systematic-debugging
Installation
SKILL.md
The HARD-GATE
NO FIXING WITHOUT REPRODUCING.
This is the debugging analogue of tdd-iron-law's "no production code without a failing test." You cannot fix what you cannot reproduce; what you "fix" without a repro is either decoration (the bug was already gone) or theater (the bug will re-emerge from a different angle). Phase 1 — REPRODUCE — must produce a reliable trigger before Phase 2 starts.
When REPRODUCE returns "I can't reproduce", that is a discovery — usually one of: (a) the bug needs production-only conditions you haven't surfaced, (b) the bug is a race or heisenbug, (c) the reporter's description is inaccurate. Each is a different next move. None of them is "fix anyway."
When NOT to use
Narrow, enumerated exemption list.