You'll notice
Useful2 Signal2
Claude loads the design skill before writing any artifact, Markdown included, except workshop docs.
What's wrong with this entry?
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What
Claude must load the design skill before writing an artifact file whether the output is HTML or Markdown, and choosing the format is treated as part of the design decision rather than a shortcut. Workshop documents remain the one exception.
Evidence
Format is part of that decision: choose Markdown because the deliverable calls for it, never for speed.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.