A Model Context Protocol (MCP) server lets AI assistants like Claude use the Exa AI Search API for web searches. This setup allows AI models to get real-time web information in a safe and controlled way.

Demo video https://www.loom.com/share/ac676f29664e4c6cb33a2f0a63772038?sid=0e72619f-5bfc-415d-a705-63d326373f60

The Model Context Protocol (MCP) is a system that lets AI apps, like Claude Desktop, connect to external tools and data sources. It gives a clear and safe way for AI assistants to work with local services and APIs while keeping the user in control.

The Exa MCP server:

• Enables AI assistants to perform web searches using Exa's powerful search API
• Provides structured search results including titles, URLs, and content snippets
• Caches recent searches as resources for reference
• Handles rate limiting and error cases gracefully
• Supports real-time web crawling for fresh content

Before you begin, ensure you have:

• Node.js (v18 or higher)
• Claude Desktop installed
• An Exa API key
• Git installed

You can verify your Node.js installation by running:

node --version  # Should show v18.0.0 or higher

npm install -g exa-mcp-server

To install the Exa MCP server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install exa --client claude

1. Clone the repository:

git clone https://github.com/exa-labs/exa-mcp-server.git
cd exa-mcp-server

1. Install dependencies:

npm install

1. Build the project:

npm run build

1. Create a global link (this makes the server executable from anywhere):

npm link

You can find claude_desktop_config.json inside the settings of Claude Desktop app:

Open the Claude Desktop app and enable Developer Mode from the top-left menu bar.

Once enabled, open Settings (also from the top-left menu bar) and navigate to the Developer Option, where you'll find the Edit Config button. Clicking it will open the claude_desktop_config.json file, allowing you to make the necessary edits.

OR (if you want to open claude_desktop_config.json from terminal)

1. Open your Claude Desktop configuration:

code ~/Library/Application\ Support/Claude/claude_desktop_config.json

1. Open your Claude Desktop configuration:

code %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "exa": {
      "command": "npx",
      "args": ["/path/to/exa-mcp-server/build/index.js"],
      "env": {
        "EXA_API_KEY": "your-api-key-here"
      }
    }
  }
}

Replace your-api-key-here with your actual Exa API key from dashboard.exa.ai/api-keys.

For the changes to take effect:

1. Completely quit Claude Desktop (not just close the window)
2. Start Claude Desktop again
3. Look for the 🔌 icon to verify the Exa server is connected

Once configured, you can ask Claude to perform web searches. Here are some example prompts:

Can you search for recent developments in quantum computing?

Search for and summarize the latest news about artificial intelligence startups in new york.

Find and analyze recent research papers about climate change solutions.

Search for today's breaking news about tech.

Search for the top 10 AI research papers from 2023, and only use live crawling as a fallback.

Search for electric vehicles and return 3 results, always using live crawling.

The server will:

1. Process the search request
2. Query the Exa API with optimal settings (including live crawling)
3. Return formatted results to Claude
4. Cache the search for future reference

• Simplified Web Search Tool: Enables Claude to search the web with just a query parameter
• Customizable Search Parameters: Control the number of results and live crawling strategy
• Automatic Live Crawling: Uses real-time crawling based on specified strategy
• Preset Optimal Parameters: Uses best defaults for result count and character limits
• Search Caching: Saves recent searches as resources for reference
• Error Handling: Gracefully handles API errors and rate limits
• Type Safety: Full TypeScript implementation with Zod validation
• MCP Compliance: Fully implements the latest MCP protocol specification

You can test the server directly using the MCP Inspector:

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

This opens an interactive interface where you can explore the server's capabilities, execute search queries, and view cached search results.

1. Server Not Found

   • Verify the npm link is correctly set up
   • Check Claude Desktop configuration syntax
   • Ensure Node.js is properly installed

2. API Key Issues

   • Confirm your EXA_API_KEY is valid
   • Check the EXA_API_KEY is correctly set in the Claude Desktop config
   • Verify no spaces or quotes around the API key

3. Connection Issues

   • Restart Claude Desktop completely
   • Check Claude Desktop logs:

   # macOS
   tail -n 20 -f ~/Library/Logs/Claude/mcp*.log
   
   # Windows
   type "%APPDATA%\Claude\logs\mcp*.log"

If you encounter issues, review the MCP Documentation or visit the GitHub discussions for community support.

• Exa AI for their powerful search API
• Model Context Protocol for the MCP specification
• Anthropic for Claude Desktop