Anthropic: MCP received its biggest update since launch.

The main change is that the protocol is now stateless. Previously, remote MCP servers had to maintain session state, making it harder to scale properly and deploy across different types of infrastructure.

Now, MCP servers can be more easily run in serverless, on edge infrastructure, and scaled horizontally behind a load balancer.

Additionally, extensions have become a full-fledged part of the protocol. Examples include:

> MCP Apps — interfaces from the server inside a sandboxed iframe
> Tasks — support for long-running and asynchronous operations
> Enterprise Managed Auth — centralized access management to MCP servers via an identity provider

The release also strengthened authorization and added a formal deprecation policy.

Anthropic MCP Update: Stateless Protocol and New Extensions

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