{"ok":true,"tool":"Circle Calculator","operation":"calculate-circle","description":"Calculate area, circumference, or diameter of a circle.","method":"POST","endpoint":"/api/circle-calculator","webUrl":"https://ultraquick.tools/tools/circle-calculator","parameters":{"type":"object","properties":{"radius":{"type":"number","description":"The radius of the circle"},"calculation":{"type":"string","enum":["area","circumference","diameter"],"description":"What to calculate (default area)"}},"required":["radius"]},"response":{"type":"object","properties":{"area":{"type":"number"},"circumference":{"type":"number"},"diameter":{"type":"number"},"radius":{"type":"number"}}},"example":{"request":{"radius":5,"calculation":"area"},"response_shape":{"type":"object","properties":{"area":{"type":"number"},"circumference":{"type":"number"},"diameter":{"type":"number"},"radius":{"type":"number"}}}},"howToCall":"POST a JSON body to https://ultraquick.tools/api/circle-calculator. Returns {\"ok\":true,\"result\":{...}} on success or {\"ok\":false,\"error\":\"...\"} on failure. No auth, CORS-enabled.","parametersSummary":"  radius (number, required) — The radius of the circle\n  calculation (string, optional, one of: area|circumference|diameter) — What to calculate (default area)","curlExample":"curl -X POST https://ultraquick.tools/api/circle-calculator -H \"Content-Type: application/json\" -d '{\"radius\":5,\"calculation\":\"area\"}'"}