MCP Codex CLI Installer

This skill installs the Codex CLI MCP server into the current project.

Installation Procedure

When the user asks to install Codex CLI MCP:

1. Check for existing .mcp.json in the project root
2. Merge configuration - Add this server to mcpServers:

{
  "codex-cli": {
    "command": "cmd",
    "args": ["/c", "npx", "-y", "codex-mcp-server"]
  }
}

3. If .mcp.json doesn't exist, create it with the full structure:

{
  "mcpServers": {
    "codex-cli": {
      "command": "cmd",
      "args": ["/c", "npx", "-y", "codex-mcp-server"]
    }
  }
}

Prerequisites

• Node.js and npm installed

Usage After Installation

Restart Claude Code to activate the MCP server.

Skill Chaining

• Input: User request to install Codex CLI MCP
• Output: Configured .mcp.json with codex-cli server
• Tools Used: Read, Edit, Write
• Chains With: Any code analysis workflow

Troubleshooting