frontend-design-system

frontend-design-system is a skill for Claude Code from oikon48/cc-frontend-skills. It costs 92 tokens per session (1,592 once invoked), scanned A, original, MIT.

A set of design guidelines for creating distinctive front-end interfaces such as landing pages, dashboards, and web applications.

In plain words
What is it for?
Use it when designing pages or UI components to choose contrasting typography, build a coherent color palette, and create a more individual visual style.
Why use it?
It helps avoid generic layouts, overused fonts and colors, excessive effects, and other patterns that make generated interfaces look alike.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the cc-frontend-skills plugin — 1 skill, 1 agent shipped together

Good fit Use it when designing pages or UI components to choose contrasting typography, build a coherent color palette, and create a more individual visual style.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/oikon48/cc-frontend-skills/frontend-design-system
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 oikon48/cc-frontend-skills --skill frontend-design-system
Clone the repo
git clone --depth 1 https://github.com/oikon48/cc-frontend-skills

Made for: Claude Code.

Or install cc-frontend-skills, the plugin that ships this one along with the rest of its 1 skill, 1 agent.

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.

agentmods badge for frontend-design-system

README.md
[![agentmods](https://agentmods.dev/badge/skills/oikon48/cc-frontend-skills/frontend-design-system/github.svg)](https://agentmods.dev/skills/oikon48/cc-frontend-skills/frontend-design-system)
Your own site
<a href="https://agentmods.dev/skills/oikon48/cc-frontend-skills/frontend-design-system"><img src="https://agentmods.dev/badge/skills/oikon48/cc-frontend-skills/frontend-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.

agentmods 80×15 button for frontend-design-system

Your own site · 80×15
<a href="https://agentmods.dev/skills/oikon48/cc-frontend-skills/frontend-design-system"><img src="https://agentmods.dev/badge/skills/oikon48/cc-frontend-skills/frontend-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,592 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00092 $0.01592
Opus 5 $0.00046 $0.00796
Sonnet 5 $0.00018 $0.00318
Haiku 4.5 $0.00009 $0.00159

Measured 11d ago against content hash a33f069168db, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

frontend-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 11d 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.

skills/frontend-design-system/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Frontend Design System

Overview

このスキルは、AIが生成しがちな「汎用的で無個性なデザイン」を避け、洗練された独自性のあるフロントエンドUIを作成するためのガイドラインです。

Anti-Patterns(避けるべきパターン)

以下のパターンは「AIスロップ美学」と呼ばれ、避けるべきです:

Typography(タイポグラフィ)

  • ❌ Inter, Roboto, Open Sans などの過度に使用されたフォント
  • ❌ すべてのテキストに同じフォントファミリーを使用
  • ❌ 標準的なフォントウェイトのみの使用

Colors(カラー)

  • ❌ 紫からピンクへのグラデーション
  • ❌ 汎用的な青/緑のアクセントカラー
  • ❌ 彩度の高すぎるネオンカラー
  • ❌ デフォルトのTailwindカラーパレットそのまま

Layout(レイアウト)

  • ❌ 左テキスト・右画像の標準ヒーローセクション
  • ❌ 3カラムの均等グリッド機能セクション
  • ❌ 中央揃えの単調なカードレイアウト

Effects(エフェクト)

  • ❌ 過度なぼかし効果(blur)
  • ❌ 全要素へのアニメーション適用
  • ❌ グラスモーフィズムの乱用

Best Practices(推奨パターン)

Typography

推奨フォントの組み合わせ例:

ヘッダー ボディ 特徴
Playfair Display Source Sans Pro クラシック&モダン
Space Grotesk Inter テック&ミニマル
Fraunces Work Sans エレガント&読みやすい
DM Serif Display DM Sans 統一感のある対比
Syne Outfit 大胆&現代的

タイポグラフィ原則:

  • 見出しと本文で異なるフォントファミリーを使用(セリフ×サンセリフの組み合わせ)
  • フォントウェイトのバリエーションを活用(300, 400, 600, 800)
  • レタースペーシングで視覚的階層を作成

Colors

カラーパレット構築原則:

プライマリ:ブランドアイデンティティを表す主色
セカンダリ:プライマリを補完する色(補色または類似色)
アクセント:CTAやハイライトに使用する注目色
ニュートラル:背景やテキストに使用するグレー系

独自性を出すテクニック:

  • HSL調整で微妙な色相のずれを作る
  • ダークモードでは彩度を下げ、明度を調整
  • セマンティックカラー(success, warning, error)もブランドに合わせて調整

Layout

差別化するレイアウトパターン:

  • 非対称グリッド(5:7, 2:3比率)
  • オーバーラップ要素とネガティブマージン
  • 斜めのセクション区切り
  • ベントグリッドと有機的な配置
  • 大胆な余白(ホワイトスペース)の活用

Animation & Motion

効果的なアニメーション原則:

  1. 高影響度の瞬間に集中

    • ページロード時の単一の調整されたアニメーション
    • ユーザーアクション(クリック、ホバー)への即座のフィードバック
    • 状態変化(成功、エラー)の視覚的表現
  2. タイミングの指針

    • マイクロインタラクション: 150-300ms
    • ページ遷移: 300-500ms
    • 複雑なアニメーション: 500-800ms
  3. イージング関数

    /* 推奨イージング */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-in-out-quart: cubic-bezier(0.76, 0, 0.24, 1);
    

Background & Texture

Read the full file on GitHub · 153 lines

Files

What ships with it

2 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.

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.

  1. 11d ago First seen · 153 lines · 92 tokens per session scan A a33f069168db

Subscribe to this mod's changes

frontend-design-system is a skill published in the GitHub repository oikon48/cc-frontend-skills (69 stars, last pushed 9mo ago), licensed MIT. It adds 92 tokens to every session and 1,592 once invoked, about $0.0005 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 2026-08-30.

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