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

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_histogramread-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_metricsread-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_optionsread-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. How we found it.

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