External Tool Execution Async

Execute tools outside the agent in an async environment. You control tool execution externally while the agent handles the rest of the run.

Create a Python file

external_tool_execution_async.py
import asyncio
import shlex
import subprocess

from agno.agent import Agent
from agno.db.sqlite import SqliteDb
from agno.models.openai import OpenAIResponses
from agno.tools import tool
from agno.utils import pprint


# We have to create a tool with the correct name, arguments and docstring for the agent to know what to call.
@tool(external_execution=True)
def execute_shell_command(command: str) -> str:
    """Execute a shell command.

    Args:
        command (str): The shell command to execute

    Returns:
        str: The output of the shell command
    """
    if shlex.split(command) in (["ls"], ["ls", "-a"], ["ls", "-l"], ["ls", "-la"]):
        return subprocess.check_output(shlex.split(command), timeout=10).decode("utf-8")
    else:
        raise Exception(f"Unsupported command: {command}")


agent = Agent(
    model=OpenAIResponses(id="gpt-5.2"),
    tools=[execute_shell_command],
    markdown=True,
    db=SqliteDb(session_table="test_session", db_file="tmp/example.db"),
)

async def main():
    run_response = await agent.arun('What files do I have in my current directory?')
    if run_response.is_paused:
        for requirement in run_response.active_requirements:
            if requirement.needs_external_execution:
                if requirement.tool_execution.tool_name == execute_shell_command.name:
                    print(f'Executing {requirement.tool_execution.tool_name} with args {requirement.tool_execution.tool_args} externally')
                    result = execute_shell_command.entrypoint(**requirement.tool_execution.tool_args)
                    requirement.set_external_execution_result(result)
        run_response = await agent.acontinue_run(run_id=run_response.run_id, requirements=run_response.requirements)
        pprint.pprint_run_response(run_response)

asyncio.run(main())

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate

Install dependencies

uv pip install -U agno openai sqlalchemy

Export your OpenAI API key

  export OPENAI_API_KEY="your_openai_api_key_here"

Run Agent

python external_tool_execution_async.py