Tracking issue for the MCP Spec 2026-07-28 release — Governance & lifecycle milestone.

Coherent governance bundle: lifecycle policy (2596) governs what gets deprecated, conformance tests (2484) gate when SEPs go Final, and SDK tiers (1730) measure how well each SDK keeps up. SEP-2577 is the first concrete deprecation pass under the new policy.

SEPs covered

Sub-issues

• [Server][Client][Docs] SEP-2577: Mark Roots/Sampling/Logging @deprecated, emit notices, document migration #365 — SEP-2577: Mark Roots/Sampling/Logging @deprecated, emit notices, document migration
• [Docs] SEP-2596: Adopt MCP feature lifecycle policy; document PHP SDK BC promise mirroring 12-month spec window #366 — SEP-2596: Adopt MCP feature lifecycle policy; document PHP SDK BC promise
• [Conformance] SEP-2484: Wire SEP traceability files into conformance test runner; surface per-SEP pass rates #367 — SEP-2484: Wire SEP traceability files into conformance test runner
• [Meta] SEP-1730: Target SDK Tier 2 classification — gap analysis, roadmap, dependency policy #368 — SEP-1730: Target SDK Tier 2 classification — gap analysis, roadmap, dependency policy

Notes

• All four SEPs are merged.
• SEP-2577: implementations of Roots/Sampling/Logging stay — only public APIs gain @deprecated, plus runtime notices. Minimum 12-month removal window per SEP-2596.
• SEP-1730: realistic target is Tier 2 immediately, Tier 1 post-1.0.