Build multiple genuinely different versions of a UI piece you describe, rendered behind a visual picker so you can flip through them live and promote the one that feels right. Only runs when explicitly invoked; it does not trigger on its own.
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
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.
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The line at the top of this page pins the label git:20260827.ca77bd1, 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_tu6kjz665oe5vidh
GET https://markdownregistry.com/api/v1/resolve?ref=nebutra/nebutra-sailor/prototype
GET https://markdownregistry.com/api/v1/blob/2ad8401c4deaddb54947fb65247f790e7b3d8784e35312bcbedbfb1d59cd89ce
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.
nebutra/nebutra-sailor · .agents/skills/animate-expo/SKILL.md · Build animations in React Native and Expo, making the decisions in the order that determines whether they feel right —…
nebutra/nebutra-sailor · .agents/skills/animate/SKILL.md · Build an animation from scratch, making the decisions in the order that determines whether it feels right — should it…
nebutra/nebutra-sailor · .agents/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…
nebutra/nebutra-sailor · .agents/skills/apple-design/SKILL.md · Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing…
nebutra/nebutra-sailor · .agents/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…
nebutra/nebutra-sailor · .agents/skills/emil-design-eng/SKILL.md · This skill encodes Emil Kowalski's philosophy on UI polish, component design, animation decisions, and the invisible…
nebutra/nebutra-sailor · .agents/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…
nebutra/nebutra-sailor · .agents/skills/improve-animations/SKILL.md · Survey a codebase's animation and motion code as a senior motion advisor, then produce a prioritized audit and…
nebutra/nebutra-sailor · .agents/skills/pick-ui-library/SKILL.md · Pick the right library for a given frontend task from a curated, opinionated list — numbers, OTP inputs, charts…
nebutra/nebutra-sailor · .agents/skills/review-animations/SKILL.md · Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy…
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…
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…
swingerman/engineer · engineer/skills/prototype/SKILL.md · Use to rough out a working thing fast, zero ceremony, before committing to the pipeline — the prototype IS the spec…
