Grok Build is Now Open Source

We're open-sourcing Grok Build, SpaceXAI's coding agent and TUI. The source is now available on GitHub.

Publishing the code is the most direct way to build toward a robust and reliable harness. You can read the source to see exactly how it works, from context assembly to tool-call dispatch.

Open-sourcing also makes the harness easier to explore and extend: if you're working with skills, plugins, hooks, MCP servers, or subagents, the source is the definitive reference for how each is loaded and invoked.

Finally, Grok Build can now run fully local-first: compile it yourself, point it at your own local inference, and drive everything from your config.toml.

About the codebase

The published source includes:

• The agent loop: how context is assembled, how model responses are parsed, and how tool calls are dispatched
• The tools: how the agent reads, edits, and searches code, and how it runs commands
• The terminal UI: rendering, input handling, plan review, and the inline diff viewer
• The extension system: skills, plugins, hooks, MCP servers, and subagents

Explore the source on GitHub.