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SDK task_started events now include owned_by_subagent so you can tell who owns a task.
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owned_by_subagenttask_started
What
The task_started system event in the SDK stream now includes owned_by_subagent, so consumers can tell tasks a subagent owns apart from tasks the main thread owns. The session runner tracks the owned task ids alongside it.
Evidence
owned_by_subagent
Strings lifted out of the shipped bundle, so the claim above can be checked against them.