Doesn't that only diff two versions of the same contract?

You can also diff with arbitrary versions. The API is, document, but frankly poorly. I don’t think HAL has lived up to that claim Most people expect an OAS-like view of the world

Yes, arbitrary versions, but not arbitrary pacts. I can’t, for example, ask if two consumers have the same expectations (or if they don’t, what is different)

oh right, yes. I still believe a tool like that would be useful