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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "state-of-cwv": {
      "type": "http",
      "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

[mcp_servers.state-of-cwv]
url = "https://www.corewebvitals.io/api/state-of-cwv/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "state-of-cwv": {
      "type": "remote",
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "state-of-cwv": {
      "type": "http",
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=state-of-cwv&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vd3d3LmNvcmV3ZWJ2aXRhbHMuaW8vYXBpL3N0YXRlLW9mLWN3di9tY3AifQ%3D%3D"
}

{
  "servers": {
    "state-of-cwv": {
      "type": "http",
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
    }
  }
}

{
  "mcpServers": {
    "state-of-cwv": {
      "httpUrl": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
    }
  }
}

extensions:
  "state-of-cwv":
    enabled: true
    name: "state-of-cwv"
    type: streamable_http
    uri: "https://www.corewebvitals.io/api/state-of-cwv/mcp"
    timeout: 300

Quality 85 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-03-26; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene86 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations3 of 3 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: get_metrics (idempotentHint, openWorldHint); get_histogram (idempotentHint, openWorldHint); list_options (idempotentHint, openWorldHint)
pass
tools.token_costabout 1,105 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

3 tools, about 1,105 tokens to load them all · tool set 4ea3eb1f6261 · checked 2026-10-20 18:06 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 90 / 100

provenance90

liveness100

freshness65

hygiene100

+repository +namespace-matches-repo +website +reachable +uptime-100% ~updated-96d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://www.corewebvitals.io/api/state-of-cwv/mcp` streamable-http	none	yes	100%	653 ms	2025-03-26	2026-10-20

Tools (3)

`get_histogram`read-only	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: 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.
`get_metrics`read-only	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 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_all3_plus_ttfb — pass all three plus TTFB - Contract paths: images.loading, stack.framework, scripts.origin, headers.has_etag, synthetic.tbt_ms, … Filter (optional AND): device, cms, framework, cdn, provider. Omit = all sites in the snapshot. Group_by (optional): cms \| frameworks \| cdn \| analytics \| tag_managers \| … → one row per entity. Without group_by: one aggregate; set metrics return top categories.
`list_options`read-only	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.

Schemas: list_tools.

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More from io.github.corewebvitals

Official server.json

{
  "name": "io.github.corewebvitals/state-of-cwv",
  "title": "State of Web Vitals",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "1.0.1",
  "repository": {
    "url": "https://github.com/corewebvitals/state-of-cwv-mcp",
    "source": "github"
  },
  "websiteUrl": "https://www.corewebvitals.io/state-of-cwv",
  "description": "Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth."
}