Prove you are a robot: CAPTCHAs for agents

Browser Use launched an agent-native authentication mechanism called "reverse-CAPTCHA" — puzzles obfuscated with random capitalization, symbols, and character insertion that AI agents solve in a single pass but humans find nearly impossible. The system samples math problems, obfuscates them, and requires agents to strip the noise and solve before the challenge expires. This represents an innovative approach to signup design in an agent-first ecosystem.