Introducing Precursor: detecting agentic behavior with continuous client-side signals
Jul 13, 2026Marina Elmore, Benedikt Wolters
Summary
Introduced Precursor, a new client-side, session-based verification system for bot detection. Precursor injects a lightweight JavaScript bundle to collect behavioral signals (pointer movement, keyboard activity, focus changes, visibility) throughout a user session. These signals are processed on the edge to build a session-level view of activity, feeding into Cloudflare's bot protection systems and improving bot score accuracy. New session-based analytics are available in Security Analytics to visualize full visitor journeys.
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