Turns an OpenAPI 3.0/3.1 document into readable API documentation: servers, authentication schemes, operations grouped by tag with parameters, request bodies and responses (schema references resolved to their names), and component schemas with property tables. It also checks the structure — required fields, undeclared or non-required path parameters, missing responses/operationIds, duplicate operationIds, unresolved $refs — and lists the findings. Output is Markdown you can paste into a wiki, or a JSON summary. Remote references are never fetched; everything runs locally.