claude-co-commands

Claude Co-Commands Plugin

3 collaboration commands for Claude Code that use the Codex CLI to generate parallel plans, validate plans, and brainstorm ideas.

Commands

Prerequisites

- Claude Code
- The Codex CLI, signed in:

No MCP server is needed. The skills run Codex through a small helper, scripts/codex-session,
which drives codex exec in Codex's read-only sandbox and keeps each conversation in a temporary
folder so follow-ups continue the same Codex session. A background subagent starts Codex and
answers any clarifying questions it asks, while Claude does its own independent work.

Installation

Option 1: Plugin Marketplace (Recommended)

Option 2: Git Clone

Option 3: Manual Copy

Copy plugins/co-commands/skills/ contents to ~/.claude/skills/.

Upgrading from 1.x

Versions 1.x used the Codex MCP server (codex mcp-server). OpenAI removed that command in
Codex 0.154.0, so the server now exits at startup and Claude Code reports
validate-plans-and-brainstorm-ideas ... Connection closed. Version 2.0 does not use it.
Remove the old server entry from wherever you added it:

Verify

1. Run codex login status; it should say you are logged in.
2. Restart Claude Code after updating the plugin.
3. Test with /co-brainstorm test idea. It should spawn a background subagent that runs codex-session run.

Command Details

/co-brainstorm

Starts an interactive brainstorming session with Codex. Pass your topic or question as the argument.

Supports follow-up conversation to dig deeper into ideas.

/co-plan

Generates an alternative plan in the background while you continue your own planning. Pass your task description as the argument.

Compare the Codex plan against yours to catch missed approaches, simpler alternatives, or overlooked edge cases.

/co-validate

Sends your plan to…