error-handling-debug
When errors cascade instead of being contained — exception hierarchies, retry strategies, graceful degradation.
60-debugging — Debugging
3 skills in this category.
log-analysis
When the answer is buried in 10,000 log lines — parsing, pattern recognition, event correlation, anomaly detection.
root-cause-analysis
When the bug is a symptom, not the cause — 5-whys, fault trees, git bisection, symptom-to-cause mapping.