What is a Human-in-the-Loop checkpoint?

A Human-in-the-Loop checkpoint is a deliberate pause in an otherwise autonomous agent workflow where a human must review or approve an action before the agent proceeds.

• Commonly inserted before high-stakes or irreversible actions, like sending an email or executing a financial transaction
• Lets an agent operate autonomously for most of a task while still keeping a person accountable for the riskiest steps
• Can be implemented explicitly as a graph node in frameworks like LangGraph that require approval before continuing

This is a common practical compromise between full autonomy and full manual control, letting an agent handle the routine work while a human retains the final say on consequential actions.

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