---
title: Precursor introduces session-based bot detection
description: Precursor brings continuous, session-based behavioral detection to Cloudflare Challenges.
image: https://edgetunnel-b2h.pages.dev/changelog-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://edgetunnel-b2h.pages.dev/changelog/llms.txt  
> Use this file to discover all available pages before exploring further. 

[Skip to content](#%5Ftop) 

# Changelog

New updates and improvements at Cloudflare.

[ Subscribe to RSS ](https://edgetunnel-b2h.pages.dev/changelog/rss/index.xml) [ View RSS feeds ](https://edgetunnel-b2h.pages.dev/fundamentals/new-features/available-rss-feeds/) 

![hero image](https://edgetunnel-b2h.pages.dev/_astro/hero.CVYJHPAd_26AMqX.svg) 

[ ← Back to all posts ](https://edgetunnel-b2h.pages.dev/changelog/) 

## Precursor introduces session-based bot detection

Jul 13, 2026 

[ Challenges ](https://edgetunnel-b2h.pages.dev/cloudflare-challenges/) 

Precursor is rolling out to all customers starting today. Precursor is client-side JavaScript that enables session-based bot detection.

You can [read the announcement blog ↗](https://blog.cloudflare.com/introducing-precursor) for background on why we built Precursor and how session-level behavioral detection works.

With Precursor enabled, Cloudflare can:

* Continuously evaluate behavioral signals across a session
* Re-validate challenge clearance as behavior changes
* Update bot scores with session context
* Provide client-side visibility where none previously existed

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.

![Animated walkthrough of enabling Precursor in the Cloudflare dashboard](https://edgetunnel-b2h.pages.dev/images/precursor/enabling_precursor.gif) 

To learn more, refer to the [Precursor documentation](https://edgetunnel-b2h.pages.dev/cloudflare-challenges/precursor/).

```json
{"@context":"https://schema.org","@type":"BlogPosting","@id":"https://edgetunnel-b2h.pages.dev/changelog/post/2026-07-13-precursor-session-based-detection/#page","headline":"Precursor introduces session-based bot detection · Changelog","description":"Precursor brings continuous, session-based behavioral detection to Cloudflare Challenges.","url":"https://edgetunnel-b2h.pages.dev/changelog/post/2026-07-13-precursor-session-based-detection/","inLanguage":"en","image":"https://edgetunnel-b2h.pages.dev/changelog-preview.png","dateModified":"2026-07-13","datePublished":"2026-07-13","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://edgetunnel-b2h.pages.dev/#website","name":"Cloudflare Docs","url":"https://edgetunnel-b2h.pages.dev/"}}
```