Why AI Agent Guardrail Prompts Fail Under Prompt Injection — And How Pre-Deterministic ACP Truth Tables Fix It
This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.
Guardrail prompts are advice, and advice is exactly what a prompt injection overwrites. If an agent's only defense is a system prompt that says "never wire money without approval," an attacker who controls any text the agent reads can talk the model out of it. The fix is to move the decision out of…
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- 2026-10-28 01:29 · DEV Community — AI
Why AI Agent Guardrail Prompts Fail Under Prompt Injection — And How Pre-Deterministic ACP Truth Tables Fix It