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break-ui

100 / 100 · Low risk

Fine to try.

By emilkowalski/skills (GitHub) · design · 56,776 stars · scanned at commit 0f2e23b

Try to break a piece of UI by feeding it worst-case data — long names, unbreakable emails, one-letter names, missing fields, huge counts, zero items, long labels, non-Latin text, emoji, extreme numbers — then render it behind a "Demo data / Worst case" toggle and report everything that broke, with the fix for each. Use when the user asks to stress-test, break, or find edge cases in a component or screen, or to "try the worst case". For visual design critique use emil-design-eng; for motion use …

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'break-ui' ] || [ -L ~/.agents/skills/'break-ui' ]; then echo 'A skill folder named break-ui already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/emilkowalski/skills' "$d" && git -C "$d" checkout --quiet '0f2e23b32bb1265e84cff8d3e75785fec953fb1b' -- 'skills/break-ui' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/break-ui' ~/.agents/skills/'break-ui' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'break-ui' ~/.claude/skills/'break-ui' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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