Tell me about an agent or tool-using workflow you built. How did you stop it from looping or taking the wrong action?

What the interviewer is looking for

• This question tests agents & tool use. Designs tool schemas, step limits, state handling and guardrails, and knows when a fixed workflow beats an open-ended agent.
• Strong answers: Well-described tools, step and cost limits, validation of tool inputs, checkpoints for risky actions, and tracing to debug behaviour.
• Likely follow-up: How did you debug it when it did go wrong?

Another way it may be asked: Imagine an assistant that can search, call other systems and update records. How do you keep it from going in circles or doing something harmful?

A structure to follow: Answer, explain, example, limits

1. Step 1

   Answer

   Give your direct answer in the first sentence so the interviewer knows where you are going.

2. Step 2

   Explain

   Say how it works or why you would do it that way, in plain words before jargon.

3. Step 3

   Example

   Anchor it in something you have actually done or seen, with the detail that shows hands-on experience.

4. Step 4

   Limits

   Say when your approach would not be the right one. It shows judgement.

This is guidance on shape, not a script. Use your own real experience and facts; never invent details to fill a gap. See the STAR guide and answer frameworks.

Common slips

• Reciting a definition without showing you have applied it.
• Using terms you cannot explain if asked a level deeper.
• Claiming experience beyond what you can discuss in detail.

How to practise it

Say the answer in 90 seconds, then answer the follow-up as if it were a new question.

Related questions

• When would you build a fixed workflow with a model at certain steps, versus giving an agent freedom to plan its own steps?
• In simple terms, what is retrieval augmented generation, and why would you use it instead of just asking a language model directly?
• A chatbot you built keeps giving long rambling answers. What would you change first?
• What is prompt injection, and how might it affect an assistant that reads customer emails?
• Your document search assistant often answers using the wrong document. How would you debug and improve retrieval?

Browse all questions