You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.228,
ImprovementsSection of the release
What
In the JSON event stream written to stdout for external observers, user and assistant events produced by a subagent are now marked as such. The supervisor that tracks turn boundaries skips marked events, so a subagent talking no longer opens a follow-up turn or resets idle and activity tracking.
Details
The marker is applied to events that carry a parent tool-use id, meaning they came from a tool-spawned subagent rather than the main conversation.
Both the code that adds the marker and the guard that ignores it are new.
Evidence
from_subagent
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
