If you use this pattern, I instantly know you’re using AI:

“It’s not [ thing ], it’s [ other thing ].”

Negative parallelism.

Forget about it. Ban it. Burn it.

Every LLM writes it. Multiple times per response.

Barron’s just counted its use in Fortune 500 filings: 50 in 2023, over 200 in 2025.

4x in 2 years (!!!).

And even the top guys are (over)using it: Microsoft, McKinsey, Cisco, Accenture, all got caught publishing it this month.

The fix is super simple:

You create an anti-ai-writing-style.md. file.

It’s a single file you upload into your Claude Cowork folder.

It also works on every other AI to edit any text. It audits any AI text.

I share my file (to download) at the end of this post (for free, just scroll there).

Here’s how to set it up in 3 minutes:

I prefer Claude Cowork for this. But a ChatGPT Project could work too.

This is how it works:

Claude Cowork works with folders.…