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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`.
- [MCP 2026-07-28 release](https://blog.modelcontextprotocol.io/posts/2026-07-28)
- [MCP stateless proposal](https://modelcontextprotocol.io/seps/2575-stateless-mcp)
## 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.