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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.229 ·

/prototype now picks a fidelity and can build on an app you already have

/prototype picks a fidelity itself, can build on your existing app, and hands off a scoped brief.

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JSON All of v2.1.229
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SkillsArea: what it touches
ImprovementsKind: in v2.1.229,
What probably matters to youSection of the release
What

The prototype skill names three fidelities, sketch, clickable and wired, defaults to clickable, and states its pick instead of asking you. If you explicitly ask, it can prototype a feature on top of an existing app, either as a screenshot overlay or a shell built from your repo source. A new hand-off step converts the finished prototype into an approved brief split into must-have, nice-to-have and cut.

Evidence

Every prototype is built at one of three fidelities, and naming it sets

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

Read from
Names in the bundle/prototype

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