> ## Documentation Index
> Fetch the complete documentation index at: https://agno-v2-service-account.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Tool Use

> Mistral tool use example with a custom function tool.

```python tool_use.py theme={null}
"""Mistral tool use example with a custom function tool."""

import asyncio
import json

from agno.agent import Agent
from agno.models.mistral import MistralChat
from agno.tools import tool

# ---------------------------------------------------------------------------
# Define a tool
# ---------------------------------------------------------------------------


@tool
def get_weather(city: str) -> str:
    """Get the current weather for a city.

    Args:
        city: The city name to get weather for.
    """
    weather_data = {
        "Paris": {"temp": 18, "condition": "cloudy", "humidity": 65},
        "London": {"temp": 14, "condition": "rainy", "humidity": 80},
        "Tokyo": {"temp": 22, "condition": "sunny", "humidity": 50},
        "New York": {"temp": 20, "condition": "partly cloudy", "humidity": 55},
    }
    data = weather_data.get(city, {"temp": 20, "condition": "unknown", "humidity": 50})
    return json.dumps(data)


# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------

agent = Agent(
    model=MistralChat(id="mistral-large-latest"),
    tools=[get_weather],
    markdown=True,
)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    # --- Sync ---
    agent.print_response("What is the weather in Paris and Tokyo?")

    # --- Async ---
    asyncio.run(agent.aprint_response("What is the weather in London and New York?"))
```

## Run the Example

<Steps>
  <Snippet file="create-venv-step.mdx" />

  <Step title="Install dependencies">
    ```bash theme={null}
    uv pip install -U agno mistralai
    ```
  </Step>

  <Step title="Export your Mistral API key">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export MISTRAL_API_KEY="your_mistral_api_key_here"
      ```

      ```bash Windows theme={null}
      $Env:MISTRAL_API_KEY="your_mistral_api_key_here"
      ```
    </CodeGroup>
  </Step>

  <Step title="Run the example">
    Save the code above as `tool_use.py`, then run:

    ```bash theme={null}
    python tool_use.py
    ```
  </Step>
</Steps>

Full source: [cookbook/90\_models/mistral/tool\_use.py](https://github.com/agno-agi/agno/blob/main/cookbook/90_models/mistral/tool_use.py)