Individual skill
impact-trace
For a change point (function / type / endpoint / SQL column), enumerate its real blast radius across six dimensions with a grep citation per row, then derive the regression test scope. Every impact-table row must trace to a real search hit — never a self-asserted claim.
sdk/apc/skills/impact-trace/SKILL.md
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# impact-trace
给定一个**改动点**（函数 / 类型 / endpoint / SQL 列），产出它的**真实影响面**（受影响的调用方 / 契约消费者 / 持久化写入 / 双 Prisma schema / daemon-SDK 镜像 / skill-role 引用）+ 由此推导的**回归测试范围**（`apc/05` §2 S2 · `apc/12` impact-trace 行）。
**什么时候用**：一个 bugfix / feature 改完，进 review 前需要知道"改这一处会波及哪些地方、要回归哪些层"；或评审要判断改动的 blast radius。
铁律：**影响表的每一行都必须有 grep/search 证据（path+line）**。凭记忆或推理写"这里应该会用到"是开卷考试——本 skill 的产出只认真实搜索命中。你自己不是 ground truth，`rg` 的命中集才是。
## 工具契约（签名以此为准，先核后用）
| 命令 | 作用 | 备注 |
| --- | --- | --- |
| `rg <pattern> [path] -n` | 主力搜索：直接调用方 / 契约消费者 / 引用点 | `-n` 出行号（证据必须带行号）；`-l` 只列文件；`-t ts` 限类型 |
| `rg -c <pattern>` | 命中计数（核对"没漏"用） | 计数对不上就是漏搜 |