**Seamlessly Bridge Claude Code and Codex**
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English | [简体中文](../README.md)
---
## I. Introduction
In today's AI-assisted programming landscape, **Claude Code** excels at architectural design and high-level thinking, while **Codex** demonstrates exceptional prowess in code generation and granular optimization. **CodexMCP** serves as the bridge between them, leveraging the MCP protocol to create powerful synergies:
- **Claude Code**: Requirements analysis, architectural planning, code refactoring
- **Codex**: Algorithm implementation, bug localization, code review
- **CodexMCP**: Session context management, multi-turn conversations, parallel task execution
Compared to the official Codex MCP implementation, CodexMCP introduces enterprise-grade features including **session persistence**, **parallel execution**, and **reasoning trace tracking**, enabling smarter and more efficient collaboration between AI programming assistants. Feature comparison at a glance:
| Feature | Official Version | CodexMCP |
|---------|------------------|----------|
| Basic Codex Invocation | √ | √ |
| Multi-turn Conversations | × | √ |
| Reasoning Detail Tracking | × | √ |
| Parallel Task Support | × | √ |
| Error Handling | × | √ |
---
## II. Quick Start
### 0. Prerequisites
Please ensure you have successfully **installed** and **configured** both Claude Code and Codex.
- [Claude Code Installation Guide](https://docs.claude.com/docs/claude-code)
- [Codex CLI Installation Guide](https://developers.openai.com/codex/quickstart)
### 1. Installation Steps
**1.1** Remove the official Codex MCP (if previously installed).
```bash
claude mcp remove codex
```
**1.2** Install CodexMCP.
```bash
claude mcp add codex -s user --transport stdio -- uvx --from git+https://github.com/GuDaStudio/codexmcp.git codexmcp
```
**1.3** Verify the installation. Run in your **terminal**:
```
claude mcp list
```
> [!IMPORTANT]
> If you see the following output, installation was successful!
> `codex: uvx --from git+https://github.com/GuDaStudio/codexmcp.git codexmcp - ✓ Connected`
### 2. Configure Claude Code Prompts (Optional)
To optimize Claude Code's collaboration with Codex, we **highly recommend adding the following to `~/.claude/CLAUDE.md`**
Expand to view prompt
```
## Core Instruction for CodeX MCP
At all times, you must consider how to collaborate with Codex during your current process, and how to invoke the Codex MCP tools as a safeguard for your objective and comprehensive analysis.
You **must execute** the following steps:
**1** After forming an initial analysis of the user's requirements, inform Codex of the user's needs and your preliminary approach, and ask it to refine the requirements analysis and implementation plan.
**2** Before implementing specific coding tasks, **you must request a code implementation prototype from Codex (require Codex to provide only a unified diff patch, strictly prohibiting any actual code modifications)**. After obtaining the code prototype, you **may only use it as a logical reference and must rewrite the code modifications**, creating enterprise-grade, highly readable, and highly maintainable code before executing the actual programming modification tasks.
**3** Whenever you complete actual coding actions, **you must immediately use Codex to review the code changes and the degree of requirement completion**.
**4** Codex can only provide references; you **must have your own thinking and even need to question Codex's answers**. "Reading books without thinking is worse than not reading" — your ultimate mission with Codex is to reach unified, comprehensive, and precise conclusions, so you must continuously debate to find the only path to truth.
## Codex Tool Invocation Specification
1. Tool Overview
Codex MCP provides a tool named `codex` for executing AI-assisted coding tasks. This tool **is invoked via the MCP protocol**, not via command line.
2. Tool Parameters
**Required** parameters:
- PROMPT (string): Task instruction sent to Codex
- cd (Path): Root path of the working directory for Codex execution
Optional parameters:
- sandbox (string): Sandbox policy, options:
- "read-only" (default): Read-only mode, safest
- "workspace-write": Allow writes within workspace
- "danger-full-access": Full access permissions
- SESSION_ID (UUID | null): For continuing previous sessions to enable multi-turn interactions with Codex, defaults to None (start new session)
- skip_git_repo_check (boolean): Whether to allow running in non-Git repositories, defaults to False
- return_all_messages (boolean): Whether to return all messages (including reasoning, tool calls, etc.), defaults to False
Return value:
{
"success": true,
"SESSION_ID": "uuid-string",
"agent_messages": "agent's text response",
"all_messages": [] // Only included when return_all_messages=True
}
Or on failure:
{
"success": false,
"error": "error message"
}
3. Usage Methods
Starting a new conversation:
- Don't pass SESSION_ID parameter (or pass None)
- Tool will return a new SESSION_ID for subsequent conversations
Continuing a previous conversation:
- Pass the previously returned SESSION_ID as parameter
- Context from the same session will be preserved
4. Invocation Standards
**Must comply**:
- Every time you call the Codex tool, you must save the returned SESSION_ID for subsequent conversations
- The cd parameter must point to an existing directory, otherwise the tool will fail silently
- Strictly prohibit Codex from making actual code modifications; use sandbox="read-only" to prevent accidents, and require Codex to provide only unified diff patches
Recommended usage:
- If detailed tracking of Codex's reasoning process and tool calls is needed, set return_all_messages=True
- For precise location, debugging, rapid code prototyping, and similar tasks, prioritize using the Codex tool
5. Notes
- Session management: Always track SESSION_ID to avoid session confusion
- Working directory: Ensure the cd parameter points to a correct and existing directory
- Error handling: Check the success field in return values and handle possible errors
```
---
## III. Tool Documentation
Click to view codex tool parameter documentation
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| `PROMPT` | `str` | ✅ | - | Task instruction sent to Codex |
| `cd` | `Path` | ✅ | - | Codex working directory root path |
| `sandbox` | `Literal` | ❌ | `"read-only"` | Sandbox policy: `read-only` / `workspace-write` / `danger-full-access` |
| `SESSION_ID` | `UUID \| None` | ❌ | `None` | Session ID (None starts new session) |
| `skip_git_repo_check` | `bool` | ❌ | `False` | Whether to allow running in non-Git repositories |
| `return_all_messages` | `bool` | ❌ | `False` | Whether to return complete reasoning information |
Click to view codex tool return value structure
**On success:**
```json
{
"success": true,
"SESSION_ID": "550e8400-e29b-41d4-a716-446655440000",
"agent_messages": "Codex's response content...",
"all_messages": [...] // Only included when return_all_messages=True
}
```
**On failure:**
```json
{
"success": false,
"error": "error message description"
}
```
---
## IV. FAQ
Q1: Are there any additional fees?
**CodexMCP itself is completely free and open source — no additional fees required!**
Q2: Will parallel calls conflict?
No. Each call uses an independent `SESSION_ID`, ensuring complete isolation.
---
## 🤝 Contributing
We welcome all forms of contribution!
### Development Environment Setup
```bash
# Clone the repository
git clone https://github.com/GuDaStudio/codexmcp.git
cd codexmcp
# Install dependencies
uv sync
```
### Commit Guidelines
- Follow [Conventional Commits](https://www.conventionalcommits.org/)
- Include test cases
- Update documentation
---
## 📄 License
This project is licensed under the [MIT License](LICENSE).
Copyright (c) 2025 [guda.studio](mailto:gudaclaude@gmail.com)
---
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