# One Rule, One Throwaway Skill > Source: > Published: 2026-11-10 00:00:00+00:00 # One Rule, One Throwaway Skill By [Justin Poehnelt](https://justin.poehnelt.com/about/) Published 1 min read At the [AI Engineer Code Summit](https://ai.engineer/code/2026/schedule), I shared how I used ast-grep rules to block new uses of old patterns in CI and a throwaway skill to show agents how to migrate TypeScript code to Effect. Focus the deck and use arrow keys, or swipe.