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 agentmods add skills/serkan-ozal/browser-devtools-claude/performance-auditnpx skills add serkan-ozal/browser-devtools-claude --skill performance-auditgit clone --depth 1 https://github.com/serkan-ozal/browser-devtools-claudeWrote 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/serkan-ozal/browser-devtools-claude/performance-audit)<a href="https://agentmods.dev/skills/serkan-ozal/browser-devtools-claude/performance-audit"><img src="https://agentmods.dev/badge/skills/serkan-ozal/browser-devtools-claude/performance-audit.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 | $0.00034 | $0.00498 |
| Opus 5 | $0.00017 | $0.00249 |
| Sonnet 5 | $0.00007 | $0.00100 |
| Haiku 4.5 | $0.00003 | $0.00050 |
Grade A, and why
performance-audit 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 5d 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
Performance Audit Skill
Analyze web page performance using Web Vitals and network timing metrics.
When to Use
This skill activates when:
- User asks about page performance or speed
- User wants to optimize load times
- User mentions slow page or poor user experience
- User needs Core Web Vitals metrics
- User asks about SEO performance factors
Capabilities
Web Vitals Analysis
- Get Core Web Vitals (
o11y_get-web-vitals)- LCP (Largest Contentful Paint)
- INP (Interaction to Next Paint)
- CLS (Cumulative Layout Shift)
- TTFB (Time to First Byte)
- FCP (First Contentful Paint)
Network Performance
- Analyze request timing (
o11y_get-http-requests) - Identify slow API calls
- Check resource sizes
- Find blocking resources
Visual Analysis
- Capture page at different load stages
- Identify layout shifts visually
- Check above-the-fold content
JavaScript Analysis
- Profile JavaScript execution
- Check for long tasks
- Identify render-blocking scripts
Performance Thresholds
| Metric | Good | Needs Work | Poor |
|---|---|---|---|
| LCP | ≤2.5s | 2.5-4s | >4s |
| INP | ≤200ms | 200-500ms | >500ms |
| CLS | ≤0.1 | 0.1-0.25 | >0.25 |
| TTFB | ≤800ms | 800-1800ms | >1800ms |
Audit Workflow
- Baseline: Get initial Web Vitals metrics
- Network: Analyze slow/large requests
- Resources: Check for render-blocking resources
- JavaScript: Look for long tasks
- Images: Check for unoptimized images
- Report: Summarize with recommendations
Common Issues
- Large unoptimized images
- Render-blocking CSS/JS
- Too many HTTP requests
- Slow server response (TTFB)
- Layout shifts from dynamic content
- Uncompressed resources
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.
- 5d ago First seen · 71 lines · 34 tokens per session scan A 325386422373
performance-audit is a skill published in the GitHub repository serkan-ozal/browser-devtools-claude (8 stars, last pushed 5mo ago), licensed MIT. It adds 34 tokens to every session and 498 once invoked, about $0.0002 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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