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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248 27 Aug 2026

OAuth discovery schema accepts client-ID metadata documents

Under the hood

Useful2 Signal2

MCP

MCP OAuth discovery now accepts providers advertising client-ID metadata documents.

What

The schema for an OpenID provider's discovery document is now written out in full and accepts an optional client_id_metadata_document_supported boolean, which matters for MCP servers authenticating over OAuth.

Details

Required fields are response_types_supported, subject_types_supported and id_token_signing_alg_values_supported, alongside the issuer, endpoints and the various *_supported arrays.

Evidence

client_id_metadata_document_supported

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.248 →