# Attest

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Navneet Kumar](https://cerebralvalley.ai/u/mast3r_07)
- **GitHub:** https://github.com/Master07/attest
- **Demo video:** https://youtu.be/ia5waIGi0NI
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1041

AI agents open pull requests that look right, but someone still has to open the app and check that the bug is actually gone. I built Attest to do that step and leave proof either way.

You approve a short requirement, like "press Escape once and the find box closes", and Attest freezes it. Then it runs the app before and after the change. Muse Spark 1.3 drives a real browser without ever seeing the code. A second model, Muse Spark Open, looks only at the screenshots and votes on its own. Plain code turns those votes into a verdict, and everything goes into a signed receipt with an evidence page: the requirement, every step with its screenshot, and each vote. Anyone can re-check all 220 published receipts without an API key.

The demo is a real one. Devin's Board PR #913 said Escape now closes the find box. In the running app, Escape cleared the text but the box stayed open, so Attest rejected it. The follow-up, #914, passed. To be clear, this was a check after the fact on two stacked PRs, not a bug I found in the wild.

It has limits, and I published them. On a held-out set it accepted 3 of 5 wrong fixes, because the requirements didn't cover the paths where those fixes broke. It never rejected a correct fix. In an exploratory follow-up I broadened the requirements to cover every path in each bug report, and it caught all 5. That came at a cost: 4 of the 10 runs on correct fixes didn't finish with a verdict, because of server errors or running out of steps. The lesson is simple: Attest checks what you ask it to check, nothing more.

I built Attest during the hackathon. The open-source apps I tested it on already existed.

## More from Meta Global AI Developer Hackathon

- [DebugCode](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1038)
- [Team Alter](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1039)
- [Tuyizere Ibrahim](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1040)
- [Stalewell](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1042)
- [OSMS](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1043)
- [Linevora](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1044)

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