The background-agent worker manager can now retire a worker purely because its CLI version is stale (this.isVersionStale), even when the worker isn't idle, as long as it isn't running session_cron, isn't a routine, has no in-flight tasks or queue, and its last update predates a threshold (BMe). The tengu_bg_retired telemetry event gains a cause field with values including abandoned-stale, settled, idle-prompt, and empty-idle, plus a worker_cli_version field.
Background worker retirement gains version-staleness path with new causes
A background worker can now be retired purely for running a stale CLI version, with new retirement causes recorded.
Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.257,
Internal ChangesSection of the release