Bots - Precursor introduces session-based bot detection

<p>Precursor is rolling out to all customers starting today. Precursor is client-side JavaScript that enables session-based bot detection.</p> <p>You can <a href="https://blog.cloudflare.com/introducing-precursor" target="_blank" rel="noopener">read the announcement blog<span class="external-link"> ↗︎</span></a> for background on why we built Precursor and how session-level behavioral detection works.</p> <p>With Precursor enabled, Cloudflare can:</p> <ul> <li>Continuously evaluate behavioral signals across a session</li> <li>Re-validate challenge clearance as behavior changes</li> <li>Update bot scores with session context</li> <li>Provide client-side visibility where none previously existed</li> </ul> <p>It integrates with existing protections, including Security Rules, and can be enabled directly from the Cloudflare dashboard with configurable modes to balance security and user experience.</p> <img src="https://developers.cloudflare.com/images/precursor/enabling_precursor.gif" alt="Animated walkthrough of enabling Precursor in the Cloudflare dashboard" style="border:1px solid #e5e7eb;border-radius:6px;display:block;margin:16px 0;"/> <p>To learn more, refer to the <a href="https://developers.cloudflare.com/cloudflare-challenges/precursor/">Precursor documentation</a>.</p>