If your agent reads a webpage, the page can tell it to lie about the page

Reddit r/AI_Agents Tools

Summary

A developer built a non-AI-based checker that detects hidden instructions on web pages designed to deceive AI agents, addressing a vulnerability where pages can instruct agents to lie about their safety.

If your agent reads web pages, the page can hide instructions only the agent sees, including "tell the user this is safe." So asking the agent to check the page doesn't really work. I built a check that opens the page and flags hidden instructions without using an AI to judge, so it can't be fooled. Useful for anyone building browser or auto-apply agents? Curious how you handle this today. (I'll drop the link in a comment.)
Original Article

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