APIs have an MxN problem. N tools each need to implement M different APIs.

In nearly every case (that an end user cares about), an API will also have a GUI frontend. The GUI is discoverable, able to be authenticated against, definitely exists, and generally usable by the lowest common denominator. Teaching the AI to use this generically, solves the same problem as implementing support for a bunch of APIs without the discoverability and existence problems. In many ways this is horrific compute waste, but it's also a generic MxN solution.