What is seo-lighthouse-audit?

A tool that checks a website URL using Lighthouse, Google's automated website-quality checker, and reports scores and failed checks.

Use it to review performance, accessibility, SEO, and general web-development practices on mobile or desktop versions of a site.

It turns a long technical audit into a list of detected problems, links to the relevant Chrome documentation, and gives a short fix for each problem.

seo-lighthouse-audit — Skill for Claude Code by lionkiii

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add lionkiii/claude-seo-skills --skill seo-lighthouse-audit

Clone the repo

git clone --depth 1 https://github.com/lionkiii/claude-seo-skills

Made for: Claude Code.

Or install claude-seo-skills, the plugin that ships this one along with the rest of its 51 skills, 6 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit/github.svg)](https://agentmods.dev/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit)

Your own site

<a href="https://agentmods.dev/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit"><img src="https://agentmods.dev/badge/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit"><img src="https://agentmods.dev/badge/skills/lionkiii/claude-seo-skills/seo-lighthouse-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,405 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00078	$0.02405
Opus 5	$0.00039	$0.01203
Sonnet 5	$0.00016	$0.00481
Haiku 4.5	$0.00008	$0.00241

Measured 12d ago against content hash cfe7b07cc357, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

seo-lighthouse-audit scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=<url>&category=performance&category=seo&category=best-practices&category=accessibility&strategy=mobile" -o /tmp/psi.json

skills/seo-lighthouse-audit/SKILL.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Lighthouse Audit & Fix Mapping

Lighthouse is Google's open-source page quality tool. It runs a series of audits against a URL and scores four categories: Performance, Accessibility, Best Practices, and SEO. Reference: https://developer.chrome.com/docs/lighthouse/overview

Scope notes (keep the report honest):

PWA category was removed in Lighthouse v12 (2024). Do NOT score or report a PWA category. If the user asks for it, explain it no longer exists.
Lighthouse is lab data — a single synthetic run on emulated hardware/network. Always recommend validating against CrUX field data (75th percentile of real users) before treating a score as ground truth. Delegate field-data analysis to the seo-core-web-vitals skill.
Agentic Browsing is a new experimental category (llms.txt, WebMCP tools, accessibility-for-agents). It is informational only — it reports a pass ratio, not a 0-100 score. See https://developer.chrome.com/docs/lighthouse/agentic-browsing/scoring

Inputs

Input	Required	Default
URL to audit	Yes	—
Strategy (mobile/desktop)	No	mobile
Categories	No	performance, seo, best-practices, accessibility

Execution

Detect a local Lighthouse CLI:
```
npx lighthouse --version 2>/dev/null || which lighthouse
```
Requires Chrome installed locally. If either succeeds, prefer the CLI path (step 2); otherwise fall back to the PageSpeed Insights API (step 3).

CLI path — run headless and write JSON to a temp file:

npx lighthouse <url> --output=json \
  --output-path=/tmp/lh-report.json \
  --chrome-flags="--headless" --quiet

For desktop strategy add --preset=desktop.

API fallback — PageSpeed Insights v5 (no API key needed for light use; add &key= if one is configured):
```
curl -s "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=<url>&category=performance&category=seo&category=best-practices&category=accessibility&strategy=mobile" -o /tmp/psi.json
```
The Lighthouse result lives under .lighthouseResult. Docs: https://developers.google.com/speed/docs/insights/v5/get-started Bonus: the same response embeds CrUX field data under loadingExperience — surface it as a lab-vs-field sanity check.

Read the full file on GitHub · 154 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 154 lines · 78 tokens per session scan A cfe7b07cc357

Subscribe to this mod's changes

seo-lighthouse-audit is a skill published in the GitHub repository lionkiii/claude-seo-skills (20 stars, last pushed 3mo ago), licensed MIT. It adds 78 tokens to every session and 2,405 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Analytics and metrics Claude Code Marketing and SEO ahrefs ai-seo anthropic backlinks claude-code-skills

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