Raw CDP & Python Session Reference

The CLI commands handle most browser interactions. Use browser-use python with raw CDP when you need browser-level control the CLI doesn't expose — activating a tab so the user sees it, intercepting network requests, emulating devices, or working with Chrome target IDs directly.

How the Python session works

browser-use python "statement" executes one Python statement per call. Variables persist across calls — set a value in one call, use it in the next.

A browser object is pre-injected with sync wrappers for common operations (browser.goto(), browser.click(), etc.). For anything beyond those, two internals give you full access:

• browser._run(coroutine) — run any async coroutine synchronously (60s timeout)
• browser._session — the raw BrowserSession with full CDP client access

Getting a CDP client

browser-use python "cdp = browser._run(browser._session.get_or_create_cdp_session())"

After this, cdp persists across calls. Use cdp.cdp_client.send.<Domain>.<method>() for any CDP command and cdp.session_id for the session parameter.

Recipes

Activate a tab (make it visible to the user)

The CLI's tab switch only changes the agent's internal focus — Chrome's visible tab doesn't change. To actually show the user a specific tab:

# Get all targets to find the target ID
browser-use python "targets = browser._session.session_manager.get_all_page_targets()"
browser-use python "print([(i, t.url) for i, t in enumerate(targets)])"

# Activate target at index 1 so the user sees it
browser-use python "cdp = browser._run(browser._session.get_or_create_cdp_session(target_id=None, focus=False))"
browser-use python "browser._run(cdp.cdp_client.send.Target.activateTarget(params={'targetId': targets[1].target_id}))"

List all tabs with target IDs

browser-use python "targets = browser._session.session_manager.get_all_page_targets()"
browser-use python "
for i, t in enumerate(targets):
    print(f'{i}: {t.target_id[:12]}... {t.url}')
"

Run JavaScript and get the result

browser-use python "cdp = browser._run(browser._session.get_or_create_cdp_session())"
browser-use python "result = browser._run(cdp.cdp_client.send.Runtime.evaluate(params={'expression': 'document.title', 'returnByValue': True}, session_id=cdp.session_id))"
browser-use python "print(result['result']['value'])"

Emulate a mobile device

browser-use python "cdp = browser._run(browser._session.get_or_create_cdp_session())"
browser-use python "browser._run(cdp.cdp_client.send.Emulation.setDeviceMetricsOverride(params={'width': 375, 'height': 812, 'deviceScaleFactor': 3, 'mobile': True}, session_id=cdp.session_id))"

Get cookies via CDP

browser-use python "cdp = browser._run(browser._session.get_or_create_cdp_session())"
browser-use python "cookies = browser._run(cdp.cdp_client.send.Network.getCookies(params={}, session_id=cdp.session_id))"
browser-use python "print(cookies)"

Tips

• Each browser-use python call is one statement. Multi-line strings work for for loops and if blocks, but you can't mix statements and expressions. Use multiple calls.
• Variables persist: set cdp = ... in one call, use cdp in the next.
• The browser._run() bridge has a 60-second timeout. For long operations, increase it or use the async internals directly.
• All CDP domains are available via cdp.cdp_client.send.<Domain>.<method>(). See the Chrome DevTools Protocol docs for the full API.