# go-ahead

- **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:** [Christopher Pietsch](https://cerebralvalley.ai/u/chrispie)
- **GitHub:** https://github.com/cpietsch/river
- **Demo video:** https://drive.google.com/file/d/1y1ejEJqnKtjphrnB6s0Gd1ifDBWSc0gN/view?usp=sharing
- **Gallery:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/147

River turns chat into a canvas. Every message is a card, every tangent a branch, every turning point a flag. An agent works alongside you as a cartographer — surfacing angles, drawing connections, marking pivots — so the graph of your thinking becomes something you can see, navigate, and build on. Three background micro-agents (skeptic, assumption-checker, expander) offer fresh lenses each turn; tap one to steer the next reply without typing a word. Persistent per-project agent sessions on Opus 4.7 mean it comes back knowing you.

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Markdown version of https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/147. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt