Google CrUX MCP

An MCP server that provides read-only access to the Chrome UX Report (CrUX) API, allowing AI agents to retrieve real-user Core Web Vitals metrics such as LCP, INP, and CLS for any public origin or URL. It supports device comparisons (mobile vs desktop), origin-versus-page comparisons, and 40-week trend analysis using field data collected from Chrome users.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by A1-x-Tech

You need:You need Node.js 20+ and a Google Cloud API key with Chrome UX Report API enabled.Create a restricted API key

Vendor documentation

What you can do with it

Check if a public site passes Core Web Vitals on mobile
Compare mobile vs desktop performance metrics
Analyze 40-week trends for specific URLs
Compare origin average vs specific page performance

Source and maintenance

Community listingRegistry 1.2.1

mcp-registry: io.github.A1-x-Tech/mcp-google-crux@1.2.1 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

mcp-google-crux 1.2.1

npm

mcp-google-crux package definition

{
  "version": "1.2.1",
  "transport": "stdio",
  "identifier": "mcp-google-crux",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "CRUX_API_KEY",
      "isRequired": true,
      "description": "Google Cloud API key with the Chrome UX Report API enabled (sent as the key= query parameter). Treat it as a secret."
    },
    {
      "name": "CRUX_API_BASE",
      "default": "https://chromeuxreport.googleapis.com",
      "description": "API root host override."
    },
    {
      "name": "CRUX_TIMEOUT_MS",
      "default": "30000",
      "description": "Per-request timeout in milliseconds."
    },
    {
      "name": "CRUX_MAX_RETRIES",
      "default": "3",
      "description": "Retries on transient errors (429, 5xx, network)."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "google-crux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux@1.2.1"
      ],
      "env": {
        "CRUX_API_KEY": "<YOUR_CRUX_API_KEY>",
        "CRUX_API_BASE": "<YOUR_CRUX_API_BASE>",
        "CRUX_TIMEOUT_MS": "<YOUR_CRUX_TIMEOUT_MS>",
        "CRUX_MAX_RETRIES": "<YOUR_CRUX_MAX_RETRIES>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "google-crux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux@1.2.1"
      ],
      "env": {
        "CRUX_API_KEY": "<YOUR_CRUX_API_KEY>",
        "CRUX_API_BASE": "<YOUR_CRUX_API_BASE>",
        "CRUX_TIMEOUT_MS": "<YOUR_CRUX_TIMEOUT_MS>",
        "CRUX_MAX_RETRIES": "<YOUR_CRUX_MAX_RETRIES>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "google-crux-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux@1.2.1"
      ],
      "env": {
        "CRUX_API_KEY": "<YOUR_CRUX_API_KEY>",
        "CRUX_API_BASE": "<YOUR_CRUX_API_BASE>",
        "CRUX_TIMEOUT_MS": "<YOUR_CRUX_TIMEOUT_MS>",
        "CRUX_MAX_RETRIES": "<YOUR_CRUX_MAX_RETRIES>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "google-crux-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux@1.2.1"
      ],
      "env": {
        "CRUX_API_KEY": "<YOUR_CRUX_API_KEY>",
        "CRUX_API_BASE": "<YOUR_CRUX_API_BASE>",
        "CRUX_TIMEOUT_MS": "<YOUR_CRUX_TIMEOUT_MS>",
        "CRUX_MAX_RETRIES": "<YOUR_CRUX_MAX_RETRIES>"
      }
    }
  }
}

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