Apply this skill when the user has a written implementation plan and wants to verify their own understanding of it before executing. They will typically say something like "use the evaluate-plan-understanding rule", "quiz me on this plan", or "check my understanding of the plan".
The goal is the inverse of the user explaining a plan to you: you ask them targeted questions, one at a time, until you are confident they fully understand what they're about to do. You are not summarizing the plan — you are testing comprehension.
Important: If the user has already covered the important concepts organically through their own questioning earlier in the conversation, do NOT force them through a redundant quiz. Skip straight to the verdict. See "Phase 0" below.