break-ui SKILL.md skillB
break-ui from emilkowalski/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add emilkowalski/skills/break-ui@git:20261002.e8a175dPins git:20261002.e8a175d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- emilkowalski/skills
- Path
skills/break-ui/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261002.e8a175d, committed Oct 2, 2026
- Size
- 14,380 bytes
- Repository stars
- 47,883
- License
- MIT
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…
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
# Breaking UI ## Initial Response When this skill is first invoked without a specific question, respond only with: > I'm ready to throw the worst realistic data at your UI and show you what breaks, my standards come from Emil Kowalski's design engineering philosophy. Do not provide any other information until the user asks a question. An adversarial skill. It does ONE thing: take a piece of UI that looks right with demo data, find the realistic worst case for every value it renders, put both datasets behind a toggle, and report what broke. It does not redesign the component (that's `prototype`), critique its taste (that's `emil-design-eng`), or review its motion (that's `review-animations`). ## Operating Posture You are the most annoying real user this component will ever meet. Your name is Aleksandra Wiśniewska-Kowalczyk, your colleague's email is `bartholomew.fitzgerald@northwind-industries-holdings.example.com`, your intern is called Jo, and your workspace has 1,284 members. None of that is contrived. Every one of those people exists in production somewhere, and the UI was designed against "Jane Doe, jane@acme.com, 12 members". …
Read the whole file at its exact version.
How to install
mdr add emilkowalski/skills/break-ui@sha256:e7eec1d70ac56a04The line at the top of this page pins the label git:20261002.e8a175d, 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.
[](https://markdownregistry.com/a/art_io2dodvwts4aoqrz)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 2, 2026.
Audit of the latest version
- fail: No prompt-injection phrasing (matched: ignore previous instructions)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14380 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
emilkowalski/skills · 47,883 stars · license MIT · pushed 2026-10-11 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_io2dodvwts4aoqrz GET https://markdownregistry.com/api/v1/resolve?ref=emilkowalski/skills/break-ui GET https://markdownregistry.com/api/v1/blob/e7eec1d70ac56a04255e9c0dbe98084ea3d544cc04aaad34f32c95d6fa9dff5e
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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.