You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "circle_area", "description": "Computes the area of a circle given its radius.", "parameters": {"radius": {"description": "The radius of the circle.", "type": "float"}}}]
Calculate the area of a circle with a radius of 7.5 units.
user
assistant
[{"name": "circle_area", "arguments": {"radius": 7.5}}]