MCP server

State of Web Vitals

io.github.corewebvitals/state-of-cwv

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkOfficial: corewebvitals.io's GitHub account (corewebvitals)About 1,247 tokens per request once connected3 tools

https://www.corewebvitals.io/api/state-of-cwv/mcp

At a glance

Type: MCP server
Publisher: corewebvitals.io (verified by the MCP Registry)
Status: Working at last check
Tools: 3
Token cost: About 1,247 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http state-of-cwv https://www.corewebvitals.io/api/state-of-cwv/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add state-of-cwv https://www.corewebvitals.io/api/state-of-cwv/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"state-of-cwv","server_url":"https://www.corewebvitals.io/api/state-of-cwv/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"state-of-cwv","server_url":"https://www.corewebvitals.io/api/state-of-cwv/mcp"}

get_histogram ~410 tokens
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 gr
get_metrics ~692 tokens
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/po
list_options ~145 tokens
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.

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