What probably matters to youSection of the release
What
Hooks (custom scripts that run at points in Claude Code's workflow) can now directly set the reasoning effort used for a turn. When a hook supplies an effort value that's different from what was last sent, it now takes priority over the normal process of resolving effort from pinned launch settings, per-turn settings, or the model's default.
Why
This gives hooks a direct way to control how much reasoning effort Claude applies to a given turn, without having to go through the usual settings layers.
