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Packages/MCPForUnity/Editor/Helpers/StringCaseUtility.cs

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+using System;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace MCPForUnity.Editor.Helpers
+{
+    /// <summary>
+    /// Utility class for converting between naming conventions (snake_case, camelCase).
+    /// Consolidates previously duplicated implementations from ToolParams, ManageVFX,
+    /// BatchExecute, CommandRegistry, and ToolDiscoveryService.
+    /// </summary>
+    public static class StringCaseUtility
+    {
+        /// <summary>
+        /// Checks whether a type belongs to the built-in MCP for Unity package.
+        /// Returns true when the type's namespace starts with
+        /// <paramref name="builtInNamespacePrefix"/> or its assembly is MCPForUnity.Editor.
+        /// </summary>
+        public static bool IsBuiltInMcpType(Type type, string assemblyName, string builtInNamespacePrefix)
+        {
+            if (type != null && !string.IsNullOrEmpty(type.Namespace)
+                && type.Namespace.StartsWith(builtInNamespacePrefix, StringComparison.Ordinal))
+            {
+                return true;
+            }
+
+            if (!string.IsNullOrEmpty(assemblyName)
+                && assemblyName.Equals("MCPForUnity.Editor", StringComparison.Ordinal))
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Converts a camelCase string to snake_case.
+        /// Example: "searchMethod" -> "search_method", "param1Value" -> "param1_value"
+        /// </summary>
+        /// <param name="str">The camelCase string to convert</param>
+        /// <returns>The snake_case equivalent, or original string if null/empty</returns>
+        public static string ToSnakeCase(string str)
+        {
+            if (string.IsNullOrEmpty(str))
+                return str;
+
+            return Regex.Replace(str, "([a-z0-9])([A-Z])", "$1_$2").ToLowerInvariant();
+        }
+
+        /// <summary>
+        /// Converts a snake_case string to camelCase.
+        /// Example: "search_method" -> "searchMethod"
+        /// </summary>
+        /// <param name="str">The snake_case string to convert</param>
+        /// <returns>The camelCase equivalent, or original string if null/empty or no underscores</returns>
+        public static string ToCamelCase(string str)
+        {
+            if (string.IsNullOrEmpty(str) || !str.Contains("_"))
+                return str;
+
+            var parts = str.Split('_');
+            if (parts.Length == 0)
+                return str;
+
+            // First part stays lowercase, rest get capitalized
+            var first = parts[0];
+            var rest = string.Concat(parts.Skip(1).Select(part =>
+                string.IsNullOrEmpty(part) ? "" : char.ToUpperInvariant(part[0]) + part.Substring(1)));
+
+            return first + rest;
+        }
+    }
+}