Debug Error Skill

Degree of freedom: MIXED. Root-cause judgment [HIGH freedom]; the red feedback loop and verify-green re-run [LOW freedom — run exactly].

Systematic approach to debugging errors and unexpected behavior. Works with any project.

How to reason

1. Observe — exact symptom, stack, environment, first-seen
2. Interpret — crash site vs producer; FE / BE / integration / data
3. Classify — null-access / contract / env / race / unknown
4. Severity — prod-wide auth break outranks a single-user edge

Worked example