# Gemini Display Kit

- **Event:** [Google I/O Hackathon](https://cerebralvalley.ai/e/google-io-hackathon)
- **When:** Sat, May 23 at 9:00 AM – 10:00 PM (PDT)
- **Where:** Shack15, San Francisco, CA
- **Team:** [Sid Kandan](https://cerebralvalley.ai/u/sidk)
- **GitHub:** https://github.com/sidkandan/GeminiDisplayKit
- **Demo video:** https://www.youtube.com/shorts/6Gl1k9jtep4
- **Gallery:** https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery/56

Three commands ship a Gemini-powered game on Meta Ray-Ban Display.
Meta's smart-glasses Web App surface just opened up. It's a 600×600 HUD driven by Neural Band swipes — powerful, but it can't hold an API key, open a camera, or call Gemini directly. Every developer trying to build something good on it has to reinvent the same stack: a bridge server, an SSE pipe, a Cloudflare tunnel, an install QR, and wrappers for every Gemini surface. Gemini Display Kit packages that stack as a CLI + SDK. npx gdk create my-game --template adventure && gdk dev boots the bridge, mints the install QR, and the game is on the lenses in 90 seconds.

The framework treats Gemini Managed Agents as the creative spine, not a chat box. The repo ships real captured code_execution_call traces in-tree at examples/prompt-arena/data/traces/m_emberton.json — a managed agent that wrote Python and ran it in a remote Linux sandbox to tune a monster's battle strategy. Scrollable proof of server-side code execution, persisted state, and structured output. That's the managed-agents prize claim, committed to git.

Two original games ship as live demos:
OMNI-ODYSSEY is a generated illustrated adventure. Gemini Flash narrates each beat with memory across choices; Nano Banana paints every scene on demand; Veo opens it with a cinematic. The audience plays too — they scan a QR for /conjure, describe a monster in plain English, Nano Banana paints it, and it appears in the live on-stage story as an encounter their character must face. Pure generation; vision input never used.

PulseBlade360 is an original 360° wearable rhythm game. Gemini Flash designs the level structure as JSON, Lyria scores the backing track, a managed agent reviews the level for balance. The player turns and swipes as targets enter the hit zone. Not Beat Saber; not an image analyzer.

Built 100% during the hackathon (2026-05-23). Every commit timestamp is within event hours; PROVENANCE.md is the file-by-file ledger. The only non-original code is @google/genai and qrcode npm deps.

Google APIs used: Gemini 3.5 Flash (narration + structured JSON), Gemini Managed Agents via the Interactions API with code_execution_call and persistent threads, Nano Banana (gemini-3.1-flash-image-preview) image generation, Lyria 3 music generation, Veo image-to-video for cinematics, Gemini TTS, and the @google/genai JavaScript SDK.

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Markdown version of https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery/56. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt