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Interview question · Agent, Tool & MCP Security

Can the same model that proposes an agent's action also approve it, or act as its guardrail? What should decide instead?

Separate enforceable permissions from behavioral review. Measure the checker on the proposer’s actual failures, track legitimate actions it blocks, and test the execution service even when every model recommends proceeding.

mediumNewUpdated Nov 2026

Separate enforceable permissions from behavioral review. Measure the checker on the proposer’s actual failures, track legitimate actions it blocks, and test the execution service even when every model recommends proceeding.

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 4 follow-ups like an interviewer would

A support assistant proposes replies with attachments. A model reviewer can flag mistakes, while a delivery service independently checks recipient permission and any required human approval.

  1. What if the reviewer permits 18 of 60 unacceptable proposals?
  2. What if a different model reviews the same misleading source?
  3. What if the execution service trusts the tenant ID supplied by the model?
  4. What would you test before using the reviewer in a release?

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
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