A legal or content team asks you to block AI training crawlers, and the SEO lead hesitates. If "AI crawler" and "Googlebot" sound like the same thing, blocking one feels like risking search traffic the business depends on. That hesitation leaves plenty of sites either allowing everything out of fear, or blocking everything and quietly losing rankings they never meant to touch.
Google-Extended is a separate crawler token that Google introduced so site owners can control whether their content trains Gemini and Vertex AI generative models, independent of the crawl that powers Google Search. AskEO scans a page's meta tags, JSON-LD schema, headings, and AI crawler permissions, and returns SEO and AEO scores in roughly 30 seconds, and the AI Crawler Access section is exactly where this Google-Extended confusion shows up on real audits.
What Is Google-Extended?
Google-Extended is a robots.txt user-agent token that governs one thing: whether your site's content can be used as training data for Google's generative AI models, including Gemini and the models behind Vertex AI. It does not crawl for Search indexing, and it carries no ranking signal of its own.
Because the name starts with "Google," it gets read as an extension of Googlebot. It is closer to a separate permission slip that happens to share a company name.
Does Blocking Google-Extended Affect Google Search Rankings?
No. Disallowing Google-Extended in robots.txt has no measurable effect on whether your pages get indexed or how they rank in Google Search. That crawl and ranking pipeline runs on Googlebot, which reads its own separate user-agent block.
The confusion usually comes from editing robots.txt with a blanket rule instead of a per-agent one. A line like User-agent: * followed by Disallow: / blocks every crawler that respects robots.txt, Googlebot included. A dedicated User-agent: Google-Extended block with its own Disallow: / leaves Googlebot's rules untouched.
| Crawler token | What it crawls for | Effect of disallowing it |
|---|---|---|
| Googlebot | Google Search indexing and ranking | Pages stop appearing in Google Search results |
| Google-Extended | Training data for Gemini and Vertex AI models | No measurable change to Search indexing or ranking |
How Do You Check Which AI Crawlers Your Site Allows?
Read the live robots.txt file rather than trusting memory of what a developer configured months ago. CMS updates and CDN caching both have a habit of silently reverting custom rules.
- Open yoursite.com/robots.txt directly in a browser.
- Search the file for "User-agent: Google-Extended" and "User-agent: Googlebot" as separate blocks.
- Confirm neither sits under a blanket
User-agent: *rule that would affect both at once. - Check for other AI training tokens, such as GPTBot or CCBot, if you want to control those independently too.
- Re-check the live file after any redeploy, theme change, or CDN cache purge, since these are the moments custom rules get dropped.
Reading one file by eye works for a single site. It stops working once you are responsible for a dozen properties, or auditing a client's site you did not build. At that point a missed rule sits invisible for months, and the first sign is a drop in AI citations nobody can explain. This is the exact gap AskEO's AI Crawler Access check closes: point it at a homepage and it reports which AI crawlers are allowed or blocked without you opening a single robots.txt file by hand. See what an audit covers on the pricing page before running one.
What About Google's AI Overviews and Other AI Training Crawlers?
Google-Extended governs training data, not the live retrieval Search uses to generate AI Overviews, which draws on the same index Googlebot already built. Blocking Google-Extended is unlikely to change whether AI Overviews reference your pages, since that feature sits on top of the existing Search index rather than a separate crawl.
GPTBot, ClaudeBot, and PerplexityBot are different again: each is its own token, controlled by its own robots.txt block, and each maps to a different AI product's ability to read and cite your content. Allowing Google-Extended while blocking GPTBot, for example, is a valid combination, since the two tokens have nothing to do with each other. Treat every AI crawler token as an independent decision rather than one blanket setting, and browse the AEO crawler guides on this blog for the rest of the list worth checking.
Should You Actually Block Google-Extended?
That depends on your organization's stance on content licensing, not on search performance. Blocking it opts your content out of training future Gemini and Vertex AI models. It will not raise or lower your current rankings, and it will not, on its own, change whether your pages get cited in an AI answer today.
You might reason that reading robots.txt by hand is enough, and for one site checked once, it usually is. The problem is repetition: agencies and in-house teams managing several domains need this checked on a schedule, not as a one-time favor, because a CMS update can revert the file without anyone noticing. AskEO's Pro plan includes historical tracking, so a crawler-access regression shows up in your own report history the same day it happens instead of months later.
There is also a practical reason to make the call deliberately rather than by default. Once you decide, document the reasoning next to the robots.txt change itself, in a comment or a linked policy note. Six months later, whoever inherits the file needs to know whether Google-Extended is blocked because of a licensing decision or because someone copied a boilerplate robots.txt from another project without reading it. A rule with no stated reason tends to get reverted by the next engineer who does not recognize the token, and the whole decision has to be made again from scratch.
Frequently Asked Questions
Does blocking Google-Extended remove my pages from Google Search?
No. Google-Extended only controls whether your content can be used to train Gemini and Vertex AI generative models. It has no connection to Googlebot's crawling or indexing, so disallowing it in robots.txt does not remove pages from Google Search or change how they rank.
How is Google-Extended different from Googlebot?
Googlebot is the crawler Google Search uses to discover, index, and rank pages. Google-Extended is a separate token that lets site owners opt content out of training Google's generative AI models without touching Search visibility. Each is controlled by its own robots.txt block.
Can I block Google-Extended but still allow Googlebot?
Yes. Add a dedicated block for User-agent: Google-Extended with Disallow: / while leaving your existing Googlebot rules unchanged. Robots.txt reads each user-agent block independently, so one rule does not override the other as long as neither sits under a blanket wildcard rule.
Does blocking Google-Extended affect AI Overviews citing my site?
Unlikely. AI Overviews draw on the same index Googlebot already builds through normal Search crawling, not on a separate live crawl. Google-Extended governs training data for future models, which is a different pipeline from the retrieval AI Overviews uses today.
Where do I add the Google-Extended rule in robots.txt?
Add a block reading User-agent: Google-Extended followed by Disallow: / on its own lines, separate from any Googlebot or wildcard rules. Keeping it in its own block is what keeps the two crawlers independent, and reloading the live file afterward confirms the syntax saved correctly.
Run a free AskEO audit on your homepage and open the AI Crawler Access section. It reports in roughly 30 seconds whether Google-Extended, Googlebot, and the other AI crawlers are allowed or blocked, so the decision is based on your actual robots.txt instead of a guess. Start a free audit and see your current crawler access before you change anything.