Engineering

Build notes, not tutorials

What actually broke, what we tried that didn't work, and what fixed it - written from real production incidents while building 3Stone AI's products.

August 10, 2026 · 7 min read
The bug that wasn't where we thought it was: debugging EBADF on Vercel
Building a real headless-Chrome WCAG scanner as a Vercel serverless function, and the three-layer debugging trail (Chromium extraction, sync vs. async file reads, and a webpack asset rule) that finally fixed a production-only EBADF.