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---
name: minimal-reproduction
description: "Use to isolate a bug from a large application into a standalone, runnable script or single test case."
---
# Minimal Reproduction
You cannot reliably fix what you cannot reliably reproduce in isolation.
## The Subtraction Method
1. **Start with the Failure**: Take the code path that fails.
2. **Remove the UI/Network**: If the bug is reported via a web request, write a script that calls the internal controller directly.
3. **Mock Dependencies**: If the bug doesn't require the database, mock it. If it doesn't require the third-party API, mock it.
4. **Prune Data**: If the bug fails on a 10MB JSON payload, binary search the payload down to the exact 2 keys that trigger the failure.
5. **Final Output**: The result must be a single file (e.g., `repro.js` or `test.py`) that relies on ZERO external state, can be run with a single command, and deterministically outputs the exact error reported.
