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AI agents now routinely run code they wrote or were told to run — and prompt injection means an attacker can choose that code. So the safe assumption is that every line the agent executes is hostile, and your job is containment. Here's the isolation spectrum from bare process to Firecracker microVM, why a Docker container is not a security boundary against hostile code, and how to build an ephemeral, egress-filtered sandbox that survives a successful injection.