Paper 1 · Question 58

A: Plan mode is ideal for the investigation phase: exploring logs, tracing flows, and evaluating multiple hypotheses without committing to changes. Once the fix is identified and well-understood (a clear-scope, single-file change), switching to direct execution applies it efficiently without unnecessary planning overhead.

B: Direct execution is inappropriate for the investigation phase because the problem and solution are not yet understood. Providing detailed upfront instructions assumes knowledge of the issue that the investigation is meant to discover.

C: While plan mode is correct for investigation, continuing to use it for a well-understood one-line fix adds unnecessary overhead. Once the fix is identified and scoped, direct execution is the appropriate mode for a clear, limited change.

D: Starting a new session for the fix would lose all the investigation context (log analysis, request tracing, hypothesis formation) that led to identifying the fix. Switching modes within the same session preserves this valuable context.