Why it matters

Prompt defenses are cheapest. Understanding shapes baseline.

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The architecture

System instructions repeated.

Sandwich user content between instructions.

Explicit role hierarchy.

Prompt eng defensesRepeat instructionsreinforceSandwich userinstr + user + instrExplicit hierarchysystem > userAlone insufficient; use as cheap first layer with structural + detection
Prompt eng defense.
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How it works end to end

Instruction repetition.

Post-user reminder.

Explicit trust levels in prompt.

Constrained output format.