Codex MCP Server: Bridge Claude Code with OpenAI Codex CLI

Introduction

The codex-mcp-server project provides a crucial link, enabling Claude Code to tap into the robust AI capabilities of OpenAI's Codex CLI. This server wrapper acts as a bridge, bringing AI-powered code analysis, generation, and review directly into your development workflow. It simplifies the integration, allowing developers to enhance their coding experience with advanced AI assistance.

Installation

To get started with codex-mcp-server, follow these simple steps:

1. Install Codex CLI

First, ensure you have the OpenAI Codex CLI installed globally and authenticated:

npm i -g @openai/codex
codex login --api-key "your-openai-api-key"

2. Add to Claude Code

Next, integrate the codex-mcp-server into Claude Code using the claude mcp add command:

claude mcp add codex-cli -- npx -y codex-mcp-server

For a one-click installation experience, you can also use the provided links for VS Code, VS Code Insiders, and Cursor:

• VS Code Install
• VS Code Insiders Install
• Cursor Install

Examples

Once installed, you can start leveraging Codex's AI capabilities through Claude Code. Here are some common ways to interact with it:

Basic Usage

Ask codex to explain this function
Use codex to refactor this code for better performance
Use review to check my uncommitted changes

Code Analysis

Use codex to analyze this authentication logic for security issues

Multi-turn Conversations

codex-mcp-server supports multi-turn conversations using session IDs, allowing you to maintain context across multiple interactions:

Use codex with sessionId "refactor" to analyze this module
Use codex with sessionId "refactor" to implement your suggestions

Code Review

Perform AI-powered code reviews on uncommitted changes, branches, or commits:

Use review with base "main" to check my PR changes
Use review with uncommitted true to review my local changes

Web Search

Utilize the websearch tool to perform web searches directly:

Use websearch with query "TypeScript 5.8 new features"
Use websearch with query "Rust vs Go performance 2025" and numResults 15

Why Use Codex MCP Server?

Integrating codex-mcp-server into your development environment offers significant advantages. It empowers developers with on-demand AI assistance for complex tasks like code analysis, refactoring, and security checks. The ability to conduct multi-turn conversations and perform AI-powered code reviews streamlines workflows and enhances code quality. By bridging Claude Code with OpenAI Codex, this project brings cutting-edge AI directly to your fingertips, boosting productivity and enabling more efficient development.

Links

For more detailed information and to contribute to the project, visit the official repository:

• GitHub Repository
• npm Package