Comment by whalesalad

Agreed. At the end of the day we are talking about RPC. A named method, with known arguments, over the wire. A simple HTTP request comes to mind. But that would just be too easy. Oh wait, that is what all of these are under the hood. We are so cooked.

    from fastmcp import FastMCP

    mcp = FastMCP("Demo ")

    @mcp.tool()
    def add(a: int, b: int) -> int:
        """Add two numbers"""
        return a + b

This is an example of fastmcp. Notice anything? Replace 2-3 lines of code and this is a Flask or FastAPI application. Why are we not just going all-in on REST/HATEOAS for these things? My only hunch is that either 1. the people designing/proselytizing these "cutting edge" solutions are simply ignorant to how systems communicate and all the existing methods that exist, or 2. they know full well that this is just existing concepts with a new shiny name but don't care because they want to ride the hype train and take advantage of it.