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Interview question · Agent, Tool & MCP Security

How does trust propagate in a multi-agent system, and where do you put the boundaries?

Map the caller, task grant, data audience and execution boundary at each handoff. Explain how a valid internal message can still request an unauthorized action.

hardNewUpdated Nov 2026

Map the caller, task grant, data audience and execution boundary at each handoff. Explain how a valid internal message can still request an unauthorized action.

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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

Alder’s planner submits a valid JSON order proposed by a research worker. The order service authenticates the planner successfully.

  1. Is the order ready to execute?
  2. What if the task is a nightly catalog refresh with no human requester?
  3. What if the planner reads confidential bid comparisons?
  4. Which evidence would make the design review convincing?

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 trackHow should untrusted documents and web content enter an agent workflow?Next in this trackWhat are the security risks of agents that operate a browser or a desktop, and how do you contain them?Next in this trackHow can one compromised or faulty agent cascade through a system, and what circuit breakers stop it?
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