I made an open source kit that helps Claude make explainer videos

Everyone is doing those Opus 5 videos now. explainroo gives Claude a head start: point Claude Code at the repo, say what the video should explain, and you get a narrated MP4. Scenes are plain JS on an HTML canvas, voice and timing run on your computer. Sonnet 5.5 is good at it too, so it gets cheaper. How Claude helped: I built explainroo with Claude Code. Claude wrote most of the engine, the UI kit for product demos and the docs. The example videos, including this unofficial Claude demo, were made by Claude agents working only from the repo's http://AGENTS.md, and what they got stuck on went back into the docs. Free and MIT licensed: https://github.com/vincentsch/explainroo