How to block Amazon Bedrock AgentCore Browser
Operated by Amazon. is a cloud-based browser service that runs on AWS infrastructure. It enables AI agents and applications to interact with websites, naviga… Automated Agent Automates browser interactions programmatically without direct human supervision
How it identifies itself
Amazon CloudFront
robots.txt
What the agent asks to be told. It obeys this or it does not — nothing enforces it.
User-agent: Amazon Bedrock AgentCore Browser Disallow: /
nginx
In the server block, then reload.
# In the server block. 403 rather than 444: a closed connection tells the
# operator nothing, and an agent that gets a status code can log it.
if ($http_user_agent ~* "(Amazon Bedrock AgentCore Browser|Amazon-Bedrock-AgentCore-Browser)") {
return 403;
}
Apache
In .htaccess or the vhost.
BrowserMatchNoCase "Amazon Bedrock AgentCore Browser" bad_bot
BrowserMatchNoCase "Amazon-Bedrock-AgentCore-Browser" bad_bot
<RequireAll>
Require all granted
Require not env bad_bot
</RequireAll>
Cloudflare
Security → WAF → Custom rules.
# Security → WAF → Custom rules, action: Block (http.user_agent contains "Amazon Bedrock AgentCore Browser") or (http.user_agent contains "Amazon-Bedrock-AgentCore-Browser")
WordPress
A child theme's functions.php, or a small plugin.
// functions.php of a child theme, or a small plugin. Runs before WordPress
// builds the page, so a blocked agent costs one PHP process and no queries.
add_action('init', function () {
$agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
foreach (['Amazon Bedrock AgentCore Browser', 'Amazon-Bedrock-AgentCore-Browser'] as $needle) {
if (stripos($agent, $needle) !== false) {
status_header(403);
exit('Blocked: Amazon Bedrock AgentCore Browser');
}
}
});
robots.txt is a request. The rules below it are the wall.
Amazon Bedrock AgentCore Browser publishes a token, so the directive above will work for as long as it keeps honouring it — and nothing except its own good manners makes it. The server rules match on a header the requester sets, which stops the agent that says who it is and not the one that copies somebody else's name. Botscope verifies identity against DNS and published address ranges, records which check decided each request, and shows you the ones that lied.