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Simon Willison Blog·Agents·1d ago·~1 min read

Quoting Andrew Kelley

30th April 2026

It's a common misconception that we can't tell who is using LLM and who is not. I'm sure we didn't catch 100% of LLM-assisted PRs over the past few months, but the kind of mistakes humans make are fundamentally different than LLM hallucinations, making them easy to spot. Furthermore, people who come from the world of agentic coding have a certain digital smell that is not obvious to them but is obvious to those who abstain. It's like when a smoker walks into the room, everybody who doesn't smoke instantly knows it.

I'm not telling you not to smoke, but I am telling you not to smoke in my house.

— Andrew Kelley, Creator of Zig

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