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AI Security

Interview question · LLM Application Security

Your assistant's answers about one product changed overnight. Was the index poisoned or a source edited?

An integrity investigation with three suspects: the sources, the index and the model. The scored answer uses versions and provenance to tell them apart quickly.

mediumNewPreparation tags: Microsoft, Google, AmazonUpdated Nov 2026

An integrity investigation with three suspects: the sources, the index and the model. The scored answer uses versions and provenance to tell them apart quickly.

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

Users report that an internal assistant's answers changed noticeably overnight, although nobody deployed anything.

  1. What can change answers without a deployment?
  2. What if one knowledge base document was edited yesterday?
  3. What if the model provider updated the model?
  4. How do you make such changes visible in future?
  5. What if the change was a safety regression?
  6. What would you put in place?

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.

UP NEXT ON YOUR JOURNEY
Next in this trackDesign abuse policy, reporting and enforcement for a consumer generative AI feature.Next in this trackYour product team is adding an AI assistant to an existing SaaS product. What changes in the threat model?Next in this trackWrite a sanitiser that keeps links and images in streamed model Markdown inert until they are validated.
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