Human-in-the-Loop
A design pattern where a human reviews, approves, or corrects AI decisions at specific points in a workflow — concentrated where judgment matters, not applied uniformly.
Production AI is a system: context, tools, permissions, traces, evals, and feedback loops around the model.
What it is
Human-in-the-loop (HITL) is the practice of designing AI workflows so that humans intervene at chosen points instead of everywhere. The goal is to put human judgment where it actually adds value — high-impact decisions, low-confidence outputs, edge cases the system has not seen — and let the agent handle everything else.
Why it matters
'Review every AI output' is the lazy form of HITL and it collapses under volume. 'No human review' is the dangerous form and it gets caught by an avoidable failure. Good HITL design is the discipline of picking the right inflection points and routing them to a queue that scales.
How it works
Approval gates on high-risk actions; low-confidence escalation when the model signals uncertainty; sampling-based review on auto-resolved cases; correction capture that feeds rejected outputs back into the eval set. The combination produces a system that gets quieter over time as the eval set grows.
Related resources
Approval gates that put a human in the loop where correctness, risk, or accountability actually require human judgment — designed as part of the workflow, not as a panic button bolted on after launch.
A point in an AI workflow where an action is suspended until a human reviews and approves, rejects, or modifies it.
One tidy inbox where every action the AI wants to take — but is not allowed to take alone — waits for a human yes or no, with all the context attached.
When a person fixes something the AI got wrong, that fix is saved and studied — so the same mistake gets engineered out instead of being corrected forever.
Before a workflow change goes live, someone checks not just whether it works, but what new things it could touch — and the changes that could do real damage get an extra set of eyes.