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xAI Open-Sources Grok Build, Its Terminal-Based AI Coding Agent

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xAI has released Grok Build as open source, making the full codebase of its terminal-based AI coding agent publicly available on GitHub. Written in Rust, the repository includes the agent loop, file editing and search tools, a full-screen terminal UI, and an extension system supporting plugins, hooks, and subagents. The release allows developers to inspect how the system assembles context, dispatches tool calls, handles errors, and manages long-running tasks — components that determine an agent's reliability beyond the underlying model. Prebuilt installers are available for macOS, Linux, and Windows, and the agent can be configured to run against local inference via a config file. xAI notes that open-sourcing the harness does not grant free access to hosted models, as code, model access, and usage costs remain separate.

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