stagehand-claude-sdk

Give Claude a browser through the Anthropic SDK. StagehandBrowser implements Anthropic's browser toolset (browser_toolset_20260801) on top of Stagehand: all 31 members (navigation, screenshots, clicks and keyboard, page reading, forms, tabs, uploads, console and network), against a local Chrome, a Chromium you already run, or a Browserbase session. The Anthropic SDK runs the model's tool loop; this package runs the browser.

Quickstarts for TypeScript and Python, with local Chrome and Browserbase variants: browserbase/claude-cua-toolset.

Install

pip install stagehand-claude-sdk

Python 3.11 or later. The distribution is stagehand-claude-sdk; the import is stagehand_claude_sdk. It depends on an anthropic release that ships the browser toolset helpers. The Stagehand runtime this driver needs is bundled in the package (Stagehand 4.2.0a2), so there is nothing else to install. Local browsers must be Chromium-based (Chrome, Chromium, Edge).

Quick start

The driver is async, so it pairs with AsyncAnthropic.

import asyncio

from anthropic import AsyncAnthropic
from stagehand_claude_sdk import StagehandBrowser


async def main() -> None:
    browser = await StagehandBrowser.launch(headless=True, allowed_domains=["example.com", "iana.org"])
    async with browser:  # closes the browser when the block exits; the tool runner never does
        runner = AsyncAnthropic().beta.messages.tool_runner(
            model="claude-sonnet-5-5",
            max_tokens=1024,
            tools=[browser],  # the toolset instance is the tools[] entry
            messages=[{"role": "user", "content": "Open example.com and tell me the page heading."}],
        )
        async for message in runner:
            print(message)


asyncio.run(main())

Other browsers:

await StagehandBrowser.browserbase(api_key=os.environ["BROWSERBASE_API_KEY"], allowed_domains=[...])  # a Browserbase session
await StagehandBrowser.connect(cdp_url="ws://127.0.0.1:9222/devtools/browser/...", allowed_domains=[...])  # a running Chromium

Without the runner, await browser.tool_result(tool_use) answers one browser tool_use block.

Options

The SDK's own toolset options pass through: configs, confirm, url_policy, file_policy, tool_configs. javascript_exec, file_upload, read_console and read_network are off unless enabled in configs, and javascript_exec / file_upload need a confirm callback.

Limitations

• Domain lists cover the browser's HTTP(S) requests and WebSocket handshakes, but they are not complete network isolation. Run untrusted tasks in an isolated browser and treat page content as untrusted.
• Local browsers must be Chromium-based. Firefox and WebKit are not supported.
• Downloads are not available in Browserbase sessions.
• If the browser connection is lost, close the toolset and create a new instance.

Examples

See browserbase/claude-cua-toolset for runnable examples.

License

MIT. Includes Stagehand (MIT, Browserbase) under stagehand_claude_sdk/_vendor/stagehand.