Reasoning Agent Events

Stream agent events including run lifecycle, tool calls, and content output.

Reasoning Agent Events.

"""
Reasoning Agent Events
=============================

Reasoning Agent Events.
"""

import asyncio

from agno.agent import RunEvent
from agno.agent.agent import Agent
from agno.models.openai import OpenAIResponses

# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
finance_agent = Agent(
    model=OpenAIResponses(id="gpt-5.2"),
    reasoning=True,
)


async def run_agent_with_events(prompt: str):
    content_started = False
    async for run_output_event in finance_agent.arun(
        prompt,
        stream=True,
        stream_events=True,
    ):
        if run_output_event.event in [RunEvent.run_started, RunEvent.run_completed]:
            print(f"\nEVENT: {run_output_event.event}")

        if run_output_event.event in [RunEvent.reasoning_started]:
            print(f"\nEVENT: {run_output_event.event}")

        if run_output_event.event in [RunEvent.reasoning_step]:
            print(f"\nEVENT: {run_output_event.event}")
            print(f"REASONING CONTENT: {run_output_event.reasoning_content}")  # type: ignore

        if run_output_event.event in [RunEvent.reasoning_completed]:
            print(f"\nEVENT: {run_output_event.event}")

        if run_output_event.event in [RunEvent.run_content]:
            if not content_started:
                print("\nCONTENT:")
                content_started = True
            else:
                print(run_output_event.content, end="")


# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    task = (
        "Analyze the key factors that led to the signing of the Treaty of Versailles in 1919. "
        "Discuss the political, economic, and social impacts of the treaty on Germany and how it "
        "contributed to the onset of World War II. Provide a nuanced assessment that includes "
        "multiple historical perspectives."
    )
    asyncio.run(
        run_agent_with_events(
            task,
        )
    )

Run the Example

# Clone and setup repo
git clone https://github.com/agno-agi/agno.git
cd agno/cookbook/02_agents/14_advanced

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

python reasoning_agent_events.py