Before your agent verifies a weather-dependent claim, backtests a parametric trigger or checks what conditions a site or shipment faced: daily 2 m temperature, total precipitation and 10 m wind at any GPS point or city for a past date, from the Copernicus ERA5 reanalysis — temperature and precipitation cover a rolling 30-year window, wind a rolling ~5-year window — with the served grid cell and a coverage flag.

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