Claude Desktop

Step 1: Open the config file

Go to Settings → Developer → Edit Config, or open the file directly:

macOS

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

Windows

%APPDATA%\Claude\claude_desktop_config.json

Step 2: Add the MCP server

{
  "mcpServers": {
    "ab-test-library": {
      "url": "https://mcp-server-production-c654.up.railway.app/mcp",
      "headers": {
        "Authorization": "Bearer kstk_YOUR_KEY"
      }
    }
  }
}

Replace kstk_YOUR_KEY with your actual API key.

Already have other MCP servers?

Add ab-test-library inside your existing mcpServers object. Don't create a second mcpServers key.

Step 3: Restart Claude Desktop

Fully quit (Cmd+Q / Alt+F4) and reopen. You should see a hammer icon at the bottom of the chat input, indicating MCP tools are available.

Verify

Click the hammer icon. You should see 7 tools:

• search_ab_tests
• semantic_search_ab_tests
• get_section_insights
• get_patterns
• get_test_details
• find_tests_for_wireframe
• get_ab_test_statistics

Try asking: "Search for hero headline A/B tests"