but that's my point: there isn't as much library support as there ought be, even for json schema, let alone these newer domain-specific languages that incorperate/extend json schema.

sometimes i think it would make just as much if not sense to define these communication protocols with a bnf grammar (for endpoints and response codes) or to use s-expressions (since json is pretty much just sugared lisp) or some other well-worn-but-adaptable format just because there are already parser generators and scheme interpreters written for every language.