User confirms the bug is fixed. Clean up instrumentation and summarize.
Hypothesis-driven debugging with runtime log instrumentation. Use when user reports a bug, unexpected behavior, flaky test, or when runtime evidence is needed to understand code behavior. Invoke for issues like "X isn't working", "I'm seeing Y error", "why does Z happen", or when multiple code paths could cause the problem.
User confirms the bug was reproduced. Analyze logs and iterate on hypotheses.