So I guess then MCP would have some elements of REST, but not all? Poking through their lifecycle page[1], it seems that capabilities (effectively RPCs iiuc) are only negotiated at the beginning, all at once. Whereas it seems that REST is about gradual and dynamic enumeration of available options, by following the next step at each request.

[1] https://modelcontextprotocol.io/specification/2025-06-18/bas...