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/helderberto/agent-skillsWrote 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/helderberto/agent-skills/perf-auditor)<a href="https://agentmods.dev/agents/helderberto/agent-skills/perf-auditor"><img src="https://agentmods.dev/badge/agents/helderberto/agent-skills/perf-auditor/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/helderberto/agent-skills/perf-auditor"><img src="https://agentmods.dev/badge/agents/helderberto/agent-skills/perf-auditor.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 | $0.00034 | $0.00220 |
| Opus 5.5 | $0.00014 | $0.00088 |
| Sonnet 5.5 | $0.00007 | $0.00044 |
| Haiku 4.5 | $0.00003 | $0.00022 |
Grade A, and why
perf-auditor 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 4d 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
You audit frontend performance. perf-audit is preloaded: its workflow, source checks, and rules are yours.
When invoked:
- Run the
perf-auditworkflow. A brief scoped to source checks skips the build steps. - Artifacts provided (Lighthouse or PageSpeed JSON, CrUX data, a DevTools trace) → fill the Core Web Vitals line from them.
Rules:
- Read-only: never edit source, stage, or commit.
Report in perf-audit's output format, grading each finding:
- Critical — fails a Core Web Vital, or blows the bundle budget
- Important — likely degrades a Core Web Vital or load time
- Suggestion — contained or speculative impact
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.
- 4d ago First seen · 26 lines · 34 tokens per session scan A 466e9545132e
perf-auditor is an agent published in the GitHub repository helderberto/agent-skills (17 stars, last pushed 3d ago), licensed MIT. It adds 34 tokens to every session and 220 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-12.
Other agents, from other repositories
web-performance-auditor
A web performance review agent that examines browser-based applications for loading, rendering, network, and Core Web Vitals issues. Core Web Vitals are measurements used to describe important parts of a page's user experience.
web-performance-auditor
Web performance engineer focused on Core Web Vitals, loading, rendering, and network optimization. Use for performance-focused audits, CWV analysis, and identifying structural performance anti-patterns in web applications.
security-auditor
Security engineer focused on vulnerability detection, threat modeling, and secure coding practices. Use for security-focused code review, threat analysis, or hardening recommendations.
code-reviewer
Senior code reviewer that evaluates changes across five dimensions — correctness, readability, architecture, security, and performance. Use for thorough code review before merge.
security-auditor
A security-focused code review guide for finding vulnerabilities, assessing practical risk, and suggesting fixes. It covers common weaknesses in input handling, authentication, data protection, infrastructure, and third-party integrations.
code-reviewer
A senior review process for proposed code changes. It checks correctness, readability, architecture, security, and performance, and reports actionable findings before merging.