Find OSM features within a radius around a geographic point via the Overpass API. The primary tool for "what's near X?" spatial queries. Use amenity for common POI types (hospital, pharmacy, restaurant, cafe, school, atm, etc.) or tag_key + tag_value for other OSM categories (leisure=park, shop=supermarket, natural=peak). Exactly one of amenity or tag_key/tag_value must be provided. Results include all element types specified (nodes cover standalone POIs, ways cover buildings and areas), each with its full OSM tag set, sorted nearest-first by distance_meters from the center point. The extratags flag is not needed here — it applies only to the Nominatim-backed geocode/reverse/lookup tools.
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