FuseGuard — Circuit Breaker for AI Agents
Problem: AI agents can run away and burn thousands in API spend before anyone notices; dashboards show spend but don't stop it.
Approach: Built a drop-in proxy that enforces token/$ budgets at runtime on Cloudflare Workers + Durable Objects — reserves worst-case cost pre-flight, reconciles after, kills runaway loops. Open-core: MIT proxy + hosted Next.js dashboard, Supabase (RLS), Lemon Squeezy billing, full CI/CD.
Shipped end-to-end and deployed to production; 168 tests, two Opus-grade security audits, fail-closed budget enforcement with no race conditions.
- Cloudflare Workers
- Durable Objects
- Next.js
- Supabase
- TypeScript