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Aqueduct applications auto-generate an OpenAPI 3.0 document.

Most of your OpenAPI document is generated by reflecting on your application code, especially ResourceController subclasses. You add customization or additional information by overriding methods in APIComponentDocumenter and APIOperationDocumenter. At minimum, you override methods in your ResourceController to document the responses your application will send for a particular endpoint.

You create documents with the aqueduct document command-line tool.