Kagi MCP (Node.js)

A Node.js implementation of the Kagi Model Context Protocol (MCP) server. This provides a more stable alternative to the official Python implementation, especially when running multiple instances.

Features

• Search web content using Kagi Search API
• Summarize documents, videos, and audio using Kagi Summarizer API
• No port conflicts when running multiple instances
• Full compatibility with Claude Desktop

Prerequisites

• Node.js 18 or higher
• Kagi API key (request from support@kagi.com)
• Note: The Search API is in closed beta. You may need to request access separately.

Installation

Method 1: Using npx (Recommended for Claude Desktop)

No installation needed! Claude Desktop can run the package directly using npx.

Method 2: Install from npm

npm install -g kagi-mcp

Or use it directly with npx:

npx kagi-mcp

Method 3: Install from GitHub directly

npm install -g github:yuki-yano/kagi-mcp

Method 4: Install from source

git clone https://github.com/yuki-yano/kagi-mcp.git
cd kagi-mcp
npm install
npm run build
npm link

Configuration

Environment Variables

• KAGI_API_KEY (required): Your Kagi API key
• KAGI_SUMMARIZER_ENGINE (optional): Summarization engine - cecil (default), agnes, daphne, or muriel

Claude Desktop Configuration

Add the following to your Claude Desktop config file:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

Method 1: Using npx (Recommended - No installation required)

{
  "mcpServers": {
    "kagi": {
      "command": "npx",
      "args": ["kagi-mcp"],
      "env": {
        "KAGI_API_KEY": "your-kagi-api-key"
      }
    }
  }
}

This method automatically downloads and runs the latest version from npm without requiring manual installation.

Method 2: Using globally installed package

{
  "mcpServers": {
    "kagi": {
      "command": "kagi-mcp",
      "env": {
        "KAGI_API_KEY": "your-kagi-api-key"
      }
    }
  }
}

Claude Code Configuration

To use with Claude Code CLI, run the following command:

claude mcp add kagi -s user -e KAGI_API_KEY="your-kagi-api-key" -- npx kagi-mcp

This will:

• Add the Kagi MCP server to your Claude Code configuration
• Set it up at the user level (-s user)
• Configure your API key as an environment variable
• Use npx to automatically download and run the latest version from npm

You can also use the MCP inspector for debugging:

# Method 1: Using npx (requires npm package to be published)
KAGI_API_KEY="your-kagi-api-key" npx @modelcontextprotocol/inspector npx kagi-mcp

# Method 2: Using local installation (more reliable)
npm install -g kagi-mcp
KAGI_API_KEY="your-kagi-api-key" npx @modelcontextprotocol/inspector kagi-mcp

# Method 3: Using source build
KAGI_API_KEY="your-kagi-api-key" npx @modelcontextprotocol/inspector node dist/index.js

Usage

The MCP server provides two tools:

kagi_search_fetch

Search the web using Kagi Search API.

{
  "queries": ["array of search queries"]
}

kagi_summarizer

Summarize content from a URL.

{
  "url": "https://example.com/article",
  "summary_type": "summary" | "takeaway",  // optional
  "target_language": "EN"  // optional
}

Development

# Install dependencies
npm install

# Run in development mode
npm run dev

# Build
npm run build

# Run built version
npm start

Troubleshooting

"Malformed authorization token" error

This error indicates that your API key is invalid or not properly formatted. Make sure:

• You have a valid Kagi API key from support@kagi.com
• The key is correctly set in your environment variable
• You're not adding extra quotes or spaces around the key

"401 Unauthorized" error for Search API

The Search API is in closed beta. You may need to:

1. Request access to the Search API separately from support@kagi.com
2. Ensure your API key has the necessary permissions

Testing your API key

You can test your API key using the included test script:

KAGI_API_KEY="your-api-key" node test-api.js

License

MIT