CloudflareBrowserRun is an AI agent in the AI assistants and agents category, operated by Cloudflare.
Renders web pages in headless browsers for Cloudflare customers. Used for browser automation (screenshots, PDF generation, content extraction, etc.) and for AI agents to interact with the web. Used by Cloudflare customers via Workers bindings and REST API. Does not include the /crawl endpoint, which has a separate bot identity (Cloudflare Crawler - Signed Agent).
AI assistants fetch pages on demand when a user asks a chatbot or an agent to read, summarise or act on a URL. Each request is tied to a person, but the visit carries no ad impressions or analytics. Decide per agent whether the value is worth the load.
Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.
We have not confirmed whether CloudflareBrowserRun follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.
User-agent: CloudflareBrowserRun Disallow: /
User-agent: CloudflareBrowserRun Disallow: /private/ Disallow: /search
User-agent: CloudflareBrowserRun Allow: /blog/ Disallow: /
User-agent: CloudflareBrowserRun Allow: / User-agent: * Disallow: /
User-agent: CloudflareBrowserRun group, CloudflareBrowserRun ignores your User-agent: * rules, so repeat any that should still apply.CloudflareBrowserRun from CloudflareBrowserRun's user agent; check Cloudflare's own documentation if it publishes a different robots.txt name.Treat robots.txt as a statement of your policy, and enforce it where requests arrive.
CloudflareBrowserRun reads pages for a person who asked an AI about them. The visit carries no ad impressions, so exclude it from ad requests and decide whether it may read paywalled content.
Transfon Security for publishersAgent visits can click through landing pages and fill in forms. Exclude CloudflareBrowserRun from conversions so campaign optimisation is based on people.
Transfon Security for advertisersAgents like CloudflareBrowserRun can compare prices and may soon place orders. Decide whether agents may reach checkout, and verify them before they do.
Transfon Security for e-commerceCloudflareBrowserRun can sign up, log in and call endpoints on a user's behalf. Rate limit it on sign-up and API routes, where fake trials and abuse start.
Transfon Security for SaaS and APIsrobots.txt is a request, not an enforcement. Transfon Security shows CloudflareBrowserRun by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.
Transfon Security
CloudflareBrowserRun is an AI agent in the AI assistants and agents category, operated by Cloudflare. Renders web pages in headless browsers for Cloudflare customers. Used for browser automation (screenshots, PDF generation, content extraction, etc.) and for AI agents to interact with the web. Used by Cloudflare customers via Workers bindings and REST API. Does not include the /crawl endpoint, which has a separate bot identity (Cloudflare Crawler - Signed Agent).
We have not confirmed whether CloudflareBrowserRun follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.
Add "User-agent: CloudflareBrowserRun" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "CloudflareBrowserRun" at your WAF. In Transfon Security that is one User Agent block rule.
No. robots.txt is voluntary, so CloudflareBrowserRun may not follow it, and anyone can send CloudflareBrowserRun's user agent, so a fake CloudflareBrowserRun ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.
AI assistants fetch pages on demand when a user asks a chatbot or an agent to read, summarise or act on a URL. Each request is tied to a person, but the visit carries no ad impressions or analytics. Decide per agent whether the value is worth the load.
Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.
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