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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

Terminal text sanitizer rewritten around grapheme width checks

You'll notice
Useful4 Signal0
Terminal Rendering

Weird characters in output and command previews can no longer break your terminal layout.

What

Text rendered into the terminal is now checked cluster by cluster so odd characters cannot corrupt the display.

Details
  • Variation selectors are stripped; bidi, format and non-printing code points are replaced with U+FFFD.
  • Each grapheme's rendered width is validated against the running total, and mismatched clusters are replaced.
  • A per-line budget truncates with … [+N graphemes].
  • Bash command previews and quoted snippets now run through the sanitizer.
Evidence

graphemes]

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 →