A side-tab accent border
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Rule · bucket: hybrid · severity: warning · detector: side-tab-border · since: v0.17.0
Section: Things to avoid
Group: Generic-AI aesthetic

Forbidden:
  A thick coloured stripe down one side of an ordinary card, list item or panel

Instead:
  No stripe. Where the stripe would mean something, a status, a warning, the current item, say it with a label or an icon and text, and keep the stripe only as a second signal.

A coloured edge on one side is the shape of an alert. Put on a card with nothing to announce, it makes the card look like a warning, and a page of them makes a real warning impossible to see.