xAI MCP Server

A Model Context Protocol (MCP) server that brings xAI's Grok APIs to Claude Code. Generate images, chat with Grok, analyze images, search the web, and create videos—all from natural language prompts in your Claude Code session.

Features

| Tool | Description | |------|-------------| | generate_image | Generate images using Grok Imagine | | chat | Chat with Grok models (grok-3, grok-4, grok-3-mini) | | analyze_image | Analyze and describe images with Grok Vision | | live_search | Real-time web, news, and X/Twitter search | | generate_video | Generate videos from text prompts |

Prerequisites

• Node.js 18.0.0 or higher
• xAI API Key from x.ai/api
• Claude Code installed

Installation

Option 1: Quick Install (Recommended)

curl -fsSL https://raw.githubusercontent.com/joemccann/xai-mcp-server/main/install.sh | bash

This installs the server and automatically configures Claude Code. You'll be prompted for your xAI API key.

Option 2: npx from GitHub

No installation needed - runs directly from GitHub:

npx github:joemccann/xai-mcp-server

Option 3: npm Global Install

npm install -g @joemccann/xai-mcp-server

Option 4: Clone and Build

git clone https://github.com/joemccann/xai-mcp-server.git
cd xai-mcp-server
npm install

Configuration for Claude Code

Step 1: Get Your xAI API Key

1. Go to x.ai/api
2. Sign up or log in
3. Create an API key
4. Copy the key (starts with xai-)

Step 2: Configure Claude Code

Note: If you used the Quick Install (Option 1), this is already done for you.

Add the MCP server using the Claude CLI:

claude mcp add xai -e XAI_API_KEY=xai-your-key-here -- node ~/.xai-mcp-server/dist/index.js

For nvm users, use the absolute path to node:

claude mcp add xai -e XAI_API_KEY=xai-your-key-here -- $(which node) ~/.xai-mcp-server/dist/index.js

Verify it's configured:

claude mcp list

You should see:

xai: ... - ✓ Connected

Step 3: Restart Claude Code

Restart Claude Code to load the new MCP server. You should see the xAI tools available.

Usage

Once configured, you can use natural language to invoke xAI capabilities:

Image Generation

Generate an image of a cyberpunk cityscape at night with neon lights.

Using grok imagine, create a watercolor painting of a mountain landscape.

Generate 3 variations of a logo for a coffee shop called "Bean There".

Chat with Grok

Ask Grok to explain the theory of relativity in simple terms.

Have Grok write a haiku about programming.

Image Analysis

Analyze this image and describe what you see: https://example.com/photo.jpg

What text is visible in this screenshot: [image URL]

Live Search

Search for the latest news about SpaceX launches.

Find recent tweets about the new iPhone release.

Search the web for Python best practices 2024.

Video Generation

Generate a 5-second video of clouds moving across a blue sky.

Create a video animation of a bouncing ball.

Tool Reference

generate_image

Generate images from text descriptions using Grok Imagine.

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | prompt | string | Yes | - | Text description of the image | | n | number | No | 1 | Number of images (1-10) | | model | string | No | grok-2-image-1212 | Image generation model | | aspect_ratio | string | No | - | Aspect ratio (e.g., "16:9", "1:1", "4:3") | | response_format | string | No | url | Output format: "url" or "b64_json" |

Example Response:

{
  "success": true,
  "images": [
    {
      "index": 1,
      "url": "https://api.x.ai/images/generated/abc123.png",
      "revised_prompt": "A detailed cyberpunk cityscape..."
    }
  ]
}

chat

Chat with Grok language models.

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | message | string | Yes | - | Message to send to Grok | | model | string | No | grok-3 | Model: grok-3, grok-4, grok-3-mini | | system_prompt | string | No | - | System context/instructions | | temperature | number | No | 0.7 | Sampling temperature (0-2) | | max_tokens | number | No | - | Maximum response tokens |

analyze_image

Analyze images using Grok's vision capabilities.

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | image_url | string | Yes | - | Image URL or base64 data URL | | prompt | string | No | "Describe this image" | Question or instruction | | detail | string | No | auto | Detail level: "low", "high", "auto" | | model | string | No | grok-2-vision-1212 | Vision model |

live_search

Perform real-time web searches using Grok.

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | query | string | Yes | - | Search query | | sources | array | No | ["web"] | Sources: "web", "news", "x" | | date_range | object | No | - | Date filter: { start, end } (YYYY-MM-DD) | | max_results | number | No | 10 | Maximum results (1-20) |

generate_video

Generate videos from text descriptions.

| Parameter | Type | Required | Default | Description | |-----------|------|----------|---------|-------------| | prompt | string | Yes | - | Video description | | model | string | No | grok-imagine-video | Video generation model | | duration | number | No | 5 | Duration in seconds (1-15) | | image | string | No | - | Input image URL to animate | | video | string | No | - | Input video URL to edit | | aspect_ratio | string | No | - | Aspect ratio (e.g., "16:9") | | wait_for_completion | boolean | No | true | Wait for video to finish |

Development

# Install dependencies
npm install

# Build TypeScript
npm run build

# Watch mode (rebuild on changes)
npm run dev

# Run the server directly
npm start

Testing

This project includes comprehensive unit tests with pretty table output:

# Run unit tests (mocked, no API calls)
npm run test

# Run tests with detailed output (shows every individual test)
npm run test:detailed

# Run tests in watch mode
npm run test:watch

# Run tests with coverage report
npm run test:coverage

# Run integration tests (requires XAI_API_KEY, makes real API calls)
npm run test:integration

Test Output Features:

• Color-coded results with status indicators (✓ PASS, ✗ FAIL)
• Performance metrics showing slowest/fastest test files
• Summary table with total stats
• Detailed mode shows individual test durations and suite hierarchy
• All tests use mocked APIs by default (no cost, no API key needed)

Project Structure

xai-mcp-server/
├── src/
│   ├── index.ts           # MCP server entry point
│   ├── xai-client.ts      # xAI API client with types
│   └── tools/
│       ├── generate-image.ts
│       ├── chat.ts
│       ├── vision.ts
│       ├── live-search.ts
│       └── generate-video.ts
├── dist/                  # Compiled JavaScript
├── package.json
├── tsconfig.json
└── README.md

Troubleshooting

"XAI_API_KEY environment variable is required"

Re-add the MCP server with your API key:

claude mcp remove xai
claude mcp add xai -e XAI_API_KEY=xai-your-key-here -- $(which node) ~/.xai-mcp-server/dist/index.js

Tools not appearing in Claude Code

1. Run claude mcp list to check server status
2. If not listed, add it with claude mcp add (see Step 2 above)
3. For nvm users, use absolute node path: $(which node)
4. Ensure the project is built (npm run build)
5. Restart Claude Code completely

API errors

• Verify your API key is valid at x.ai
• Check you have sufficient API credits
• Some features may require specific API tier access

API Reference

This server uses the xAI API. For full API documentation, see:

• xAI API Reference
• Image Generation Guide

License

MIT

Contributing

Contributions welcome! Please open an issue or submit a pull request.

Acknowledgments

• xAI for the Grok API
• Model Context Protocol for the MCP specification
• Anthropic for Claude Code