The opencontainers/runtime-tools repository is a command-line application for working with the OCI (Open Container Initiative) runtime specification. It provides two main functionalities: generating OCI runtime spec configuration files (config.json) via the `oci-runtime-tool generate` command, and validating OCI bundles against the runtime specification via the `oci-runtime-tool validate` command. Additionally, it includes a runtime validation suite (`runtimetest`) to test OCI-compliant runtimes (like runC) for specification compliance. The architecture is modular, with separate packages for generation, validation, cgroups handling, path operations, and spec-specific error handling. Built in Go using urfave/cli for command parsing, it supports multiple operating systems (Linux, Windows, Solaris) via build tags and external dependencies on the OCI runtime-spec and other Go libraries. The tool is actively maintained, with recent commits and ongoing alignment with spec updates.