Unclear It is unclear how a hook supplies this value and whether it overrides the other effort settings.
What
Effort is how much reasoning the model puts into a reply. Claude Code works out the effort level from the model, the set effort, the current turn's effort and any effort carried over. It now also takes in an effort value that comes from a hook. A hook is a script you configure that Claude Code runs at certain moments.
Why
This means hooks may be able to steer how hard Claude thinks.
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The writer flagged doubt
It is unclear how a hook supplies this value and whether it overrides the other effort settings.