.@simonw coined the term "lethal trifecta": when an AI agent has (1) access to private data, (2) exposure to untrusted content (i.e, incoming emails), and (3) the ability to exfiltrate data (i.e replying to email).

"This combination is a huge security problem.

The only way to… https://t.co/1GPwWNcvLt pic.twitter.com/94PlGhsSfc

— Lenny Rachitsky (@lennysan) 9 avril 2026

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@simonw coined the term "lethal trifecta": when an AI agent has (1) access to private data, (2) exposure to untrusted content (i.e, incoming emails), and (3) the ability to exfiltrate data (i.e replying to email). "This combination is a huge security problem. The only way to

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