We used GPT-6 Astra through the OpenAI Responses API as Tilth’s dungeon master. Astra generates structured adventure content and interprets players’ free-form actions using the current scene, party state, and recent history. Structured outputs connect its decisions to the game engine, which validates actions and controls movement, dice, damage, and progression. This lets players express creative ideas while keeping multiplayer outcomes consistent. We also used Codex throughout development to build and refine the game engine, multiplayer rooms, pixel-art rendering, interfaces, and automated tests.
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