web-vitals-monitor

Web Vitals Monitor - Auto-activating skill for Frontend Development. Triggers on: web vitals monitor, web vitals monitor Part of the Frontend Development skill category.

1.00x

Quality

Does it follow best practices?

Impact

100%

1.00x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./planned-skills/generated/05-frontend-dev/web-vitals-monitor/SKILL.md

Evaluation results

100%

Add Performance Monitoring to React E-Commerce App

React web vitals integration

Criteria

Without context

With context

Uses web-vitals package

100%

Imports from web-vitals

100%

Captures LCP

100%

Captures CLS

100%

Captures FID or INP

100%

Captures FCP

100%

Captures TTFB

100%

Sends to analytics endpoint

100%

Production-ready reporter

100%

Wired into React entry point

100%

JSON payload format

100%

Metric name included in payload

100%

Without context: $0.3761 · 1m 52s · 20 turns · 21 in / 6,172 out tokens

With context: $0.4955 · 1m 49s · 27 turns · 443 in / 6,690 out tokens

100%

Build a Web Vitals Scoring and Alerting Utility

Core Web Vitals threshold validation

Criteria

Without context

With context

LCP thresholds correct

100%

CLS thresholds correct

100%

FID thresholds correct

100%

FCP thresholds correct

100%

TTFB thresholds correct

100%

Three-tier rating output

100%

All Core Web Vitals covered

100%

Unit tests with boundary values

100%

Production-ready module

100%

Thresholds documented

100%

Demo script runnable

100%

Without context: $0.4002 · 1m 40s · 16 turns · 17 in / 7,674 out tokens

With context: $0.6350 · 2m 18s · 29 turns · 28 in / 9,739 out tokens

100%

Instrument a Vue.js Marketing Site with Real-User Performance Monitoring

Vue.js web vitals monitoring

Criteria

Without context

With context

Uses web-vitals package

100%

Imports web-vitals functions

100%

Captures LCP

100%

Captures CLS

100%

Captures FID or INP

100%

Captures FCP

100%

Captures TTFB

100%

Vue 3 plugin pattern

100%

Configurable endpoint URL

100%

Sends via HTTP POST

100%

Production-ready plugin

100%

Plugin installed in main

100%

Without context: $0.4123 · 1m 32s · 23 turns · 23 in / 5,961 out tokens

With context: $0.4570 · 1m 43s · 29 turns · 28 in / 5,592 out tokens

Repository: jeremylongshore/claude-code-plugins-plus-skills
Commit: 994edc4

Evaluated: 18 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Add Performance Monitoring to React E-Commerce App Build a Web Vitals Scoring and Alerting Utility Instrument a Vue.js Marketing Site with Real-User Performance Monitoring

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