Break
This skill takes one component and renders it on a fresh page under every scenario that can actually reach it. That page is the deliverable: a visual report the user scrolls through, every state side by side, with the breaks marked. A component built against one happy path looks finished right up until real content arrives.
It observes rather than judges. A finding here is something that visibly broke on the page, named in the vocabulary of the domain skill that owns the fix. Reviewing code against a standard is interface-review and better-interface; exploring design alternatives is variant.
Where variant insists on the real page, this skill isolates on purpose. You are not judging how the component looks in context. You are checking whether it defends itself when the content is worst-case.
The whole run is build, look once, report: minutes, not a session. The work is rendering an existing component with different props, and nothing in it justifies instrumentation, browser debugging or a second pass.
1. Scope one component
One component per run. "The settings page" is not a component; the profile form's text input is. Where the request spans several, list the candidates and ask which one to test, rather than picking on the user's behalf.
Restate what the component is in one sentence: what it accepts, what it renders and where it will live.
2. Infer the scenarios from the component
Stress only what varies. A scenario earns a slot when the component accepts something that can take that shape in production. So read the component first: its props, its slots, its states and the data it renders.
scenarios.md holds the axes, the values on each and the cue that says whether an axis applies. Walk it against the component and keep only the axes whose cue matches. A text input gets content length and states, never item quantity. A static icon button with a fixed label gets container and environment, never long text.
Write the kept scenarios down before building, one line each, so the harness renders a planned set rather than whatever came to mind. Then say which axes you dropped and why, in one line, so a wrong inference is cheap to catch.
3. Build the harness page
One throwaway page, holding the real component imported from the project, rendered once per scenario in a single column with a short text label above each instance.
The component ships untouched, in its real environment. A scratch route inside the app gives it the app's own layout, fonts and global styles for free. Labels, container widths and fixture props are everything the page adds: no fonts or styles of its own, no simulated themes or token swaps, no probes. A component observed under any of those is a different component.
Widths are scenarios on the page. Render the width cases inside fixed-width containers beside the full-width one, so a single load shows every width and nothing ever gets resized.