AI Research & Frontier Labs · August 2026

“It's a little bit of a hot take, but I really do think that an agent is an LLM in a for loop with some tools, some memory, and perhaps some guardrails.” — Maarten Grootendorst, The Data Exchange with Ben Lorica

Ben Lorica had asked the definitional question the field keeps stepping around: what actually makes a system an agent? Grootendorst answers by deflating it, noting first that the thing changes every two months. Lorica's immediate reply is that he has just described what people now call the harness.

The Data Exchange with Ben Lorica · 2026-08-20 Listen to the episode → More from Maarten Grootendorst →

Transcript

The Data Exchange with Ben Lorica Around 13:23 into the episode
Maarten Grootendorst

So

Ben Lorica

in your mind, what makes a system agent?

Maarten Grootendorst

Yeah, that's actually been one of the more complex topics for us to actually describe because the field has been changing so quickly. And what is fundamentally an agent when it changes every two months? It's a little bit of a hot take, but I really do think that an agent is an LLM in a for loop with some tools, some memory, and perhaps some guardrails. And that really is essentially it. It all boils down to its base.

Ben Lorica

So you just described the harness, basically. So now people are also the hot term right now is harness engineering.

Maarten Grootendorst

Yeah. Yeah.

Ben Lorica

So where are teams do you think what is the real progress and what is just marketing when it comes to agents?

Speaker names from our own diarization · position estimated from where the line sits in the episode