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OpenJul 22, 2026
Due by July 28, 2026
•Last updated Issues shipping with the 2026-07-28 spec support (issues only — PRs carry the 2026-07-28 label instead, so the progress bar reflects work items, not PR count). Conformance tracking: #977
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Implement SEP-2260: Server requests must associate with a client request
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-enhancementNew features and enhancementsNew features and enhancementsT-serviceService layer changesService layer changesT-transportTransport layer changesTransport layer changesStatus: Open.#873 In modelcontextprotocol/rust-sdk;Implement client-side TTL-honoring cache (SEP-2549 follow-up)
P2Medium: important but non-blocking improvementMedium: important but non-blocking improvementT-enhancementNew features and enhancementsNew features and enhancementsT-modelModel/data structure changesModel/data structure changesT-serviceService layer changesService layer changesStatus: Open.#974 In modelcontextprotocol/rust-sdk;Conformance client: legacy-lifecycle scenarios fail with -32020 missing MCP-Protocol-Version header at 2026-07-28
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-testTesting related changesTesting related changesStatus: Open.#1002 In modelcontextprotocol/rust-sdk;