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"""
Basic Reasoning Stream
======================

Demonstrates this reasoning cookbook example.
"""

from agno.agent import Agent
from agno.models.google import Gemini
from agno.run.agent import RunEvent  # noqa


# ---------------------------------------------------------------------------
# Create Example
# ---------------------------------------------------------------------------
def run_example() -> None:
    # Create an agent with reasoning enabled
    # Note: For Gemini, you MUST set thinking_budget to enable thinking mode
    agent = Agent(
        reasoning_model=Gemini(
            id="gemini-2.5-flash",
            thinking_budget=1024,  # Required to enable thinking mode
            include_thoughts=True,  # Include thought summaries in response
        ),
        reasoning=True,
        instructions="Think step by step about the problem.",
    )

    prompt = "What is 25 * 37? Show your reasoning."

    agent.print_response(prompt, stream=True, stream_events=True)

    # # Use manual event loop to see all events
    # async for run_output_event in agent.arun(
    #     prompt,
    #     stream=True,
    #     stream_events=True,
    # ):
    #     if run_output_event.event == RunEvent.run_started:
    #         print(f"\nEVENT: {run_output_event.event}")

    #     elif run_output_event.event == RunEvent.reasoning_started:
    #         print(f"\nEVENT: {run_output_event.event}")
    #         print("Reasoning started...\n")

    #     elif run_output_event.event == RunEvent.reasoning_content_delta:
    #         # This is the NEW streaming event for reasoning content
    #         print(run_output_event.reasoning_content, end="", flush=True)

    #     elif run_output_event.event == RunEvent.reasoning_step:
    #         print(f"\nEVENT: {run_output_event.event}")

    #     elif run_output_event.event == RunEvent.reasoning_completed:
    #         print(f"\n\nEVENT: {run_output_event.event}")

    #     elif run_output_event.event == RunEvent.run_content:
    #         if run_output_event.content:
    #             print(run_output_event.content, end="", flush=True)

    #     elif run_output_event.event == RunEvent.run_completed:
    #         print(f"\n\nEVENT: {run_output_event.event}")


# ---------------------------------------------------------------------------
# Run Example
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    run_example()

​
Run the Example

# Clone and setup repo
git clone https://github.com/agno-agi/agno.git
cd agno/cookbook/10_reasoning/models/gemini

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

python basic_reasoning_stream.py