xAI launched Grok Build yesterday — their answer to Claude Code and Codex CLI. The install command is one line, the binary is gated behind their top consumer tier ($299/mo, $99 intro), and the agent itself talks to Grok 4 through an OpenAI-compatible HTTP surface. I downloaded the binary because I was curious what language it was built in. I came out the other end with thirty-odd verbatim system prompts, the names of every internal subagent, every tool description, and a fairly complete pictu...

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