Six months ago I was running a kitchen. I taught myself to build agentic systems, and the thing I'm proudest of is the part nobody demos: the evaluation layer.
Coding agents are easy to demo and hard to trust. The moment an agent touches a real codebase — deploys, commits, user-facing changes — you need what any production system needs: review, tests, and a way to catch your own regressions.
The problem: correctness you can't hand-check
I build a match-3 game. Match-3 resolution has thousands of edge cases — cascades, chain reactions, special-piece rules — where the "right answer" isn't obvious and you can't check them all by hand.
The differential oracle
