| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| github.com/open-policy-agent/opa/v1/ast | Package ast declares Rego syntax tree types and also includes a parser and compiler for preparing policies for execution in the policy engine. |
| github.com/open-policy-agent/opa/v1/metrics | Package metrics contains helpers for performance metric management inside the policy engine. |
| github.com/open-policy-agent/opa/v1/topdown/builtins | Package builtins contains utilities for implementing built-in functions. |
| github.com/open-policy-agent/opa/v1/topdown/cache | Package cache defines the inter-query cache interface that can cache data across queries |
| github.com/open-policy-agent/opa/v1/topdown/print | |
| io | Package io provides basic interfaces to I/O primitives. |
| time | Package time provides functionality for measuring and displaying time. |