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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 v2.1.225 7 Aug 2026

Tool renderers can now supply a progress renderer

Under the hood

Useful2 Signal0

Artifacts

Artifact tools can now show live progress lines in the transcript while they work.

What

The tool UI override map for the artifact tool passes renderToolUseProgressMessage alongside renderToolResultMessage.

Details

This is the path by which the publish-retry progress line reaches the transcript.

Evidence

renderToolUseProgressMessage

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

See this entry in the whole of v2.1.225 →