Anthropic rewrites MCP to make servers cloud-friendly and stateless
xiaohu · x · 2026-07-29
Anthropic has released a major new MCP specification that removes the protocol’s session-based state model and makes MCP servers much easier to run in the cloud.
The old design required clients to initialize a session, receive a session ID, and then keep talking to the same machine. That made horizontal scaling awkward, prevented serverless and edge deployments, and forced gateways to understand session stickiness.
The new spec changes the core model to stateless request/response:
- handshake and session IDs are removed
- each request carries its own identity/context
- any machine can handle any request behind a normal load balancer
When a server needs to ask the user for something mid-flow, it now returns an "I need more info" response and the client resubmits the original request after collecting that input.
The article also notes that:
- Roots, Sampling, Logging, and legacy HTTP+SSE transport remain available for at least 12 months
- old and new implementations stay interoperable for now
- security tradeoffs shift more responsibility to application developers, even as session-hijacking risk is reduced
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