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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

Bash [[ ]] parser bails out on unbalanced parentheses

Under the hood
Useful2 Signal0
Permissions

Complex bash double-bracket tests now bail out early instead of being misjudged by the permission scanner.

What

The double-bracket regex scanner stops as soon as the parser desyncs rather than continuing and checking only the final depth.

Details
  • If paren depth ever goes negative mid-scan, the scanner returns a too-complex result with differential: !0.
Evidence

[[ ]] regex has unbalanced parentheses (parser desync)

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 →