It all depends on how concise and easy to use this is. My experience with yaml/json API generators is that they are extremely buggy due to myriad edge cases. If

It all depends on how concise and easy to use this is. My experience with yaml/json API generators is that they are extremely buggy due to myriad edge cases. If it goes stale, it's because it takes an hour to figure out how to represent what you want to say in the language, vs. just writing a json blob with some non-machine-readable type annotations. This is self-contained enough that I could see the language not mattering too much. And while I don't use Racket at all it sounds like the ideal language for this task. I'm not saying it confidently, but I wouldn't be surprised if the Racket implementation is less buggy than any non-lisp. Generating YAML/JSON is a task which lisp might be uniquely suited for.