What warrants HITL
Payments. Public posts. Email sends. File deletions. Production DB writes. Any action costly to reverse.
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Async flow
Agent emits proposed action + rationale. Sent to reviewer (Slack, email, dashboard). Reviewer approves/denies. Agent resumes.
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Timeout
No response in 24h → default deny. Configurable per action type.
Batching
Group similar actions. Reviewer approves whole batch. Reduces friction for high-volume workflows.