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Google details the MCP spec change that deletes the handshake and session ID entirely
Google published an August 5 post explaining the 2026-07-28 MCP specification, which removes the initialize/initialized handshake (SEP-2575) and the Mcp-Session-Id header (SEP-2567), making the protocol core stateless. Google says it led the change via PR #2575 and co-founded the MCP Transports Working Group with Hugging Face because it needed MCP to scale across millions of concurrent queries. Concretely this kills sticky-session load balancing and Redis session stores, and lets MCP servers scale to zero on Cloud Run; Python ships as mcp[cli]==2.0.0b1, Go as v1.7.0, with TypeScript split into separate server and client beta packages.
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