I tested Surf-shield, the Chrome extension I built for the Chrome AI Built-in Hackathon, on my other Google account just to see how it would handle the flood of messages I get on Tumblr, sometimes 30+ a day. What impressed me was the nuance: Surf-shield, powered by the multimodal Chrome Prompt API and Gemini Nano, confirmed that the link reblogged from the real account was legitimate, but it still flagged the swarm of bot messages as suspicious. That’s exactly the kind of distinction I wanted it to make. The Prompt API didn’t stop at scanning URLs; it parsed the context, tone, and structure of the messages themselves. It wasn’t just asking “is this link safe?” but “does this message feel off?” And it did all of that locally, on-device.
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