Comment by jspahrsummers

You can read how we're implementing versioning here: https://spec.modelcontextprotocol.io/specification/basic/ver...

It's not exactly immutable, but any backwards incompatible changes would require a version bump.

We don't have a roadmap in one particular place, but we'll be populating GitHub Issues, etc. with all the stuff we want to get to! We want to develop this in the open, with the community.