SkillsBench is a benchmark for measuring how effectively AI agents use modular skills—folders containing instructions, scripts, and resources—to complete specialized tasks. It helps researchers and developers evaluate both skill quality and agent behavior, including tasks that require combining multiple skills. The catalogue’s skills and instructions are evaluated as part of this workflow.
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 benchflow-ai/skillsbench --skill web-interface-guidelinesgit clone --depth 1 https://github.com/benchflow-ai/skillsbenchWrote 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/benchflow-ai/skillsbench/web-interface-guidelines)<a href="https://agentmods.dev/skills/benchflow-ai/skillsbench/web-interface-guidelines"><img src="https://agentmods.dev/badge/skills/benchflow-ai/skillsbench/web-interface-guidelines.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 | $0.00045 | $0.00695 |
| Opus 5 | $0.00023 | $0.00347 |
| Sonnet 5 | $0.00009 | $0.00139 |
| Haiku 4.5 | $0.00005 | $0.00069 |
Grade A, and why
web-interface-guidelines 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 3d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- web-interface-guidelines — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Interface Guidelines
Review UI code for compliance with Vercel's web interface standards.
Quick Reference - Visual Stability
| Issue | Rule |
|---|---|
| Images without dimensions | <img> needs explicit width and height (prevents CLS) |
| Font loading flash | Critical fonts: <link rel="preload" as="font"> with font-display: swap |
| Large lists | Virtualize lists >50 items (content-visibility: auto) |
| Layout reads in render | No getBoundingClientRect, offsetHeight in render path |
Full Rules
Images
<img>needs explicitwidthandheight(prevents CLS)- Below-fold images:
loading="lazy" - Above-fold critical images:
priorityorfetchpriority="high"
Performance
- Large lists (>50 items): virtualize (
virtua,content-visibility: auto) - No layout reads in render (
getBoundingClientRect,offsetHeight,offsetWidth,scrollTop) - Batch DOM reads/writes; avoid interleaving
- Add
<link rel="preconnect">for CDN/asset domains - Critical fonts:
<link rel="preload" as="font">withfont-display: swap
Accessibility
- Icon-only buttons need
aria-label - Form controls need
<label>oraria-label - Interactive elements need keyboard handlers (
onKeyDown/onKeyUp) <button>for actions,<a>/<Link>for navigation (not<div onClick>)- Images need
alt(oralt=""if decorative)
Focus States
- Interactive elements need visible focus:
focus-visible:ring-*or equivalent - Never
outline-none/outline: nonewithout focus replacement - Use
:focus-visibleover:focus(avoid focus ring on click)
Animation
- Honor
prefers-reduced-motion(provide reduced variant or disable) - Animate
transform/opacityonly (compositor-friendly) - Never
transition: all—list properties explicitly
Forms
- Inputs need
autocompleteand meaningfulname - Use correct
type(email,tel,url,number) andinputmode - Never block paste (
onPaste+preventDefault) - Labels clickable (
htmlForor wrapping control)
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 3d ago First seen · 77 lines · 45 tokens per session scan A 4ecd4428603a
web-interface-guidelines is a skill published in the GitHub repository benchflow-ai/skillsbench (1,747 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 45 tokens to every session and 695 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 2026-09-03.
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