 14](https://www.rfc-editor.org/info/bcp14)] \[[RFC2119](https://datatracker.ietf.org/doc/html/rfc2119)] \[[RFC8174](https://datatracker.ietf.org/doc/html/rfc8174)]) and SHOULD be worded as if they were part of the core specification.
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