What
One loop that works through the events of a conversation now skips system messages of type per_turn_effort_changed. It handles them the same way it already handled turn_preempted. The old version of this check appears to have had a typo that tested the wrong value, and the new version tests the message itself.
Why
Effort-change events are no longer handled by that loop, and the skip check now looks at the message it is meant to.
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Which part of Claude Code runs this loop, and what a user saw before the change, is not shown.