MCP Google Custom Search Server

A Model Context Protocol (MCP) server that provides web search capabilities through Google's Custom Search API. This server enables Language Learning Models (LLMs) to perform web searches using a standardized interface.

🌟 Features

• Seamless integration with Google Custom Search API
• Model Context Protocol (MCP) compliant server implementation
• Type-safe implementation using TypeScript
• Environment variable configuration
• Input validation using Zod
• Configurable search results (up to 10 per query)
• Formatted search results including titles, URLs, and descriptions
• Error handling and validation
• Compatible with Claude Desktop and other MCP clients

📋 Prerequisites

Before you begin, ensure you have:

1. A Google Cloud Project with Custom Search API enabled

2. Visit Google Cloud Console

3. Enable the Custom Search API

4. Create API credentials

5. A Custom Search Engine ID

6. Visit Programmable Search Engine

7. Create a new search engine

8. Get your Search Engine ID

9. Local development requirements:

10. Node.js (v18 or higher)
11. npm (comes with Node.js)

🚀 Quick Start

1. Clone the repository:

bash git clone https://github.com/limklister/mcp-google-custom-search-server.git cd mcp-google-custom-search-server

1. Install dependencies:

bash npm install

1. Create a .env file:

bash GOOGLE_API_KEY=your-api-key GOOGLE_SEARCH_ENGINE_ID=your-search-engine-id

1. Build the server:

bash npm run build

1. Start the server: bash npm start

🔧 Configuration

Environment Variables

Variable	Description	Required
GOOGLE_API_KEY	Your Google Custom Search API key	Yes
GOOGLE_SEARCH_ENGINE_ID	Your Custom Search Engine ID	Yes

Claude Desktop Integration

Add this configuration to your Claude Desktop config file (typically located at ~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "google-search": {
      "command": "node",
      "args": [
        "/absolute/path/to/mcp-google-custom-search-server/build/index.js"
      ],
      "env": {
        "GOOGLE_API_KEY": "your-api-key",
        "GOOGLE_SEARCH_ENGINE_ID": "your-search-engine-id"
      }
    }
  }
}

📖 API Reference

Available Tools

search

Performs a web search using Google Custom Search API.

Parameters:

• query (string, required): The search query to execute
• numResults (number, optional): Number of results to return
• Default: 5
• Maximum: 10

Example Response:

Result 1:
Title: Example Search Result
URL: https://example.com
Description: This is an example search result description
---

Result 2:
...

🛠️ Development

Project Structure

mcp-google-custom-search-server/
├── src/
│   └── index.ts          # Main server implementation
├── build/                # Compiled JavaScript output
├── .env                  # Environment variables
├── package.json          # Project dependencies and scripts
├── tsconfig.json         # TypeScript configuration
└── README.md            # Project documentation

Available Scripts

• npm run build: Compile TypeScript to JavaScript
• npm start: Start the MCP server
• npm run dev: Watch mode for development

Testing

1. Using MCP Inspector:

bash npx @modelcontextprotocol/inspector node build/index.js

1. Manual testing with example queries: bash # After starting the server {"jsonrpc":"2.0","id":1,"method":"callTool","params":{"name":"search","arguments":{"query":"example search"}}}

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Built with Model Context Protocol (MCP)
• Uses Google's Custom Search API
• Inspired by the need for better search capabilities in LLM applications