Background Agent Pings

Trust system reminders as agent progress notifications. Don't poll.

Pattern

When you launch a background agent, continue working on other tasks. The system will notify you via reminders when:

• Agent makes progress: Agent <id> progress: X new tools used, Y new tokens
• Agent writes output file (check the path you specified)

DO

1. Task(run_in_background=true, prompt="... Output to: .claude/cache/agents/<type>/output.md")
2. Continue with next task immediately
3. When system reminder shows agent activity, check if output file exists
4. Read output file only when agent signals completion