How agents hand off to humans — confidence thresholds, approval flows, and the feedback loop from every escalation back into the agent.
No defined escalation; agents either over-act or stall — humans can't intervene cleanly.
Escalation exists but is binary (handoff or not) and doesn't capture the reason or fix.
Tiered escalation with confidence thresholds and a feedback loop into prompt / data updates.
Closed-loop human review where every escalation tightens future agent performance.