Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
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.
