For shrimp ponds the risky pattern is a few cloudy days followed by a still, warm night, since that's when dissolved oxygen crashes before dawn. I'd have the Weather Risk Agent watch hourly cloud cover, wind and night temperature instead of a daily summary. Open-Meteo is free for a student project, or if you want ready-made agent tools, the APIFreaks MCP server has forecast, marine and flood data (I work on it).