feat: add Unity editor state and project info resources

- Implemented resources for querying active tool, editor state, prefab stage, selection, and open windows
- Added project configuration resources for layers and project metadata
- Organized new resources into Editor and Project namespaces for better structure

Author: msanatan

TestProjects/UnityMCPTests/Assets/Materials.meta renamed to MCPForUnity/Editor/Resources/Editor.meta

@@ -0,0 +1,64 @@
+using System;
+using MCPForUnity.Editor.Helpers;
+using Newtonsoft.Json.Linq;
+using UnityEditor;
+
+namespace MCPForUnity.Editor.Resources.Editor
+{
+    /// <summary>
+    /// Provides information about the currently active editor tool.
+    /// </summary>
+    [McpForUnityResource("get_active_tool")]
+    public static class ActiveTool
+    {
+        public static object HandleCommand(JObject @params)
+        {
+            try
+            {
+                Tool currentTool = UnityEditor.Tools.current;
+                string toolName = currentTool.ToString();
+                bool customToolActive = UnityEditor.Tools.current == Tool.Custom;
+                string activeToolName = customToolActive ? EditorTools.GetActiveToolName() : toolName;
+
+                var toolInfo = new
+                {
+                    activeTool = activeToolName,
+                    isCustom = customToolActive,
+                    pivotMode = UnityEditor.Tools.pivotMode.ToString(),
+                    pivotRotation = UnityEditor.Tools.pivotRotation.ToString(),
+                    handleRotation = new
+                    {
+                        x = UnityEditor.Tools.handleRotation.eulerAngles.x,
+                        y = UnityEditor.Tools.handleRotation.eulerAngles.y,
+                        z = UnityEditor.Tools.handleRotation.eulerAngles.z
+                    },
+                    handlePosition = new
+                    {
+                        x = UnityEditor.Tools.handlePosition.x,
+                        y = UnityEditor.Tools.handlePosition.y,
+                        z = UnityEditor.Tools.handlePosition.z
+                    }
+                };
+
+                return Response.Success("Retrieved active tool information.", toolInfo);
+            }
+            catch (Exception e)
+            {
+                return Response.Error($"Error getting active tool: {e.Message}");
+            }
+        }
+    }
+
+    // Helper class for custom tool names
+    internal static class EditorTools
+    {
+        public static string GetActiveToolName()
+        {
+            if (UnityEditor.Tools.current == Tool.Custom)
+            {
+                return "Unknown Custom Tool";
+            }
+            return UnityEditor.Tools.current.ToString();
+        }
+    }
+}

MCPForUnity/Editor/Resources/Editor/ActiveTool.cs

@@ -0,0 +1,40 @@
+using System;
+using MCPForUnity.Editor.Helpers;
+using Newtonsoft.Json.Linq;
+using UnityEditor;
+using UnityEditor.SceneManagement;
+
+namespace MCPForUnity.Editor.Resources.Editor
+{
+    /// <summary>
+    /// Provides dynamic editor state information that changes frequently.
+    /// </summary>
+    [McpForUnityResource("get_editor_state")]
+    public static class EditorState
+    {
+        public static object HandleCommand(JObject @params)
+        {
+            try
+            {
+                var activeScene = EditorSceneManager.GetActiveScene();
+                var state = new
+                {
+                    isPlaying = EditorApplication.isPlaying,
+                    isPaused = EditorApplication.isPaused,
+                    isCompiling = EditorApplication.isCompiling,
+                    isUpdating = EditorApplication.isUpdating,
+                    timeSinceStartup = EditorApplication.timeSinceStartup,
+                    activeSceneName = activeScene.name ?? "",
+                    selectionCount = UnityEditor.Selection.count,
+                    activeObjectName = UnityEditor.Selection.activeObject?.name
+                };
+                
+                return Response.Success("Retrieved editor state.", state);
+            }
+            catch (Exception e)
+            {
+                return Response.Error($"Error getting editor state: {e.Message}");
+            }
+        }
+    }
+}

MCPForUnity/Editor/Resources/Editor/ActiveTool.cs.meta

@@ -0,0 +1,43 @@
+using System;
+using MCPForUnity.Editor.Helpers;
+using Newtonsoft.Json.Linq;
+using UnityEditor.SceneManagement;
+
+namespace MCPForUnity.Editor.Resources.Editor
+{
+    /// <summary>
+    /// Provides information about the current prefab editing context.
+    /// </summary>
+    [McpForUnityResource("get_prefab_stage")]
+    public static class PrefabStage
+    {
+        public static object HandleCommand(JObject @params)
+        {
+            try
+            {
+                PrefabStageUtility.GetCurrentPrefabStage();
+                var stage = PrefabStageUtility.GetCurrentPrefabStage();
+                
+                if (stage == null)
+                {
+                    return Response.Success("No prefab stage is currently open.", new { isOpen = false });
+                }
+
+                var stageInfo = new
+                {
+                    isOpen = true,
+                    assetPath = stage.assetPath,
+                    prefabRootName = stage.prefabContentsRoot?.name,
+                    mode = stage.mode.ToString(),
+                    isDirty = stage.scene.isDirty
+                };
+
+                return Response.Success("Prefab stage info retrieved.", stageInfo);
+            }
+            catch (Exception e)
+            {
+                return Response.Error($"Error getting prefab stage info: {e.Message}");
+            }
+        }
+    }
+}

MCPForUnity/Editor/Resources/Editor/EditorState.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Linq;
+using MCPForUnity.Editor.Helpers;
+using Newtonsoft.Json.Linq;
+using UnityEditor;
+
+namespace MCPForUnity.Editor.Resources.Editor
+{
+    /// <summary>
+    /// Provides detailed information about the current editor selection.
+    /// </summary>
+    [McpForUnityResource("get_selection")]
+    public static class Selection
+    {
+        public static object HandleCommand(JObject @params)
+        {
+            try
+            {
+                var selectionInfo = new
+                {
+                    activeObject = UnityEditor.Selection.activeObject?.name,
+                    activeGameObject = UnityEditor.Selection.activeGameObject?.name,
+                    activeTransform = UnityEditor.Selection.activeTransform?.name,
+                    activeInstanceID = UnityEditor.Selection.activeInstanceID,
+                    count = UnityEditor.Selection.count,
+                    objects = UnityEditor.Selection.objects
+                        .Select(obj => new
+                        {
+                            name = obj?.name,
+                            type = obj?.GetType().FullName,
+                            instanceID = obj?.GetInstanceID()
+                        })
+                        .ToList(),
+                    gameObjects = UnityEditor.Selection.gameObjects
+                        .Select(go => new
+                        {
+                            name = go?.name,
+                            instanceID = go?.GetInstanceID()
+                        })
+                        .ToList(),
+                    assetGUIDs = UnityEditor.Selection.assetGUIDs
+                };
+
+                return Response.Success("Retrieved current selection details.", selectionInfo);
+            }
+            catch (Exception e)
+            {
+                return Response.Error($"Error getting selection: {e.Message}");
+            }
+        }
+    }
+}

MCPForUnity/Editor/Resources/Editor/EditorState.cs.meta

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using MCPForUnity.Editor.Helpers;
+using Newtonsoft.Json.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace MCPForUnity.Editor.Resources.Editor
+{
+    /// <summary>
+    /// Provides list of all open editor windows.
+    /// </summary>
+    [McpForUnityResource("get_windows")]
+    public static class Windows
+    {
+        public static object HandleCommand(JObject @params)
+        {
+            try
+            {
+                EditorWindow[] allWindows = UnityEngine.Resources.FindObjectsOfTypeAll<EditorWindow>();
+                var openWindows = new List<object>();
+
+                foreach (EditorWindow window in allWindows)
+                {
+                    if (window == null)
+                        continue;
+
+                    try
+                    {
+                        openWindows.Add(new
+                        {
+                            title = window.titleContent.text,
+                            typeName = window.GetType().FullName,
+                            isFocused = EditorWindow.focusedWindow == window,
+                            position = new
+                            {
+                                x = window.position.x,
+                                y = window.position.y,
+                                width = window.position.width,
+                                height = window.position.height
+                            },
+                            instanceID = window.GetInstanceID()
+                        });
+                    }
+                    catch (Exception ex)
+                    {
+                        Debug.LogWarning($"Could not get info for window {window.GetType().Name}: {ex.Message}");
+                    }
+                }
+
+                return Response.Success("Retrieved list of open editor windows.", openWindows);
+            }
+            catch (Exception e)
+            {
+                return Response.Error($"Error getting editor windows: {e.Message}");
+            }
+        }
+    }
+}