# Watt Mind

- **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:** [Laszlo Racz](https://cerebralvalley.ai/u/hdkiller)
- **GitHub:** https://github.com/watt-mind/pii-guard
- **Demo video:** https://youtu.be/VrY8x3h26ws
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/688

PII Guard is an OpenAI-compatible privacy gateway for existing AI agents. It sits between the agent and its answering model, replaces detected personal data in text and images with session-consistent placeholders, and puts the real values back into streamed answers and tool-call arguments on the user's side. The agent keeps the relationships between people and documents; the model never needs the original names, emails, IDs or faces.

Developers point any OpenAI-compatible client at the gateway with one command (pip install wattmind-pii-guard, then pii-guard up) and can inspect every masked outbound request in a local console. Text is masked on the user's machine by a small XLM-RoBERTa CPU model (43 ms p50 for the model alone) trained on Meta Muse Glimmer labels and public data. On 990 synthetic agent-traffic documents it left 0.21% of labeled values visible and over-masked 0.74%. Images such as ID cards get labelled masks for text, faces and signatures, linked to the same person placeholder as the text.

We publish the evaluation records, protocol and regressions, not just the wins: detection can miss values, and reversible placeholders are not anonymization. Apache-2.0. Try it as a guest with no install or account at https://guard.watt-mind.com

## More from Meta Global AI Developer Hackathon

- [StarAI](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/685)
- [Second Me](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/686)
- [Saatchi](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/687)
- [Kewlkid](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/689)
- [KUL](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/690)
- [TripKode](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/691)

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Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/688. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt