Core Web Vitals Optimizer
Fix LCP, INP, and CLS with field and lab evidence — per-metric diagnosis and fixes
- What
- Fix LCP, INP, and CLS with field and lab evidence — per-metric diagnosis and fixes
- Cost
- Free
- Needs
- none — guidance for any web project (works with Next.js, React, Vue/Nuxt, or plain sites)
- Install
- Copy the installer prompt below into your Muse — your agent does the rest.
Curated by Skill Harbor — a focused, evidence-led optimizer for the three Core Web Vitals: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift). Measure before optimizing: it pairs field data with lab evidence, then diagnoses per metric — LCP element identification and its optimization checklist, INP interaction breakdowns, CLS shift-source tracing — plus framework quick fixes for Next.js, React, and Vue/Nuxt. Distinct from its siblings in the same repo: `addyosmani-performance` (lot 30, the broad performance guide) and `addyosmani-web-quality-audit` (lot 31, the orchestrator that routes across checks) — this one is the deep dive on the three metrics themselves, with thresholds and fixes per metric. Pure guidance, no runtime dependencies, no accounts, no paid services. By @addyosmani, listed here with credit to its creator. Skill Harbor never reviews the code, review it yourself before use.
Version:
Install
Prerequisites: none — guidance for any web project (works with Next.js, React, Vue/Nuxt, or plain sites) Install "Core Web Vitals Optimizer" for me. Fix LCP, INP, and CLS with field and lab evidence — per-metric diagnosis and fixes Repository: https://github.com/addyosmani/web-quality-skills/blob/main/skills/core-web-vitals/SKILL.md 1. Fetch the SKILL.md file for the addyosmani-core-web-vitals skill from the repository into a temporary folder and summarize what it does in one or two sentences. 2. Safety check: review the SKILL.md and scripts for anything suspicious (unexpected network calls, shell commands, credential harvesting). This repo should contain zero secrets in code, credentials only via the secure vault, allowed hosts declared in the SKILL.md. Verify that holds here; STOP on any red flag and tell me. 3. Install it as a skill: copy SKILL.md and its helper files into the agent's skills directory, in a folder named "addyosmani-core-web-vitals". 4. Verify with no network calls: frontmatter valid, files in place. 5. Report what was installed, where, and what I still need to do myself (e.g. any accounts, API keys, or CLI tools mentioned in the prerequisites above). GitHub is optional: if I have a GitHub account or the gh CLI, you may use it; otherwise public access is fine. Never require it unless it's in the prerequisites above. Rules: don't touch anything outside the temp folder and the install target. Never ask me to paste secrets in chat — credentials go through the secure vault or environment variables. If anything looks off, stop and ask me.
Questions
How do I install a build?
Every product page includes a copy-paste install prompt. Paste it into your Muse and it sets the build up for you — no manual configuration.
Where does my money go?
Straight to the seller. Skill Harbor never processes payments: checkout happens on the seller’s own page, usually Stripe.
What does the ✓ next to a creator’s name mean?
It means we confirmed the identity of the person behind the listing. It says nothing about the code itself — always check a build before installing it.