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Security
Cloudflare Blog·22d ago·5 min read
Introducing Precursor: detecting agentic behavior with continuous client-side signals
✦ Why It Matters
Implement Precursor to improve your application's ability to distinguish between human users and bots in real time.
Key Takeaways
- Implement Precursor to capture user behavior across entire sessions.
- Use session-based analytics to identify unusual patterns in user interactions.
- Combine Precursor with Turnstile for comprehensive bot protection.
- Monitor the impact of Precursor on user experience and bot activity.
How It Works
Precursor injects a lightweight JavaScript script into web pages to collect interaction data, such as mouse movements and keyboard activity. This data is sent to Cloudflare's servers for real-time analysis, where it is evaluated for patterns that distinguish human behavior from automated actions.
The system accumulates data throughout a session, making it difficult for bots to reset their behavioral signatures.