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# Core Web Vitals Data Explorer: 3 WebMCP tools for AI agents

![](https://www.google.com/s2/favicons?domain=corewebvitals.io&sz=96)

Developer tools · corewebvitals.io

## Core Web Vitals Data Explorer

State of Web Vitals dataset from real-user data. Agents can query cross-site metrics, distributions and filter options.

[Open corewebvitals.io](https://www.corewebvitals.io/state-of-cwv/explorer)

## Ask an agent to

-   Compare median LCP for WordPress vs Shopify sites
-   Show the INP distribution for mobile sites
-   List the filters and metrics I can query

## 3 tools

-   `get_histogram`read-only
    
    Distribution shape for one Core Web Vital (or scalar technique path) under optional filter. Returns ~bucket counts with good/improve/poor bands. No group\_by — filter to one segment, or use get\_metrics for comparisons.…
    
    metric: string, filter: object?
    
-   `get_metrics`read-only
    
    Cross-site Core Web Vitals and technique metrics from the State of Web Vitals explorer (Chrome field data + multi-site crawl). Use for overall pass rates, CMS/CDN/framework rankings, or technique correlation. Not…
    
    metrics?, filter: object?, group\_by: string?, limit: number?, min\_sites: number?, focus: string?
    
-   `list_options`read-only
    
    Discovery helper: valid filter keys, group\_by values, built-in metric names, sample entity keys, and optional contract paths. Call this before get\_metrics when unsure of allowed values.
    
    kind: string?, include\_paths: boolean?
    

Tools

3

Registered with

JavaScript

Tranco rank

#124,880

Re-checked

Oct 24, 2026

Tool names and descriptions are what www.corewebvitals.io/state-of-cwv/explorer registered when we loaded it in Chrome 154 on Browser Use Cloud. The summary and the “ask an agent” lines are AI-written from them. To call the tools yourself, see [Chrome’s WebMCP docs](https://developer.chrome.com/docs/ai/webmcp). [How we found it](https://browser-use.com/webmcp#method).

## More developer tools sites

-   [![](https://www.google.com/s2/favicons?domain=zoomeye.ai&sz=64)ZoomEye2 tools · zoomeye.ai](https://browser-use.com/webmcp/zoomeye.ai)
-   [![](https://www.google.com/s2/favicons?domain=azion.com&sz=64)Azion3 tools · azion.com](https://browser-use.com/webmcp/azion.com)
-   [![](https://www.google.com/s2/favicons?domain=host-tracker.com&sz=64)HostTracker2 tools · host-tracker.com](https://browser-use.com/webmcp/host-tracker.com)
-   [![](https://www.google.com/s2/favicons?domain=nodecraft.com&sz=64)Nodecraft3 tools · nodecraft.com](https://browser-use.com/webmcp/nodecraft.com)
-   [![](https://www.google.com/s2/favicons?domain=proxidize.com&sz=64)Proxidize3 tools · proxidize.com](https://browser-use.com/webmcp/proxidize.com)
-   [![](https://www.google.com/s2/favicons?domain=developers.openai.com&sz=64)OpenAI Developers5 tools · developers.openai.com](https://browser-use.com/webmcp/developers.openai.com)

[All 1,393 developer tools sites →](https://browser-use.com/webmcp/developer-tools)