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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 v2.1.228

Lookalike skill names can no longer shadow each other

You'll notice
Useful3 Signal3
Skills

Skills with visually identical names can no longer sneak past collision checks.

What

Skill and command name collisions are compared after normalizing confusable characters, so a synced skill with a visually identical name can no longer slip past the check that drops it in favour of a local skill of the same name.

Details
  • Names are put through NFKC, then separators, control characters, format characters, default-ignorable code points and the braille blank U+2800 are stripped.
  • All dash punctuation and the minus sign fold to -; five colon lookalikes (U+A789, U+2236, U+0589, U+05C3, U+02D0) fold to :.
  • Case folding is applied last.
Evidence

/[\ua789\u2236\u0589\u05c3\u02d0]/g

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

See this entry in the whole of v2.1.228 →