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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.238

The /design skill prompt was rewritten and its page seeder gained warnings

You'll notice
Useful3 Signal3
Skills not in their notes

The /design skill got stricter rules and now demands a path, a description and a favicon emoji.

Feature flag
tengu_ethereal_nova Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.238: off

Read once, for one account on one subscription tier, against v2.1.238. It isn't a statement about your account. What a flag value here can and cannot tell you

/design
What

The design skill's instructions were tightened and given new rules, including what to do when no human is available to answer questions: commit to one direction and build the deliverable. Publishing now requires a file path, a one-line description and a one or two emoji favicon, repeated on every republish. The skill ships inside a payload behind the flag tengu_ethereal_nova, so whether you see it is decided by server configuration.

Details
  • Explicit frame sizes are specified: phone 390x844, desktop 1440x900, with print work authored at 96 pixels per inch.
  • Artboards are required to share no state at runtime, and the dataviz helper is to be loaded for charts.
  • The page seeder now warns when a template value is followed by a ternary inside a style attribute, which silently renders as invalid CSS, and when artboards overlap.
  • The seeder tolerates a published page whose state block opener has a server-added data-id attribute, stores images under their basename, and fails when the state block still contains the placeholder title.
Evidence

hasTernaryAfterHole

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.238 →