structured_output_strict_tools.py
"""Example demonstrating strict tool use with Anthropic structured outputs.
Strict tool use ensures that tool parameters strictly follow the input_schema.
"""
from agno.agent import Agent
from agno.models.anthropic import Claude
from agno.tools import Function
from pydantic import BaseModel
# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
class WeatherInfo(BaseModel):
"""Structured output schema for weather information."""
location: str
temperature: float
unit: str
condition: str
def get_weather(location: str, unit: str = "celsius") -> str:
temp = 72 if unit == "fahrenheit" else 22
return f"Weather in {location}: {temp}°{unit}, Sunny"
# Create function with strict mode enabled
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"],
"additionalProperties": False,
},
strict=True, # Enable strict mode for validated tool parameters
entrypoint=get_weather,
)
# Agent with both structured outputs and strict tool
agent = Agent(
model=Claude(id="claude-sonnet-4-5-20250929"),
tools=[weather_tool],
output_schema=WeatherInfo,
description="You help users get weather information.",
)
# The agent will use strict tool validation and return structured output
agent.print_response("What's the weather like in San Francisco?")
# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
pass
Run the Example
1
Set up your virtual environment
uv venv --python 3.12
source .venv/bin/activate
uv venv --python 3.12
.venv\Scripts\activate
2
Install dependencies
uv pip install -U agno anthropic
3
Export your Anthropic API key
export ANTHROPIC_API_KEY="your_anthropic_api_key_here"
$Env:ANTHROPIC_API_KEY="your_anthropic_api_key_here"
4
Run the example
Save the code above as
structured_output_strict_tools.py, then run:python structured_output_strict_tools.py