codex-mcp-rs

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A high-performance Rust implementation of MCP (Model Context Protocol) server that wraps the Codex CLI for AI-assisted coding tasks.

Features

• MCP Protocol Support: Implements the official Model Context Protocol using the Rust SDK
• Codex Integration: Wraps the Codex CLI to enable AI-assisted coding through MCP
• Session Management: Supports multi-turn conversations via session IDs
• Sandbox Safety: Configurable sandbox policies (read-only, workspace-write, danger-full-access)
• Smart Stdin Mode: Automatically pipes prompts via stdin when they contain special characters or exceed length limits, with force_stdin override
• Image Support: Attach images to prompts for visual context
• Async Runtime: Built on Tokio for efficient async I/O
• Cross-Platform: Pre-built binaries for Linux, macOS, and Windows (x64 and arm64)

Supported Platforms

Platform	Architecture	Binary
Linux	x86_64	codex-mcp-rs_Linux_x86_64.tar.gz
Linux	arm64	codex-mcp-rs_Linux_arm64.tar.gz
macOS	Universal (x64 + arm64)	codex-mcp-rs_Darwin_universal.tar.gz
Windows	x86_64	codex-mcp-rs_Windows_x86_64.zip
Windows	arm64	codex-mcp-rs_Windows_arm64.zip

Prerequisites

• Rust 1.77.2+ (required for Windows command-line argument escaping fixes)
• Codex CLI installed and configured
• Claude Code or another MCP client

Building

# Debug build
cargo build

# Release build
cargo build --release

Running

The server communicates via stdio transport:

cargo run

Or after building:

./target/release/codex-mcp-rs

Quick Start

The fastest way to get started is using npx:

npx @missdeer/codex-mcp-rs

This command automatically installs the correct pre-built binary for your platform (Windows/macOS/Linux, x64/arm64) and launches the MCP server. No manual installation required.

To add it to Claude Code:

claude mcp add codex-rs -s user --transport stdio -- npx @missdeer/codex-mcp-rs

Installation

Option 1: Use via npx (Recommended)

Using npx is the simplest approach - it handles binary installation automatically:

npx @missdeer/codex-mcp-rs

What happens:

1. npm installs the platform-specific binary package (@codex-mcp-rs/darwin-universal, @codex-mcp-rs/linux-x64, etc.)
2. Launches the MCP server on stdio transport

Add to Claude Code MCP configuration:

claude mcp add codex-rs -s user --transport stdio -- npx @missdeer/codex-mcp-rs

Or install globally for faster startup:

npm install -g @missdeer/codex-mcp-rs
claude mcp add codex-rs -s user --transport stdio -- codex-mcp-rs

Global installation caches the binary locally for instant startup.

Option 2: Install via Install Script (Linux/macOS)

Automatically download and install the latest release binary to /opt/codex-mcp-rs/:

curl -sSL https://raw.githubusercontent.com/missdeer/codex-mcp-rs/master/scripts/install.sh | bash

This script will:

• Detect your platform and architecture
• Download the latest release from GitHub
• Install the binary to /opt/codex-mcp-rs/codex-mcp-rs
• Automatically add it to your Claude Code MCP configuration

Option 3: Install from Release

Download the appropriate binary for your platform from the releases page, extract it, and add to your MCP configuration:

claude mcp add codex-rs -s user --transport stdio -- /path/to/codex-mcp-rs

Option 4: Build from Source

git clone https://github.com/missdeer/codex-mcp-rs.git
cd codex-mcp-rs
cargo build --release
claude mcp add codex-rs -s user --transport stdio -- $(pwd)/target/release/codex-mcp-rs

Tool Usage

The server provides a single codex tool with the following parameters:

Required Parameters

• PROMPT (string): Task instruction for Codex
• cd (string): Working directory path

Optional Parameters

• sandbox (string): Sandbox policy - "read-only" (default), "workspace-write", or "danger-full-access"
• SESSION_ID (string): Resume a previous session for multi-turn conversations
• skip_git_repo_check (bool): Allow running outside git repositories (default: false)
• return_all_messages (bool): Return full reasoning trace (default: false)
• image (array): Paths to image files to attach
• model (string): Override the Codex model
• yolo (bool): Disable all prompts and sandboxing
• profile (string): Load config profile from ~/.codex/config.toml
• timeout_secs (number): Timeout in seconds for codex execution (default: 600, max: 3600)
• force_stdin (bool): Force passing prompt via stdin instead of CLI argument (default: false). When enabled, the prompt is always piped through stdin regardless of content. This is also triggered automatically when the prompt exceeds 800 characters or contains shell-special characters.

Testing

The project has comprehensive test coverage:

# Run all tests
cargo test

# Run with coverage
cargo tarpaulin --out Html

# See detailed testing guide
cat TESTING.md

Test categories:

• Unit tests (10): Core functionality (escape_prompt, Options)
• Integration tests (10): End-to-end scenarios
• Server tests (5): MCP protocol implementation
• CI tests: Multi-platform validation

Total: 25 tests passing ✅

Current test coverage: See Codecov

Architecture

See CLAUDE.md for detailed architecture documentation.

Comparison with Other Implementations

Feature	codex-mcp-rs (Rust)	codexmcp (Python)	codex-mcp-go
Language	Rust	Python	Go
Performance	⭐⭐⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐
Memory Usage	⭐⭐⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐
Binary Size	Medium	N/A	Small
Startup Time	⭐⭐⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐⭐
Session Management	✓	✓	✓
Image Support	✓	✓	✓
Sandbox Policies	✓	✓	✓

Related Projects

• codex-mcp-go - Go implementation
• geminimcp - Python MCP server for Gemini CLI

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

License

This project is dual-licensed:

Non-Commercial / Personal Use - GNU General Public License v3.0

Free for personal projects, educational purposes, open source projects, and non-commercial use. See LICENSE for the full GPLv3 license text.

Commercial / Workplace Use - Commercial License Required

If you use codex-mcp-rs in a commercial environment, workplace, or for any commercial purpose, you must obtain a commercial license.

This includes but is not limited to:

• Using the software at work (any organization)
• Integrating into commercial products or services
• Using for client work or consulting
• Offering as part of a SaaS/cloud service

Contact: missdeer@gmail.com for commercial licensing inquiries.

See LICENSE-COMMERCIAL for more details.

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