MCP Protocol Goes Stateless in Major July 2026 Spec Overhaul

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The Model Context Protocol (MCP) received its largest revision on July 28, 2026, eliminating the stateful handshake that previously complicated remote server deployments. Six Specification Enhancement Proposals collectively remove session IDs and the initialize/initialized exchange, making every request self-describing via inline metadata. Routing information now travels in HTTP headers, allowing standard round-robin load balancers to distribute traffic without sticky sessions or shared storage. List endpoints gain caching support with TTL and scope fields, while server-to-client interactions like elicitation are redesigned as multi-round-trip client-initiated requests. The spec also tightens OAuth authorization rules and formally deprecates legacy transports including HTTP+SSE, with a minimum twelve-month migration window.

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