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---
name: minimal-reproducer
description: Use when a bug is intermittent, complex, cross-layer, or buried in a large application and the causal input or boundary is not yet isolated.
---
# Minimal Reproducer
## Core rule
Reduce the failure until one controlled **variable** explains the difference between working and broken behavior.
Start from the real failing path and build the **smallest** case that can still **reproduce** the symptom. Remove unrelated files, plugins, configuration, data, and timing assumptions one at a time. Preserve the real boundary that may be causal: the actual parser, shell, serializer, protocol, or filesystem behavior.
Once minimal, vary one factor at a time and record the outcome. A reproducer that fails for a different reason is not useful.
Keep the final case as a regression fixture when practical; it should make the bug cheap to understand and impossible to reintroduce silently.
