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Use for UI/UX design, product flows, frontend or native interface design, design audits, design translation, asset planning, motion direction, design tokens, or distinctive non-generic apps and websites. Covers web and React, Windows and WinUI/Mica, Apple and SwiftUI, Android and Jetpack Compose/Material, cross-platform UI, and token export. Route to the focused skill, then load only the references required for the selected surface and failure mode.
Passed 21 of 22 test cases with the skill, and 5 of 22 without it.
and 25 more in the full report
16 fixed5 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 16 test cases the skill fixed. Same model, same prompt, with and without the skill.
Our Android app using Jetpack Compose needs a visual refresh. What skill file governs this platform, and what is the limit on core references to load initially?
| Checked | Without skill | With skill |
|---|---|---|
| The response identifies skills/android-design/SKILL.md as the platform skill. | Missed | Passed |
| The response specifies loading exactly two core references for the selected surface. | Missed | Passed |
The instructions your model reads when the skill loads.
Stark is a design router for AI coding agents. Use it to make product, platform, visual, interaction, and quality decisions before implementation.
Keep context proportional to the task:
Do not read the entire reference library. Use references/ui-patterns/README.md, references/ux-patterns/README.md, and references/web-patterns/README.md as catalogs when the tables below do not cover the request.
| Request | Routed skill |
|---|---|
| Web UI, landing page, dashboard, React, Next, Astro, Tailwind | skills/web-design/SKILL.md |
| Product flow, onboarding, checkout, IA, usability, forms | skills/ux-design/SKILL.md |
| Windows, WinUI, WPF, Fluent | skills/windows-design/SKILL.md |
| Apple, iOS, iPadOS, macOS, SwiftUI | skills/apple-design/SKILL.md |
| Android, Material, Jetpack Compose | skills/android-design/SKILL.md |
| Tauri, Electron, React Native, Flutter, CMP, shared UI | skills/cross-platform-design/SKILL.md |
| Design tokens, themes, token export | skills/design-tokens/SKILL.md |
| Platform is genuinely unclear | skills/design-router/SKILL.md |
Combine UX with one platform skill when the request includes both workflow and implementation. Preserve the UX brief when platform guidance is applied.
Use scripts/detect_platform.py only as a deterministic fallback. Treat ambiguous as a request for one short clarification, not permission to default to web.
Choose one primary bundle. Read its two core references. Add conditional references only when their trigger is present.
Core:
test cases passed, vs 5 / 22 without
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