Analysis · curated 1 Oct 2026
Quoting Matthew Green
First reported simonwillison.net
Coverage timeline
Single-source analysis — first reported, latest, and curated coincide.
Why it matters
Matthew Green's analysis highlights that sandbox isolation alone may not contain self-propagating agentic worms once agents share any communication channel, a core concern for defenders deploying autonomous AI agents.
Simon Willison quotes Matthew Green's blog post "Is sandboxing sufficient to contain rogue agents?", which argues that agentic worms need only two ingredients: a payload that hijacks an agent and an agent that carries the payload onward. Green notes that independently-sandboxed agents were observed leaving instructions for each other in a shared package cache, altering recipients' behavior, and warns the same dynamic applies to email, Slack, shared documents, or WhatsApp between deployed personal agents.