fix: Fix for miss configuration on Claude Code MCP auto config as reported in issue #63

Author: CoderGamester

Editor/Utils/McpUtils.cs

@@ -186,36 +186,17 @@ private static bool AddToConfigFile(string configFilePath, bool useTabsIndentati
 
             // Generate fresh MCP config JSON
             string mcpConfigJson = GenerateMcpConfigJson(useTabsIndentation);
-                
-            // Parse the MCP config JSON
-            JObject mcpConfig = JObject.Parse(mcpConfigJson);
 
             try
             {
+                // Parse the MCP config JSON
+                JObject mcpConfig = JObject.Parse(mcpConfigJson);
+
                 // Check if the file exists
                 if (File.Exists(configFilePath))
                 {
-                    // Read the existing config
-                    string existingConfigJson = File.ReadAllText(configFilePath);
-                    JObject existingConfig = string.IsNullOrEmpty(existingConfigJson) ? new JObject() : JObject.Parse(existingConfigJson);
-                    
-                    // Merge the mcpServers from our config into the existing config
-                    if (mcpConfig["mcpServers"] != null && mcpConfig["mcpServers"] is JObject mcpServers)
+                    if (TryMergeMcpServers(configFilePath, mcpConfig, productName))
                     {
-                        // Create mcpServers object if it doesn't exist
-                        if (existingConfig["mcpServers"] == null)
-                        {
-                            existingConfig["mcpServers"] = new JObject();
-                        }
-                        
-                        // Add or update the mcp-unity server config
-                        if (mcpServers["mcp-unity"] != null)
-                        {
-                            ((JObject)existingConfig["mcpServers"])["mcp-unity"] = mcpServers["mcp-unity"];
-                        }
-                        
-                        // Write the updated config back to the file
-                        File.WriteAllText(configFilePath, existingConfig.ToString(Formatting.Indented));
                         return true;
                     }
                 }
@@ -337,24 +318,28 @@ private static string GetCursorConfigPath()
         /// <returns>The path to the Claude Code config file</returns>
         private static string GetClaudeCodeConfigPath()
         {
-            string basePath;
+            // Returns the absolute path to the global Claude configuration file.
+            // Windows: %USERPROFILE%\.claude.json
+            // macOS/Linux: $HOME/.claude.json
+            string homeDir;
+
             if (Application.platform == RuntimePlatform.WindowsEditor)
             {
-                // Windows: %USERPROFILE%\.claude-code\mcp.json
-                basePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".claude-code");
+                // Windows: %USERPROFILE%\.claude.json
+                homeDir = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
             }
             else if (Application.platform == RuntimePlatform.OSXEditor)
             {
-                // macOS: ~/.claude-code/mcp.json
-                string homeDir = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
-                basePath = Path.Combine(homeDir, ".claude-code");
+                // macOS: ~/.claude.json
+                homeDir = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
             }
             else
             {
-                Debug.LogError("Unsupported platform for Claude Code MCP config");
+                Debug.LogError("Unsupported platform for Claude configuration path resolution");
                 return null;
             }
-            return Path.Combine(basePath, "mcp.json");
+
+            return Path.Combine(homeDir, ".claude.json");
         }
 
         /// <summary>
@@ -445,5 +430,73 @@ public static void RunNpmCommand(string arguments, string workingDirectory)
                 Debug.LogError($"[MCP Unity] Exception while running npm {arguments} in {workingDirectory}. Error: {ex.Message}");
             }
         }
+
+        /// <summary>
+        /// Returns the appropriate config JObject for merging MCP server settings,
+        /// with special handling for "Claude Code":
+        /// - For most products, returns the root config object.
+        /// - For "Claude Code", returns the project-specific config under "projects/[serverPathParent]".
+        /// Throws a MissingMemberException if the expected project entry does not exist.
+        /// </summary>
+        private static JObject GetMcpServersConfig(JObject existingConfig, string productName)
+        {
+            // For most products, use the root config object.
+            if (productName != "Claude Code")
+            {
+                return existingConfig;
+            }
+
+            // For Claude Code, use the project-specific config.
+            if (existingConfig["projects"] == null)
+            {
+                throw new MissingMemberException("Claude Code config error: Could not find 'projects' entry in existing config.");
+            }
+
+            string serverPath = GetServerPath();
+            string serverPathParent = Path.GetDirectoryName(serverPath)?.Replace("\\", "/");
+            var projectConfig = existingConfig["projects"][serverPathParent];
+
+            if (projectConfig == null)
+            {
+                throw new MissingMemberException(
+                    $"Claude Code config error: Could not find project entry for parent directory '{serverPathParent}' in existing config."
+                );
+            }
+
+            return (JObject)projectConfig;
+        }
+
+        /// <summary>
+        /// Helper to merge mcpServers from mcpConfig into the existing config file.
+        /// </summary>
+        private static bool TryMergeMcpServers(string configFilePath, JObject mcpConfig, string productName)
+        {
+            // Read the existing config
+            string existingConfigJson = File.ReadAllText(configFilePath);
+            JObject existingConfig = string.IsNullOrEmpty(existingConfigJson) ? new JObject() : JObject.Parse(existingConfigJson);
+            JObject mcpServersConfig = GetMcpServersConfig(existingConfig, productName);
+
+            // Merge the mcpServers from our config into the existing config
+            if (mcpConfig["mcpServers"] != null && mcpConfig["mcpServers"] is JObject mcpServers)
+            {
+                // Create mcpServers object if it doesn't exist
+                if (mcpServersConfig["mcpServers"] == null)
+                {
+                    mcpServersConfig["mcpServers"] = new JObject();
+                }
+
+                // Add or update the mcp-unity server config
+                if (mcpServers["mcp-unity"] != null)
+                {
+                    ((JObject)mcpServersConfig["mcpServers"])["mcp-unity"] = mcpServers["mcp-unity"];
+                }
+
+                // Write the updated config back to the file
+                File.WriteAllText(configFilePath, existingConfig.ToString(Formatting.Indented));
+                return true;
+            }
+
+            return false;
+        }
     }
 }