Stagehand

AI agent instructions

Read the Notte skill and follow its setup instructions when setting up Notte or building browser automation. This is the shared source for CLI setup, authentication, and the browser-to-code workflow.

Stagehand is an open source AI browser automation framework that lets you choose what to write in code and what to write in natural language.

Stagehand v4 does not currently work against Notte cloud browsers. On initialize() it installs a helper extension over CDP, and Notte sessions reject extension management:

CDP operation 'Extensions.loadUnpacked' is not permitted in Notte Cloud sessions.

This affects both the Python and the TypeScript SDK, and there is no client-side flag that skips the extension. Until Notte can preload the helper extension, use Browser Use, Playwright, or a Notte agent instead.

How the connection is meant to work

Stagehand takes a CDP URL through local_browser.connect(), so a Notte session plugs in with session.cdp_url():

notte_stagehand.py

async def main():
    client = NotteClient()

    with client.Session() as session:
        # Stagehand attaches to the Notte browser over CDP
        stagehand = Stagehand(
            browser=await local_browser.connect(cdp_url=session.cdp_url()),
            model="anthropic/claude-sonnet-4-5-20250929",
            api_key=os.environ.get("ANTHROPIC_API_KEY"),
        )
        await stagehand.initialize()
        print(await stagehand.extract("the title of the top story"))
        await stagehand.close()


asyncio.run(main())

The equivalent in TypeScript is localBrowser.connect({ cdpUrl }) from @browserbasehq/stagehand.

Earlier versions of this page showed Stagehand(env="LOCAL", local_browser_launch_options={...}). That API belonged to Stagehand v2 and is not present in any release currently on PyPI - neither stagehand v3/v4 nor stagehand-py.

What to use instead

Browser Use

An LLM driving a Notte browser over CDP, working today

Browser Agents

Hand the whole task to a Notte agent

Connect with Playwright

Write the automation yourself against a Notte session

Fetch

Pull structured data out of a page without an agent

⌘I

Integrations

Coding Agents

Agent Frameworks

Workflow Automation

Browser Drivers

Browser Infrastructure

How the connection is meant to work

What to use instead

Browser Use

Browser Agents

Connect with Playwright

Fetch

​How the connection is meant to work

​What to use instead

Browser Use

Browser Agents

Connect with Playwright

Fetch

How the connection is meant to work

What to use instead