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2026-07-28 spec
OpenJul 13, 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-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;Implement SEP-2243: server-side custom header validation
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.#979 In modelcontextprotocol/rust-sdk;Investigate request-metadata client conformance scenario (harness crash, no client output)
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsStatus: Open.#981 In modelcontextprotocol/rust-sdk;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;SEP-2468 follow-up: validate issuer in authorization server metadata
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-securitySecurity-related changesSecurity-related changesStatus: Open.#983 In modelcontextprotocol/rust-sdk;auth/pre-registration: new pre-registration-auth conformance check fails
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-securitySecurity-related changesSecurity-related changesStatus: Open.#984 In modelcontextprotocol/rust-sdk;Implement SEP-2350: Clarify client-side scope accumulation (step-up auth)
P1High: significant functionality gap or spec violationHigh: significant functionality gap or spec violationT-bugBug fixes and error correctionsBug fixes and error correctionsT-securitySecurity-related changesSecurity-related changesT-transportTransport layer changesTransport layer changesStatus: Open.#877 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-2352: Clarify authorization server binding and migration
P2Medium: important but non-blocking improvementMedium: important but non-blocking improvementT-enhancementNew features and enhancementsNew features and enhancementsT-securitySecurity-related changesSecurity-related changesT-transportTransport layer changesTransport layer changesStatus: Open.#879 In modelcontextprotocol/rust-sdk;Implement SEP-2575: Make MCP Stateless
P0Critical: blocking, security, data loss, or crashCritical: blocking, security, data loss, or crashT-coreCore library changesCore library changesT-enhancementNew features and enhancementsNew features and enhancementsT-transportTransport layer changesTransport layer changesStatus: Open.#869 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;