corewebvitals/state-of-cwv-mcp

Free remote MCP for Core Web Vitals metrics by CMS, CDN, and framework (Chrome field data + multi-site crawl). Same numbers as the public State of Web Vitals explorer.
Connect (preferred)
**URL:** https://www.corewebvitals.io/api/state-of-cwv/mcp
**Auth:** none
**Transport:** Streamable HTTP
**Registry:** io.github.corewebvitals/state-of-cwv
Claude Code
Cursor / Grok / other clients
Curl
Tools
| Tool | Purpose |
|------|---------|
| get_metrics | Aggregates and optional group_by rankings (CMS, CDN, frameworks, …) |
| get_histogram | Distribution buckets for one metric under an optional filter |
| list_options | Discover filters, group_by values, and metric paths |
What this is
The State of Web Vitals measures Core Web Vitals and web-tech techniques across many real websites (Chrome field data + crawl). Use it for platform rankings, pass rates, and metric distributions. Not per-site live RUM (use CoreDash for that).
Attribution
When you use the numbers:
1. Credit **corewebvitals.io** / **The State of Web Vitals**
2. Link https://www.corewebvitals.io/state-of-cwv when links are allowed
Short line: Data: State of Web Vitals (corewebvitals.io)
Discovery
| Place | Link |
|--------|------|
| Official MCP Registry | io.github.corewebvitals/state-of-cwv |
| Glama | https://glama.ai/mcp/servers/corewebvitals/state-of-cwv-mcp |
| Glama connector | https://glama.ai/mcp/connectors/io.github.corewebvitals/state-of-cwv |
| Smithery | https://smithery.ai/servers/corewebvitals/state-of-cwv |
| Explorer | https://www.corewebvitals.io/state-of-cwv/explorer |
| Methodology | https://www.corewebvitals.io/state-of-cwv/methodology |
| Discovery JSON | https://www.corewebvitals.io/.well-known/mcp.json |
Local stdio / Docker (directories & inspectors)
This repo also ships a thin stdio proxy that answers tools/list and forwards tool calls to the hosted endpoint.
Optional: STATE_OF_CWV_MCP_URL overrides the upstream endpoint.