MCP 2026-07-28 specification rewrites the protocol as fully stateless, eliminating required session handshakes, sticky sessions, and open streams. Each request now carries its own context, enabling MCP servers to run as ordinary HTTP workloads on Cloudflare Workers without Durable Objects. Key changes include Multi Round-Trip Requests (MRTR) replacing stream-dependent elicitations, new Mcp-Method and Mcp-Name HTTP headers for gateway-level routing, tightened OAuth authorization with Client ID Metadata Documents, and a formal feature lifecycle with 12-month deprecation windows. The createMcpHandler API graduates into the official MCP TypeScript SDK. Cloudflare's Agents SDK has supported the new spec since day one, and early adopters like Sentry and Linear are already running it in production.
