Grok Build

xAI open-sourced its Grok Build coding agent (Apache 2.0; 19.7K★) — a ~844K-line Rust agent (agent loop, tools, TUI, skills/plugins/hooks, MCP support) that self-compiles and can run against local inference. xAI's entry into the open agent-harness field alongside its Grok 4.5 flagship.