Individual skill
bug-reproduce
Turn a known bug into a tight, red-capable reproducer, then prove the reproducer locks that bug with a reversal negative control (reintroduce the bug → reproducer must go red again). Use at the start of a bugfix, before theorizing about the cause.
sdk/apc/skills/bug-reproduce/SKILL.md
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# bug-reproduce
把一个**已知 bug** 变成**紧、可变红**的复现器（失败测试 / 脚本），然后用**反转负控**证明这个复现器真的锁住了那个 bug——**不是恰好绿着**（`apc/05` §2 S1 · `apc/12` bug-reproduce 行；纪律移植自 built-in `diagnosing-bugs` 的 Phase 1 复现 loop）。
**什么时候用**：一个 bugfix task 开工的**第一步**——在读代码建假设之前。`diagnosing-bugs` 的铁律：没有一个能对**这个** bug 变红的信号，再多盯代码也没用。本 skill 只补 `diagnosing-bugs` 缺的那一环：**负控——把 fix 撤掉/把 bug 注入回去，复现器必须变红**。
铁律：一个复现器只有走完 **RED → GREEN → 反转 RED** 才算数。**只到 GREEN 不算**——一个无论 bug 在不在都绿的"复现器"是开卷考试，不是复现（`apc/12` §0 负控纪律）。
## 复现器四判据（照 diagnosing-bugs Phase 1 完成标准）
一个复现器必须是：
| 判据 | 含义 |
| --- | --- |