I built two new tools to help coding agents demonstrate their work beyond just running automated tests: Showboat and Rodney https://simonwillison.net/2026/Feb/10/showboat-and-rodney/
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@simon Nice! I’ve recently had success with agents building a marimo notebook, which seems similar to Showboat. It’s lightweight, really just some python code, and can show the output of commands/tables/charts.
@simon Rodney feels similar to the Vibium CLI here: https://github.com/VibiumDev/vibium