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GoogleAgent-Mariner
GoogleAgent-Mariner is a Google AI agent token associated with browser-style task execution. This record has no current Google source, so treat a matching request as unverified.
Reads a page when someone asks Gemini about it.
- Google-ExtendedTrainingNot checked
- GooglebotSearchNot checked
- Google-AgentUser fetchNot checked
- Google-GeminiNotebookUser fetchNot checked
- GoogleAgent-MarinerUser fetchNot checked
Reads your live robots.txt and applies the same rules these crawlers use. Nothing is stored.
- robots.txt token
GoogleAgent-Mariner- Follows robots.txt
- Not documented
- How to verify it
- Not published
- Seen on
- Not measured
- Last checked
- 11 June 2026
Should you block GoogleAgent-Mariner?
There is little to gain. Google does not document GoogleAgent-Mariner, so a rule naming it controls none of its documented crawlers. Write rules for Google-Extended, Googlebot, Google-Agent, Google-GeminiNotebook, Google-CloudVertexBot, GoogleOther, GoogleOther-Image and GoogleOther-Video instead.
| Google bot | Job | If you block it |
|---|---|---|
| Google-Extended | Control token | Disallowing it limits future Gemini training and grounding uses covered by the token. Google says it does not affect Search inclusion or ranking. |
| Googlebot | Search | Blocking Googlebot can remove pages from Google Search and eligibility for Google AI features that depend on Search indexing. |
| Google-Agent | User fetch | Blocking it can prevent a Google agent from retrieving a page while completing a user-directed task. It is separate from Google Search crawling. |
| Google-GeminiNotebook | User fetch | A hit usually means a person added your page as a source, not that Google is crawling your site broadly. |
| GoogleAgent-MarinerThis page | User fetch | A hit can indicate agentic navigation rather than indexing; policy should be based on whether you allow AI agents to use the site. |
| Google-CloudVertexBot | Other | A hit usually relates to a configured Vertex AI workflow rather than broad public search crawling. |
| GoogleOther | Other | Blocking it may affect Google product-specific crawling but is separate from primary Search indexing policy. |
| GoogleOther-Image | Other | Blocking it can limit image-oriented Google product crawls without targeting regular Googlebot directly. |
| GoogleOther-Video | Other | Blocking it can limit video-oriented Google product crawls without targeting regular Googlebot directly. |
About robots.txtGoogle has not documented whether GoogleAgent-Mariner follows robots.txt, so a rule is a request, not a guarantee.
User-agent: GoogleAgent-Mariner
Disallow: /Asks GoogleAgent-Mariner not to crawl any page. Other Google bots are unaffected. Add it to the robots.txt file at the root of your site, above any wider rules.
GoogleAgent-Mariner access decides whether Google can fetch your pages. Whether those pages get used in generated answers is a separate question, so track your presence in Google's AI results rather than treating crawl volume as visibility.
Spot it in your logs.
Match the name, then check where the request came from. Anyone can copy a user-agent.
GoogleAgent-MarinerThis string comes from a public crawler registry or observed naming, not current operator documentation.
- 1
Match the name
Search your server or CDN log for
GoogleAgent-Mariner, case-insensitive. A match is a clue, not proof. - 2
Check the source
Google publishes no IP ranges, reverse DNS or signatures for GoogleAgent-Mariner in the sources here, so it cannot be verified. Treat matches as unconfirmed.
Serve the content in HTML
The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.
Questions, answered.
GoogleAgent-Mariner is a Google AI agent token associated with browser-style task execution. This record has no current Google source, so treat a matching request as unverified.
Sources.
Reported, not operator verified. Operator facts and Trakkr’s measurements keep separate dates.
- [1]Reported crawler reference
Reported, not operator verified · checked 11 June 2026
github.com/ai-robots-txt/ai.robots.txt/blob/main/table-of-bot-metrics.md
Last source check 11 June 2026.
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See which AI crawlers read your site.
Trakkr shows which bots, GoogleAgent-Mariner included, visit which pages each day, and whether the answers they feed mention you.
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