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 bugrabilge/bilge-development-kit --skill web-design-guidelinesgit clone --depth 1 https://github.com/bugrabilge/bilge-development-kitWrote 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/bugrabilge/bilge-development-kit/web-design-guidelines)<a href="https://agentmods.dev/skills/bugrabilge/bilge-development-kit/web-design-guidelines"><img src="https://agentmods.dev/badge/skills/bugrabilge/bilge-development-kit/web-design-guidelines/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/skills/bugrabilge/bilge-development-kit/web-design-guidelines"><img src="https://agentmods.dev/badge/skills/bugrabilge/bilge-development-kit/web-design-guidelines.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 | $0.00039 | $0.01648 |
| Opus 5 | $0.00019 | $0.00824 |
| Sonnet 5 | $0.00008 | $0.00330 |
| Haiku 4.5 | $0.00004 | $0.00165 |
Grade A, and why
web-design-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 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.
How it starts
The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Design Guidelines
"The web is for everyone; design with inclusivity, clarity, and resilience as your compass."
When to Use
- Designing responsive web layouts
- Auditing sites for WCAG accessibility compliance
- Reviewing cross-browser compatibility issues
- Establishing design system foundations
- Optimizing web performance and Core Web Vitals
- Creating mobile-first or adaptive interfaces
Responsive Design
Mobile-First Approach
- Start with the smallest viewport and enhance upward
- Base styles serve mobile; use min-width media queries to add complexity
- Touch targets must be at least 44x44 CSS pixels (WCAG 2.5.5)
- Test at 320px, 375px, 768px, 1024px, 1440px breakpoints
Fluid Layouts
- Use relative units (%, vw, rem) instead of fixed px for widths
- Use clamp() for fluid typography:
font-size: clamp(1rem, 2.5vw, 2rem) - Set max-width on content containers (typically 1200-1440px) to prevent ultra-wide stretching
- Use CSS Grid for two-dimensional layouts; Flexbox for one-dimensional alignment
Breakpoint Strategy
- Define breakpoints based on content, not device names
- Common system: sm (640px), md (768px), lg (1024px), xl (1280px), 2xl (1536px)
- Avoid more than 4-5 breakpoints; complexity grows quickly
- Test between breakpoints, not just at them
Images and Media
- Use srcset and sizes for responsive images
- Serve WebP/AVIF with fallback to JPEG/PNG
- Set explicit width and height attributes to prevent layout shift
- Use aspect-ratio CSS property for responsive video/embed containers
Accessibility (WCAG 2.1 AA)
Perceivable
- Color contrast ratio: 4.5:1 for normal text, 3:1 for large text (18px+ bold or 24px+)
- Never rely on color alone to convey information; use icons, patterns, or text alongside
- Provide alt text for informational images; use alt="" for decorative images
- Captions for video; transcripts for audio content
- Ensure text can be resized to 200% without loss of content or functionality
Operable
- All functionality available via keyboard
- No keyboard traps; users can always Tab or Escape out
- Provide skip navigation links for screen reader users
- Avoid content that flashes more than 3 times per second
- Give users enough time to read and act; avoid auto-advancing carousels without pause controls
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 · 151 lines · 39 tokens per session scan A 327be885dfa9
web-design-guidelines is a skill published in the GitHub repository bugrabilge/bilge-development-kit (10 stars, last pushed 4mo ago), licensed MIT. It adds 39 tokens to every session and 1,648 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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