Use ONLY when the user explicitly asks for several versions of a UI piece to compare, or when the frontend-stack router delegates a comparison of design directions. Builds multiple genuinely different versions behind a visual picker so the user can flip through them live and promote the one that feels right.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Prototyping Variants
## Initial Response
When this skill is first invoked without a specific question, respond only with:
> I'm ready to build several genuinely different versions of a UI piece for you to flip through, my craft bar comes from Emil Kowalski's design engineering philosophy.
Do not provide any other information until the user asks a question.
A divergence skill. It does ONE thing: take a described piece of UI ("a toast", "the pricing card", "a hold-to-delete button"), build several genuinely different versions of it, and put them behind a visual picker so the user can flip through them live and choose a winner. It does not review existing UI (that's `review-animations`), plan fixes for it (that's `improve-animations`), or choose dependencies (that's `pick-ui-library`).
## Operating Posture
You are a senior design engineer running a design exploration. The entire value of this skill is **divergence**: three tints of the same idea waste the picker — the user learns nothing by flipping between them. Each variant must be a direction you could defend shipping on its own, exploring a genuinely different answer to the same brief.
…
The line at the top of this page pins the label git:20261010.12d6357, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_c7de27xkp7x5ivje
GET https://markdownregistry.com/api/v1/resolve?ref=jaimejunr/claude-code-frontend-skills/prototype
GET https://markdownregistry.com/api/v1/blob/3f4bd1ee91b8fb7009f892f53f2df9f4a59cfbe62a8549ab6abd99a023e64587
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
jaimejunr/claude-code-frontend-skills · plugins/design-mobile-apps/skills/design-mobile-apps/SKILL.md · Use ONLY when the user asks to design mobile app screens with Sleek, edit a Sleek project, or implement a Sleek design…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/animate/SKILL.md · Build an animation from scratch, making the decisions in the order that determines whether it feels right — should it…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/animation-vocabulary/SKILL.md · Reverse-lookup glossary that turns a vague description of a web animation or motion effect into its exact term ("the…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/apple-design/SKILL.md · Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/ask-sonner/SKILL.md · Guide to Sonner, the React toast library — install and wire up the Toaster, pick the right toast() call, promise and…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/emil-design-eng/SKILL.md · This skill encodes Emil Kowalski's philosophy on UI polish, component design, animation decisions, and the invisible…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/find-animation-opportunities/SKILL.md · Search a codebase or UI for places that don't animate but should, and reject everything that shouldn't. Read-only; it…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/improve-animations/SKILL.md · Survey a codebase's animation and motion code as a senior motion advisor, then produce a prioritized audit and…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/mobile-native/SKILL.md · Make a web app feel native on a phone — the small CSS and meta-tag fixes that separate "a website in a browser" from…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/pick-ui-library/SKILL.md · Use ONLY when the user asks which library to use, or when the frontend-stack router delegates a library pick. Picks the…
jaimejunr/claude-code-frontend-skills · plugins/emil-design-eng/skills/review-animations/SKILL.md · Use ONLY when the user asks to review motion, or when the frontend-stack router or ui-reviewer agent delegates a motion…
jaimejunr/claude-code-frontend-skills · plugins/emil-native/skills/animate-expo/SKILL.md · Build animations in React Native and Expo, making the decisions in the order that determines whether they feel right —…
emilkowalski/skills · skills/prototype/SKILL.md · Build multiple genuinely different versions of a UI piece you describe, rendered behind a visual picker so you can flip…
nightly-labs/openbot · .agents/skills/prototype/SKILL.md · Build several different design directions (3 by default) for a feature or issue as Storybook stories, show them to the…
plugin87/ux-ui-agent-skills · .claude/skills/prototype/SKILL.md · Move an idea up the fidelity ladder (content-first → wireframe → low-fi → high-fi → code) with a validation plan at…
mxyhi/ok-skills · prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
tobihagemann/turbo · claude/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
tobihagemann/turbo · codex/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
asymmetric-al/core · .agents/skills/prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
