Spec

The release candidate for MCP 2026-07-28 is now available. It is the largest revision of the protocol since launch and delivers on the 2026 roadmap: a stateless core that scales on ordinary HTTP infrastructure extensions including server-rendered UIs through MCP Apps and long-running work through the Tasks extension authorization that aligns more closely with OAuth and OpenID Connect deployments a formal deprecation policy so the protocol can evolve without breaking what you’ve built, and many other changes. ...

Today, MCP turns one year old. You can check out the original announcement blog post if you don’t believe us. It’s hard to imagine that a little open-source experiment, a protocol to provide context to models, became the de-facto standard for this very scenario in less than twelve months. But not only do we hit the first anniversary milestone today - we’re also releasing a brand-new MCP specification version. Before we get to the details of what’s new, let’s do a bit of a retrospective. ...