{"name":"roman","title":"Roman Numeral Converter","category":"math","description":"Convert an integer (1..3999) to Roman numerals or back.","price_usd":0.001,"input_schema":{"type":"object","properties":{"mode":{"type":"string","description":"Direction","enum":["to_roman","to_int"]},"number":{"type":"integer","description":"Integer 1..3999 (to_roman)"},"roman":{"type":"string","description":"Roman numeral string (to_int)"}},"additionalProperties":false}}