Beta SDKs for the 2026-07-28 MCP Spec Release Candidate Are Here

The MCP protocol is about to undergo its biggest revision since launch. As you might’ve seen from our recent release candidate announcement, the new protocol revision goes stateless, removing the initialize handshake and the protocol-level session, and completing the plan we laid out in The Future of MCP Transports. If you’re building MCP servers, you can now scale them using a simple round-robin load balancer, removing the need to manage sticky sessions and to store shared sessions. For client developers, new patterns, like Multi Round-Trip Requests (MRTR) enable a whole new range of possibilities for server-to-client interactions. You can check out the full changelog to see what’s coming. ...

June 29, 2026 · 9 min · Felix Weinberger (TypeScript SDK Lead), Max Isbey (Python SDK Lead), Den Delimarsky (Lead Maintainer)