Agent with Structured Outputs and Strict Tools

from agno.agent import Agent
from agno.models.anthropic import Claude
from agno.tools import Function
from pydantic import BaseModel


class WeatherInfo(BaseModel):
    location: str
    temperature: float
    unit: str
    condition: str


def get_weather(location: str, unit: str) -> str:
    temp = 72 if unit == "fahrenheit" else 22
    symbol = "F" if unit == "fahrenheit" else "C"
    return f"Weather in {location}: {temp} degrees {symbol}, sunny"


weather_tool = Function(
    name="get_weather",
    description="Get current weather information for a location",
    parameters={
        "type": "object",
        "properties": {
            "location": {
                "type": "string",
                "description": "The city and state, e.g. San Francisco, CA",
            },
            "unit": {
                "type": "string",
                "enum": ["celsius", "fahrenheit"],
                "description": "Temperature unit",
            },
        },
        "required": ["location", "unit"],
        "additionalProperties": False,
    },
    strict=True,
    entrypoint=get_weather,
)

agent = Agent(
    model=Claude(id="claude-sonnet-4-6"),
    tools=[weather_tool],
    output_schema=WeatherInfo,
    description="You help users get weather information.",
)

if __name__ == "__main__":
    agent.print_response("What's the weather like in San Francisco?")