Pattern: MCP Is Going Stateless — Session-Bound Server Designs Are Now Legacy

Model Context Protocol Blog·high signal

The 2026-07-28 spec moves MCP from session-bound to stateless at the protocol layer, shifting responsibility for state and identity from the protocol to server and platform operators. Expect a wave of MCP servers rewritten to be horizontally scalable and cacheable, plus a matching wave of new attack surface around predictable tracking IDs; migrations should be planned inside the 12-month deprecation window rather than deferred.