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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

Slash commands can announce a default effort level via a notice

You'll notice
Useful2 Signal0
Slash Commands

Slash commands can tell you which effort level they defaulted to when you didn't specify one.

What

Command dispatch gained two optional hooks, onUserTypedArgs for interactive invocations and getDefaultEffort, whose returned .notice is rendered as a notice message when the user did not type an effort explicitly.

Details
  • effort resolution order for a command is now getEffort ?? getDefaultEffort()?.value ?? effort
  • onUserTypedArgs fires only for interactive invocations, not programmatic dispatch
  • the notice is shown only when no explicit effort was typed, so a user-supplied effort stays silent
Evidence

let k = g.getDefaultEffort?.(A, n)?.notice;

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 →