You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
HooksArea: what it touches
ImprovementsKind: in v2.1.268,
What probably matters to youSection of the release
What
A hook is custom code that runs automatically at certain points in Claude Code, such as before a tool is used. Previously, once a tool call reached its permission prompt (the dialog asking you to approve or deny a tool), a hook could not stop it mid-flight. Now, while that permission prompt is waiting, Claude Code races the tool call against the hook's own decision. If the hook finishes first with an outcome, the tool call is aborted and the hook's decision, including any interrupt, is used instead, with a log message noting which tool and hook caused the interrupt.
Why
This lets hooks reliably cancel a tool call that's sitting at a permission prompt, rather than only being able to act before or after that point.
