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Directory Agent frameworks

Browserbase / Stagehand Agent

Acts for a person, operated by browserbase. Libraries developers build agents with.

Operator
browserbase
Kind
Agent frameworks
Does
Acts for a person
Traffic
Many customers’
robots.txt
No token
View as MarkdownOperator docs

Identity

Signs its requests (Web Bot Auth)

  1. SignedSigns every request (Web Bot Auth): cryptographic proof.
  2. IP listPublishes the IP addresses it comes from.
  3. Reverse DNSIts IP addresses resolve to the operator’s domain.
  4. User agentNames itself in its user agent, which anyone can copy.
  5. HiddenLooks like a person’s browser: detected by behaviour.

How to recognise it

  • Signed requests

    Web Bot Auth, with Signature-Agent from browserbase.com. Keys: browserbase.com/.well-known/http-message-signatures-directory

  • User agent

    Contains Browserbase. Anyone can copy it, so it names the client without proving it.

  • Page markers

    Leaves #__v3_cursor_overlay__ in the page while it works.

  • JavaScript globals

    Leaves automation traces in the page’s JavaScript globals.

Details

ID
browserbase.stagehand
Category
Agent
Operator
browserbase
Agent Card
Not published: this agent doesn’t identify itself with an Agent Card.
First seen
2026-09-28

Registrations

Reputation

Computed 2026-11-13

—No score yet
Confidence8%

A score shows from 30%

  • Identity40% of the score19 / 100

    0 verified sources

    A verified Agent Card adds 25 points, 40 if it is signed.

  • Reviews35% of the score–

    No reviews yet

    From the ERC-8004 reputation registry, weighted by who wrote them.

  • Observed25% of the score–

    Not enough sightings yet

    Counts once it is seen on 10 or more Double Agent sites.

Change history

No card history: this agent doesn’t publish an Agent Card.

With Double Agent

Sessions from Browserbase / Stagehand are labelled agent with agent_id: browserbase.stagehand, and tagged in your analytics. Nothing is blocked unless you choose to.

Install Double Agent

Related

All 226 clients

Source: https://github.com/browserbase/stagehand · Operator docs: https://docs.browserbase.com/platform/identity