The invoke-target-agent call this progress belongs to.
Human-readable progress message.
OptionalPercentageOptional completion percentage (0–100) when the server can estimate it.
The delegation phase: prompt_execution | action_execution | subagent_execution | decision_processing.
A delegated-run progress update surfaced to the UI, emitted on RealtimeSessionService.DelegationProgress$. These originate server-side during an
invoke-target-agentdelegation (e.g. while Sage works) and let a future overlay render a "working" card while the realtime model narrates the same progress aloud.