Introducing Precursor: detecting agentic behavior with continuous client-side signals

What this post added

Introduced Precursor, a client-side, session-based verification system that uses dynamically injected JavaScript to continuously collect behavioral signals (e.g., mouse movement, keyboard activity, focus changes, visibility) throughout a user session. This data is processed on the edge to distinguish human traffic from automated or agentic traffic, enhancing bot protection by analyzing behavior over time rather than just at isolated checkpoints. Precursor is designed with privacy in mind, capturing timing and rhythm of keyboard activity but not the keys pressed, and evaluating signals as aggregate patterns. It also introduces session-based views in Security Analytics to explore full visitor journeys.