Prompt Guardrails Are Not a Primary Defense
WesEklund · x · 2026-07-13
The author points out that asking a model to "ignore malicious instructions" is as ineffective as telling an SQL database not to execute DROP TABLE. LLMs are fundamentally token predictors and will execute anything in the context that looks like an instruction.
Therefore, safety guardrails in system prompts should only serve as defense-in-depth. The real core defense is intercepting malicious content before it ever enters the model's context.
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