Open GIMP and navigate to the Procedure Browser. Help->Procedure Browser
It’s home to the full descriptions and expected parameters of the following commands:

Sorted by Frequency of Use

(gimp-message)
(gimp-item-is-group)
(gimp-item-get-name)
(gimp-item-set-lock-content)
(gimp-drawable-get-offsets)
(gimp-layer-get-mask)
(gimp-item-set-name)
(gimp-item-get-children)
(gimp-image-insert-layer)
(gimp-item-get-parent)
(gimp-layer-set-lock-alpha)
(gimp-item-set-visible)
(gimp-item-set-lock-position)
(gimp-item-get-parasite-list)
(gimp-item-set-lock-visibility)
(gimp-image-get-file)
(gimp-image-get-selected-layers)
(gimp-image-get-layers)
(gimp-layer-from-mask)
(gimp-edit-paste)
(gimp-edit-copy)
(gimp-displays-flush)
(gimp-context-push)
(gimp-context-pop)
(gimp-selection-none)
(gimp-item-get-lock-content)
(gimp-selection-bounds)
(gimp-layer-get-lock-alpha)
(gimp-item-get-lock-position)
(gimp-floating-sel-anchor)
(gimp-layer-set-mode)
(gimp-item-get-lock-visibility)
(gimp-drawable-get-width)
(gimp-drawable-get-height)
(gimp-image-undo-group-start)
(gimp-image-undo-group-end)
(gimp-layer-set-opacity)
(gimp-item-set-color-tag)
(gimp-item-id-is-layer-mask)
(gimp-image-get-width)
(gimp-image-get-height)
(gimp-layer-set-offsets)
(gimp-image-remove-layer)
(gimp-image-get-item-position)
(gimp-item-set-expanded)
(gimp-item-get-parasite)
(gimp-item-id-is-valid)
(gimp-item-attach-parasite)
(gimp-context-set-foreground)
(gimp-layer-group-new)
(gimp-image-scale)
(gimp-image-id-is-valid)
(gimp-edit-copy-visible)
(gimp-drawable-curves-spline)
(gimp-layer-resize)
(gimp-item-is-layer-mask)
(gimp-item-get-visible)
(gimp-display-new)
(gimp-image-set-selected-layers)
(gimp-image-set-file)
(gimp-image-reorder-item)
(gimp-image-attach-parasite)
(gimp-get-parasite-list)
(gimp-drawable-offsets)
(gimp-context-set-opacity)
(gimp-layer-create-mask)
(gimp-layer-add-mask)
(gimp-item-detach-parasite)
(gimp-image-get-parasite-list)
(gimp-context-set-interpolation)
(gimp-layer-new)
(gimp-layer-get-opacity)
(gimp-layer-get-mode)
(gimp-item-get-color-tag)
(gimp-get-parasite)
(gimp-get-images)
(gimp-floating-sel-to-layer)
(gimp-edit-paste-as-new-image)
(gimp-drawable-width)
(gimp-drawable-height)
(gimp-drawable-fill)
(gimp-drawable-edit-fill)
(gimp-detach-parasite)
(gimp-attach-parasite)
(gimp-layer-set-show-mask)
(gimp-layer-copy)
(gimp-image-width)
(gimp-image-select-item)
(gimp-image-height)
(gimp-image-get-parasite)
(gimp-image-get-filename)
(gimp-image-get-active-drawable)
(gimp-image-delete)
(gimp-image-clean-all)
(gimp-get-monitor-resolution)
(gimp-drawable-has-alpha)
(gimp-display-id-is-valid)
(gimp-context-set-paint-mode)
(gimp-xcf-save)
(gimp-selection-is-empty)
(gimp-layer-set-apply-mask)
(gimp-layer-scale)
(gimp-layer-resize-to-image-size)
(gimp-layer-new-from-drawable)
(gimp-layer-add-alpha)
(gimp-item-get-expanded)
(gimp-image-thaw-layers)
(gimp-image-get-resolution)
(gimp-image-freeze-layers)
(gimp-drawable-desaturate)
(gimp-display-present)
(gimp-context-set-background)
(gimp-vectors-import-from-file)
(gimp-vectors-export-to-file)
(gimp-selection-all)
(gimp-layer-remove-mask)
(gimp-layer-get-apply-mask)
(gimp-image-set-active-layer)
(gimp-image-select-ellipse)
(gimp-image-resize)
(gimp-image-remove-vectors)
(gimp-image-new-with-precision)
(gimp-image-new)
(gimp-image-merge-down)
(gimp-image-lower-item)
(gimp-image-list)
(gimp-image-is-valid)
(gimp-image-is-dirty)
(gimp-image-get-vectors)
(gimp-image-flatten)
(gimp-file-load)
(gimp-drawable-type)
(gimp-drawable-hue-saturation)
(gimp-drawable-brightness-contrast)
(gimp-display-delete)
(gimp-context-set-gradient)
(gimp-context-set-default-colors)
(gimp-context-set-brush-spacing)
(gimp-context-set-brush-size)
(gimp-context-get-brush)


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