Member Junction
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    WhiteboardWidgetToolArgs:
        | { ItemID: string; Op: "inspect" }
        | { ItemID: string; Op: "operate"; Steps: WhiteboardWidgetStep[] }
        | {
            Action: string;
            ItemID: string;
            Op: "call";
            Payload: WhiteboardToolJSONValue;
        }

    The parsed, validated arguments of one widget tool call.