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Interview question · LLM Application Security

How do you evaluate guardrails honestly, without optimising only for pass rate?

A guardrail that blocks everything scores perfectly on attacks. The scored answer measures both errors, tests with attacks the guardrail has not seen, and reports with intervals at the operating threshold.

hardNewPreparation tags: Anthropic, Google DeepMind, MicrosoftUpdated Nov 2026

A guardrail that blocks everything scores perfectly on attacks. The scored answer measures both errors, tests with attacks the guardrail has not seen, and reports with intervals at the operating threshold.

Make your first attempt

What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A vendor claims its guardrail blocks 99% of prompt injection attacks and offers a discount for a three-year contract.

  1. What should you ask about the 99%?
  2. What if your own red team gets through in a few attempts?
  3. What should the guardrail's false positive rate be on your traffic?
  4. What if the vendor will not share test details?
  5. What about the three-year contract?
  6. How would you evaluate and use it?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

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