GitBook OpenAPI GitBook turns an OpenAPI document into interactive, testable API reference blocks. You give it a spec (as JSON or YAML), and it renders endpoints, parameters, schemas, auth, and an in-page request runner. Most of the customization happens inside the spec itself through extensions, not in the GitBook UI, so the bulk of any task here is editing OpenAPI YAML correctly. This skill covers the full surface: getting a spec into GitBook, generating reference pages, structuring navigation, making the "Test it" runner work, controlling how operations and schemas display, and automating…