Google CrUX MCP

Name: Google CrUX MCP
Author: A1-x-Tech

by A1-x-Techversion 1.2.1i★ –iRuns on your computer

Registry nameio.github.A1-x-Tech/mcp-google-crux

Install

Overview

Description from the maker (original English)

Real-user Core Web Vitals from the Chrome UX Report (CrUX) API for any origin or URL.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiEarly↓ 527/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Web & browsers
You need to fill in: CRUX_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: CRUX_API_KEY, CRUX_API_BASE, CRUX_TIMEOUT_MS, CRUX_MAX_RETRIES

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "google-crux": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux"
      ],
      "env": {
        "CRUX_API_KEY": "your-value",
        "CRUX_API_BASE": "your-value",
        "CRUX_TIMEOUT_MS": "your-value",
        "CRUX_MAX_RETRIES": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add google-crux --env CRUX_API_KEY=your-value --env CRUX_API_BASE=your-value --env CRUX_TIMEOUT_MS=your-value --env CRUX_MAX_RETRIES=your-value -- npx -y mcp-google-crux

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "google-crux": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux"
      ],
      "env": {
        "CRUX_API_KEY": "your-value",
        "CRUX_API_BASE": "your-value",
        "CRUX_TIMEOUT_MS": "your-value",
        "CRUX_MAX_RETRIES": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "google-crux": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-google-crux"
      ],
      "env": {
        "CRUX_API_KEY": "your-value",
        "CRUX_API_BASE": "your-value",
        "CRUX_TIMEOUT_MS": "your-value",
        "CRUX_MAX_RETRIES": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

CRUX_API_KEY secret required env
Google Cloud API key with the Chrome UX Report API enabled (sent as the key= query parameter). Treat it as a secret.
CRUX_API_BASE env
API root host override.
CRUX_TIMEOUT_MS env
Per-request timeout in milliseconds.
CRUX_MAX_RETRIES env
Retries on transient errors (429, 5xx, network).

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account A1-x-Tech, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Web & browsersi

More stars than 0% of the other 1399 servers in this category
Published to the registry more recently than 80% of the other 1399 servers in this category
Basic checks equal to or better than 100% of the other 1399 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Google CrUX MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: CRUX_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.2.1) reached the registry 9 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Browser Use, Chrome DevTools MCP, MCP Server Browser

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Browser Use

Lets AI do web tasks for you, such as filling forms, searching and extracting data, in the maker’s cloud browsers or on your computer.

by browser-useWidely used↓ 1.6M/wk★ 120.1KUpdated 19 days ago

Computer or cloud✓ browser-use.com

Install

Chrome DevTools MCP

Lets AI use Chrome’s developer tools to inspect pages, find what makes them slow and spot errors. Made by the Chrome DevTools team.

by ChromeDevToolsWidely used↓ 1.9M/wk★ 54.8KUpdated 18 days ago

Runs on your computer

Install

MCP Server Browser

MCP server for browser use access

by bytedanceWidely used↓ 792/wk★ 39.6KUpdated 14 months ago

Runs on your computer

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Google CrUX MCP

English | Русский

A1 Google CrUX MCP brings real-user Core Web Vitals data into an AI app. Check whether a public site or page passes LCP, INP and CLS, compare mobile with desktop, and see how the metrics changed over time.

It reads Google’s Chrome UX Report dataset — field data collected from Chrome users, not a synthetic speed test or a way to change your site.

6 read-only tools. Core Web Vitals assessment, device comparison, origin-versus-page comparison, 40-week trend and raw latest or historical records.
Real-user data. It is the same CrUX field data used by PageSpeed Insights and Google’s Core Web Vitals signals.
Clear availability boundary. Only public origins and URLs with enough real-user traffic have data; no_data is a valid result.
Known quota cost. CrUX allows 150 queries per minute per project. Device comparison makes four API calls; origin-versus-page makes two.

Start with a read-only question:

Does https://example.com pass Core Web Vitals on mobile?

Connect the server · Explore use cases · Open technical documentation

See it work in a minute

You: Does https://example.com/pricing pass Core Web Vitals on mobile?

Assistant: Shows p75 LCP, INP and CLS, their good/needs-improvement/poor ratings and the overall result. Nothing changes.

You: Compare this page with the site average and show how mobile differs from desktop.

Assistant: Compares the origin and URL, then device groups and their traffic shares. All six tools read the public CrUX dataset only.

Quick start
What you can ask it to do
How to read CrUX data
Getting access
Configuration
Data, limits and background work
Technical documentation
Support

Quick start

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

Create a restricted API key.
Add the server to your AI app.
Ask the read-only question above.

Codex

In Settings → MCP servers, select Add server, choose STDIO, enter the command npx -y mcp-google-crux@latest and environment variables CRUX_API_KEY, then select Save and Restart.

codex mcp add google-crux --env CRUX_API_KEY=your_key -- npx -y mcp-google-crux@latest

codex mcp list

Codex MCP documentation

Claude Code

claude mcp add --env CRUX_API_KEY=your_key --transport stdio --scope user google-crux -- npx -y mcp-google-crux@latest

claude mcp list

Claude Code MCP documentation

Claude Desktop

The current official path is Settings → Extensions. For a custom desktop extension, open Advanced settings → Extension Developer → Install Extension…, select a .mcpb file and follow the prompts.

This repository currently publishes an npm stdio package and does not contain a .mcpb bundle. For Claude Desktop builds that still support local configuration, use the following JSON stdio configuration as a fallback:

{"mcpServers":{"google-crux":{"command":"npx","args":["-y","mcp-google-crux@latest"],"env":{"CRUX_API_KEY":"your_key"}}}}

In those builds, save it to ~/Library/Application Support/Claude/claude_desktop_config.json on macOS or %APPDATA%\Claude\claude_desktop_config.json on Windows.

Claude Desktop MCP documentation

Cursor

Add {"mcpServers":{"google-crux":{"type":"stdio","command":"npx","args":["-y","mcp-google-crux@latest"],"env":{"CRUX_API_KEY":"your_key"}}}} to ~/.cursor/mcp.json on macOS/Linux or %USERPROFILE%\.cursor\mcp.json on Windows. Cursor MCP documentation

VS Code

Run MCP: Open User Configuration and add:

{"servers":{"google-crux":{"type":"stdio","command":"npx","args":["-y","mcp-google-crux@latest"],"env":{"CRUX_API_KEY":"${input:crux_api_key}"}}},"inputs":[{"type":"promptString","id":"crux_api_key","description":"Google Cloud API key","password":true}]}

Check it with MCP: List Servers. VS Code MCP documentation

What you can ask it to do

Does this public origin or URL pass Core Web Vitals?
Compare phone, desktop, tablet and all-device results.
Is this page faster or slower than the site average?
How did LCP, INP and CLS change during the last 25 weeks?
Show the raw CrUX histograms and percentiles for a technical review.

How to read CrUX data

CrUX reports a rolling 28-day window, updated daily. Historical data is weekly and updates on Mondays. The key value is p75: 75% of observed visits are at or below it. get_core_web_vitals interprets metric thresholds for you; raw record tools expose full histograms and density fractions.

No data does not mean the site is broken. It means Google has no sufficiently large public Chrome-user sample for that origin, URL or device group. Tablets and individual URLs often have no data.

Getting access

In Google Cloud Console, create or select a project; no billing account is needed for CrUX.
Enable the Chrome UX Report API.
Create an API key in APIs & Services → Credentials.
Restrict the key to Chrome UX Report API and pass it as CRUX_API_KEY.

The key is stored in the MCP client configuration and is sent in the API request URL, so treat it as a password.

Configuration

Variable	Required	Description
`CRUX_API_KEY`	Yes	Google Cloud key with Chrome UX Report API enabled.
`CRUX_API_BASE`	No	API base URL override.
`CRUX_TIMEOUT_MS`	No	Per-request timeout; default `30000` ms.
`CRUX_MAX_RETRIES`	No	Retries for 429, 5xx and network failures; default `3`.

Data, limits and background work

Read-only public dataset. The server cannot alter sites, Search Console, CrUX records or Google rankings.
Quota-aware retries. It retries 429, 5xx and network errors with backoff. Keep compound comparisons in mind when budgeting the 150 queries per minute project quota.
No background monitoring. The server works only while called. If your AI app supports scheduled tasks, it can create a recurring performance report.
Anonymous telemetry. It sends installation and version data plus tool names, never API keys, queried URLs, results, arguments or prompts. For each tool call it also sends the outcome and, on failure, an excerpt of the error text with e-mails, addresses, tokens, numbers of 4+ digits and quoted text replaced by #; a value from your request can appear in it if the error text contains it. Set ASKADS_TELEMETRY=0 to opt out.

Technical documentation

MCP capability catalog — task-oriented pages for every tool.
All tools and inputs
Development documentation
Publishing documentation
CrUX API documentation

Support

Found a bug or need a scenario? Create an issue or write in Telegram.

You made it to the end!

Google CrUX MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Web & browsersi

Common questions

Alternatives

Browser Use

Chrome DevTools MCP

MCP Server Browser

README from the maker

Google CrUX MCP

See it work in a minute

Contents

Quick start

What you can ask it to do

How to read CrUX data

Getting access

Configuration

Data, limits and background work

Technical documentation

Support