Initial commit

skills/assets/unity-package/Runtime/Protocol/JsonRpcError.cs

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+using System;
+using Newtonsoft.Json;
+
+namespace UnityEditorToolkit.Protocol
+{
+    /// <summary>
+    /// JSON-RPC 2.0 Error object
+    /// </summary>
+    [Serializable]
+    public class JsonRpcError
+    {
+        [JsonProperty("code")]
+        public int Code { get; set; }
+
+        [JsonProperty("message")]
+        public string Message { get; set; }
+
+        [JsonProperty("data", NullValueHandling = NullValueHandling.Ignore)]
+        public object Data { get; set; }
+
+        public JsonRpcError() { }
+
+        public JsonRpcError(int code, string message, object data = null)
+        {
+            Code = code;
+            Message = message;
+            Data = data;
+        }
+
+        // Standard JSON-RPC 2.0 error codes
+        public static readonly int PARSE_ERROR = -32700;
+        public static readonly int INVALID_REQUEST = -32600;
+        public static readonly int METHOD_NOT_FOUND = -32601;
+        public static readonly int INVALID_PARAMS = -32602;
+        public static readonly int INTERNAL_ERROR = -32603;
+
+        // Custom Unity error codes
+        public static readonly int UNITY_NOT_CONNECTED = -32000;
+        public static readonly int UNITY_COMMAND_FAILED = -32001;
+        public static readonly int UNITY_OBJECT_NOT_FOUND = -32002;
+        public static readonly int UNITY_SCENE_NOT_FOUND = -32003;
+        public static readonly int UNITY_COMPONENT_NOT_FOUND = -32004;
+
+        // Factory methods for common errors
+        public static JsonRpcError ParseError(string details = null)
+        {
+            return new JsonRpcError(PARSE_ERROR, "Parse error", details);
+        }
+
+        public static JsonRpcError InvalidRequest(string details = null)
+        {
+            return new JsonRpcError(INVALID_REQUEST, "Invalid Request", details);
+        }
+
+        public static JsonRpcError MethodNotFound(string method)
+        {
+            return new JsonRpcError(METHOD_NOT_FOUND, $"Method not found: {method}");
+        }
+
+        public static JsonRpcError InvalidParams(string details)
+        {
+            return new JsonRpcError(INVALID_PARAMS, "Invalid params", details);
+        }
+
+        public static JsonRpcError InternalError(string details)
+        {
+            return new JsonRpcError(INTERNAL_ERROR, "Internal error", details);
+        }
+
+        public static JsonRpcError ObjectNotFound(string objectName)
+        {
+            return new JsonRpcError(UNITY_OBJECT_NOT_FOUND, $"GameObject not found: {objectName}");
+        }
+
+        public static JsonRpcError SceneNotFound(string sceneName)
+        {
+            return new JsonRpcError(UNITY_SCENE_NOT_FOUND, $"Scene not found: {sceneName}");
+        }
+
+        public static JsonRpcError CommandFailed(string details)
+        {
+            return new JsonRpcError(UNITY_COMMAND_FAILED, "Command failed", details);
+        }
+    }
+}

skills/assets/unity-package/Runtime/Protocol/JsonRpcError.cs.meta

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+fileFormatVersion: 2
+guid: 6c34766799e11684ca74b00411016acb

skills/assets/unity-package/Runtime/Protocol/JsonRpcRequest.cs

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+using System;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace UnityEditorToolkit.Protocol
+{
+    /// <summary>
+    /// JSON-RPC 2.0 Request
+    /// </summary>
+    [Serializable]
+    public class JsonRpcRequest
+    {
+        [JsonProperty("jsonrpc")]
+        public string JsonRpc { get; set; } = "2.0";
+
+        [JsonProperty("id")]
+        public object Id { get; set; }
+
+        [JsonProperty("method")]
+        public string Method { get; set; }
+
+        [JsonProperty("params")]
+        public JToken Params { get; set; }
+
+        /// <summary>
+        /// Get strongly-typed parameters (✅ 에러 처리 개선)
+        /// </summary>
+        public T GetParams<T>() where T : class
+        {
+            if (Params == null || Params.Type == JTokenType.Null)
+            {
+                return null;
+            }
+
+            try
+            {
+                return Params.ToObject<T>();
+            }
+            catch (Newtonsoft.Json.JsonException ex)
+            {
+                // JSON 역직렬화 실패 시 예외를 다시 던져서 호출자가 처리하도록
+                UnityEngine.Debug.LogError($"Failed to deserialize params to {typeof(T).Name}: {ex.Message}");
+                throw new ArgumentException($"Invalid parameter format for {typeof(T).Name}: {ex.Message}", ex);
+            }
+            catch (Exception ex)
+            {
+                // 기타 예외도 동일하게 처리
+                UnityEngine.Debug.LogError($"Unexpected error deserializing params: {ex.Message}");
+                throw new ArgumentException($"Failed to deserialize parameters: {ex.Message}", ex);
+            }
+        }
+
+        /// <summary>
+        /// Check if request is valid
+        /// </summary>
+        public bool IsValid()
+        {
+            return JsonRpc == "2.0" && !string.IsNullOrEmpty(Method);
+        }
+
+        /// <summary>
+        /// Serialize request to JSON string
+        /// </summary>
+        public string ToJson()
+        {
+            return JsonConvert.SerializeObject(this, Formatting.None, new JsonSerializerSettings
+            {
+                NullValueHandling = NullValueHandling.Ignore
+            });
+        }
+
+        /// <summary>
+        /// Deserialize JSON string to request object
+        /// </summary>
+        public static JsonRpcRequest FromJson(string json)
+        {
+            return JsonConvert.DeserializeObject<JsonRpcRequest>(json);
+        }
+    }
+}

skills/assets/unity-package/Runtime/Protocol/JsonRpcRequest.cs.meta

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+fileFormatVersion: 2
+guid: 840ef3c5f8e0d8241ba5a475dbf83da0

skills/assets/unity-package/Runtime/Protocol/JsonRpcResponse.cs

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+using System;
+using Newtonsoft.Json;
+
+namespace UnityEditorToolkit.Protocol
+{
+    /// <summary>
+    /// JSON-RPC 2.0 Success Response
+    /// </summary>
+    [Serializable]
+    public class JsonRpcResponse
+    {
+        [JsonProperty("jsonrpc")]
+        public string JsonRpc { get; set; } = "2.0";
+
+        [JsonProperty("id")]
+        public object Id { get; set; }
+
+        [JsonProperty("result")]
+        public object Result { get; set; }
+
+        public JsonRpcResponse() { }
+
+        public JsonRpcResponse(object id, object result)
+        {
+            Id = id;
+            Result = result;
+        }
+
+        public string ToJson()
+        {
+            return JsonConvert.SerializeObject(this, Formatting.None, new JsonSerializerSettings
+            {
+                NullValueHandling = NullValueHandling.Ignore
+            });
+        }
+    }
+
+    /// <summary>
+    /// JSON-RPC 2.0 Error Response
+    /// </summary>
+    [Serializable]
+    public class JsonRpcErrorResponse
+    {
+        [JsonProperty("jsonrpc")]
+        public string JsonRpc { get; set; } = "2.0";
+
+        [JsonProperty("id")]
+        public object Id { get; set; }
+
+        [JsonProperty("error")]
+        public JsonRpcError Error { get; set; }
+
+        public JsonRpcErrorResponse() { }
+
+        public JsonRpcErrorResponse(object id, JsonRpcError error)
+        {
+            Id = id;
+            Error = error;
+        }
+
+        public string ToJson()
+        {
+            return JsonConvert.SerializeObject(this, Formatting.None);
+        }
+    }
+}

skills/assets/unity-package/Runtime/Protocol/JsonRpcResponse.cs.meta

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+fileFormatVersion: 2
+guid: a9b7796e1d31f1944a4925d7deb2c5b0