Debugging is a strong use case because Claude Code can search the repository, trace references, inspect logs, run tests, and compare related code. Give it the exact error message, the command or request that caused it, and the behavior you expected. Ask it to reproduce or investigate the issue before changing code whenever possible. Request evidence for the suspected root cause instead of accepting the first explanation automatically. Once the cause is understood, ask for the smallest fix that solves the problem without changing unrelated behavior. Run the relevant tests and add a regression test if the bug could return later. This can be much faster than manually searching a large codebase because the agent can perform many investigation steps in one workflow. The developer should still review the reasoning and the diff because fast investigation does not guarantee a correct conclusion.

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