Skill: impact-check

WHAT

Purpose và context

• Purpose: Before modifying any symbol (function, class, variable, config key), map all dependents so no callers blindsided.
• Trigger (when to use):
  • Before editing shared utility, base class, or widely-imported module
  • Before renaming or deleting anything
  • As first step of safe-change or propose
• Non-goals: không sửa code (output only); không tạo trang wiki cho symbol chưa document (chỉ ghi gap).

Mental model

symbol → mọi reference (import · call · đọc output) → Direct / Indirect → test refs tách riêng → báo cáo + wiki gap.