Definition
Human-in-the-loopHITL
A design in which an AI system pauses for a person to approve, edit or reject an action before it takes effect.
Human-in-the-loop design keeps people in control of consequential decisions: sending messages, moving money, changing infrastructure, publishing content. The AI does the preparation; a human makes the call.
It is most reliable when built into the system's control flow, as a real pause in the agent graph or workflow, rather than as an instruction in the prompt. The rejection paths deserve as much testing as the happy path.
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