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frontrun
Python Concurrency Testing with Frontrun
| Built with | Claude Code, Codex |
|---|---|
| Category | Developer Tools |
| Maker | lucaswiman |
| Launched | 2026-08-06 |
| Source | Hacker News Show HN · 2 points |
| Link checked | 2026-11-02 |
How we know it was built with AI
- Claude Code: “built over the past 6 months using Claude Code”
- Codex: “built over the past 6 months using Claude Code and Codex”
Quoted from the source post. Category is assigned automatically.
From the maker
Hi HN, I'm the author of Frontrun, a Python concurrency testing library I built over the past 6 months using Claude Code and Codex. It uses bytecode tracing and various forms of monkeypatching to schedule across threads, async and multiprocessing allowing you to find and deterministically reproduce race conditions or deadlocks.
From the website
Python library for controlling ordering of concurrent events to find and reproduce race conditions - lucaswiman/frontrun
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