UI Prototype Sprint
Spins up a quick interactive prototype to try a UI idea.
What it does
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.
Install in under a minute
Mac or Linux, after you download
unzip ui-prototype-sprint.zip -d ~/.claude/skills/Windows PowerShell
Expand-Archive ui-prototype-sprint.zip -DestinationPath $HOME\.claude\skills- Start a new Claude Code session so it sees the skill.
- Ask in plain words, for example: "Use UI Prototype Sprint on this project."
- Unzip the download, then zip just the ui-prototype-sprint folder if your computer added an extra folder.
- In Claude.ai, open Settings, then Capabilities, and upload it under Skills.
- Turn the skill on and ask Claude to use it.
UI Prototype Sprint uses the open SKILL.md format, so it also works in agents like Cursor, Gemini CLI, GitHub Copilot and Codex. Copy the ui-prototype-sprint folder into that agent's skills folder, for example .cursor/skills/ or .github/skills/ in your project.
What's inside
The 6 main sections of the SKILL.md, in order.
- Initial Response
- Operating Posture
- Hard Rules
- Workflow
- Invocation Variants
- Tone
In the download: LICENSE, NOTICE.md, PICKER.md, SKILL.md
Credit and license
UI Prototype Sprint is a renamed, packaged copy of prototype by Emil Kowalski (github.com/emilkowalski/skills), used under the MIT license. The license and a list of changes ship inside the download.
Questions
Does UI Prototype Sprint work in Claude.ai, not just Claude Code?
Yes. In Claude.ai, upload the ui-prototype-sprint folder as a zip in Settings under Capabilities. It also works in other agents that support Agent Skills, like Cursor, Gemini CLI and GitHub Copilot.
What do I get?
A zip with the ui-prototype-sprint folder: its SKILL.md (2,687 words) and its license files. One payment, instant download.
Who made UI Prototype Sprint?
It's a renamed, packaged copy of prototype by Emil Kowalski, used under the MIT license. The license and a list of changes ship inside the download.