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"""
Add Tool After Initialization
=============================

Demonstrates add tool after initialization.
"""

import random

from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.tools import tool

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


@tool(stop_after_tool_call=True)
def get_weather(city: str) -> str:
    """Get the weather for a city."""
    # In a real implementation, this would call a weather API
    weather_conditions = ["sunny", "cloudy", "rainy", "snowy", "windy"]
    random_weather = random.choice(weather_conditions)

    return f"The weather in {city} is {random_weather}."


agent = Agent(
    model=OpenAIChat(id="gpt-5.2"),
    markdown=True,
)

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    agent.print_response("What can you do?", stream=True)

    agent.add_tool(get_weather)

    agent.print_response("What is the weather in San Francisco?", stream=True)

​
Run the Example

# Clone and setup repo
git clone https://github.com/agno-agi/agno.git
cd agno/cookbook/91_tools/other

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

python add_tool_after_initialization.py