web-shader-extractor (install-on-demand companion)

This is a thin wrapper. The upstream skill has no open license, so motion-anything cannot redistribute its code — it is fetched on demand instead. Everything below is motion-anything's own description; the implementation lives upstream.

What it does

Locks onto a page's rendering surface (WebGL/WebGPU/Canvas), records shader / resource / render-graph / timing / input evidence, builds an evidence-matched local baseline, then projectizes it into a standalone runnable. This is the right tool for the "复杂网页效果 (WebGL / 高斯泼溅)" need that our 2D compositor deliberately does not draw — see WEBGL.md.