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

# Message History In Hooks

> Access the current run's message history inside tool pre/post hooks via run_context.messages.

```python message_history_in_hooks.py theme={null}
"""
Message History In Hooks
=============================

Access the current run's message history inside tool pre/post hooks
via run_context.messages.
"""

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.run.base import RunContext
from agno.tools import FunctionCall, tool

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


def pre_hook(run_context: RunContext, fc: FunctionCall):
    msgs = run_context.messages
    count = len(msgs) if msgs else 0
    print(f"[pre-hook] {fc.function.name} - {count} messages in run")


def post_hook(run_context: RunContext, fc: FunctionCall):
    msgs = run_context.messages
    count = len(msgs) if msgs else 0
    print(
        f"[post-hook] {fc.function.name} returned '{fc.result}' - {count} messages in run"
    )


@tool(pre_hook=pre_hook, post_hook=post_hook)
def get_weather(city: str) -> str:
    """Get the current weather for a city."""
    return f"Sunny, 72F in {city}"


agent = Agent(
    model=OpenAIChat(id="gpt-4o-mini"),
    tools=[get_weather],
    instructions=["Use the tools to help the user."],
)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    agent.print_response("What is the weather in San Francisco?")
```

## Run the Example

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

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

  <Step title="Export your OpenAI API key">
    <CodeGroup>
      ```bash Mac/Linux theme={null}
      export OPENAI_API_KEY="your_openai_api_key_here"
      ```

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

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

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

Full source: [cookbook/91\_tools/tool\_hooks/message\_history\_in\_hooks.py](https://github.com/agno-agi/agno/blob/main/cookbook/91_tools/tool_hooks/message_history_in_hooks.py)