---
title: "Build a test harness to break your database · Lenexa Learn"
description: "Not fully trusting the AI or themselves, a developer had an agent build a Jepsen-style harness on their homelab to push their database until it broke."
url: https://www.lenexa.ai/learn/agents/build-a-test-harness-to-break-your-database/
site: "Lenexa Learn"
---

Codex

# Build a test harness to break your database

Not fully trusting the AI or themselves, a developer had an agent build a Jepsen-style harness on their homelab to push their database until it broke.

## Steps

1. Describe what could go wrong.
2. Ask for a test harness.
3. Run it.

## Prompt you can copy

```
Build a test harness that injects failures into my database cluster.
```

## What you get

A way to stress-test the database.

## Source

[hn](https://news.ycombinator.com/item?id=47396393) · March 2026

For Developers. [Codex](https://www.lenexa.ai/learn/agents/tool/codex/). Added October 12, 2026. Shared by @skel84.

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