- Subagents only write to their own output file — never to shared state
- Shared state files (status.md, decisions-log.md, task.md) are only written by the main orchestrating agent
- Each Definition-of-Done item in task.md must produce its own independent output file
- When dispatching parallel agents: assign each agent exactly one output file and pass the relevant legacy source paths
- After all subagents complete: the main agent consolidates results into status.md and decisions-log.md