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WebPerf Snippets MCP Server

local only

WebPerf Snippets runs on your own machine — the client starts it, so there is no endpoint to ping. 630 installs a week from npm. Last commit 24 Oct 2026.

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

Installs per day peak 212 · avg 53 · -31% w/w
a month agotoday
630
Installs / week
npm · webperf-snippets
1 454
Stars
2 open issues
24 Oct 2026
Last commit
from GitHub
MIT
License
JavaScript

What the code does

We read the source, 37 min ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

File ships in the package but is absent from the source [пакет] src/workflows/audit.js:1, [пакет] src/bin.js:1, [пакет] src/browser.js:1 и ещё 31
этот файл ставится пользователю, но в репозитории его нет
Executes code built at runtime extension/panel.js:14
    chrome.devtools.inspectedWindow.eval(expression, (result, exception) => {
| **⚫ Unknown**     | Inline scripts, eval(), no source attribution | **Need investigation** - Likely your code                      |

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add webperf-snippets -- npx -y webperf-snippets
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "webperf-snippets": {
      "command": "npx",
      "args": [
        "-y",
        "webperf-snippets"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.webperf-snippets]
command = "npx"
args = ["-y", "webperf-snippets"]
.cursor/mcp.json
{
  "mcpServers": {
    "webperf-snippets": {
      "command": "npx",
      "args": [
        "-y",
        "webperf-snippets"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "webperf-snippets": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "webperf-snippets"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: CRUX_API_KEY (Chrome UX Report API key for the field data of get_crux; the other tools work without it).

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WebPerf Snippets — questions

Answers built from our own checks of this server.

Why is there no uptime for WebPerf Snippets?
WebPerf Snippets runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package webperf-snippets was installed 630 times last week.
How do I connect WebPerf Snippets?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls webperf-snippets straight from npm; nothing to host, nothing to sign up for.
How many people use WebPerf Snippets?
The npm package webperf-snippets was installed 630 times in the last week. Week over week that is -31%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is WebPerf Snippets open source?
Yes — it is published under the MIT licence, written in JavaScript, 1 454 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.