Show HN: Reproducible failure drills for AI coding agents

Category: devtools

Tags: ai-coding-agents, testing, guardrails, reproducible-drills, typescript

Score: 6.8/10 (Innovation: 7, Technical: 6, Documentation: 8, Utility: 6)

A companion repository for a book on engineering with AI coding agents, featuring a set of reproducible failure drills and guard scripts that catch common agent mistakes. It provides a toy agent loop, an invoicing app, and an experiment kit for measuring harness effectiveness, all with zero runtime dependencies.

Target audience: backend devs, devops, AI engineers

Repository: https://github.com/second-time-is-a-bug-book/book-companion · TypeScript · MIT · 3 stars

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