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Browserbase et Stagehand

Tool : A precise action the AI can call · requires browserbase

Hosted Chrome browsers and act, extract, observe SDK for agents.

The most serious browser layer in production; a driven browser is an attack surface.

GitHub · 25,804 ★ Docs

Overall score

6.7 /10

Security: serious reservations

Utility

8.0

Reliability

10.0

Security

Serious reservations

Ease

Technical · Technical

Security reflects where data goes, requested permissions and incidents on record at the verification date. It is not a guarantee of zero risk: check the deployment mode and the connections you enable.

What it does, concretely

Automating web tasks with an AI agent requires a reliable browser that can be controlled remotely and handle complex pages. Browserbase provides cloud-hosted Chrome browsers accessible via an API key, while Stagehand is the SDK that lets an agent drive them using natural language.

In practice, Stagehand exposes three primitives: act() to perform an action on the page (click, fill a form), observe() to identify what is interactive, and extract() to retrieve structured data. These methods rely on a language model of your choice and coexist with standard Playwright APIs for deterministic actions. When a site changes its structure, Stagehand detects the break and automatically refreshes how the action is executed.

The platform targets developers building web agents in TypeScript, Python, or Go who need production-ready browser infrastructure: isolated sessions, support for nested iframes, closed Shadow DOMs, OpenTelemetry observability, and search or page fetching without launching a full browser.

It is not suited for people without development skills, as there is no consumer-facing graphical interface. Furthermore, any agent that navigates, clicks, and fills forms acts on the real web, which requires careful attention to the permissions granted and the sites targeted.

What it offers

·Cloud-hosted Chrome browsers accessible via a single API key for all sessions.
·Three natural language primitives: act() to interact, observe() to analyse, extract() to retrieve structured data.
·Self-healing actions: when a site's structure changes, Stagehand detects the break and automatically updates the selector used.
·Compatibility with standard Playwright APIs for deterministic actions, alongside the AI primitives.
·Native support for out-of-process nested iframes and closed Shadow DOMs, often unsupported by other tools.
·Web search and page retrieval as Markdown via browserbase.search() and browserbase.fetch(), without launching a full browser.
·Built-in OpenTelemetry observability to monitor agent actions in production.
·SDK available in TypeScript, Python, and Go from a single monorepo.

Our tips

Use standard Playwright methods (goto, click, locator) for stable and predictable actions, and reserve act() for situations where the page is too dynamic for a fixed selector.
Pass a precise Zod schema to extract() to get reliable structured data: the more detailed the schema, the fewer interpretation errors the model makes.
Use observe() before act() to inspect what is interactive on the page without triggering any action: this lets you validate the agent's logic before executing it.
To retrieve web content without opening a full browser session, prefer browserbase.fetch() with the Markdown format: it is faster and uses fewer tokens.
Export your API keys (BROWSERBASE_API_KEY, LLM provider key) only via environment variables, never hard-coded in source files.

Watch out

A browser driven by an agent acts on the real web: a misconfiguration can lead to unintended clicks, form submissions, or purchases on live sites.
The total cost depends on both Browserbase billing (per minute) and calls to the chosen LLM provider, which can make budget estimation difficult without prior testing.

In practice

Price: Freemium · from 18 €
Commercial use: Commercial use: yes
Available on: sdk-ts, sdk-python, mcp
Host: browserbase
FR interface: No

Security and data

Rating: Security: serious reservations
Capabilities: readswritesexecutesnetwork
Your data: Data with third parties
Maintenance: Active
Last release: 23 October 2026

Links and repository checked on 25 October 2026 · added on 1 June 2024

How to install Browserbase et Stagehand

1. Create an account at browserbase.com and retrieve your API key from the dashboard. 2. Install the TypeScript SDK: npm install @browserbasehq/stagehand (or the Python/Go equivalent for your environment). 3. Export your keys as environment variables: export BROWSERBASE_API_KEY="..." and your LLM provider key. 4. Copy the quickstart example from docs.stagehand.dev and adapt the LLM model to your provider. 5. Precaution: only give the agent access to the sites and accounts strictly required; test on staging environments before any production use.

npm install @browserbasehq/stagehand

Official documentation ↗

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