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[2026-07-28] Governance: deprecations, lifecycle, conformance, SDK tier #339

Description

@chr-hertel

Tracking issue for the MCP Spec 2026-07-28 releaseGovernance & 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

SEP Title Spec PR
SEP-2577 Deprecate Roots, Sampling, and Logging #2577
SEP-2596 Feature Lifecycle and Deprecation Policy #2596
SEP-2484 Conformance Tests required for Final status #2484
SEP-1730 SDK Tiers definition #1777

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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.

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    2026-07-28All issues and PRs related to the spec release 2026-07-28ClientIssues & PRs related to the Client componentP1Significant bug affecting many users, highly requested featureServerIssues & PRs related to the Server componentdocumentationImprovements or additions to documentationenhancementRequest for a new feature that's not currently supportedimproves spec complianceImproves consistency with other SDKs such as TyepScript

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