Copilot is useful as a second pair of eyes before a commit. The key is to ask for focused review rounds.
Round one: runtime bugs
Ask only for issues that may break execution: null values, async order, transactions, exceptions and concurrency.
Round two: security
Check injection, XSS, permission bypass, sensitive output, file upload and open redirects in business context.
Round three: readability
Only after logic and security should you ask for naming, duplication, function size and comments.
Ask for minimal changes
Do not let AI rewrite the whole file unless tests protect the behavior. Request risk-ranked, minimal patches.