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"""
Async Tool Decorator
=============================

Demonstrates async tool decorator.
"""

import asyncio
import json
from typing import AsyncIterator

import httpx
from agno.agent import Agent
from agno.tools import tool

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


@tool(show_result=True)
async def get_top_hackernews_stories(agent: Agent) -> AsyncIterator[str]:
    num_stories = agent.dependencies.get("num_stories", 5) if agent.dependencies else 5

    async with httpx.AsyncClient() as client:
        # Fetch top story IDs
        response = await client.get(
            "https://hacker-news.firebaseio.com/v0/topstories.json"
        )
        story_ids = response.json()

        # Yield story details
        for story_id in story_ids[:num_stories]:
            story_response = await client.get(
                f"https://hacker-news.firebaseio.com/v0/item/{story_id}.json"
            )
            story = story_response.json()
            if "text" in story:
                story.pop("text", None)
            yield json.dumps(story)


agent = Agent(
    dependencies={
        "num_stories": 2,
    },
    tools=[get_top_hackernews_stories],
    markdown=True,
)
# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    asyncio.run(
        agent.aprint_response("What are the top hackernews stories?", stream=True)
    )

​
Run the Example

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

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

python async_tool_decorator.py