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typescript-sdk/.changeset/wire-public-separation.md
Felix Weinberger 1823aae891
 Implement MCP 2026-07-28 (#2286) 
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
2026-06-26 14:01:10 +01:00

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@modelcontextprotocol/core-internal @modelcontextprotocol/client @modelcontextprotocol/server
patch patch patch

Freeze the per-era wire schemas as self-contained copies decoupled from the public types layer, and convert WireCodec to a function-only interface. Two small spec-conformance fixes ride along with the otherwise-pure refactor:

  • The 2026 wire-true resultType member now defaults to 'complete' when absent (the spec's receiver-side back-compat rule); the inbound decodeResult step continues to require it. The server/discover result accepts absent or malformed ttlMs/cacheScope (falling back to 0/'private' per the spec's receiver leniency in caching.mdx) so the version-negotiation probe classifier stays behavior-neutral. Other cacheable result schemas are unchanged here; general receiver leniency for those belongs to the response-cache surface.
  • The sampling hasTools discriminant now keys on tools || toolChoice (previously tools only), aligning the client and server selection of the with-tools result variant with clientCapabilityRequirements.