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Recommendation 25: formal MCP extension negotiation

Evidence

MCP 2026-07-28 establishes a formal extensions framework so optional features can evolve without silently changing the protocol core.

Proposed improvement

Add a single extension registry describing supported versions, stability, required client capabilities, configuration gates, and fallback behavior. Route Tasks and future UI integrations through it instead of scattered feature flags.

Acceptance criteria

  • Unknown or incompatible extensions never alter core tool behavior.
  • Experimental extensions are disabled by default and labeled in discovery.
  • Registry snapshots are contract-tested across releases.
  • Each extension documents downgrade and removal behavior.

Advertising an extension means protocol support only, not Premiere host support.