Grok Build is Now Open Source

xAI has made Grok Build, its coding agent and terminal user interface (TUI), open source by publishing the full source code on GitHub. This release allows developers to examine how Grok Build assembles context, parses model responses, and dispatches tool calls. The source code also details how the agent reads, edits, and searches code, runs commands, and manages the terminal UI including rendering, input handling, and inline diff viewing. Additionally, the extension system is included, covering skills, plugins, hooks, MCP servers, and subagents, providing a comprehensive reference for loading and invoking these components. By open-sourcing Grok Build, xAI enables users to explore, modify, and extend the harness. Furthermore, Grok Build can now be run fully local-first, allowing users to compile the code themselves, connect it to local inference engines, and control operations through a configuration file named config.toml. This approach supports greater flexibility and privacy for developers working with the tool.