I'm guessing this is the same generator running on the online swagger/openapi editor https://editor.swagger.io/ It's a really quick way in to trying these things out.

Now, what I'm finding is that the assumptions made in the generator are all wrong for my use-case today. I will have to fork it to make the changes (PRO: I *can* fork it to make changes, which is awesome). So, to ditch the baked-in Guzzle, not that I wouldn't be using it in many instances, but moving to PSR-7+PSR-17+PSR-18 is where I am heading.