Track multi-agent mode in world state - #34845
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## Why Multi-agent mode instructions are durable model context and need to survive history changes without re-emitting unrelated setup hints. ## What changed - Add a `multi_agent_mode` world-state section that diffs, retains, and restores the effective mode instructions. - Persist mode changes in world-state snapshots while keeping the legacy `TurnContextItem.multi_agent_mode` field for reading older rollouts. - Keep initial mode instructions after the root-agent usage hint so the active mode takes precedence, and bound custom mode text before snapshotting it. ## Testing - Add snapshot coverage for mode transitions, retained history, and custom-text truncation. - Verify live mode changes preserve instruction ordering, avoid duplicating the usage hint, and record both modes in world state. GitOrigin-RevId: 96b9964d6e5299b07a011c559b68e3d948a49226
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Track multi-agent mode in world state
Why
Multi-agent mode instructions are durable model context and need to survive
history changes without re-emitting unrelated setup hints.
What changed
multi_agent_modeworld-state section that diffs, retains, and restoresthe effective mode instructions.
TurnContextItem.multi_agent_modefield for reading older rollouts.mode takes precedence, and bound custom mode text before snapshotting it.
Testing
truncation.
usage hint, and record both modes in world state.