Thinking on product truth, behavior specs, and building software teams can reason about.
Subscribe via RSSShipping fast with AI coding tools is genuinely good. The problem isn't the speed — it's what gets left behind. Product reasoning doesn't survive the vibe.
A .pbc.md file opens in VS Code, renders on GitHub, reads like any Markdown doc. Drop it into pbc.stewie.sh and the same file becomes navigable UI.
After hitting the same product knowledge gap across multiple SaaS products, I built an open Markdown spec for capturing what your product promises to do.
A Product Behavior Contract (PBC) is a living, code-grounded spec that describes how your product actually behaves — not how you think it does.
Product knowledge lives in heads, not docs. Here's why that gap compounds — and what a behavior spec does about it.