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openclaw - 💡(How to fix) Fix Support Agent Client Protocol (ACP) as a coding agent integration

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OpenAI Codex CLI exposes itself as an MCP server (codex mcp-server), allowing other agent frameworks to use it as a tool. GitHub Copilot CLI has a similar but different capability via --acp (Agent Client Protocol).

ACP is an open standard (JSON-RPC 2.0 over stdio/HTTP/WebSocket) that standardizes communication between editors/clients and AI coding agents - like LSP but for coding agents. See https://agentclientprotocol.com

Root Cause

  • ACP is agent-agnostic: Claude Code, Codex, Copilot CLI, Qwen, Gemini, OpenCode, Kiro, and others already support it
  • A single ACP client in OpenClaw would let users plug in any ACP-compatible coding agent as an interchangeable subagent
  • Users on different subscriptions (GitHub Copilot $10/mo, ChatGPT Plus $20/mo, etc.) could use whichever coding agent their plan includes
  • There is already a VS Code ACP client extension (vscode-acp) listing OpenClaw as a supported agent, suggesting community interest
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Summary

OpenAI Codex CLI exposes itself as an MCP server (codex mcp-server), allowing other agent frameworks to use it as a tool. GitHub Copilot CLI has a similar but different capability via --acp (Agent Client Protocol).

ACP is an open standard (JSON-RPC 2.0 over stdio/HTTP/WebSocket) that standardizes communication between editors/clients and AI coding agents - like LSP but for coding agents. See https://agentclientprotocol.com

Why this matters

  • ACP is agent-agnostic: Claude Code, Codex, Copilot CLI, Qwen, Gemini, OpenCode, Kiro, and others already support it
  • A single ACP client in OpenClaw would let users plug in any ACP-compatible coding agent as an interchangeable subagent
  • Users on different subscriptions (GitHub Copilot $10/mo, ChatGPT Plus $20/mo, etc.) could use whichever coding agent their plan includes
  • There is already a VS Code ACP client extension (vscode-acp) listing OpenClaw as a supported agent, suggesting community interest

Proposed integration

  1. ACP client support: OpenClaw spawns an ACP-compatible agent (e.g. copilot --acp, codex mcp-server) and communicates via JSON-RPC over stdio
  2. Tool exposure: ACP agents appear as tools/subagents that OpenClaw can delegate coding tasks to
  3. Config: users configure which ACP agent binary to use (copilot, codex, claude, etc.)

Comparison

ProtocolDirectionPurposeExample
MCPAgent consumes toolsConnect external tools to an agentcodex mcp-server
ACPClient consumes agentConnect a coding agent to a client/orchestratorcopilot --acp

References

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#ssr#cache issue#memory leak#API versioning#request timeout

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openclaw - 💡(How to fix) Fix Support Agent Client Protocol (ACP) as a coding agent integration