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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

Plan mode artifacts-first field is present but inert

Not switched on
Useful2 Signal4
Plan Mode Notable

Plan mode has an artifacts-first switch wired up, but nothing in this build ever turns it on.

The artifactsFirst plan-reminder field has full reentry and telemetry handling, but its supplying helper returns nothing so the branch never runs.

What

Plan mode reminder attachments carry a new artifactsFirst field with full reentry, refresh and telemetry handling, but nothing in this build ever sets it.

Details
  • A change in the value forces a full rather than sparse plan_mode reminder, and a new predicate detects whether a prior attachment carried it.
  • A plan_artifacts_first_active telemetry event fires when the value is set but no attachment has carried it yet.
  • The helper that would supply the value declares its locals and returns them unassigned, so artifactsFirst is always undefined and the branch never activates. The gate that would set it appears to have been folded out at build time.
Evidence

plan_artifacts_first_active

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 v2.1.223 →