tool.py

from smolagents import Tool
from typing import Optional

class SimpleTool(Tool):
    name = "get_travel_duration"
    description = "Gets the travel time in car between two places."
    inputs = {"start_location":{"type":"string","description":"the place from which you start your ride"},"destination_location":{"type":"string","description":"the place of arrival"},"transportation_mode":{"type":"string","nullable":True,"description":"The transportation mode, in 'driving', 'walking', 'bicycling', or 'transit'.}}
    output_type = "string"

    def forward(self, start_location: str, destination_location: str, transportation_mode: Optional[string] = None) -> str:
        """Gets the travel time in car between two places.
    
        Args:
            start_location: the place from which you start your ride
            destination_location: the place of arrival
            transportation_mode: The transportation mode, in 'driving', 'walking', 'bicycling', or 'transit'.
        """
        import googlemaps
        import os

        gmaps = googlemaps.Client(os.getenv("GMAPS_API_KEY"))

        if transportation_mode is None:
            transportation_mode = "transit"
        try:
            directions_result = gmaps.directions(
                start_location,
                destination_location,
                mode=transportation_mode,
                departure_time=datetime(2025, 1, 6, 11, 0), # Start on a Monday morning
            )
            return directions_result[0]["legs"][0]["duration"]["text"]
        except Exception as e:
            print(e, directions_result)
            return e