State of Web Vitals
Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth.
Connect it
Settings → Connectors → Add custom connector
URL: https://www.corewebvitals.io/api/state-of-cwv/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://www.corewebvitals.io/api/state-of-cwv/mcp{
"mcpServers": {
"state-of-cwv": {
"url": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
}
}
}claude mcp add --transport http state-of-cwv https://www.corewebvitals.io/api/state-of-cwv/mcp{
"servers": {
"state-of-cwv": {
"type": "http",
"url": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
}
}
}3 tools, verified live
get_metricsread-onlyWhat are the numbers? Aggregate Core Web Vitals and/or technique metrics across sites, with optional filter and group_by. Responses include attribution — credit corewebvitals.io when you use the numbers. Metrics (comma-separated or array): - CWV: lcp, inp, cls, fcp, ttfb — good/needs_improvement/poor share + p50/p75 + sample n - good_all3 — share of sites that pass LCP+INP+CLS together - good_all
get_histogramread-onlyWhat is the shape of one metric? Returns histogram buckets (count + share) plus summary stats. Metric: one of lcp, inp, cls, fcp, ttfb (field CWV), or a scalar technique path when available. Filter: same as get_metrics (device, cms, framework, cdn, provider). No group_by — call get_metrics with group_by to compare segments, then get_histogram per segment if needed.
list_optionsread-onlyDiscover what you can pass to get_metrics / get_histogram: filter keys, group_by values, built-in metrics, and contract metric paths (optional kind filter). Call this when unsure of a key or path.
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