`sprite`

Places a free prop (image, rect, or polygon) on a stage layer. JSON / Mode B only (no script sugar).

{
  "type": "sprite",
  "id": "chair",
  "value": "chair",
  "layer": "bg_front",
  "x": 625,
  "y": 494
}

Usually you need

Field	Type	Default	Effect
`id`	string	—	Named sprite
`value`	string or `null`	—	Asset name; `null` hides
`layer`	`"bg_front"` \| `"fg"` \| `"overlay"`	`"overlay"`	Draw band
`x` / `y`	number	—	Position

Field	Type	Default	Effect
`id`	string	—	Named id
`layer`	enum	`"overlay"`	Plane band
`kind`	`"image"` \| `"rect"` \| `"polygon"` \| `"model"`	`"image"`	Shape (`model` is in development)
`value`	string or `null`	—	Asset / hide
`x` / `y` / `width` / `height` / `order`	number	—	Geometry
`offset`	number or array	—	Additive px
`rotation_degrees`	number	—	Angle
`color` / `corner_radius` / `points`	…	—	Primitives
`opacity`	0–1	`1.0`	Alpha
`modulate` / `scale`	color / number or `[sx,sy]`	—	Tint / scale
`transition` / `transition_in` / `transition_out`	kind	`"instant"`	Show/hide
`transition_duration` / `duration`	number ≥ 0	`0` (fade often 0.5 in comments)	Seconds
`sfx`	string	—	Loop until hide
`shader`	object or `null`	—	Shader; uniforms go in the object’s `params` (a top-level `shader_params` is not a sprite field)
`bind` / `interaction` / `state_visual` / `layout`	object	—	Live / hooks / states / host
`clear`	layer name or `"all"`	—	Clear sprites
`when`	expression	—	Skip when falsy