Glossary
What is human in the loop (HITL)?
Human in the loop means a person checks and approves an AI system's work before it takes effect. In marketing and sales, it means nothing goes out in your name, or spends your money, until you have said yes.
Why keep a person in the loop?
An AI assistant can write fast and still be wrong: a claim your product doesn't support, a tone that isn't yours, a person who shouldn't get the email. A yes from someone who knows the product catches those before anyone else sees them.
Does it have to stay that way?
Not for everything. Once a kind of work has gone out many times without a problem, asking every time costs more than it saves. The point is to loosen it on evidence, one channel at a time, and to keep it for the work where a mistake can't be taken back.
How does Propel do it?
Every channel starts at "It drafts, you approve". A channel climbs only on measured results, and anything to a stranger, or that spends money, never runs fully on its own. See Approvals and limits.