# Oneline

- **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:** [Chanjoong Kim](https://cerebralvalley.ai/u/chanjoongx)
- **GitHub:** https://github.com/chanjoongx/oneline
- **Demo video:** https://www.youtube.com/watch?v=Lm403MpBo_Y
- **Gallery:** https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery/26

Oneline: software for one. Describe the exact tool you need in one line, and get it running on your phone in under a minute, built for the single person asking instead of a market. A planner trims the request, three candidate tools build in parallel inside Gemini Managed Agents sandboxes, a three-layer judge scores each (functionality via Playwright inside the sandbox, UX clarity, design coherence), a deterministic selector picks the winner, and it deploys to Cloud Run with a QR code. Each losing candidate's mistakes become lessons that improve the next build. Not an app builder like Lovable or V0 which ship to a market; Oneline builds a disposable tool for the one person who asked, used, and throws it away.

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Markdown version of https://cerebralvalley.ai/e/google-io-hackathon/hackathon/gallery/26. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt