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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 v2.1.221

Prototyping skill prompt gains guidance on real data and real actions

You'll notice
Useful3 Signal0
Artifacts

Prototypes now lean on your real connected data and actions instead of faking them, or stay fully static.

What

The prototyping skill prompt now includes a section pushing Claude toward live or connected data and toward acting on the user's behalf, rather than mocking things out, when building prototypes.

Details
  • The section instructs Claude to load the artifact-capabilities skill to check which capabilities the user actually has.
  • If a needed capability is not covered, the guidance is to stay fully static rather than fake it.
  • Gated on the artifact capabilities schema: the section is appended only when the artifact schema exposes a "capabilities" field, otherwise the prompt is unchanged.
Evidence

## When the idea needs real data or real actions

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 v2.1.221 →