I think it's just another way of accessing anything that doesn't have a traditional API. Most humans interact with things through the world with a web browser,

I think it's just another way of accessing anything that doesn't have a traditional API. Most humans interact with things through the world with a web browser, with a keyboard and a mouse, and so even places that don't have any sort of API can be supported. You can still probably use things that define tool use explicitly, but I think this is kind of becoming a general purpose tool-use of last resort?