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.
npx skills add berkcangumusisik/claude-code-practices --skill lighthouse-fixgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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.
[](https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/lighthouse-fix)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/lighthouse-fix"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/lighthouse-fix.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00014 | $0.00338 |
| Opus 5 | $0.00007 | $0.00169 |
| Sonnet 5 | $0.00003 | $0.00068 |
| Haiku 4.5 | $0.00001 | $0.00034 |
Grade A, and why
lighthouse-fix scanned grade A with 0 findings 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 7d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Lighthouse Performance Fixes
Target: $1
Since we can't run Lighthouse directly, audit the code for common score killers:
Performance (LCP, FID, CLS)
Largest Contentful Paint (LCP):
grep -rn "img\|Image\|hero\|banner" src/ --include="*.tsx" | head -10
- Hero images not preloaded (
<link rel="preload">orpriorityprop) - No explicit
width/heighton images (causes layout shift) - Render-blocking scripts/fonts
Cumulative Layout Shift (CLS):
- Images without dimensions
- Dynamic content inserted above existing content
- Fonts causing FOUT (missing
font-display: swap)
First Input Delay (FID) / INP:
- Long tasks on main thread
- Heavy JS in
<head>withoutdefer/async
Accessibility Score
grep -rn "<img" src/ --include="*.tsx" | grep -v "alt=" | head -10
- Missing
alton images - Low color contrast
- Missing form labels
Best Practices
- Mixed content (HTTP resources on HTTPS page)
- Console errors
- Deprecated APIs
For each finding: show the fix and estimated score improvement.
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.
- 7d ago First seen · 49 lines · 14 tokens per session scan A 625b5a57b540
lighthouse-fix is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 14 tokens to every session and 338 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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