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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

Command aliases now count when detecting name collisions

You'll notice
Useful3 Signal0
Slash Commands

Your custom command is now flagged when its name clashes with a builtin command's alias.

What

A user or plugin command whose name matches a builtin command's alias is now detected as a collision instead of quietly shadowing it.

Details
  • Building the set of taken command names adds each command's aliases entries as well as its name.
  • The same alias awareness feeds the new tip filtering check (n.name === e || n.aliases?.includes(e)).
Evidence

for (let g of h.aliases ?? []) s.add(g);

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 →