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"""
Stream Hook
=============================

Example demonstrating sending a notification to the user after an agent generates a response.
"""

import asyncio

from agno.agent import Agent
from agno.models.openai import OpenAIResponses
from agno.run import RunContext
from agno.run.agent import RunOutput
from agno.tools.yfinance import YFinanceTools


def send_notification(run_output: RunOutput, run_context: RunContext) -> None:
    """
    Post-hook: Send a notification to the user.
    """
    if run_context.metadata is None:
        return
    email = run_context.metadata.get("email")
    if email:
        send_email(email, run_output.content)


def send_email(email: str, content: str) -> None:
    """
    Send an email to the user. Mock, just for the example.
    """
    print(f"Sending email to {email}: {content}")


# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
async def main():
    # Agent with comprehensive output validation

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

    agent = Agent(
        name="Financial Report Agent",
        model=OpenAIResponses(id="gpt-5-mini"),
        post_hooks=[send_notification],
        tools=[YFinanceTools()],
        instructions=[
            "You are a helpful financial report agent.",
            "Generate a financial report for the given company.",
            "Keep it short and concise.",
        ],
    )

    # Run the agent
    await agent.aprint_response(
        "Generate a financial report for Apple (AAPL).",
        user_id="user_123",
        metadata={"email": "[email protected]"},
        stream=True,
    )


# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    asyncio.run(main())

​
Run the Example

# Clone and setup repo
git clone https://github.com/agno-agi/agno.git
cd agno/cookbook/02_agents/09_hooks

# Create and activate virtual environment
./scripts/demo_setup.sh
source .venvs/demo/bin/activate

python stream_hook.py