MCP goes stateless: what the 2026 spec changes for servers
The official MCP specification dated July 28, 2026 removes the session model. The initialize/initialized handshake and Mcp-Session-Id header are dropped; state now travels via _meta and explicit identifiers, with routing through Mcp-Method and Mcp-Name headers.
- 2026-07-28 spec replaces 2025-11-25 version and drops sessions
- Each request carries _meta with client version and capabilities
- New server/discover method requests server capabilities
- Routing via Mcp-Method and Mcp-Name headers; mismatch gives HeaderMismatch
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