# Google-CloudVertexBot

> Crawls a site on behalf of a Vertex AI Agent Builder customer who is building an agent over that site. It only visits sites the customer has asked it to.

| field | value |
|---|---|
| operator | Google |
| category | AI search crawlers |
| robots.txt token | `Google-CloudVertexBot` |
| user-agent contains | `Google-CloudVertexBot` |
| robots.txt | obeys robots.txt (documented) |
| verify by | published IP ranges |
| published IP ranges | https://developers.google.com/static/search/apis/ipranges/special-crawlers.json |
| prefixes mirrored | 136 IPv4 / 136 IPv6 |
| operator docs | https://developers.google.com/search/docs/crawling-indexing/overview-google-crawlers |
| last reviewed | 2026-09-14 |

## What blocking it costs you

Third parties can no longer build Vertex AI agents that read your site. Irrelevant to Google Search.

## Full user-agent string

```
Mozilla/5.0 (compatible; Google-CloudVertexBot/1.0; +https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers)
```

## Block it

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

## Allow it

```
User-agent: Google-CloudVertexBot
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-CloudVertexBot?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=google-cloudvertexbot&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.
- **Is 108.177.2.0 really Google-CloudVertexBot?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verify-crawler?ip=108.177.2.0&ua=Google-CloudVertexBot&s=client-dossiers'`  
  That address checked against every prefix this host mirrors. 108.177.2.0 is the first address of 108.177.2.0/27, one of the ranges listed on this page — so the link is a worked example that returns a match. Swap in an address from your own log.

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-cloudvertexbot.json · index: https://www.pathwren.workers.dev/llms.txt