A reflex security layer for autonomous AI agents.

Brack is a security layer designed to protect autonomous AI agents from prompt injection attacks and malicious instructions. It acts as a fast, early-stage filter positioned between user input and the agent's execution. The system employs a regex-first approach for initial prompt triage, followed by a lightweight intent check using a Gemma3 270M model to detect harmful content. It includes salted HMAC logging for audit trails and input hygiene mechanisms. This solution is built for developers and organizations deploying AI agents who need a lightweight, cost-effective security measure to intercept attacks before they reach the primary LLM, preventing unauthorized actions and data exfiltration.