MCP 2026-07-28 Drops Sessions. Your Server Just Broke.
The Model Context Protocol 2026-07-28 specification shipped on July 28, 2026. And it is the largest rewrite since MCP launched.
The headline change is simple to state and hard to undo: the protocol core is now stateless. That means the `initialize` handshake, the `Mcp-Session-Id` header. And the session model that