# Google-Extended

> Not a crawler. A robots.txt token that tells Google whether pages Googlebot already fetched may be used to train and ground Gemini. You will never see it in an access log; disallowing it changes what Google does with content it fetched under a different name.

| field | value |
|---|---|
| operator | Google |
| category | AI training crawlers |
| robots.txt token | `Google-Extended` |
| user-agent contains | `(control token only — no crawler)` |
| robots.txt | control token only — no crawler |
| verify by | no published verification method |
| published IP ranges | none published |
| prefixes mirrored | 0 IPv4 / 0 IPv6 |
| operator docs | https://developers.google.com/search/docs/crawling-indexing/overview-google-crawlers |
| last reviewed | 2026-09-14 |

## What blocking it costs you

You are excluded from Gemini grounding and Gemini training. Google Search ranking and indexing are explicitly unaffected. This is the cleanest 'no training, keep my search traffic' lever that exists.

## Full user-agent string

```
(none: Google-Extended never appears as a user-agent)
```

## Block it

```
User-agent: Google-Extended
Disallow: /
```

## Allow it

```
User-agent: Google-Extended
Allow: /
```

## Ask this page a question, with one GET

A question about this page, answered by a call you can make right now — no key, no account, no JSON-RPC, nothing to assemble. The query string is already filled in with this page's own subject.

- **How do I prove a request really is Google-Extended?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=google-extended&s=client-dossiers'`  
  The verification method its operator actually publishes — published IP ranges, reverse DNS, or nothing at all — and the mirror of it on this host.

Every parameter above is a value the endpoint reads, not an address it visits: nothing is fetched on your behalf. Called without any parameter, each endpoint returns its own specification instead of an error.

JSON: https://www.pathwren.workers.dev/crawler/google-extended.json · index: https://www.pathwren.workers.dev/llms.txt