Slash Command

/webvitals

Retrieves Core Web Vitals metrics (LCP, FID, CLS, TTFB, FCP) from the current page with good/needs-improvement/poor thresholds.

Html

Css

Javascript

frontend

performance

npx claudepluginhub serkan-ozal/browser-devtools-mcp

Prompt Preview

# /webvitals

Get Core Web Vitals metrics from the current page.

## Usage



## Description

Retrieves Core Web Vitals performance metrics from the current page including:
- **LCP** (Largest Contentful Paint) - Loading performance
- **FID** (First Input Delay) - Interactivity
- **CLS** (Cumulative Layout Shift) - Visual stability
- **TTFB** (Time to First Byte) - Server response time
- **FCP** (First Contentful Paint) - Initial render time

## Examples



## Interpreting Results

| Metric | Good | Needs Improvement | Poor |
|--------|------|-------------------|------|
| LCP | ≤2.5s | 2.5s-...

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Stats

Parent Repo Stars57

Parent Repo Forks29

Last CommitJan 18, 2026

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# /webvitals Get Core Web Vitals metrics from the current page. ## Usage ## Description Retrieves Core Web Vitals performance metrics from the current page including: - **LCP** (Largest Contentful Paint) - Loading performance - **FID** (First Input Delay) - Interactivity - **CLS** (Cumulative Layout Shift) - Visual stability - **TTFB** (Time to First Byte) - Server response time - **FCP** (First Contentful Paint) - Initial render time ## Examples ## Interpreting Results | Metric | Good | Needs Improvement | Poor | |--------|------|-------------------|------| | LCP | ≤2.5s | 2.5s-...

/webvitals

Get Core Web Vitals metrics from the current page.

Usage

/webvitals

Description

Retrieves Core Web Vitals performance metrics from the current page including:

LCP (Largest Contentful Paint) - Loading performance

FID (First Input Delay) - Interactivity

CLS (Cumulative Layout Shift) - Visual stability

TTFB (Time to First Byte) - Server response time

FCP (First Contentful Paint) - Initial render time

Examples

/webvitals

Interpreting Results

Metric	Good	Needs Improvement	Poor
LCP	≤2.5s	2.5s-4s	>4s
FID	≤100ms	100ms-300ms	>300ms
CLS	≤0.1	0.1-0.25	>0.25

Metric

Good

Needs Improvement

Poor

LCP

≤2.5s

2.5s-4s

>4s

FID

≤100ms

100ms-300ms

>300ms

CLS

≤0.1

0.1-0.25

>0.25

MCP Tools Used

o11y_get-web-vitals - Retrieve Web Vitals metrics