Intel / blog

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

Source: blog.cloudflare.com
Author: Cloudflare
Date: Published Jul 13, 2026

Why it matters

If you're building or operating browser-automation agents, this signals that simple checkpoint evasion (solving a CAPTCHA once) is no longer sufficient—Cloudflare now scores entire sessions on continuous behavioral signals like mouse curvature and timing, which builders will need to account for when designing more human-like interaction patterns or when deciding which sites are safe to automate.

Terms in this piece · Glossary

AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

Key quotes

“At the network level, we analyze over 1 trillion requests per day to understand reputation, patterns, and anomalies across more than 20% of the web.”

“Today, Turnstile runs nearly 3 billion times per day on some of the most sensitive endpoints on the Internet, helping verify users at key moments like login, signup, and checkout.”

“What remains difficult to replicate is consistent human behavior over time.”

“Session scoping is important because it means a bot cannot reset its behavioral signature by refreshing the page or starting over with a new challenge.”

Read the source blog.cloudflare.com