PageSpeed Insights MCP wraps Google's PageSpeed Insights API. It runs Lighthouse on any public URL and pulls real-user Core Web Vitals from the Chrome UX Report. It is a community server by ruslanlap, not Google's, with an Apache-2.0 license. Version 2 has six tools.
Use it two ways. In Claude Code or claude.ai, check your pages after a deploy and compare them with competitors' in one prompt. In your own product, it can power an SEO or website audit feature. It runs only as a local process over stdio, with no hosted URL, so you host it yourself next to your backend.
Watch out
- The API is free, but Google's default quota is about 25,000 queries a day per Cloud project. In a product, cache results and limit audits per user.
- Each Lighthouse run takes several seconds and scores vary between runs. Compare several runs before you call a change a regression.
- It only tests public URLs. Field data shows up only for pages and origins with enough Chrome traffic, so small sites often get none.
Install
Create a Google API key in Google Cloud and enable the PageSpeed Insights API on it. Enable the Chrome UX Report API too if you want field data. Then in Claude Code:
Terminal
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claude mcp add pagespeed -e GOOGLE_API_KEY=your-key -- npx -y pagespeed-insights-mcp
It needs Node.js 20.19 or later. A Docker image builds from the repo.
In your product, there is no hosted URL to attach to the Claude API's
mcp_servers. Run it as a local process and connect with an MCP client over stdio, for example Experimental_StdioMCPTransport in the AI SDK, or wrap it in your own HTTP server. Keep the API key on the server.More in Top MCP servers for development.
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