Video2dsprite (Grok Build only)

Convert a base 2D character image into dense animation sprites using Grok Build's native video tools.

base still → image_to_video (in-place motion) → extract frames → chroma key → sample/normalize → strip / grid / GIF

Platform gate (read first)

Runtime	Supported?
Grok Build (xAI)	Yes — requires `image_gen` / `image_edit` + `image_to_video` (or `reference_to_video`)
Codex / Claude / other agents	No — they lack Grok video tools. Tell the user this skill is Grok Build only and offer `$generate2dsprite` instead

If image_to_video is missing from the tool list, stop and explain. Do not fake motion with code-drawn frames.

This skill is an optional denser-motion path. It does not replace $generate2dsprite: