GoogleAgent-Mariner
Google •
Since 2025
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What is GoogleAgent-Mariner?
GoogleAgent-Mariner is the user agent for Google's Project Mariner, an agentic AI browser that operates on cloud-based virtual machines on behalf of Google AI Ultra subscribers. The agent can autonomously browse the web, interact with pages, and complete multi-step tasks requested by users. It identifies itself distinctly from other Google crawlers to allow website owners to control agent access separately from search indexing. The bot respects robots.txt directives and standard web protocols.
User Agent String
GoogleAgent-Mariner
How to Control GoogleAgent-Mariner
Block Completely
To prevent GoogleAgent-Mariner from accessing your entire website, add this to your robots.txt file:
# Block GoogleAgent-Mariner
User-agent: GoogleAgent-Mariner
Disallow: /
Block Specific Directories
To restrict access to certain parts of your site while allowing others:
User-agent: GoogleAgent-Mariner
Disallow: /admin/
Disallow: /private/
Disallow: /wp-admin/
Allow: /public/
Set Crawl Delay
To slow down the crawl rate (note: not all bots respect this directive):
User-agent: GoogleAgent-Mariner
Crawl-delay: 10
How to Verify GoogleAgent-Mariner
Verification Method:
Verify requests originate from Google Cloud IP ranges
Verify requests originate from Google Cloud IP ranges
Learn more in the official documentation.
⚠️ AI Training Notice
This bot may collect and use your website content for AI model training. Consider whether you want your content used for this purpose before allowing access.
This bot may collect and use your website content for AI model training. Consider whether you want your content used for this purpose before allowing access.
Detection Patterns
Multiple ways to detect GoogleAgent-Mariner in your application:
Basic Pattern
/GoogleAgent\-Mariner/iStrict Pattern
/^GoogleAgent\-Mariner$/Flexible Pattern
/GoogleAgent\-Mariner[\s\/]?[\d\.]*?/iVendor Match
/.*Google.*GoogleAgent\-Mariner/iImplementation Examples
// PHP Detection for GoogleAgent-Mariner
function detect_googleagent_mariner() {
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$pattern = '/GoogleAgent\\-Mariner/i';
if (preg_match($pattern, $user_agent)) {
// Log the detection
error_log('GoogleAgent-Mariner detected from IP: ' . $_SERVER['REMOTE_ADDR']);
// Set cache headers
header('Cache-Control: public, max-age=3600');
header('X-Robots-Tag: noarchive');
// Optional: Serve cached version
if (file_exists('cache/' . md5($_SERVER['REQUEST_URI']) . '.html')) {
readfile('cache/' . md5($_SERVER['REQUEST_URI']) . '.html');
exit;
}
return true;
}
return false;
}
# Python/Flask Detection for GoogleAgent-Mariner
import re
from flask import request, make_responsedef detect_googleagent_mariner():
user_agent = request.headers.get('User-Agent', '')
pattern = r'GoogleAgent-Mariner'
if re.search(pattern, user_agent, re.IGNORECASE):
# Create response with caching
response = make_response()
response.headers['Cache-Control'] = 'public, max-age=3600'
response.headers['X-Robots-Tag'] = 'noarchive'
return True
return False# Django Middleware
class GoogleAgentMarinerMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
if self.detect_bot(request):
# Handle bot traffic
pass
return self.get_response(request)
// JavaScript/Node.js Detection for GoogleAgent-Mariner
const express = require('express');
const app = express();// Middleware to detect GoogleAgent-Mariner
function detectGoogleAgentMariner(req, res, next) {
const userAgent = req.headers['user-agent'] || '';
const pattern = /GoogleAgent-Mariner/i;
if (pattern.test(userAgent)) {
// Log bot detection
console.log('GoogleAgent-Mariner detected from IP:', req.ip);
// Set cache headers
res.set({
'Cache-Control': 'public, max-age=3600',
'X-Robots-Tag': 'noarchive'
});
// Mark request as bot
req.isBot = true;
req.botName = 'GoogleAgent-Mariner';
}
next();
}app.use(detectGoogleAgentMariner);
# Apache .htaccess rules for GoogleAgent-Mariner# Block completely
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} GoogleAgent\-Mariner [NC]
RewriteRule .* - [F,L]# Or redirect to a static version
RewriteCond %{HTTP_USER_AGENT} GoogleAgent\-Mariner [NC]
RewriteCond %{REQUEST_URI} !^/static/
RewriteRule ^(.*)$ /static/$1 [L]# Or set environment variable for PHP
SetEnvIfNoCase User-Agent "GoogleAgent\-Mariner" is_bot=1# Add cache headers for this bot
<If "%{HTTP_USER_AGENT} =~ /GoogleAgent\-Mariner/i">
Header set Cache-Control "public, max-age=3600"
Header set X-Robots-Tag "noarchive"
</If>
# Nginx configuration for GoogleAgent-Mariner# Map user agent to variable
map $http_user_agent $is_googleagent_mariner {
default 0;
~*GoogleAgent\-Mariner 1;
}server {
# Block the bot completely
if ($is_googleagent_mariner) {
return 403;
}
# Or serve cached content
location / {
if ($is_googleagent_mariner) {
root /var/www/cached;
try_files $uri $uri.html $uri/index.html @backend;
}
try_files $uri @backend;
}
# Add headers for bot requests
location @backend {
if ($is_googleagent_mariner) {
add_header Cache-Control "public, max-age=3600";
add_header X-Robots-Tag "noarchive";
}
proxy_pass http://backend;
}
}
Should You Block This Bot?
Recommendations based on your website type:
| Site Type | Recommendation | Reasoning |
|---|---|---|
| E-commerce | Limit Access | Protect pricing and inventory data from AI training |
| Blog/News | Consider Blocking | Your content may be used for AI training without compensation |
| SaaS Application | Block | No benefit for application interfaces; preserve resources |
| Documentation | Selective | Allow for public docs, block for internal docs |
| Corporate Site | Limit | Allow for public pages, block sensitive areas like intranets |
Advanced robots.txt Configurations
E-commerce Site Configuration
User-agent: GoogleAgent-Mariner
Crawl-delay: 5
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Disallow: /api/
Disallow: /*?sort=
Disallow: /*?filter=
Disallow: /*&page=
Allow: /products/
Allow: /categories/
Sitemap: https://example.com/sitemap.xml
Publishing/Blog Configuration
User-agent: GoogleAgent-Mariner
# Blocking AI training bot
Disallow: /
SaaS/Application Configuration
User-agent: GoogleAgent-Mariner
Disallow: /app/
Disallow: /api/
Disallow: /dashboard/
Disallow: /settings/
Allow: /
Allow: /pricing/
Allow: /features/
Allow: /docs/
Quick Reference
User Agent Match
GoogleAgent-MarinerRobots.txt Name
GoogleAgent-MarinerCategory
aiRespects robots.txt
Yes
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