Creates a MOTION COMPOSITION — an animated graphic (infographic, title, promo end-card, chart…) written as a React TSX component. Read the 'motion' skill (read_skill {topic:'motion'}) for the exact API surface, available fonts/icons and golden examples before writing one. files maps file names to TSX source; the entry must export default the component. schema declares the editable props (type string|number|color|boolean|select|mediaRef + default) — they become Inspector controls the user can tweak, so parameterize colors, copy and media slots. The composition is compiled and test-rendered BEFORE saving; on failure the error returns verbatim — fix the code and retry. Returns the mediaRef to place with add_clips. Unless asked for plain, aim well beyond a PowerPoint of titles and bullets — the story, its moments and the look are yours to decide. With UI-like parts (buttons, pills, progress bars, cards), write them in their own file with a partsBoard prop (default false) and look at the board first: preview:true, previewProps:{partsBoard:true} returns one large frame with the reply.