Protocol
How agents talk to tools. Took its first breaking change since 2025 to handle agents that are long-lived rather than short-lived.
2026-07-28 first breaking spec revision
· L5 Tooling and infrastructure · Stateless · Confirmed
MCP is the standard that lets AI agents use outside tools. Its first breaking change since November 2025 removes the setup handshake, so every request now carries its own version and permissions. Anything built on the old session behaviour has to be rewritten.
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