State of Web Vitals MCP MCP server

This MCP server provides access to real-user Core Web Vitals data from 200,000 websites, allowing agents to query metrics like LCP, INP, and CLS, filter by CMS or framework, and analyze performance distributions without authentication.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by CoreWebVitals

MCP endpoint (Streamable HTTP)

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

Vendor documentation

What you can do with it

Query Core Web Vitals pass rates and p75 metrics
Filter performance data by CMS, CDN, or framework
Retrieve distribution histograms for specific web vitals
Discover available metric keys and grouping options

Tools advertised by the last live check:

get_metrics
get_histogram
list_options

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add state-of-web-vitals-mcp --url https://www.corewebvitals.io/api/state-of-cwv/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable state-of-web-vitals-mcp in your MCP settings.

Cursor configuration

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

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "state-of-web-vitals-mcp": {
      "type": "streamableHttp",
      "url": "https://www.corewebvitals.io/api/state-of-cwv/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start state-of-web-vitals-mcp and inspect its tools.

VS Code configuration

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

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

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

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

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

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

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

See all 957

Do you run State of Web Vitals MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing