Thanks for that. Took a look at it, and... it doesn't handle 3.1 documents correctly. One of the major defects in the OpenAPI document spec pre-3.1 is that you can't put descriptions on any usage of a model in your API. I mean... WTF?

So if you had a data structure called User, and you used it to represent users in different roles in your API somehow, you can't annotate the instances of User in your document to say what kind of user you're talking about. You can annotate the elements inside the User model (like strings, numbers, or whatever) but not usages of the model itself. Before version 3.1, this blunder rendered OpenAPI half-useless for one of its core purposes: documenting your API.

API-Fiddle acts as though that's still true. There is no Description button anywhere in your schema alongside any use of a model.