MCP Goes Stateless: What the July 2026 Protocol Change Means for AI Tools

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The Model Context Protocol (MCP), which connects AI assistants to external tools and databases, dropped protocol-level sessions in its July 28, 2026 specification update. Previously, servers issued session IDs during an initialization handshake, which clients attached to subsequent requests so servers could recover earlier context. This approach created infrastructure challenges when services ran across multiple machines, requiring sticky routing or shared session databases. The new stateless design removes the handshake entirely, allowing any compatible server instance to process an incoming request without prior session data. Application state such as open browser tabs or database transactions can still exist, but is now managed through explicit resource handles returned by tools rather than through protocol-level sessions.

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