No, that's not MCP. That's a pleasant idea that MCP has been shoehorned into trying to solve. But MCP the spec is far more complicated than it needs to be to support that story. Streamable HTTP transport makes it much more workable, and I imagine was designed by real people rather than the version prior to that, but it's still much more than it needs.

Ultimately, 90% of use cases would be solved by a dramatically simpler spec which was simply an API discovery mechanism, maybe an OpenAPI spec at a .well-known location, and a simple public-client based OAuth approach for authentication and authorization. The full-on DCR approach and stateful connections specified in the spec is dramatically harder to implement.