mcp-registry/io.github.corewebvitals/state-of-cwv · v1.0.0
Also listed as awesome/corewebvitals/state-of-cwv-mcp, glama/corewebvitals/state-of-web-vitals-mcp
As of 2026-10-17 06:22 UTC, the Corewebvitals State Of Cwv MCP server is up with a Glimind reliability score of 77/100 (grade B). Over the last 30 days it answered 99.6% of Glimind's liveness checks. It had 13 outages in 90 days, with a median recovery of 5 minutes.
Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth.
Claude Code
claude mcp add --transport http corewebvitals-state-of-cwv-mcp-server https://www.corewebvitals.io/api/state-of-cwv/mcp
Claude Desktop · Windsurf · Cline (mcpServers JSON)
{
"mcpServers": {
"corewebvitals-state-of-cwv-mcp-server": {
"type": "http",
"url": "https://www.corewebvitals.io/api/state-of-cwv/mcp"
}
}
}
Third-party server, listed as discovered. Review its source before installing.
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.
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.
Handshake + tools/list takes ~2,939 ms.
Serve tools/list from memory, keep the process warm, and host close to your users. Every new agent session pays this before its first call.
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.
Paste-ready definitions with the problems above fixed. Changes marked verify need a human look. All of them as JSON: /v1/readiness/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv/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":["mcp-registry/io.github.corewebvitals/state-of-cwv"],"email":"[email protected]"}'Agents: watch_tool({"toolId": "mcp-registry/io.github.corewebvitals/state-of-cwv"}) 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/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv?ref=badge)
<a href="https://glimind.com/server/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv?ref=badge"><img src="https://glimind.com/v1/readiness/badge/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv.svg" alt="MCP agent-readiness"></a>
.. image:: https://glimind.com/v1/readiness/badge/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv.svg :target: https://glimind.com/server/mcp-registry%2Fio.github.corewebvitals%2Fstate-of-cwv?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 3436 of 17,031. Version history · verify what your client received.
Compare: most reliable analytics servers
Glimind tells agents whether a server is up right now and how to call it, then fails over to a live alternative when it isn't.
Claude Code
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 2026-10-17 06:22 UTC, the Corewebvitals State Of Cwv MCP server is up with a Glimind reliability score of 77/100 (grade B). Over the last 30 days it answered 99.6% of Glimind's liveness checks. It had 13 outages in 90 days, with a median recovery of 5 minutes.
Corewebvitals State Of Cwv MCP server 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.