nullify-guard

Stops AI browser agents from being clickjacked. Playwright-Python wrapper for Nullify Agent Guard: every click lands on what is visible at that point, or is refused with a reason the agent can act on.

pip install nullify-guard
playwright install chromium

from playwright.async_api import async_playwright
from nullify_guard import guard, NullifyBlockedError

async with async_playwright() as p:
    browser = await p.chromium.launch()
    context = await browser.new_context()
    g = await guard(context)                 # before any navigation
    page = await context.new_page()
    await page.goto("https://example.com")

    try:
        await page.mouse.click(400, 300)     # checked automatically
    except NullifyBlockedError as e:
        print(e)                             # says what was really under the pointer

    text = await g.visible_text(page)        # page text without hidden text, for your model

Sync Playwright: from nullify_guard.sync_api import guard (same methods, without await).

Same engine and behaviour as the npm package @nullifyads/agent-guard, including its limits: Chromium only, and visible prompt injection still reaches your model.

MIT License.