{"name":"date_diff","title":"Date Difference Calculator","category":"math","description":"Days, weeks, months and business days between two ISO dates.","price_usd":0.001,"input_schema":{"type":"object","properties":{"start_date":{"type":"string","description":"Start date, ISO 'YYYY-MM-DD'"},"end_date":{"type":"string","description":"End date, ISO 'YYYY-MM-DD'"}},"additionalProperties":false,"required":["start_date","end_date"]}}