SpaceXAI Open-Sources Grok Build: The Rust Agent Harness, TUI, and Tool Layer Behind Its Coding CLI

SpaceXAI has released the source code for its Grok Build framework under the Apache 2.0 license, providing developers access to its Rust-based agent loop, terminal user interface, and tool dispatch system. While the company is not accepting external contributions and continues to keep its core Grok 4.5 model proprietary, the release allows developers to study and utilize the underlying infrastructure used to build the company's internal coding command-line interface.