Asset fields

Field	Type/default	Meaning
prompt	string, required unless mirror	The subject wording wrapped by the selected style's prompt prefix and suffix.
width / height	integer 16–8192	Per-asset dimensions for generators that accept rectangular output. Provider limits may be lower.
size	integer 16–8192	Per-asset square size where the generator uses one dimension.
file	string	Output path below the style's outDir; defaults to <category>/<assetId>.png.
category	string	Optional output subdirectory and logical grouping.
source	string	Manifest-relative committed art used instead of generation. For a set of PNG outputs (a frames animation, a tiles set) a path that is not a file is the stem of a hand edit laid beside the generated members (<stem>-<role>.png each); the set still generates. Mutually exclusive with revision.
sourceByStyle	object	Per-style source, keyed by style id; wins over source for that style. Written by pixelkiln edit for a hand edit of an asset that is in several styles.
remoteId	string	The provider's own id for art that already exists on the account, so adopt maps it without matching bytes: an object id, a character id, or <character id>#<animation group id>. Not part of the spec's identity.
revision	object	Controlled image-to-image or inpaint dependency. See controlled revisions.
state	object	character styles: a pose or outfit of another character asset. See Characters.
animation	object	character styles: a loop of another character asset in one direction. See Characters.
mirror	string	Another asset of the same style flipped left to right, made locally at no cost. See Mirrors.
proportions	preset or object	character styles: this base's proportions, over the style's.
reference	string or object	character styles, bases: the character's own south-facing sprite (or { "south": ..., "east": ... }), which PixelLab rotates instead of drawing from the prompt. See Characters.
concept	string	character styles, pro bases: a manifest-relative concept image (up to 1024px) the design is seeded from.
styleCharacter	string	character styles, pro bases: this base's style anchor, over the style's.
providerInputs	JSON scalar/sequence map, {}	Named per-asset inputs consumed by the active provider. ComfyUI accepts scalars and, for frames, one ordered 2–64 value sequence. Image bindings upload PNG/JPEG inputs.
styles	string array, []	Restrict the asset to named styles; empty means every style.
promptByStyle	string map, {}	Replace only the asset prompt for a named style.
cell	[column,row]	The grid cell this asset owns in a mounted sheet; see stable-cell mounting.
outputRole	string	Select one structural output when a generator returns a set.
tags	string array, []	Asset tags added to provider objects where supported.

providerInputs is provider-owned and participates in generation identity. Changing a value makes only that asset stale. A provider may replace a local runtime path with a content hash before hashing the spec; unsupported providers reject non-empty inputs rather than ignoring them. Only a provider that declares a sequence contract may accept an array. ComfyUI uses the array named by providerOptions.comfyui.frames.vary; other inputs stay constant across the set.