Unclear It is not clear how a user enables these mods or when this message would be shown.
What
When development mods are enabled for a session while Claude is in the middle of a turn (a turn is one round of Claude working on your request), Claude Code can now wait for that turn to end instead of acting straight away. A new message says: "This session's mods will load once this turn ends."
The notification about the change only prompts Claude to respond when it is meant to wake the session.
Why
Turning mods on no longer forces Claude to start an extra turn while you are already mid-turn.
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The writer flagged doubt
It is not clear how a user enables these mods or when this message would be shown.