Claude gonna start snitching on Tuesday.

Anthropic just emailed customers. Starting Nov 3, text carries an invisible watermark.

You can't see it. It survives copy and paste, and it can survive some editing.

Only regulators, journalists, fact-checkers and researchers can check for it right now.

It doesn't say who you are. It says Claude touched the words. Even a quick proofread counts.

If your brand voice runs on Claude, write like someone might check. Because now someone can.