Health and context for Capture One: whether it is running, whether Apple Events are actually getting through, the reported app version, the open document, and which write tiers are enabled. Call this first when anything else times out.

List the Capture One sessions and catalogs that are currently open, and which one is frontmost.

Detailed settings for the current document: kind (session or catalog), paths, session folders, naming/token formats, counters, current collection and recipe, and processing queue depth.

List the collections in the current document: albums, projects, groups, smart albums, catalog folders and session favorites.

Focus a collection in the Capture One browser by name or id. Changes only what is displayed; no image data is touched.

List variants (the editable instances of images) with filtering and pagination. This is the main way to find images. Filter by rating, color tag, pick flag, filename or extension; request extra field groups only when needed, since those cost a round trip per variant.

Everything scriptable about one variant: source image and EXIF, all adjustment values, crop, lens correction, IPTC metadata, keywords, layers, and previously written output files.

List the output recipes in the current document, with format and enabled state.

Full settings for one output recipe: file format and quality, scaling, output sharpening, destination and naming, metadata inclusion, crop handling and watermark.

Names of the styles and presets available in Capture One. The scripting interface exposes names only, not their contents.

Keywords defined in the current document.

Change which variants are selected in Capture One. Selection is view state — no image data, metadata or library structure is modified. Useful to stage a set for the user to look at, or to set up a subsequent selection-scoped call.

List every writable adjustment property with its type, valid range and any quirks. Ranges were recovered by probing the live app — the scripting dictionary declares none. Call this before co_adjust_variants to get exact parameter names and limits.

List the layers on variants, with kind, enabled state, opacity and luma-range settings. Layers have no id and are addressed by index; index 0 is always the background layer.

List every writable recipe property with its type and allowed values, for use with co_configure_recipe.

Current depth of the processing queue, and the jobs still pending.

Files previously written for variants, from Capture One's output history, including whether each file still exists on disk.

Compare readable settings of source and candidate variants from the same image in the expected document. Reports differences and unavailable fields, plus IDs for keeping the candidate or returning to the source. Mask contents, curves and luma ranges are outside comparison coverage.