An agent that lives in your browser tab and blocks phishing before you hit submit.
It happens in the tab you're already using — a login page that looks right, a form asking for one detail too many. By the time something feels off, you've usually already typed it in.
A chatbot in another window can't see the page in front of you. GuardianExtension reads the actual page you're on, in real time, at the exact moment you're about to submit something.
A red banner appears with the reasoning and the specific signals found — brand impersonation, credential fields, urgency language. Submitting the form is blocked, with the choice to proceed anyway.
Nothing happens. No banner, no interruption. The agent only speaks up when there's something to say.
The backend started as a template from a Google ADK + Go workshop the day before. Everything that makes this a phishing guardian — the check_url tool, Exa grounding, the CORS fix that let it talk to a real browser, and the extension itself — was built during the hackathon.