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The TaskCompleted and TeammateIdle hook events can now prevent the session from continuing when they return a blocking response, surfacing messages like "TaskCompleted hook prevented continuation".
Evidence
Hook blocking (search for "TaskCompleted hook prevented continuation", "TeammateIdle hook prevented continuation")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.