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Implement MCP 2026-07-28 (#2286)

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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>
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Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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.changeset/codec-era-gates.md Normal file
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'@modelcontextprotocol/core-internal': minor
'@modelcontextprotocol/client': minor
'@modelcontextprotocol/server': minor
---
Add `SdkErrorCode.MethodNotSupportedByProtocolVersion`: a typed local error raised before anything reaches the transport when a spec method is sent toward a peer whose negotiated protocol version's wire era does not define it (for example `tasks/get` toward a 2026-07-28 peer). The protocol layer now resolves a per-era wire codec from the connection's negotiated protocol version (instance state on `Client`/`Server`, with the legacy era as the pre-negotiation default) and resolves per-method schemas at dispatch time instead of registration time; an edge classification on an inbound message is validated against that instance era, and a mismatch is rejected as an entry/routing error. Behavior on existing (2025-era) connections is unchanged.