One nice thing about HyperSwitch is that it automatically creates an API sandbox for experimenting with an API using the OpenAPI 3.0 definition for the API.
It might be useful to have an API sandbox for RESTful APIs in MediaWiki. Open questions: would they be hand-coded, or automatically generated? If the latter, would there then be a way to provide an OpenAPI 3.0 definition to the system? Or would the sandbox layout be defined some other way?