Tip: Migrating an MCP Server to the Stateless Spec — Drop the Handshake and Move Session State to a Backing Store

jsmanifest·medium signal

To adopt the 2026-07-28 stateless core, stop relying on the initialize/initialized handshake and the Mcp-Session-Id header, and relocate any per-session state into a shared backing store so any instance can serve any request. This unlocks horizontal scaling and response caching, but requires auditing every tool that assumed in-process session memory. Plan the change against the spec's formal deprecation window before legacy session behavior is removed.