mmprobe OpenAPI Lint

POST an OpenAPI 3 document (inline, or by URL to fetch) and get structured findings: duplicate operationIds, missing error responses, broken $refs, non-HTTPS servers, missing summaries, and more. Returns severity/rule/path/message findings plus an error/warning/info summary. Built for API providers shipping marketplace-grade specs. Health at GET /health, spec at GET /openapi.json.