🛡️ How I Built Trifecta Checker to Stop Lethal AI Agents with One API Call

Trifecta Checker - Lethal Trifecta Safety Gate Built for Meta Global AI Hackathon Japan 2026 🇯🇵 by altima261 🔗 Live Demo: https://trifecta-checker.vercel.app/ 🔗 GitHub: https://github.com/altima261/trifecta-checker 🔗 API: https://trifecta-checker.vercel.app/api/check-trifecta The Problem: The Lethal Trifecta Coined by Simon Willison, an AI agent becomes a data-theft tool when it has ALL THREE: Private Data Access - inbox, DB, docs Untrusted Content - web pages, emails, file uploads External Communication - HTTP calls, emails, webhooks If an agent has all three, prompt injection = data theft. My Solution: Safety Gate One API call blocks execution BEFORE it runs. bash curl -X POST https://trifecta-checker.vercel.app/api/check-trifecta \ -H "Content-Type: application/json" \ -d '{"tools":["read_gmail","browse_web","send_email"]}' Enter fullscreen mode Exit fullscreen mode