Precursor

Cloudflare has launched Precursor, a client-side verification system that continuously monitors user behavior throughout an entire web session to distinguish humans from bots and automated agents. By analyzing behavioral signals like mouse movements and interaction patterns across full user journeys rather than just at individual checkpoints, Precursor improves bot detection accuracy while reducing friction for legitimate users. The system makes it significantly more difficult and expensive for attackers to operate automation at scale, as they must now replicate consistent human behavior over extended periods.