CoreDash. Real User Monitoring for Core Web Vitals

Created By

corewebvitalsa month ago

Query LCP, INP, and CLS field data from real visitors. Three tools: get_metrics, get_timeseries, get_histogram. Filter and group by device, country, page path, browser, OS, and 20+ dimensions. All data is real user monitoring (RUM) at the p75 percentile, the standard Google uses for Core Web Vitals ranking signals.

# rum

# core web vitals

Overview Content Tools Comments

Overview

CoreDash MCP Server

Real User Monitoring (RUM) for Core Web Vitals. Query LCP, INP, and CLS field data from real visitors, directly from your MCP compatible client.

Tools

get_metrics. Current performance scores. Filter by device, country, page path, URL, browser, OS, and 20+ dimensions. Group by any dimension to compare segments (for example, group by device to compare mobile vs desktop).
get_timeseries. Performance over time. Detect regressions and trends. The summary field tells you if metrics are improving, stable, or regressing.
get_histogram. Distribution shape of a single metric. Around 40 buckets with counts and good, improve, or poor ratings.

Setup

Generate an API key at https://coredash.app/settings/api
Add the server to your MCP client with header Authorization: Bearer cdk_YOUR_API_KEY

OAuth is also supported via WWW Authenticate discovery.

What it tracks

LCP (Largest Contentful Paint). Loading performance.
INP (Interaction to Next Paint). Interactivity.
CLS (Cumulative Layout Shift). Visual stability.
FCP, TTFB. Diagnostic metrics.

All data comes from real users in production at the p75 percentile, the standard Google uses for Core Web Vitals ranking signals.

Filterable and groupable dimensions

Device type, country, page path, URL, browser, OS, plus 20+ more including attribution elements (lcpel, inpel, clsel) so you can pinpoint which element on the page is causing slow LCP, slow INP, or layout shifts.

Server Config

{
  "mcpServers": {
    "coredash": {
      "url": "https://app.coredash.app/api/mcp",
      "headers": {
        "Authorization": "Bearer cdk_YOUR_API_KEY"
      }
    }
  }
}

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