Changelog changedspecification/draft/changelog
Nearest release: v2.1.321, published 16 hours after 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 9 Nov 2026 03:02 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 9 Nov 2026 03:07 UTC.
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## Minor changes
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33Changes since the most recent release will accumulate here.
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5## Minor changes
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71. Update the referenced version of [OAuth Client ID Metadata Document](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-client-id-metadata-document-03) from `draft-ietf-oauth-client-id-metadata-document-00` to `draft-ietf-oauth-client-id-metadata-document-03`. MCP implementations that support Client ID Metadata Documents **MUST** follow this version.
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59## Other schema changes
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7111. Restore the optional `_meta` field on `CreateMessageRequestParams`, `ElicitRequestFormParams`, `ElicitRequestURLParams`, `ElicitResult`, and `ListRootsResult`. It was unintentionally dropped in 2026-07-28 when these types stopped extending `TaskAugmentedRequestParams` and `Result`, leaving `ListRootsRequest` as the only input request that could carry `_meta` ([#3468](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/3468)).
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