agent-client-protocol 0.0.1

A Python implement of Agent Client Protocol (ACP, by Zed Industries)

Agent Client Protocol (Python)

A Python implementation of the Agent Client Protocol (ACP). Use it to build agents that communicate with ACP-capable clients (e.g. Zed) over stdio.

• Package name: agent-client-protocol (import as acp)
• Repository: https://github.com/psiace/agent-client-protocol-python
• Docs: https://psiace.github.io/agent-client-protocol-python/

Install

pip install agent-client-protocol
# or
uv add agent-client-protocol

Development (contributors)

make install   # set up venv
make check     # lint + typecheck
make test      # run tests

Minimal agent example

# agent_main.py
import asyncio
from acp import Agent, AgentSideConnection, Client, InitializeRequest, InitializeResponse, PromptRequest, PromptResponse, SessionNotification, stdio_streams, PROTOCOL_VERSION
from acp.schema import ContentBlock1, SessionUpdate2

class EchoAgent(Agent):
    def __init__(self, client: Client) -> None:
        self.client = client

    async def initialize(self, _p: InitializeRequest) -> InitializeResponse:
        return InitializeResponse(protocolVersion=PROTOCOL_VERSION)

    async def prompt(self, p: PromptRequest) -> PromptResponse:
        text = "".join([getattr(b, "text", "") for b in p.prompt if getattr(b, "type", None) == "text"]) or "(empty)"
        await self.client.sessionUpdate(SessionNotification(
            sessionId=p.sessionId,
            update=SessionUpdate2(sessionUpdate="agent_message_chunk", content=ContentBlock1(type="text", text=f"Echo: {text}")),
        ))
        return PromptResponse(stopReason="end_turn")

async def main() -> None:
    reader, writer = await stdio_streams()
    AgentSideConnection(lambda c: EchoAgent(c), writer, reader)
    await asyncio.Event().wait()

if __name__ == "__main__":
    asyncio.run(main())

Run this executable from your ACP-capable client (e.g. configure Zed to launch it). The library takes care of the stdio JSON-RPC transport.

Example: Mini SWE Agent bridge

A minimal ACP bridge for mini-swe-agent is provided under examples/mini_swe_agent. It demonstrates:

• Parsing a prompt from ACP content blocks
• Streaming agent output via session/update
• Mapping command execution to tool_call and tool_call_update

Documentation

• Quickstart: docs/quickstart.md
• Mini SWE Agent example: docs/mini-swe-agent.md