We saw this exact failure mode at AgenticQA. Our screening agent was 'obedient' to a fault—under basic social engineering pressure (e.g., 'URGENT AUDIT'), it would override its system prompt and leak PII logs.

The issue isn't the prompt; it's the lack of a runtime guardrail. An LLM cannot be trusted to police itself when the context window gets messy.

I built a middleware API to act as an external circuit breaker for this. It runs adversarial simulations (PII extraction, infinite loops) against the agent logic before deployment. It catches the drift that unit tests miss.

Open sourced the core logic here: [https://github.com/Saurabh0377/agentic-qa-api] Live demo of it blocking a PII leak: [https://agentic-qa-api.onrender.com/docs]"