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Recommendation 21: stateless MCP 2026-07-28 migration

Evidence

MCP 2026-07-28 removes the initialization handshake and protocol session. Each request carries its protocol version and client capabilities, while discovery moves to server/discover.

Proposed improvement

Add a negotiated 2026-07-28 HTTP path while preserving the current legacy path. Make every request independently validate version, client capabilities, authentication, and server identity; remove any hidden dependency on transport affinity.

Acceptance criteria

  • Tests distribute consecutive requests across fresh server instances without losing application handles.
  • Legacy clients negotiate the existing protocol rather than receiving partial 2026 behavior.
  • Unsupported versions fail with the specified typed error.
  • A migration document identifies every session-derived assumption.

Stateless transport does not make Premiere project state stateless or prove host execution.