# 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 | 2026-09-01 |

## 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: /
```

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