What ACP is in Rig
Agent Client Protocol: how an editor talks to a coding agent — JSON-RPC over stdio (or HTTP/WebSocket for remote agents).
Idea
Zed published ACP so any agent can plug into any ACP-capable editor. The editor owns the file tree and UI; the agent streams messages and tool calls. Rig’s cloud ACP agent answers fleet questions (status, devices, Mesh, tickets) — it does not replace a coding agent.
Not MCP
MCP is agent ↔ tools (Rig’s local hub). ACP is editor ↔ agent. You can run both: ACP in Zed for Rig Cloud context, MCP in Cursor for local projects.