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WebPerf Snippets

io.github.nucliweb/webperf-snippets · v1.15.0

Measure Core Web Vitals and debug web performance with 56 snippets in a headless Chromium

Connect Runs on your machine

Terminal
claude mcp add webperf-snippets -e CRUX_API_KEY=<CRUX_API_KEY> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "webperf-snippets": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "CRUX_API_KEY": "<CRUX_API_KEY>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "webperf-snippets": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "CRUX_API_KEY": "<CRUX_API_KEY>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "webperf-snippets": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "CRUX_API_KEY": "<CRUX_API_KEY>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
CRUX_API_KEY
Optional, secret
Chrome UX Report API key for the field data of get_crux; the other tools work without it

Details

Package[email protected] (NPM, stdio)
First published10 Nov 2026
Last updated10 Nov 2026
Registry nameio.github.nucliweb/webperf-snippets

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