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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

Plan mode prototype-artifact offer

Not switched on
Useful2 Signal4
Plan Mode

Plan mode can offer to build a prototype artifact first, but the offer never appears in this build.

A plan-mode prototype-artifact offer prompt exists but its guard is hardcoded to false.

What

Plan mode can offer to build a prototype artifact before the plan is executed, but the section is never appended in this build.

Details
  • the plan-mode system reminder gains a prototypeOffer: !0 field and a "## Prototype Artifact Option" prompt section
  • the section tells Claude that if the user accepts, the prototype is built after plan mode ends, plan mode stays read-only except for the plan file, the plan file should name the prototype-first approach, and the prototype skill is invoked once plan mode has ended
  • the reminder emits a plan_prototype_offer marker alongside the existing plan_workshop_offer
  • guarded by isPlanPrototypeOfferEnabled, which is Lgo() && !B5(); Lgo returns !1, so the guard is constant false
Evidence

## Prototype Artifact Option

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 →