The AI detector is asking the wrong question

An AI detector answers exactly one question: what is the probability that a machine produced this text. It answers with a guess, the guess is wrong often enough to be famous for it, and it isn't even the question your career depends on.

Start with the guessing. Detection is probabilistic by nature; there's no watermark to find, only statistical texture. Which produces the party trick everyone has seen by now: paste in a centuries-old founding document, or a Bible passage, and watch the verdict come back leaning machine. It's funny with a historical text. It is a great deal less funny when the flagged writer is a student, or a colleague whose careful, even prose happens to resemble the average the model learned. People get accused of outsourcing work they sweated over. That's not a bug at the margin. It's what guessing looks like.

But set the accuracy problem aside, because there's a bigger one. Almost nobody at work runs your memo through a detector. They read it. And the damage, when it lands, is never “a tool assigned this a 92% machine probability.” The damage is a person thinking: this reads like they didn't care. Slop reads as slop no matter who typed it, and plenty of humans were producing it long before the machines industrialized the supply.

So the question that matters is not who wrote it. The question is whether it carries the tells: the stock vocabulary, the throat-clearing openers, the sentences that all run the same length on a treadmill. And here's the useful part: that question doesn't need a probability. The tells are nameable, findable things. A specific word on line four. A stock phrase in the second paragraph. You can point at them.

That's what the Slop Check does instead. It doesn't guess at authorship; it doesn't score your humanity. It runs nine named rules over your draft and flags the exact lines that trip them, in your browser, without your text ever leaving the page. If a flagged line was written by a machine, fix it. If it was written by you at 11pm on a Thursday, also fix it. The reader downstream doesn't care about the provenance. They care about the read.

Stop asking who wrote it. Ask whether it reads like anyone did.