Open Policy Agent (OPA)
AdvancedCNCF policy engine for unified, context-aware authorization across the cloud-native stack.
Company
Styra / CNCF
Founded
2016
Headquarters
San Francisco, CA
Pricing Range
Free (open-source, Apache 2.0)
Difficulty
advanced
Target Audience
Security and platform teams needing fine-grained, decoupled policy enforcement.
About
Open Policy Agent (OPA) is a CNCF-graduated open-source policy engine that provides unified, context-aware authorization across the entire cloud-native stack. OPA decouples policy decisions from application logic: instead of embedding authorization rules in your code, you write policies in Rego (a declarative, Datalog-inspired language) and OPA evaluates them against real-time data. This separation means policy changes don't require code changes or redeployment. For AI agent systems, OPA is a powerful tool for defining what agents can and cannot do — you can write policies like 'an agent can read files only in /data/agent/', 'an agent can make network requests only to approved domains', or 'an agent must request human approval for any command that modifies production data'. OPA can be deployed as a sidecar container, a library embedded in your Go application, or a standalone service with a REST API. It supports real-time policy updates, decision logging for audit trails, and integration with Kubernetes admission control, Envoy service mesh, and Terraform infrastructure-as-code. For teams building AI agents that interact with sensitive systems, OPA provides the guardrails that turn autonomous agents from a security risk into a controlled, auditable capability.
Advantages
- 1Declarative Rego language
- 2Decoupled from app code
- 3CNCF graduated
- 4Real-time policy updates
- 5Decision audit logs
Pros & Cons
Pros
- +Industry standard for policy
- +Powerful Rego language
- +Large ecosystem
- +Proven at scale
Cons
- −Rego learning curve
- −Performance at high throughput
- −Limited UI without Styra
Use Cases
AI agent access control
Kubernetes admission control
API authorization
Infrastructure policy
Pricing
Open Source
$0
- Full policy engine
- Rego language
- REST API
- Apache 2.0
Styra DAS
Contact sales
- Centralized management
- Decision logging
- Impact analysis
- Team collaboration
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