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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 v2.1.227

Renderer repaint debugging behind an environment variable

Use it now
Useful2 Signal3
Terminal Rendering Notable not in their notes

Set CLAUDE_CODE_DEBUG_REPAINTS to capture which components trigger terminal redraws.

CLAUDE_CODE_DEBUG_REPAINTS
What

The terminal renderer reads CLAUDE_CODE_DEBUG_REPAINTS and only captures per-component debug ownership information when it is set, so normal sessions skip that work. Layout caches also moved onto the nodes themselves.

Details
  • Root render nodes are now created with an explicit layout engine config.
  • New per-node fields cachedLayout, pendingClears and scrollCommitStartedAt replace a separate side map.
Evidence

CLAUDE_CODE_DEBUG_REPAINTS

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 v2.1.227 →