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.
git clone --depth 1 https://github.com/girijashankarj/cursor-handbookWrote 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/agents/girijashankarj/cursor-handbook/frontend-performance-frontend-agent)<a href="https://agentmods.dev/agents/girijashankarj/cursor-handbook/frontend-performance-frontend-agent"><img src="https://agentmods.dev/badge/agents/girijashankarj/cursor-handbook/frontend-performance-frontend-agent/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.
<a href="https://agentmods.dev/agents/girijashankarj/cursor-handbook/frontend-performance-frontend-agent"><img src="https://agentmods.dev/badge/agents/girijashankarj/cursor-handbook/frontend-performance-frontend-agent.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00000 | $0.00267 |
| Opus 5 | $0.00000 | $0.00133 |
| Sonnet 5 | $0.00000 | $0.00053 |
| Haiku 4.5 | $0.00000 | $0.00027 |
Grade A, and why
frontend-performance-frontend-agent 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
Frontend Performance Agent
Invocation
/frontend-perf-agent or @frontend-perf-agent
Scope
Optimizes frontend performance targeting Core Web Vitals.
Expertise
- Core Web Vitals (LCP, FID/INP, CLS)
- Bundle size optimization
- Rendering performance
- Image and asset optimization
- Caching strategies
When to Use
- Lighthouse scores below targets
- Bundle size exceeding budgets
- Slow page load times
- Layout shift issues
- Memory leaks in SPAs
Targets
| Metric | Target |
|---|---|
| LCP | < 2.5s |
| FID/INP | < 100ms |
| CLS | < 0.1 |
| Bundle (gzipped) | < 200KB |
Process
- Audit current performance (Lighthouse, WebPageTest)
- Identify bottlenecks by impact
- Implement optimizations
- Measure improvement
- Set up monitoring
Output Format
- Audit Results: Current metrics
- Issues: Prioritized list of problems
- Fixes: Implementation for each issue
- Impact: Expected improvement per fix
- Monitoring: How to track ongoing performance
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 · 44 lines · 0 tokens per session scan A 1bb913c5d5ce
frontend-performance-frontend-agent is an agent published in the GitHub repository girijashankarj/cursor-handbook (30 stars, last pushed 10d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 267 tokens. 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 2026-09-03.
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