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Use when establishing visual foundations for a new product, when defining design tokens, when building or auditing a component library, before any UI work begins on a fresh codebase, or when the existing UI has drifted into hex codes and magic numbers.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Use when implementing features or fixing bugs test-first, when user mentions "red-green-refactor", when test discipline is required for a specific task, when incremental-implementation needs TDD enforcement, or when a behavior change needs a failing test before any code is written.
Use when .forge/prd.md exists and the system needs a structural design before task breakdown, when modules will be implemented in parallel and need interface contracts to prevent integration failures, or when non-obvious technical decisions need to be recorded for future reference.
Use when .forge/prd.md and .forge/architecture.md exist and the work needs to be decomposed before implementation, when sizing tasks for a sprint, when mapping dependencies between modules, or when a critical path needs to be identified before parallel work begins.
Use when user wants to write a spec, create a PRD, or plan a new feature before implementation begins, when .forge/idea-brief.md exists and is ready to formalize, when requirements need to be captured before architecture or planning, or when a feature's scope and acceptance criteria need to be documented.
Use when creating a new forge-skill, editing an existing skill, when planning to contribute to forge-skills, when a session has produced a one-off prompt that should be promoted to a skill, or when verifying a skill works before deployment.
Use when checking if .forge/ artifacts are stale after a change to requirements, architecture, or any upstream artifact. Use before running /build, /review, or /ship to confirm the artifact chain is consistent. Use when the user says "is anything out of date" or "what needs to be regenerated".
| name | design-system |
| description | Use when establishing visual foundations for a new product, when defining design tokens, when building or auditing a component library, before any UI work begins on a fresh codebase, or when the existing UI has drifted into hex codes and magic numbers. |
Define the visual + interaction foundation before features get built. Output is .forge/design-system.md — the semantic token layer (color, typography, spacing, radius, motion), the breakpoint and dark-mode rules, the primitive component inventory with all states, the gallery, the composition rules, and the documented anti-patterns. Consumed by every UI-shipping skill (incremental-implementation, interaction-patterns, accessibility, demo-narrative).
incremental-implementation| Thought | Reality |
|---|---|
| "We'll standardize later" | Later means 50 components with 50 different spacing values. Standardization costs nothing on day one, costs a refactor on day 200. |
| "Just use Tailwind defaults" | Defaults without a semantic mapping create implicit coupling to the framework. When the framework changes, every component breaks. |
| "Dark mode can wait" | Retrofitting dark mode costs 5x building it in. Every color picked without dark-mode awareness becomes a contrast bug. |
| "Loading states aren't important" | A component without a loading state is a component that lies about its readiness. The user sees a button that looks ready and isn't. |
| "Designer will fix it later" | The component shipped to production is the design. Later means never. |
| "It looks fine in Figma" | Figma is not the runtime. Real fonts render differently, real data overflows, real users have light/dark/HC modes. |
#3B82F6) anywhere in a component filepadding: 13px)disabled or loading stateborder-radius across two buttons in the same productPin down before tokens:
Two levels:
Reference tokens → Semantic tokens
gray-50, gray-100, ... → surface, surface-muted, border, text, text-muted
blue-500, blue-600, ... → accent, accent-hover, accent-active
red-500 → danger, danger-bg
Components use only semantic tokens. Never reference tokens directly. Dark mode is a remapping of semantic → reference tokens, not a rewrite.
Document every semantic token with: light hex, dark hex, WCAG contrast against its default partner, intended use.
0, 2, 4, 8, 12, 16, 24, 32, 48, 64). No values outside this scale.none, sm, md, lg, full). One canonical radius per component type.fast 150ms / normal 250ms / slow 400ms). 2 easings (standard, emphasized). Respect prefers-reduced-motion. For detailed motion conventions, generate and reference references/motion-system.md alongside the design-system artifact.sm 640 / md 768 / lg 1024 / xl 1280). Document which is the "design target."Every interactive primitive has default / hover / active / focus-visible / disabled / loading / error documented. Build the inventory:
| Primitive | States required |
|---|---|
| Button (primary, secondary, ghost, danger) | all 6 |
| Input (text, number, password, search) | all 6 + filled, with-error |
| Select / combobox | all 6 + open, with-search |
| Checkbox / radio / switch | all 6 + checked, indeterminate |
| Toast / banner | info, success, warning, error, with-action |
| Skeleton | matches every component that fetches |
Skeleton screens, not spinners, for content-shaped loading.
A single Storybook (or equivalent) page per primitive showing every state, every size, every variant in light + dark. The gallery is the design system documentation — code and Figma diverge; the gallery doesn't.
In .forge/design-system.md:
.forge/design-system.md written#[0-9a-fA-F]{6})px: and padding: values not in the scale)prefers-reduced-motion respected — no animation longer than 100ms when setoutline: none without a replacement)