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OpenJul 18, 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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Stateless streamable HTTP: tools/call with progress returns notification as response body
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-transportTransport layer changesTransport layer changesStatus: Open.#980 In modelcontextprotocol/rust-sdk;Implement SEP-2243: standardized & custom HTTP headers (client)
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-enhancementNew features and enhancementsNew features and enhancementsT-transportTransport layer changesTransport layer changesStatus: Open.#978 In modelcontextprotocol/rust-sdk;CI: run full 2026-07-28 conformance suites instead of hand-picked scenario lists
P2Medium: important but non-blocking improvementMedium: important but non-blocking improvementT-enhancementNew features and enhancementsNew features and enhancementsStatus: Open.#985 In modelcontextprotocol/rust-sdk;- Status: Open.#977 In modelcontextprotocol/rust-sdk;
Implement SEP-2567: Sessionless MCP via Explicit State Handles
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-coreCore library changesCore library changesT-enhancementNew features and enhancementsNew features and enhancementsT-transportTransport layer changesTransport layer changesStatus: Open.#870 In modelcontextprotocol/rust-sdk;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;Conformance server: json-schema-2020-12 SEP-2106 keyword-preservation checks fail (4/7)
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-testTesting related changesTesting related changesStatus: Open.#1003 In modelcontextprotocol/rust-sdk;server-stateless conformance: 7 remaining check failures after SEP-2575 foundation (18/25)
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-coreCore library changesCore library changesT-transportTransport layer changesTransport layer changesStatus: Open.#1004 In modelcontextprotocol/rust-sdk;