Show HN: Loopers – Open-source fail-closed firewall for AI agent runtimes

Category: security

Tags: ai-firewall, agent-security, budget-enforcement

Score: 8.0/10 (Innovation: 7, Technical: 9, Documentation: 8, Utility: 8)

Loopers is a high-performance, fail-closed firewall for AI agent runtimes that intercepts requests across 500+ AI models and MCP tool calls to prevent token overspending and runaway agent loops. Written in Go with sub-millisecond latency and zero-storage pass-through architecture, it combines features like atomic Lua-based budget enforcement, Rego policy engine, agent identity tracking, and framework adapters for CrewAI and AutoGen. Its innovative combination of deterministic loop detection, blast radius limits, and real-time streaming cutoffs addresses a critical gap in AI infrastructure security.

Target audience: backend devs, devops, AI engineers

Repository: https://github.com/CURSED-ME/loopers-oss · Go · MIT · 53 stars

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