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🚀 IMPORTANT UPDATE

ACP is now part of A2A under the Linux Foundation!👉 Learn more | 🛠️ Migration Guide
This guide will walk you through using the Agent Communication Protocol (ACP) to create and run your first agent, interact with it using HTTP requests, and build a basic client.
This guide uses uv. See the uv primer for more details.
1

Initialize your project

uv init --python '>=3.11' my_acp_project
cd my_acp_project
2

Add the ACP SDK

uv add acp-sdk
3

Create an agent

Let’s create a simple “echo agent” that returns any message it receives. Create an agent.py file in your project directory with the following code:
agent.py
import asyncio
from collections.abc import AsyncGenerator

from acp_sdk.models import Message
from acp_sdk.server import Context, RunYield, RunYieldResume, Server

server = Server()


@server.agent()
async def echo(
    input: list[Message], context: Context
) -> AsyncGenerator[RunYield, RunYieldResume]:
    """Echoes everything"""
    for message in input:
        await asyncio.sleep(0.5)
        yield {"thought": "I should echo everything"}
        await asyncio.sleep(0.5)
        yield message


server.run()
4

Start the ACP server

uv run agent.py
Your server should now be running at http://localhost:8000.
5

Verify your agent is available

In another terminal, run the following curl command:
curl http://localhost:8000/agents
You should see a JSON response containing your echo agent, confirming it’s available.
6

Run the agent via HTTP

curl -X POST http://localhost:8000/runs \
  -H "Content-Type: application/json" \
  -d '{
        "agent_name": "echo",
        "input": [
          {
            "role": "user",
            "parts": [
              {
                "content": "Howdy!",
                "content_type": "text/plain"
              }
            ]
          }
        ]
      }'
Your response should include the echoed message “Howdy!”.
7

Build an ACP client

Here’s a simple ACP client to interact with your echo agent. Create a client.py file in your project directory with the following code:
client.py
import asyncio

from acp_sdk.client import Client
from acp_sdk.models import Message, MessagePart


async def example() -> None:
    async with Client(base_url="http://localhost:8000") as client:
        run = await client.run_sync(
            agent="echo",
            input=[
                Message(
                    parts=[MessagePart(content="Howdy to echo from client!", content_type="text/plain")]
                )
            ],
        )
        print(run.output)


if __name__ == "__main__":
    asyncio.run(example())
8

Run the ACP client

uv run client.py
You should see the echoed response printed to your console. 🎉
Now that you’re up and running, explore Example Agents, Core Concepts, or browse the full API Reference.