Prototype Variants
Build several genuinely different versions of a UI piece and flip through them live in a visual picker
- What
- Build several genuinely different versions of a UI piece and flip through them live in a visual picker
- Cost
- Free
- Needs
- an agent able to render HTML previews for the visual picker
- Install
- Copy the installer prompt below into your Muse — your agent does the rest.
Curated by Skill Harbor — a divergence skill from Emil Kowalski's design-engineering philosophy: describe a piece of UI (a toast, a pricing card, a hold-to-delete button) and the agent builds several genuinely different versions — each a direction defensible on its own — behind a visual picker you flip through live to crown a winner. Every variant meets a strict craft bar (correct easing, sub-300ms motion, transform/opacity only, reduced-motion handled), and exploration never touches production code. By @emilkowalski, listed here with credit to its creator. Honest caveats: it only runs when explicitly invoked; it explores alternatives — it doesn't review existing UI or pick dependencies. Skill Harbor never reviews the code, review it yourself before use.
Version:
Install
Prerequisites: an agent able to render HTML previews for the visual picker Install "Prototype Variants" for me. Build several genuinely different versions of a UI piece and flip through them live in a visual picker Repository: https://github.com/emilkowalski/skills/blob/main/skills/prototype/SKILL.md 1. Fetch the SKILL.md file for the emilkowalski-prototype skill from the repository into a temporary folder and summarize what it does in one or two sentences. 2. Safety check: review the SKILL.md and scripts for anything suspicious (unexpected network calls, shell commands, credential harvesting). This repo should contain zero secrets in code, credentials only via the secure vault, allowed hosts declared in the SKILL.md. Verify that holds here; STOP on any red flag and tell me. 3. Install it as a skill: copy SKILL.md and its helper files into the agent's skills directory, in a folder named "emilkowalski-prototype". 4. Verify with no network calls: frontmatter valid, files in place. 5. Report what was installed, where, and what I still need to do myself (e.g. any accounts, API keys, or CLI tools mentioned in the prerequisites above). GitHub is optional: if I have a GitHub account or the gh CLI, you may use it; otherwise public access is fine. Never require it unless it's in the prerequisites above. Rules: don't touch anything outside the temp folder and the install target. Never ask me to paste secrets in chat — credentials go through the secure vault or environment variables. If anything looks off, stop and ask me.
Questions
How do I install a build?
Every product page includes a copy-paste install prompt. Paste it into your Muse and it sets the build up for you — no manual configuration.
Where does my money go?
Straight to the seller. Skill Harbor never processes payments: checkout happens on the seller’s own page, usually Stripe.
What does the ✓ next to a creator’s name mean?
It means we confirmed the identity of the person behind the listing. It says nothing about the code itself — always check a build before installing it.