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Agent reference · Agentic browser

GoogleAgent-Mariner (retired)

Retired: Project Mariner shut down on 2026-05-04 and Google-Agent replaced it. Old visits still show under this name.

Vendor
Google
Agent type
Agentic browserBrowse and act for a person: open pages, click, fill in forms, check out.
Can be verified by
Can't be verifiedThe vendor publishes nothing a visit can be checked against. A visitor using this name can be named, never proven.
How sure we are
ProbableCredible secondary sources describe it; the vendor has not documented it.
Last reviewed
Vendor documentation
developers.google.com (opens in a new tab)

Tokens to look for

User-Agent tokens

Appear in the User-Agent header of its requests.

  • GoogleAgent-Mariner

robots.txt tokens

No robots.txt token is documented for it.

Check a visitor claiming to be GoogleAgent-Mariner (retired)

We've filled in its token. Paste the full User-Agent from your logs and the address it came from for a real answer.

Paste the full User-Agent header from your logs. A single token such as GPTBot works too.

Optional

IPv4 or IPv6, as your logs show it. Used only for this check and never stored. Without it, a claim can only come back as can't be verified.

What this means for your site

GoogleAgent-Mariner (retired) acts for a person: it reads, clicks and fills in forms. Whether it can finish a task on your site is the new conversion rate.

See whether AI agents can find your product, use it and, soon, pay for it.

Run the free agent-readiness check