diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 4f9167d..2c4a54f 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -1,8 +1,9 @@
 {
-  "enableAllProjectMcpServers": false,
   "permissions": {
     "allow": [
-      "Bash(find:*)"
+      "Bash(find:*)",
+      "Bash(dotnet test:*)"
     ]
-  }
+  },
+  "enableAllProjectMcpServers": false
 }
\ No newline at end of file
diff --git a/CommandForgeGenerator.Tests/GenerateSampleTextCommand.cs b/CommandForgeGenerator.Tests/GenerateSampleTextCommand.cs
new file mode 100644
index 0000000..c705e59
--- /dev/null
+++ b/CommandForgeGenerator.Tests/GenerateSampleTextCommand.cs
@@ -0,0 +1,36 @@
+#if ENABLE_COMMAND_FORGE_GENERATOR
+namespace CommandForgeGenerator.Command
+{
+    public partial class TextCommand : ICommandForgeCommand
+    {
+        public const string Type = "text";
+        public readonly CommandId CommandId;
+        
+        public readonly string Character;
+        public readonly string? Body;
+        public readonly string? VoiceId;
+        
+  
+        public static TextCommand Create(int commandId, global::Newtonsoft.Json.Linq.JToken json)
+        {
+            
+            var Character = (string)json["character"];
+            var Body = json["body"] == null ? null : (string)json["body"];
+            var VoiceId = json["voiceId"] == null ? null : (string)json["voiceId"];
+            
+            
+            return new TextCommand(commandId, Character, Body, VoiceId);
+        }
+        
+        public TextCommand(int commandId, string Character, string? Body, string? VoiceId)
+        {
+            CommandId = (CommandId)commandId;
+            
+        this.Character = Character;
+        this.Body = Body;
+        this.VoiceId = VoiceId;
+        
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/CommandForgeGenerator.Tests/GenerateSampleUtl.cs b/CommandForgeGenerator.Tests/GenerateSampleUtl.cs
new file mode 100644
index 0000000..af68e7d
--- /dev/null
+++ b/CommandForgeGenerator.Tests/GenerateSampleUtl.cs
@@ -0,0 +1,6 @@
+namespace CommandForgeGenerator.Command;
+
+// 他の生成結果サンプルコマンドをコンパイルエラーにしないためのコード
+
+public interface ICommandForgeCommand { }
+public enum CommandId{}
\ No newline at end of file
diff --git a/CommandForgeGenerator.Tests/GenerateTestCode.cs b/CommandForgeGenerator.Tests/GenerateTestCode.cs
index d0e1db9..251b58c 100644
--- a/CommandForgeGenerator.Tests/GenerateTestCode.cs
+++ b/CommandForgeGenerator.Tests/GenerateTestCode.cs
@@ -1,40 +1,9 @@
+using System.IO;
+
 namespace CommandForgeGenerator.Tests;
 
 public class GenerateTestCode
 {
-    public const string TextCommand = """
-                                      #if ENABLE_COMMAND_FORGE_GENERATOR
-                                      namespace CommandForgeGenerator.Command
-                                      {
-                                          public partial class TextCommand : ICommandForgeCommand
-                                          {
-                                              public const string Type = "text";
-                                              public readonly CommandId CommandId;
-                                              
-                                              public readonly string Character;
-                                              public readonly string Body;
-                                              
-                                        
-                                              public static TextCommand Create(int commandId, global::Newtonsoft.Json.Linq.JToken json)
-                                              {
-                                                  
-                                                  var Character = (string)json["character"];
-                                                  var Body = (string)json["body"];
-                                                  
-                                                  
-                                                  return new TextCommand(commandId, Character, Body);
-                                              }
-                                              
-                                              public TextCommand(int commandId, string Character, string Body)
-                                              {
-                                                  CommandId = (CommandId)commandId;
-                                                  
-                                              this.Character = Character;
-                                              this.Body = Body;
-                                              
-                                              }
-                                          }
-                                      }
-                                      #endif
-                                      """;
+    // プロジェクトファイルに存在する GenerateSampleTextCommand.cs を取得する
+    public static string TextCommandStr => File.ReadAllText("../../../GenerateSampleTextCommand.cs");
 }
\ No newline at end of file
diff --git a/CommandForgeGenerator.Tests/Test.cs b/CommandForgeGenerator.Tests/Test.cs
index 2d2ba98..590556a 100644
--- a/CommandForgeGenerator.Tests/Test.cs
+++ b/CommandForgeGenerator.Tests/Test.cs
@@ -65,7 +65,7 @@ public void GenerateTest()
         var codeFiles = CodeGenerator.Generate(commandsSchema);
         
         Assert.Equal(16, codeFiles.Count);
-        Assert.Equal(GenerateTestCode.TextCommand, codeFiles.FirstOrDefault(c => c.FileName == "TextCommand.g.cs").Code);
+        Assert.Equal(GenerateTestCode.TextCommandStr, codeFiles.FirstOrDefault(c => c.FileName == "TextCommand.g.cs").Code);
         
         #region Internal
         
@@ -86,6 +86,10 @@ string GetSampleYaml()
                          body:
                            type: string
                            multiline: true
+                         voiceId:
+                           type: string
+                           multiline: true
+                           required: false
                    
                      - id: emote
                        label: エモート
diff --git a/CommandForgeGenerator/CodeGenerate/CodeGenerator.cs b/CommandForgeGenerator/CodeGenerate/CodeGenerator.cs
index 745938c..913e79b 100644
--- a/CommandForgeGenerator/CodeGenerate/CodeGenerator.cs
+++ b/CommandForgeGenerator/CodeGenerate/CodeGenerator.cs
@@ -156,39 +156,42 @@ private static string GenerateCreateMethodTempVariables(List<CommandProperty> co
             else
             {
                 // nullable の場合はnullチェックを追加
-                properties.AppendLine($"var {property.CodeProperty}Token = json[\"{property.Name}\"];");
-                
-                if (property.Type is CommandPropertyType.CommandId)
+                if (property.Type is CommandPropertyType.String)
+                {
+                    properties.AppendLine($"var {property.CodeProperty} = json[\"{property.Name}\"] == null ? null : (string)json[\"{property.Name}\"];");
+                }
+                else if (property.Type is CommandPropertyType.CommandId)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : (CommandId?)((int){property.CodeProperty}Token);");
+                    properties.AppendLine($"var {property.CodeProperty} = json[\"{property.Name}\"] == null ? null : (CommandId?)((int)json[\"{property.Name}\"]);");
                 }
                 else if (property.Type is CommandPropertyType.Vector2)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : new global::UnityEngine.Vector2((float){property.CodeProperty}Token[0], (float){property.CodeProperty}Token[1]);");
+                    properties.AppendLine($"var {property.CodeProperty}Array = json[\"{property.Name}\"];");
+                    properties.AppendLine($"var {property.CodeProperty} = {property.CodeProperty}Array == null ? null : new global::UnityEngine.Vector2((float){property.CodeProperty}Array[0], (float){property.CodeProperty}Array[1]);");
                 }
                 else if (property.Type is CommandPropertyType.Vector3)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : new global::UnityEngine.Vector3((float){property.CodeProperty}Token[0], (float){property.CodeProperty}Token[1], (float){property.CodeProperty}Token[2]);");
+                    properties.AppendLine($"var {property.CodeProperty}Array = json[\"{property.Name}\"];");
+                    properties.AppendLine($"var {property.CodeProperty} = {property.CodeProperty}Array == null ? null : new global::UnityEngine.Vector3((float){property.CodeProperty}Array[0], (float){property.CodeProperty}Array[1], (float){property.CodeProperty}Array[2]);");
                 }
                 else if (property.Type is CommandPropertyType.Vector4)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : new global::UnityEngine.Vector4((float){property.CodeProperty}Token[0], (float){property.CodeProperty}Token[1], (float){property.CodeProperty}Token[2], (float){property.CodeProperty}Token[3]);");
+                    properties.AppendLine($"var {property.CodeProperty}Array = json[\"{property.Name}\"];");
+                    properties.AppendLine($"var {property.CodeProperty} = {property.CodeProperty}Array == null ? null : new global::UnityEngine.Vector4((float){property.CodeProperty}Array[0], (float){property.CodeProperty}Array[1], (float){property.CodeProperty}Array[2], (float){property.CodeProperty}Array[3]);");
                 }
                 else if (property.Type is CommandPropertyType.Vector2Int)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : new global::UnityEngine.Vector2Int((int){property.CodeProperty}Token[0], (int){property.CodeProperty}Token[1]);");
+                    properties.AppendLine($"var {property.CodeProperty}Array = json[\"{property.Name}\"];");
+                    properties.AppendLine($"var {property.CodeProperty} = {property.CodeProperty}Array == null ? null : new global::UnityEngine.Vector2Int((int){property.CodeProperty}Array[0], (int){property.CodeProperty}Array[1]);");
                 }
                 else if (property.Type is CommandPropertyType.Vector3Int)
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : new global::UnityEngine.Vector3Int((int){property.CodeProperty}Token[0], (int){property.CodeProperty}Token[1], (int){property.CodeProperty}Token[2]);");
-                }
-                else if (property.Type is CommandPropertyType.String)
-                {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : (string?){property.CodeProperty}Token;");
+                    properties.AppendLine($"var {property.CodeProperty}Array = json[\"{property.Name}\"];");
+                    properties.AppendLine($"var {property.CodeProperty} = {property.CodeProperty}Array == null ? null : new global::UnityEngine.Vector3Int((int){property.CodeProperty}Array[0], (int){property.CodeProperty}Array[1], (int){property.CodeProperty}Array[2]);");
                 }
                 else
                 {
-                    properties.AppendLine($"{type} {property.CodeProperty} = {property.CodeProperty}Token?.Type == global::Newtonsoft.Json.Linq.JTokenType.Null ? null : ({type}){property.CodeProperty}Token;");
+                    properties.AppendLine($"var {property.CodeProperty} = json[\"{property.Name}\"] == null ? null : ({type})json[\"{property.Name}\"];");
                 }
             }
         }
diff --git a/CommandForgeGenerator/Semantic/CommandSemanticsLoader.cs b/CommandForgeGenerator/Semantic/CommandSemanticsLoader.cs
index cd8cdda..01d1500 100644
--- a/CommandForgeGenerator/Semantic/CommandSemanticsLoader.cs
+++ b/CommandForgeGenerator/Semantic/CommandSemanticsLoader.cs
@@ -90,11 +90,20 @@ CommandsSemantics ParseCommandsSchema(JsonObject root)
                         _ => throw new Exception($"未知の property type \"{typeStr}\"")
                     };
                     
-                    // required フィールドを読み取る
-                    var isRequired = true;
-                    if (propObj.Nodes.ContainsKey("required") && propObj["required"] is JsonBoolean requiredNode)
+                    // required フィールドを読み取る（デフォルトはfalse）
+                    var isRequired = false;
+                    if (propObj.Nodes.ContainsKey("required"))
                     {
-                        isRequired = requiredNode.Literal;
+                        var requiredVal = propObj["required"];
+                        if (requiredVal is JsonBoolean requiredBool)
+                        {
+                            isRequired = requiredBool.Literal;
+                        }
+                        else if (requiredVal is JsonString requiredStr)
+                        {
+                            // YAMLが文字列としてbooleanを返す場合がある
+                            isRequired = requiredStr.Literal.ToLowerInvariant() == "true";
+                        }
                     }
                     
                     properties.Add(new CommandProperty(mappedType, propName, isRequired));