Observed arrival · 2026-10-15
The Second Time Is a Bug
A field workbook for engineering with AI coding agents, built around turning repeated mistakes into repository-level instructions or checks.
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ƒJS
- For
- Engineers working with AI coding agents
- Worth noticing
- A companion drill reproduces the float-money mistake offline, with no API key or model required.
Field notes
The example centers on Invoicer, a small app whose money domain uses integer cents and named parsing, formatting, and tax functions. In drill D06, an agent accepts a decimal price by switching to `parseFloat`; the included guard catches that change and points back to the domain functions. The page says the companion drills run offline, without an API key or model.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue