glama/corewebvitals/state-of-web-vitals-mcp · v1.0.0
Also listed as awesome/corewebvitals/state-of-cwv-mcp, mcp-registry/io.github.corewebvitals/state-of-cwv · primary listing: mcp-registry/io.github.corewebvitals/state-of-cwv
As of 2026-10-26 16:58 UTC, corewebvitals/State of Web Vitals MCP is up with a Glimind reliability score of 78/100 (grade B). Over the last 30 days it answered 99.2% of Glimind's liveness checks. It had 19 outages in 90 days, with a median recovery of 11 minutes.
Free remote MCP for Core Web Vitals metrics by CMS, CDN, and framework (Chrome field data + multi-site crawl). No auth. Endpoint: https://www.corewebvitals.io/api/state-of-cwv/mcp
Point your MCP client at this streamable-http endpoint: https://www.corewebvitals.io/api/state-of-cwv/mcp
1 tool(s) have parameters with no type (no type/enum/anyOf/$ref).
Give every parameter a "type" (or "enum"/"anyOf"). Untyped parameters make models guess — strings for numbers, objects for arrays. How to fix →
Negotiates MCP 2025-03-26. Structured output, tool output schemas and elicitation arrived in 2025-06-18.
Upgrade the MCP SDK and negotiate 2025-06-18 or newer. How to fix →
No tool declares an outputSchema.
Declare outputSchema and return structuredContent (MCP 2025-06-18+). Agents can then parse results without guessing, and chain tools reliably. How to fix →
Paste-ready definitions with the problems above fixed. Changes marked verify need a human look. All of them as JSON: /v1/readiness/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp/fixes
{
"name": "get_metrics",
"description": "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.\n\nMetrics (comma-separated or array):\n- CWV: lcp, inp, cls, fcp, ttfb — good/needs_improvement/poor share + p50/p75 + sample n\n- good_all3 — share of sites that pass LCP+INP+CLS together\n- good_all3_plus_ttfb — pass all three plus TTFB\n- Contract paths: images.loading, stack.framework, scripts.or",
"inputSchema": {
"type": "object",
"properties": {
"focus": {
"enum": [
"lcp",
"inp",
"cls",
"fcp",
"ttfb"
],
"type": "string",
"description": "CWV used when correlating technique metrics. Default: lcp."
},
"limit": {
"type": "integer",
"description": "Max groups or top categories. Default: 25, max: 100."
},
"filter": {
"type": "object",
"properties": {
"cdn": {
"type": "string",
"description": "Only sites on this CDN key (cloudflare, origin, …)."
},
"cms": {
"type": "string",
"description": "Only sites on this CMS key (wordpress, shopify, wix, …)."
},
"device": {
"enum": [
"all",
"phone",
"desktop"
],
"type": "string",
"description": "CrUX device slice. Default: all."
},
"provider": {
"type": "string",
"description": "Only sites that load this third-party provider key (google_analytics_4, …)."
},
"framework": {
"type": "string",
"description": "Only sites that include this JS framework key (react, vue, jquery, …)."
}
},
"description": "AND filters. Omit for all sites in the dataset. Keys: device (all|phone|desktop), cms, framework, cdn, provider (key), provider_category (e.g. analytics — use with provider or alone is not enough; prefer group_by for rankings).",
"additionalProperties": false
},
"metrics": {
"description": "Metrics to return. Default: lcp,inp,cls,ttfb,good_all3. String (comma-separated) or array of strings.",
"type": "string"
},
"group_by": {
"type": "string",
"description": "Break results down by this dimension: cms, frameworks, cdn, or a provider category (analytics, tag_managers, …). Omit for a single aggregate."
},
"min_sites": {
"type": "integer",
"description": "When group_by is set, drop groups with fewer sites. Default: 50."
}
}
},
"annotations": {
"title": "Get metrics",
"readOnlyHint": true,
"destructiveHint": false
}
}Get an email or webhook when this server's readiness drops by 10+ points, tool-poisoning text appears, or a tool breaks:
curl -X POST https://glimind.com/v1/subscriptions -H 'content-type: application/json' -d '{"tools":["glama/corewebvitals/state-of-web-vitals-mcp"],"email":"[email protected]"}'Agents: watch_tool({"toolId": "glama/corewebvitals/state-of-web-vitals-mcp"}) over MCP.
get_metrics ~586 tokensget_histogram ~399 tokenslist_options ~141 tokensStatic checks of the advertised tools/list (schema, descriptions, annotations, tool-poisoning patterns, names, size) plus observed protocol, uptime, latency and contract changes. Read-only: no tool is ever called. Weights: schema 15, docs 20, safety 15, efficiency 15, compatibility 15, protocol 5, reliability 10, stability 5. Token counts are estimates (~3.6 characters per token).
Operator? Fix these, then re-check live. Embed the readiness badge:
[](https://glimind.com/server/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp?ref=badge)
<a href="https://glimind.com/server/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp?ref=badge"><img src="https://glimind.com/v1/readiness/badge/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp.svg" alt="MCP agent-readiness"></a>
.. image:: https://glimind.com/v1/readiness/badge/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp.svg :target: https://glimind.com/server/glama%2Fcorewebvitals%2Fstate-of-web-vitals-mcp?ref=badge :alt: MCP agent-readiness
Glimind records every version of this server's tool definitions in a signed, append-only transparency log. Current manifest sha256:b2e2ed4d39f2daac…, first seen 2026-10-17, included at leaf 4335 of 74,268. Version history · verify what your client received.
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claude mcp add --transport http glimind https://glimind.com/mcp
Claude Desktop · Windsurf · Cline (mcpServers JSON)
{
"mcpServers": {
"glimind": {
"type": "http",
"url": "https://glimind.com/mcp"
}
}
}
As of 2026-10-26 16:58 UTC, corewebvitals/State of Web Vitals MCP is up with a Glimind reliability score of 78/100 (grade B). Over the last 30 days it answered 99.2% of Glimind's liveness checks. It had 19 outages in 90 days, with a median recovery of 11 minutes.
corewebvitals/State of Web Vitals MCP advertises 3 tools, including get_histogram, get_metrics, list_options.
Point your MCP client at this streamable-http endpoint: https://www.corewebvitals.io/api/state-of-cwv/mcp
Glimind scanned all 3 tool definitions for tool-poisoning patterns — hidden or invisible characters, instructions that override the model, concealment from the user, requests to read credential or MCP config files, conversation exfiltration and cross-tool shadowing — and found none. This checks what the server tells the model, not what its code does; review the source before granting access to sensitive data.
Status page: 90-day uptime, every outage and how long it lasted.
Claim this listing to get the Verified operator marker, a remediation checklist and owner analytics, or embed the live badge from any of the tool pages above. Maintainers: alerts, deploy attestation and monthly reports.
Status is an automated estimate from Glimind's liveness checks (handshake and tool listing only; no tool is ever called) and may lag or differ from your network. Glimind is not affiliated with this server or its operator. Operator? Request a correction or opt out at https://glimind.com/opt-out.