How do you use AI tools when you code? How do you know the code the AI wrote is correct?

The interviewer isn't asking whether you use AI; they want to know whether you stay in control of the code you submit. A good answer describes a concrete process:

1. Define "correct" before asking the AI. Write a short requirement with a few example inputs and expected results, including the error cases. For example: the message "coffee 35k" must give 35,000 đồng, and a message with no amount must be rejected.
2. Turn the examples into tests, let the AI write code until the tests pass, and run the tests again yourself.
3. Read and be able to explain every part of the code before committing. Anything you can't explain, ask about again or rewrite.
4. Try cases beyond the examples. Tests only protect what you thought of; "35 thousand" might be read as 35 đồng while every test stays green.
5. Check APIs and libraries against the official documentation, because AI can call functions that don't exist or use outdated syntax.
6. Never paste secrets (API keys, customer data, company code you aren't allowed to share) into an AI tool.

Bonus points: tell a specific story of when you caught AI-written code being wrong, and how you caught it.