In other words, there’s no commonly-used, agreed upon standard for creating APIs. The closest is REST-like APIs, which are really no more specific than “hit a URL and get some data back”.

So why are we all bitching about it? Programmatically communicating with an ML model is a new thing, and it makes sense it might need some new concepts. It’s basically just a wrapper with a couple of opinions. Who cares. It’s probably better to be more opinionated about what exactly you put into MCP, rather than just exposing your hundreds of existing endpoints.