Diagnose

Diagnose is for problems that are still poorly shaped. Before deep debugging, build the smallest feedback loop that proves whether each change helps or hurts. A fast loop usually does more for bug finding than another round of guesswork.

When to Use

• The symptom is real, but the shortest reliable repro is still unclear
• A bug, regression, or performance issue needs a faster test loop before fixing
• Multiple causes seem plausible and you need to rank them instead of chasing all of them
• The system is large enough that targeted instrumentation beats broad logging

When NOT to Use