Update tools/mapbox_tools.py

Extended the docstring, imported os

tools/mapbox_tools.py

@@ -1,7 +1,7 @@
 import requests
 from typing import Dict, List, Optional
 from smolagents import tool
-import math
+import math, os
 
 # constants
 WGS84_AVG_EARTH_RADIUS = 637100080.0  # in centimeters
@@ -46,6 +46,7 @@ def search_nearby_places(latitude: float, longitude: float, radius: int = 1000,
         latitude: The latitude coordinate of the center point
         longitude: The longitude coordinate of the center point
         radius: The radius (in meters) to search within
+        category: Point of Interest (POI) category to search
     """
     # Mapbox Search API endpoint
     url = f"https://api.mapbox.com/search/searchbox/v1/category/{category}"