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typescript-sdk/.changeset/add-request-state-codec.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/server
minor

Add createRequestStateCodec({ key, ttlSeconds?, bind? }), an opt-in HMAC-SHA256 sealing helper for the multi-round-trip requestState: mint seals a JSON-serializable payload (with TTL and optional context binding) and verify drops directly into ServerOptions.requestState.verify. WebCrypto-based and runtime-neutral; verification is fail-closed and constant-time. The ServerOptions.requestState.verify hook's return type is widened to unknown | Promise<unknown> (the seam already discarded the return value) so the codec's verify is directly assignable.