What is design-system?

Instructions for using the Aurora Fluid design system, including its color format, animation levels, component weights, CSS structure, and theming rules.

Use them when choosing colors, adding animations, selecting component sizes, or changing themes in the UI Kit.

They keep new or changed interface code consistent with the project's visual rules and accessibility-related motion settings.

design-system — Skill for Claude Code by annondeveloper/ui-kit

Install

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.

Any agent

npx skills add annondeveloper/ui-kit --skill design-system

Clone the repo

git clone --depth 1 https://github.com/annondeveloper/ui-kit

Made for: Claude Code.

Or install ui-kit, the plugin that ships this one along with the rest of its 5 skills, 2 agents, 1 hook.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/annondeveloper/ui-kit/design-system/github.svg)](https://agentmods.dev/skills/annondeveloper/ui-kit/design-system)

Your own site

<a href="https://agentmods.dev/skills/annondeveloper/ui-kit/design-system"><img src="https://agentmods.dev/badge/skills/annondeveloper/ui-kit/design-system/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/annondeveloper/ui-kit/design-system"><img src="https://agentmods.dev/badge/skills/annondeveloper/ui-kit/design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 652 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00055	$0.00652
Opus 5.5	$0.00022	$0.00261
Sonnet 5.5	$0.00011	$0.00130
Haiku 4.5	$0.00006	$0.00065

Measured 1mo ago against content hash fc3bd5289373, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

design-system 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 1mo 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.

plugins/claude-code/skills/design-system/SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Aurora Fluid Design System

@annondeveloper/ui-kit uses the Aurora Fluid design identity. Here are the key principles:

OKLCH Color System

All colors use OKLCH — perceptually uniform, with relative color syntax for theming:

/* Base color */
--brand: oklch(65% 0.2 270);

/* Derived with relative syntax */
--brand-light: oklch(from var(--brand) calc(l + 0.15) c h);
--brand-dark: oklch(from var(--brand) calc(l - 0.15) c h);
--brand-subtle: oklch(from var(--brand) l c h / 0.1);

Never use hex or rgb. Always OKLCH.

Motion Levels (0-3)

Level	Name	Behavior
0	None	Instant transitions, no animation
1	Subtle	CSS transitions only, no springs
2	Expressive	Conservative spring (no overshoot)
3	Cinematic	Full physics — spring, bounce, particles

Cascade: OS prefers-reduced-motion > component motion prop > CSS --motion > UIProvider > default (3)

Weight Tiers

Lite (~0.3-1.2 KB/component) — CSS-only, native HTML elements, no JS animation
Standard (~2-5 KB/component) — Full features, useStyles() CSS injection, motion engine
Premium (~3-6 KB/component) — Aurora glow, spring entrance, shimmer, particles

CSS Architecture

@layer components for all component styles
@scope (.ui-component) for isolation
Class prefix: ui- (e.g., .ui-button, .ui-card)
Logical properties only (margin-inline-start, not margin-left)
text-wrap: balance for headings, text-wrap: pretty for body
Fluid sizing: clamp() values, rem/em units (never px for font-size)

Theme Generation

import { generateTheme, applyTheme } from '@annondeveloper/ui-kit/theme'

// Generate from any brand color
const theme = generateTheme('#6366f1', 'dark')
applyTheme(theme) // Sets CSS custom properties on :root

Accessibility Requirements

WCAG AA contrast (4.5:1 text, 3:1 UI)
44px minimum touch targets
WAI-ARIA patterns for all composite widgets
@media (forced-colors: active) support
prefers-reduced-motion always respected

Read the full file on GitHub · 70 lines

Changes

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.

1mo ago First seen · 70 lines · 55 tokens per session scan A fc3bd5289373

Subscribe to this mod's changes

design-system is a skill published in the GitHub repository annondeveloper/ui-kit (0 stars, last pushed 4mo ago), licensed MIT. It adds 55 tokens to every session and 652 once invoked, about $0.0002 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 2026-08-31.

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