One signal

Security researcher Matthew Green argues that an AI agent could carry malicious instructions from one agent to another through shared tools such as email, Slack or document stores.

Why it matters

In a passage quoted by Simon Willison on 1 October, Green describes this as the ingredients for a potential “worm”: one agent is hijacked, then passes instructions to another. The example is a warning about how agents might interact, not evidence of a real-world attack.

Discuss: Should agent developers treat shared email and document access as a security boundary, or is that too cautious for a risk that remains hypothetical?

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