This is so cool hope to play around with it tonight. I converted the API to a OAS/swagger file and temporarily hosted them here to play around with while the site is hugged to death https://mariomaker2api.apidocumentation.com/
This is definitely a more Javascript heavy approach but without JS you can't get some nice quality of life features like the embedded REST API client for experimenting with endpoints.
As for LLMs we have had the best experience passing them Swagger files directly and not relying on an intermediate parse to text.
Besides being huge fans of OSS software we really feel like packages like this only make sense in an Open Source environment. Licensing for developer tooling can't be restrictive or it's just a hassle to use. There great open source business models around support, service, and hosting.
If there's any specific things big or small we can do to help convince your enterprise employer please don't hesitate to reach out ([email protected]) or just let us know in the comments :)