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Interview question · Agent, Tool & MCP Security

A prompt injection caused an unauthorized tool call in production. Walk through containment and the fix.

Contain affected authority, preserve evidence in parallel and reconcile actual effects. Work through shared inputs, queued jobs, uncertain outcomes and a tested path back to useful service.

mediumNewUpdated Nov 2026

Contain affected authority, preserve evidence in parallel and reconcile actual effects. Work through shared inputs, queued jobs, uncertain outcomes and a tested path back to useful service.

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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

An export was requested after ticket T-42 was retrieved. The destination is internal, the chat session is stopped, and a worker queue still contains export jobs.

  1. Has stopping the chat contained the incident?
  2. Does the internal destination make the export acceptable?
  3. Does T-42 appearing just before the call prove injection caused it?
  4. What must be true before exports resume?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Sign in free to open it.

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