# toolang > Agent language, runtime, and CLI. ## Docs - [Probe](/_probe) - [CLI](/cli): The `toolang` command is the main user interface for the runtime. - [Getting Started](/getting-started): Toolang is an agent-oriented system with three layers: - [Implementation Choices](/implementation-choices): Toolang v1 is intentionally small and local-first. - [Language](/language): Toolang source files use the `.too` extension. - [Runtime Design](/runtime-design): The Toolang runtime is built around the idea of a **home**.