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'@modelcontextprotocol/core': patch
'@modelcontextprotocol/codemod': patch
---

Add per-revision spec reference types (2025-11-25 and 2026-07-28) with split comparison tests, and the 2026-07-28 wire contract surface: request-meta key constants, `RequestMetaEnvelopeSchema`, `server/discover` shapes, the typed `-32004` error, the `-32003` code constant, and a `resultType` passthrough on the base result. Types and constants only — no behavior changes.