# Sentinel Robot Safety

- **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:** [Rushikesh Bhosale](https://cerebralvalley.ai/u/rushikesh84)
- **GitHub:** https://github.com/rushibhosalepro/sentinel
- **Demo video:** https://www.youtube.com/watch?v=QiI9FRH5ySk
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1357

Sentinel is a safety layer between an LLM planner and a robot arm. LLMs plan robot actions well, but they can't judge safety: asked to pass a knife, Muse Spark hands it blade-first; asked to pour water, it pours beside a laptop; a sticky note in the room can hijack it.

Sentinel dry-runs every plan in a MuJoCo simulation, then checks the full motion with deterministic rules (no LLM inside the check, ~20-50 ms). It returns ALLOW, ASK, BLOCK or HALT with a "why" and measured values. Fixable problems go back to the planner as a concrete fix ("move the cup away from the laptop"), and the model replans, up to 3 rounds. Text read from the scene is quarantined as data, never as instructions. Owners can report a miss, and Muse Wonder proposes one new rule that must pass a 4-stage gate before it is used.

Benchmark (128 scenarios x 3 repeats): unsafe actions executed fall from 60.4% (LLM alone) to 18.8% with the Sentinel loop, while safe tasks still succeed 82% vs 83%. Simulation only; 18.8% still unsafe, documented in the README.

Everything shown was built during the hackathon (Oct 27 - Nov 4), solo, with Muse Code: the MuJoCo sim, perception, scene graph, checker, replan loop, rule learner, benchmark, dashboard, live deploy and the demo video. The public commit history records the build.

## More from Meta Global AI Developer Hackathon

- [Mina Bebawy (public name: Wyndham Heaven)](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1354)
- [Seam Team](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1355)
- [SpiderLily](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1356)
- [Anas](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1358)
- [oll4.com](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1359)
- [Cascade Development Group](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1360)

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Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1357. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt