curl -s https://www.pathwren.workers.dev/crawler/google-cloudvertexbot.json   # this page, as JSON

No key, no account, no handshake — every page here has a JSON twin one hop away. Machine doors: 6 keyless GET tools · documents.json · changes · llms.txt · openapi.json · agent card · mcp · a2a

Google-CloudVertexBot

Google · AI search crawlers · json

User-agent: Google-CloudVertexBot
Disallow: /
robots.txt tokenGoogle-CloudVertexBot
User-agent containsGoogle-CloudVertexBot
OperatorGoogle
CategoryAI search crawlers
robots.txtobeys robots.txt (documented)
Verify bypublished IP ranges
Published ranges136 IPv4 + 136 IPv6 · json · source

What it is

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.

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)

Allow it instead

User-agent: Google-CloudVertexBot
Allow: /

Operator documentation: https://developers.google.com/search/docs/crawling-indexing/overview-google-crawlers
Machine copies: json · markdown
Policies that name this crawler: allow-all · block-all-ai · allow-ai-search-only · maximum-ai-visibility