SpaceXAI Open-Sources Grok Build: The Rust Agent Harness, TUI, and Tool Layer Behind Its Coding CLI
Summary
<p>SpaceXAI published the Grok Build source on July 15, 2026. The Apache 2.0 Rust tree covers the agent loop, tool dispatch, the TUI, and the extension system. Grok 4.5 stays closed, and external contributions are not accepted.</p> <p>The post <a href="https://www.marktechpost.com/2026/07/15/spacexai-open-sources-grok-build-the-rust-agent-harness-tui-and-tool-layer-behind-its-coding-cli/">SpaceXAI Open-Sources Grok Build: The Rust Agent Harness, TUI, and Tool Layer Behind Its Coding CLI</a> appeared first on <a href="https://www.marktechpost.com">MarkTechPost</a>.</p>
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Grok Build is now open source https://t.co/LbGepmRB3l
— Elon Musk (@elonmusk) July 15, 2026
We've open-sourced Grok Build and have reset usage limits for all users.
— SpaceXAI (@SpaceXAI) July 15, 2026
Open sourcing Grok Build allows anyone to support making a reliable and robust harness. Check out our code, including the Git repo for the Grok Build CLI. https://t.co/3SSvPu2Nrz
SpaceXAI was caught uploading your code to its cloud.
— Hari (@hrkrshnn) July 13, 2026
I reversed xAI's official Grok Build binary. In a controlled session with zero tool-calls, it uploaded the complete codebase to xAI's storage
It ships a malware-like background code collector. https://t.co/1AjmmjiJjU