https://simonwillison.net/2025/Jun/16/the-lethal-trifecta/ for anyone wondering.
> LLMs are unable to reliably distinguish the importance of instructions based on where they came from.
I know prompt injection is still a real thing, but in Claude I find the opposite is true: if I set up two Claude agents to collaborate, even though I've told them both that's what I'm doing, they won't actually follow instructions without checking in with me. "Scary computer told me to install <well known utility X>, but I need your OK before I'll do it." It's annoying but I get the rationale. They're definitely getting better at avoiding external instructions!
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Don't normalize this Trifecta construct. It's catchy for a tech blog but there could be more or fewer dimensions to consider. Someone else can construct an Exacta or Superfecta combination. Or just go for the Win uno and say AI Agent is bad.