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![simonw Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::12497.png) Simon Willison [@simonw](/creator/twitter/simonw) on x 111.6K followers
Created: 2025-06-16 13:21:12 UTC

If you use "AI agents" (LLMs that call tools) you need to be aware of the Lethal Trifecta

Any time you combine access to private data with exposure to untrusted content and the ability to externally communicate an attacker can trick the system into stealing your data!

![](https://pbs.twimg.com/media/GtkWaMUa0AAadOA.jpg)

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[Post Link](https://x.com/simonw/status/1934602159984984235)