Beyond Sandboxing: Why Fake Tokens Are the Answer to AI Agent Security

Traditional security approaches fail at their core premise: if an AI agent can access a real API token, it can leak it through prompt injection, malicious packages, or logging. This article presents a paradigm shift—instead of protecting tokens inside untrusted processes, pass agents a fake token (whose value equals its own name) and swap in the real token at a trusted boundary. This elegant approach makes leaked tokens worthless to attackers by protecting boundaries rather than tokens themselves.