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/plugin87/full-stack-design-skills/design-fundamentalsnpx skills add plugin87/full-stack-design-skills --skill design-fundamentalsgit clone --depth 1 https://github.com/plugin87/full-stack-design-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/skills/plugin87/full-stack-design-skills/design-fundamentals)<a href="https://agentmods.dev/skills/plugin87/full-stack-design-skills/design-fundamentals"><img src="https://agentmods.dev/badge/skills/plugin87/full-stack-design-skills/design-fundamentals.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 | $0.00086 | $0.03777 |
| Opus 5 | $0.00043 | $0.01888 |
| Sonnet 5 | $0.00017 | $0.00755 |
| Haiku 4.5 | $0.00009 | $0.00378 |
Grade A, and why
design-fundamentals 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 — 417 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Fundamentals
A comprehensive guide to universal design principles applicable across all digital products, frameworks, and platforms.
Core Principles Overview
Design fundamentals are the bedrock of every digital product. They transcend frameworks, tools, and trends. Whether you're designing in Figma, building components in React, or architecting a design system, these principles apply universally.
The five pillars:
- Color — How color creates meaning, contrast, hierarchy, and mood
- Typography — Font selection, sizing, weight, and spacing for readability
- Layout & Grid — Structural systems that organize information
- Spacing & Scale — Visual breathing room and proportion
- Contrast & Hierarchy — Guiding attention and creating relationships
1. Color Theory & Application
Color Fundamentals
Color Dimensions (HSL model):
- Hue (0-360°) — The color itself (red, blue, yellow, etc.)
- Saturation (0-100%) — Color intensity (gray is 0%, pure color is 100%)
- Lightness (0-100%) — Brightness (0% = black, 100% = white, 50% = pure color)
Web designers typically work in:
- HEX — #FF5733 (shorthand: #F57)
- RGB/RGBA — rgb(255, 87, 51) with opacity
- HSL — hsl(10, 100%, 60%)
Color Relationships
Complementary — Colors opposite on the color wheel. High contrast, use for CTAs and accents.
Analogous — Colors adjacent on the wheel. Harmonious, calming, use for neutral palettes.
Triadic — Three colors evenly spaced. Vibrant, balanced, use for playful interfaces.
Monochromatic — One hue in different saturations/lightnesses. Elegant, professional, use for coherent systems.
Accessibility & Contrast
WCAG Standards (minimum contrast ratios):
- Normal text — 4.5:1 (AA) or 7:1 (AAA)
- Large text (18pt+ or 14pt+ bold) — 3:1 (AA) or 4.5:1 (AAA)
- UI Components & borders — 3:1 (AA)
Checking contrast:
- Use WebAIM Contrast Checker, Accessible Colors, or browser DevTools
- Never rely on color alone; pair with icons, patterns, or text
- Dark mode requires separate contrast checks — don't assume 1:1 translations
What ships with it
3 files 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.
- 5d ago First seen · 417 lines · 86 tokens per session scan A 303bc7b26b3c
design-fundamentals is a skill published in the GitHub repository plugin87/full-stack-design-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 86 tokens to every session and 3,777 once invoked, about $0.0004 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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