# Knowing When to Stop: The Art of Making a Loop Converge

> One of the least glamorous but most important problems in building AI agents is teaching them when to stop. This a16z essay digs into the convergence question: an agent that loops through steps, calling tools and checking its work, has to decide at some point that the task is actually done rather than spinning forever or quitting too soon. The piece frames this as a core design challenge rather than an afterthought. Stop too early and the agent hands back half-finished work; stop too late and you burn time, money, and user patience while it polishes something already good enough. Getting that judgment right is much of what separates a reliable agent from a frustrating demo. It is a useful lens because it reframes agent reliability as a control problem, not just a matter of smarter models. As more real workflows get handed to autonomous systems, knowing when to declare victory turns out to be as hard, and as consequential, as knowing how to do the work in the first place.

_Section: [Interesting AI Articles](https://www.wortins.com/articles) · Source: Andreessen Horowitz · Published Saturday, August 8, 2026_

## Wortins' read

One of the least glamorous but most important problems in building AI agents is teaching them when to stop. This a16z essay digs into the convergence question: an agent that loops through steps, calling tools and checking its work, has to decide at some point that the task is actually done rather than spinning forever or quitting too soon. The piece frames this as a core design challenge rather than an afterthought. Stop too early and the agent hands back half-finished work; stop too late and you burn time, money, and user patience while it polishes something already good enough. Getting that judgment right is much of what separates a reliable agent from a frustrating demo. It is a useful lens because it reframes agent reliability as a control problem, not just a matter of smarter models. As more real workflows get handed to autonomous systems, knowing when to declare victory turns out to be as hard, and as consequential, as knowing how to do the work in the first place.

## Source

[Read the full story at Andreessen Horowitz](https://a16z.com/knowing-when-to-stop-the-art-of-making-a-loop-converge/)

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