MCP Went Stateless: Migrating to the 2026-07-28 Spec (and Proving It Works)
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Detailed migration guide for MCP spec update, highly relevant to AI agent tooling.
Summary
The 2026-07-28 MCP spec removes sessions and the initialize handshake, requiring self-contained requests with protocol version in _meta and mandatory Mcp-Method/Mcp-Name headers for stateless routing. Two new TypeScript packages (@modelcontextprotocol/client@2, server@2) coexist with legacy 1.x SDK; server/discover is now a MUST. The migration effectively adds a second wire protocol, and the top security concern is an unsigned requestState blob that becomes attacker-controlled input.