Spec PR #3002 (part of the final 2026-07-28 revision) moved serverInfo from
the DiscoverResult body to _meta['io.modelcontextprotocol/serverInfo'] and
demoted the request envelope's clientInfo from required to SHOULD. The
checks still asserted the old shape, failing SDKs that follow the final
revision.
- Vendor schema types at spec commit 71e30695.
- server-stateless: drop the missing-clientInfo rejection case and assert
the opposite (a clientInfo-less request must be served, new check
sep-2575-request-meta-client-info-optional); discover no longer requires
body serverInfo; new SHOULD-level check
sep-2575-server-identifies-in-result-meta (WARNING when the _meta
identity is absent, SKIPPED when discover itself failed).
- request-metadata (client side): the clientInfo SHOULD moves out of the
MUST check into its own id sep-2575-client-sends-client-info (WARNING on
absence), so requirement levels never blend in one check id.
- Mock servers and the everything-server example emit the _meta identity
and accept clientInfo-less requests.
d1c0b95917