acpx is a headless CLI client for stateful Agent Client Protocol (ACP) sessions, enabling AI agents to communicate with coding agents like Pi, OpenClaw, Codex, and Claude via structured protocol instead of PTY scraping.

It supports persistent per-repo sessions, named parallel workstreams, prompt queueing, cooperative cancel, crash reconnect, and session controls. Install via npm install -g acpx@latest or npx, with auto-downloaded adapters for agents.