Build an asynchronous Magic: The Gathering app with Codex
I used /goal in OpenAI's Codex to build a Magic: The Gathering app so my brother and I can play asynchronously without needing to coordinate a call or awkwardly play over FaceTime. The idea is to let each of us take turns when we have time, track the board state cleanly, and keep a game going over days instead of trying to line up schedules. The command allowed Codex to continue running until everything was done, basically one-shotting exactly what I was looking for without any intervention. 1. I defined the core problem: two people needed to play asynchronously without coordinating a call. 2. I described the app’s essential behavior, including turn-taking, persistent board state, and games that continue over multiple days. 3. I used /goal in Codex so the build could continue autonomously toward the finished result. 4. I let Codex implement the app and resolve the work without requiring step-by-step intervention. 5. I tested the finished flow to make sure each player could return later and continue from the correct state.
One-shot an app that keeps board state and supports turns over multiple days without coordinating a call.
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