Invisible Unicode Attack: Why Tooled AIs Are Vulnerable On your screen, it’s a boring trivia question: “What planet is known as the Red Planet?” Inside the model, that same line contains 96 extra characters your eyes never see, zero‑width spaces and non‑joiners encoding a different answer, or worse, a hidden command. That’s the invisible Unicode attack: the text looks benign to you, but to a tooled-up AI it’s an executable channel.

Invisible Unicode can hide commands in plain prompts. Moltwire's Reverse CAPTCHA shows tooled AIs can be hijacked. Read now. #Moltwire #ReverseCAPTCHA #Unicode