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100
MCP live MCP 2025-03-26 streamable-http

State of Web Vitals

io.github.corewebvitals/state-of-cwv

Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth.

Watch this dependency

Get before/after evidence when observed tools, schemas, authentication access, availability or the endpoint changes.

Inspect evidence and set up a watch Share public evidence report
Uptime
100.0%
5 direct probes · 30d
Response
261ms
last probe
Tools
3
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://www.corewebvitals.io/api/state-of-cwv/mcp
Score: 100/100
Handshake verified by our own probe.
why this score
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
3 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
3 items in total; 3 or more earns these points.
pass Describes itself 10/10
78 characters; more than 30 earns these points.

Tools · 3

get_metrics

What 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 numbe…

get_histogram

What 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:…

list_options

Discover 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.

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "state_of_web_vitals": {
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp",
      "transport": "streamable-http"
    }
  }
}