https://x.com/swyx/status/1975335082048246159 says:

How does OpenAI define an “agent”? An AI agent is a system that can do work independently on behalf of the user.

Your blog article at https://simonwillison.net/2025/Oct/6/work-independently/ quotes that as:

How does OpenAl define an "agent"? An Al agent is a system that can do work independently on behalf of the user.

Spot the differnce?

Different quote symbols, but also Al (with an l for lower) vs. AI (with an I for Intelligence), twice.

I'm not suggesting you bother correcting this. I'm just curious to find out whether you decided to type it out rather than copy-paste and so intoduced a typographic error (plain human error), or whether you sought the assistance of an LLM or other AI-based software tool somehow and it introduced this and you failed to notice (LLM-facilitated human error)!