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

# Tools

> Call DuckDuckGoTools from an OpenRouter Responses agent and stream the answer.

Tool use example using OpenRouter with the Responses API.

```python tool_use.py theme={null}
"""Tool use example using OpenRouter with the Responses API.

This demonstrates using tools with OpenRouter's Responses API endpoint.

Requirements:
- Set OPENROUTER_API_KEY environment variable
"""

from agno.agent import Agent
from agno.models.openrouter import OpenRouterResponses
from agno.tools.duckduckgo import DuckDuckGoTools

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

agent = Agent(
    model=OpenRouterResponses(id="openai/gpt-oss-20b", reasoning={"enabled": True}),
    tools=[DuckDuckGoTools()],
    markdown=True,
)

agent.print_response("What is the latest news about AI?", stream=True)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    pass
```

## Run the Example

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

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

  <Step title="Export your OpenRouter API key">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export OPENROUTER_API_KEY="your_openrouter_api_key_here"
      ```

      ```bash Windows theme={null}
      $Env:OPENROUTER_API_KEY="your_openrouter_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/openrouter/responses/tool\_use.py](https://github.com/agno-agi/agno/blob/main/cookbook/90_models/openrouter/responses/tool_use.py)