Sep 4 • General discussion
Designing the Stop, Not Just the Reasoning
I've been seeing a term floating around AI circles this year: "loop engineering." First reaction — another buzzword. So I went and checked where it actually came from before repeating it.
Turns out it's real. Coined by a well-known engineer earlier this year, building on ideas a couple of others were already circling. But here's what surprised me: the underlying idea isn't new at all. Researchers were studying "reason, then act, then check, then decide again" loops back in 2023, and the pattern traces back decades further, into old control-theory and feedback-loop thinking.
So what's actually new? Not the technique. The name gave people a shared way to talk about something that used to get scattered across three separate conversations — prompt design, agent reliability, AI observability. Once there's one name for it, you notice it's really one discipline: how do you design the trigger that starts an agent, the planner that decides its next move, the verifier that checks the output, and — the part everyone skips — the stop-rule that tells it when to quit?
That last one is the piece I've started paying real attention to. I found a case where a company burned through an entire year's AI-tooling budget in about four months, spread across thousands of engineers, before anyone capped individual spend. Nobody meant for that to happen. It's just what a loop does when it keeps running and no one designed an explicit stopping condition.
Here's what I've taken from digging into this: when I build anything agent-like now, I ask the stop-rule question before I ask the reasoning question. Not "how smart can I make this," but "how does it know when to stop, and what happens if it's wrong for a while before anyone notices?" It's a boring question. It's also the one most people skip, and it's usually where the real cost — in money or in mistakes — hides.
Still figuring out where the line is between a good-enough stop-rule and over-engineered guardrails. If you've built agent loops and have a rule of thumb for that, I'd like to hear it.
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Designing the Stop, Not Just the Reasoning
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