# Bonsai

- **Event:** [Built with Opus 4.7: a Claude Code hackathon](https://cerebralvalley.ai/e/built-with-4-7-hackathon)
- **When:** Apr 21 at 12:00 PM – Apr 27 at 2:00 AM (EDT)
- **Where:** Online
- **Team:** [Garrett Cahill](https://cerebralvalley.ai/u/Garrettc)
- **GitHub:** https://github.com/garrettc23/bonsai
- **Demo video:** https://youtu.be/JlCOw8Q5-Ds
- **Gallery:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/280

Bonsai is an agent that manages your personal expenses. People leak money across insurance, rent, credit lines, taxes, medical, utilities, and subscriptions, but the savings on any single bill aren’t worth the time to investigate. So nobody does. Bonsai automates the work end to end. Upload a bill, and the agents audit it, drafts an appeal, and negotiates by email or phone.

Four agents split the job:
1) The analyzer finds opportunities to lower your bill.
2) The contact resolver finds the billing department’s email and phone.
3) The negotiation agent emails or calls the provider and handles the back-and-forth.
4) The comparison agent runs in the background, hunting for cheaper providers you could switch to.

Try it: https://bonsai.firebaystudios.com

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Markdown version of https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/280. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt