Browsing agent from Browserbase
Stagehand (open-source framework)
In short
Stagehand (open-source framework) is Browserbase's browsing agent. Stagehand has no robots.txt token, so robots.txt cannot address it and the crawl cannot measure a block rate. The operator publishes nothing a site can check. Stagehand has no operator bot documentation, checked 2026-11-04. Identity comes from the hosting browser, not the framework.
- Operator
- Browserbase
- Purpose
- Task agent All task agent rows. A browsing agent that clicks, fills forms and finishes a job for a person.
- User-agent string
- No exact string is published. What the operator or a third party says: Inherits the browser it runs in; signed only when run on Browserbase with Web Bot Auth
- robots.txt token
- None. No robots.txt line can address this agent.
- Respects robots.txt
No documentation
operator publishes no bot documentation (checked 2026-11-04) for Stagehand itself. Source, read 2026-11-04.
- Verification
Nothing published
The operator publishes no list, reverse DNS pattern or key directory a site owner can check. Documentation, read 2026-11-04.
- IP ranges
- Not published.
- Rate behaviour
- Set by the developer.
- Block rate
-
None: the agent has no token, so a robots.txt block rate does not exist.
- Documentation
- Operator publishes no bot documentation (checked 2026-11-04). Closest page read.
Note. Identity comes from the hosting browser, not the framework.
Allow and refuse lines
This agent has no robots.txt token, so there are no lines to copy. Without a token, a published list or a signature, a site owner cannot tell it from an ordinary visitor by request alone.
Refusing or allowing in robots.txt states a preference. For this row the operator or its documentation says robots.txt may not govern the fetch, so enforcement belongs in your WAF.
Browserbase in the Verification Ledger
Key directory; signing is a customer feature. All operators.
- IP lists
- publishes nothing
- Reverse DNS
- publishes nothing
- Key directory
- https://www.browserbase.com/.well-known/http-message-signatures-directory
- Cloudflare
- Cloudflare signed agent (cohort of 2025-08-28)
- Visa TAP registry
- no public operator-level registration found (checked 2026-11-04)
- Mastercard Agent Pay
- no public operator-level registration found (checked 2026-11-04)
Other Browserbase rows
- Browserbase cloud browsers Task agent
Sources
Last reviewed 2026-11-04