Chapter 12 ai Assist Prompt Patterns

---
title: "3.4 Prompt Patterns for AI-Assisted Systems Design"
part: 3
chapter: 12
status: v3
version: v3
written: 2026-05-24
author: 이민수
ip_check: done
---

# 3.4 Prompt Patterns for AI-Assisted Systems Design

It was the week right before the alpha build. I added one new class row to the skill sheet and saved. What I did not learn until the build broke the next morning was that the buff ID this class referenced was a row someone had deleted the day before. Tracing back through the broken build to find the cause took two hours. Two hours I would never have spent if I could simply have asked, before that row was deleted, "Is this safe to delete?"

This chapter is about putting that question in the AI's job description. The core is not a knack for writing good prompts. It is making sure you never rewrite the same question from zero — pinning it down. Section 3.2 laid the schema, 3.3 the relation map. Both were the skeleton of the data. This chapter takes the questions a human throws at AI on top of that skeleton and hardens those questions themselves into assets.

Let me nail one thing down first. What AI produces is not an answer — it is a candidate. In every pattern in this chapter, the hand that makes the final decision stays on the human side to the very end.

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## 3.4.1 Two Places Where Ad-Hoc Prompts Leak

When you first start using AI, you type a fresh natural-language prompt on the spot every time. Something like this.