Any “tool protocol” is really just a typed function interface.

For decades, we’ve had dozens (hundreds? thousands?) of different formats/languages to describe those.

Why do we keep making more?

Does it really matter who is calling the function and for which purpose? Does it matter if it’s implemented by a server or a command line executable? Does the data transport protocol matter? Does “model” matter?

  interface HelloSayer {
    /** Says hello **/
    String sayHello();
  }