{"ok":true,"tool":"Body Fat Calculator","operation":"calculate-body-fat","description":"Estimate body fat percentage and category using the US Navy method.","method":"POST","endpoint":"/api/body-fat-calculator","webUrl":"https://toolhub-5eo.pages.dev/tools/body-fat-calculator","parameters":{"type":"object","properties":{"gender":{"type":"string","enum":["male","female"],"description":"Biological sex"},"height":{"type":"number","description":"Height in cm"},"neck":{"type":"number","description":"Neck circumference in cm"},"waist":{"type":"number","description":"Waist circumference in cm"},"hip":{"type":"number","description":"Hip circumference in cm (required for females)"}},"required":["gender","height","neck","waist"]},"response":{"type":"object","properties":{"bodyFatPercent":{"type":"number"},"category":{"type":"string"},"method":{"type":"string"}}},"example":{"request":{"gender":"male","height":180,"neck":38,"waist":84},"response_shape":{"type":"object","properties":{"bodyFatPercent":{"type":"number"},"category":{"type":"string"},"method":{"type":"string"}}}},"howToCall":"POST a JSON body to https://toolhub-5eo.pages.dev/api/body-fat-calculator. Returns {\"ok\":true,\"result\":{...}} on success or {\"ok\":false,\"error\":\"...\"} on failure. No auth, CORS-enabled.","parametersSummary":"  gender (string, required, one of: male|female) — Biological sex\n  height (number, required) — Height in cm\n  neck (number, required) — Neck circumference in cm\n  waist (number, required) — Waist circumference in cm\n  hip (number, optional) — Hip circumference in cm (required for females)","curlExample":"curl -X POST https://toolhub-5eo.pages.dev/api/body-fat-calculator -H \"Content-Type: application/json\" -d '{\"gender\":\"male\",\"height\":180,\"neck\":38,\"waist\":84}'"}