How I Built GM-Genie: A Cinematic AI Game Master with Gemini Live API

This project was created for the Gemini Live Agent Challenge hackathon The Problem: Text-Only RPGs Break Immersion Every tabletop RPG player knows the feeling — your game master describes a breathtaking ruin half-swallowed by ash dunes, but all you see is... a chat window. Text generates the world in your mind, but there's a ceiling on how cinematic that experience can get. What if your AI game master could show you the world as it narrated, play a sound effect when the door creaks open, shift the ambient drone when combat starts — all without breaking the flow of conversation? That's what I built with GM-Genie: a voice-first RPG narrator that weaves AI-generated scene art, dynamic sound effects, and real-time audio narration into a single seamless experience. You talk to your GM, your GM talks back — and the world materializes around you. Architecture: From Multi-Agent to Zero-Tool Here's the honest story: the architecture you see in the final version is not the one I originally desig