Everything Claude writes

Everything Claude writes is about to carry an invisible watermark. And no, it's not detecting AI writing, it's detecting LAZY AI writing. This viral post right and the facts wrong. Anthropic just signed the EU AI Act's code of Practice on Transparency of AI-Generated Content. And published exactly how Claude will mark AI generated content. Think of it like the security thread in a banknote, you can't see it, but the right machine can. 1️⃣ Invisible watermark woven into the text itself. It doesn't change the meaning or readability, and it travels when you copy paste somewhere else. Second, images get signed metadata under the C2PA standard, an evident label that says "Claude touched this." And because the watermark happens it applies wherever Claude runs: the app, the API, even through Amazon and Google. The EU wrote a rule for Europe. New models will mark AI-generated content from day one. Claude models launched in the EU on or after August 2, 2026 will support machine-readable marking at launch. Generated text will carry embedded watermarks, and generated files will include digitally signed provenance metadata where supported. The entire planet got the feature from August 2nd, 2026. Have it on models are being retrofitted. Now before anyone panics about their essays, read the fine print. Anthropic's own docs says a detected mark is a signal, not proof. Heavy editing, or translation can strip it out. No public detection tool yet. That part is forthcoming. So if you paste raw Claude output or a client deliverable, that text can now testify against you. If you actually rewrite it, the watermark probably dies in the edit. This doesn't detect AI writing, it detects lazy AI writing. That distinction matters a lot. If you want to become the most capable AI person in any room, check out PracticallyAI. Get 1% Better at AI Every Single Day. One 2-minute email, daily: AI stories that matter, actionable tips, a tool worth trying, and a prompt you can steal.