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A workflow where a person reviews, approves, or corrects an agent at key steps instead of letting it run fully autonomously.
Human-in-the-loop is how you use agents in risky work without pretending they are infallible. The agent handles drafting, searching, and repetitive execution, while a human checks decisions with legal, financial, brand, or production impact. Example: an agent prepares a refund response, but a support lead approves it before it is sent.
Plainly
Think of Human-in-the-Loop (HITL) as the lock and rules that keep people and data safe. A workflow where a person reviews, approves, or corrects an agent at key steps instead of letting it run fully autonomously.
In practice
Use it when a workflow touches secrets, permissions, user data, payments, or untrusted input. In practice, define the owner, input, output, and failure mode before you rely on it.