Open Policy Agent

Open Policy Agent (OPA) is an open-source, general-purpose policy engine that unifies policy enforcement across the cloud-native stack, enabling the practice of "policy-as-code." It decouples policy decision-making from application logic by providing a central service that other systems—such as microservices, Kubernetes, or CI/CD pipelines—can query to offload complex authorization decisions. Using its declarative language, Rego, developers and operators can write fine-grained, context-aware policies to enforce security, compliance, and operational guardrails consistently throughout their entire technology landscape.