State of Web Vitals MCP: Core Web Vitals by CMS, CDN and framework

How does LCP on one CMS compare with another, or INP by framework? The State of Web Vitals MCP server from corewebvitals.io answers with Core Web Vitals across 210,902 real sites, grouped by CMS, CDN and framework. ContextGate connects to it without a sign-in and lists its 3 tools, so Claude, ChatGPT or Cursor can query the data and every query is recorded.

  • Ready to connect
  • Free
  • 3 example tools

Query State of Web Vitals from Claude, ChatGPT or Cursor

  1. 1Click Connect State of Web Vitals free. There's no sign-in, so its tools are ready at once.
  2. 2All three tools read aggregate data, so keep them on: `list_options` tells your AI app which filters and groupings exist, and the other two return the numbers. Switch one off only if you want answers limited to headline figures or distributions.
  3. 3Add ContextGate to your AI app as a connector or MCP server. The steps for each app are on the Works with page.
  4. 4Ask your AI app how LCP compares across CDNs, then open Activity to see the `get_metrics` call.

Web performance questions it answers

  • Compare Core Web Vitals across CMSs, CDNs or frameworks with `get_metrics`, filtered and grouped the way you need.
  • See the shape of one metric, such as LCP, INP, CLS, FCP or TTFB, as histogram buckets with `get_histogram`.
  • Find the filter keys and group-by values you can use with `list_options`.
  • Back a performance argument in a tech review with numbers from real sites, attribution included.

The data covers 210,902 real sites, as of October 2026.

Queries on the record

  • Activity records every query, so the numbers quoted in a report can be traced to the call that produced them.
  • Switch off any of the three tools and your AI app won't see it.

What you get with State of Web Vitals and ContextGate

  • Your AI apps can use State of Web VitalsClaude, Cursor, ChatGPT and other AI apps reach State of Web Vitals through the one ContextGate connection you add to them.
  • You choose which tools they can useSwitch off any State of Web Vitals tool you don't want used. It's hidden from your AI apps and refused if called.
  • Every call is checked and recordedYour policies check each call (for example, personal data is hidden and secrets are blocked), and Activity keeps a record of it.

ContextGate sees only the tool calls that go through it, not your AI app's built-in tools or your chats.

State of Web Vitals tools

Examples of what your AI apps can do in State of Web Vitals. You'll see the exact list of tools after you connect it.