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I poked around in the just open sourced Grok Build CLI tool - 844,000 lines of Rust code! - and dug up a few interesting highlights, including a "self-contained terminal renderer for Mermaid diagrams" that renders them using Unicode box-art! simonwillison.net/2026/Jul/15/...

simonwillison.netxai-org/grok-build, now open sourcexAI's grok CLI tool faced severe community backlash yesterday when it became apparent that running the command in a directory could upload that entire directory to xAI's Google Cloud buckets. …

Simon Willison

@simonwillison.net

I couldn't resist extracting that Rust Mermaid rendering code out and compiling it to WebAssembly so you can try it out directly in a browser tools.simonwillison.net/grok-mermaid

16/7/26, 12:45 am2 reposts53 likes

Yu Wang

@wybaby168.bsky.social

16 July

This is the good kind of WASM demo: zero install, no server, and the output is still plain text. Did CJK or emoji labels break the box alignment? Unicode width rules are awful once browser fonts get involved.