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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

CLI argument rewriting handles values that start with a dash

You'll notice
Useful3 Signal0
CLI Arguments

Flag values starting with a dash are no longer mangled into a separate flag.

What

Rewriting a flag's value no longer mangles values beginning with "-", which were previously parsed as a second flag.

Details
  • a replacement value starting with "-" is written as a single --flag=value token
  • the following argv slot is nulled out rather than left as a separate token
Evidence

if (n.startsWith("-"))

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 →