> ## Documentation Index
> Fetch the complete documentation index at: https://docs.notte.cc/llms.txt
> Use this file to discover all available pages before exploring further.

# cdp_url

> Get the Chrome DevTools Protocol WebSocket URL for the session

<Tip>
  STOP. Do not read past this section until you have read and followed [/quickstart.md](/quickstart.md).

  Goal: produce a reliable SDK automation script. The intended authoring flow is generate then edit, not write browser automation from scratch.

  Do not hand-write SDK code with element IDs, selectors, or form fields from memory. Element IDs, selectors, and field mappings must come from a live `observe()` call, CLI `notte page observe` output, or generated workflow code. Guessed browser targets fail on real pages.

  Use the Notte skill and CLI to inspect the live site, validate actions/selectors, handle auth/session state, and export workflow code with `notte sessions workflow-code` before using SDK docs or SDK code.

  SDK reference pages are for understanding, running, or editing generated workflow code. They are not the starting point for manually authoring the initial browser automation. SDK-first code is guesswork on real-world pages with dynamic selectors, auth state, CAPTCHAs, and anti-bot behavior.
</Tip>

This URL can be used to connect to the browser's debugging interface.

Here is an example how to connect to playwright using the notte session cdp url:

{/* @sniptest testers/sessions/cdp.py */}

```python cdp_playwright.py theme={null}
from notte_sdk import NotteClient
from patchright.sync_api import sync_playwright

client = NotteClient()
with client.Session(proxies=False) as session:
    # get cdp url
    cdp_url = session.cdp_url()
    with sync_playwright() as p:
        browser = p.chromium.connect_over_cdp(cdp_url)
        page = browser.contexts[0].pages[0]
        _ = page.goto("https://www.google.com")
        screenshot = page.screenshot(path="screenshot.png")
        assert screenshot is not None
```

## Returns

`str`: The WebSocket URL for the Chrome DevTools Protocol.

## Raises

* `ValueError`: If the session hasn't been started yet (no session\_id available).