Title: Cyber Security Evaluator: MITRE-Aligned Adaptive Security Benchmarking Abstract: The Cyber Security Evaluator is a Green Agent that identifies and evaluates specific MITRE ATT&CK techniques to benchmark "Purple Agent" security detectors. It employs an adaptive 7-agent ecosystem—including Thompson Sampling for testing strategy and Novelty Search for evasion discovery—to generate evolving attack campaigns. Focusing on techniques like SQL Injection and Prompt Injection (LLM Jailbreaks), evaluations are conducted within a secure Docker sandbox. The agent provides distinct MITRE coverage mapping and performance metrics, helping developers validate their angebts against recognized adversary behaviors and real-world threats.