Google Slides authoring

Coordinates are POINTS from the slide's top-left; a standard slide is 720x405 (read_slide_layout reports the real size). Everything is addressed by objectId from read_presentation. Pass requiredRevisionId from the latest read or write so a concurrent edit fails the write instead of corrupting it.

Building a new deck: compose, then look

Write each slide as a layout, not as coordinates. compose_slide takes a tree (stacks, grids, cards, text, images) or an HTML/CSS subset and lays the whole slide out in one call: equal peer sizes, even gutters, vertical centering, and contrast pairs hold by construction, text can fit: "shrink", and the reply carries every element's box plus lints on the plan. Per slide: