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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 phase prompts extracted into a helper

Under the hood
Useful1 Signal0
Plan Mode

Plan mode's prompt text moved into one place with identical wording.

What

The Phase 1 and Phase 2 plan-mode prompt text moved out of the inline prompt builder with no wording change.

Details
  • both the parallel-subagent and the direct-exploration variants now come from a single helper returning phase1 and phase2
  • the strings are byte-identical and there is exactly one caller, so behaviour is unchanged
Evidence

### Phase 1: Initial Understanding

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 →