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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 v2.1.223

Prototype skill: explicit build-now vs ask-first intake

You'll notice
Useful3 Signal0
Skills

Prototype requests now either get built straight away or get a few pointed questions first.

What

The prototype skill now makes the model choose between building immediately and asking first, rather than guessing.

Details
  • Build with stated assumptions when the request names a thing and its core interaction.
  • Ask two to four pointed questions and wait when the request only names an outcome.
  • Extra polish passes and browser or test harnesses are forbidden.
  • If the Artifact tool is unavailable, the model must not hunt for alternative hosting.
Evidence

Build the smallest page that proves the idea

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

See this entry in the whole of v2.1.223 →