Sequential Thinking · elmaxid bundle This skill should be used when facing complex architecture decisions, multi-step root cause analysis, comparing multiple approaches with trade-offs, debugging that requires hypothesis tracking, planning with branching possibilities, or any problem requiring structured step-by-step reasoning with potential revisions. Trigger phrases include 'think through this', 'analyze step by step', 'reason about', 'evaluate options for', or when a problem has 3+ interacting factors.