You'll notice
Useful3 Signal2
Artifact design guidance now applies to Markdown too, with theme, titling and anti-generic rules.
What's wrong with this entry?
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What
The artifact-design skill is now loaded before writing any artifact, including plain Markdown ones, rather than only HTML. It adds rules for the viewer's three theme states, for titling, and for steering away from design defaults that read as obviously AI-generated.
Evidence
Load before writing any artifact, including Markdown ones
Strings lifted out of the shipped bundle, so the claim above can be checked against them.