Lighthouse MCP

MIT License

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get_core_web_vitals

Measure Core Web Vitals metrics (LCP, FID, CLS) for any website to assess user experience. Specify URL, device, and thresholds to evaluate performance and optimize page speed.

Instructions

Get Core Web Vitals metrics for a website

Input Schema

Name	Required	Description	Default
`device`	No	Device to emulate (default: desktop)	desktop
`includeDetails`	No	Include detailed metrics and recommendations
`threshold`	No
`url`	Yes	URL to audit

Input Schema (JSON Schema)

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "device": {
      "default": "desktop",
      "description": "Device to emulate (default: desktop)",
      "enum": [
        "desktop",
        "mobile"
      ],
      "type": "string"
    },
    "includeDetails": {
      "default": false,
      "description": "Include detailed metrics and recommendations",
      "type": "boolean"
    },
    "threshold": {
      "additionalProperties": false,
      "properties": {
        "cls": {
          "description": "Cumulative Layout Shift threshold",
          "minimum": 0,
          "type": "number"
        },
        "fid": {
          "description": "First Input Delay threshold in milliseconds",
          "minimum": 0,
          "type": "number"
        },
        "lcp": {
          "description": "Largest Contentful Paint threshold in seconds",
          "minimum": 0,
          "type": "number"
        }
      },
      "type": "object"
    },
    "url": {
      "description": "URL to audit",
      "type": "string"
    }
  },
  "required": [
    "url"
  ],
  "type": "object"
}

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