Добавьте файлы проекта.

YandexMusic.API/Requests/Playlist/YGetPlaylistByUuidBuilder.cs

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+using System.Net;
+
+using YandexMusic.API.Common;
+using YandexMusic.API.Models.Common;
+using YandexMusic.API.Models.Playlist;
+using YandexMusic.API.Requests.Common;
+using YandexMusic.API.Requests.Common.Attributes;
+
+namespace YandexMusic.API.Requests.Playlist
+{
+    [YApiRequest(WebRequestMethods.Http.Get, "playlist/{uuid}")]
+    public class YGetPlaylistByUuidBuilder : YRequestBuilder<YResponse<YPlaylist>, string>
+    {
+        public YGetPlaylistByUuidBuilder(YandexMusicApi yandex, AuthStorage auth) : base(yandex, auth)
+        {
+        }
+
+        protected override Dictionary<string, string> GetSubstitutions(string uuid)
+        {
+            return new Dictionary<string, string> {
+                { "uuid", uuid },
+            };
+        }
+    }
+}