Bridge: deferred init, stop-before-reload, breadcrumb logs; stable rebinds.

Editor: auto-rewrite MCP client config when package path changes.

Server: heartbeat-aware retries, structured {state: reloading, retry_after_ms}, single auto-retry across tools; guard empty calls.

Repo: remove global *~ ignore (was hiding UnityMcpServer~), track tilde server folder (Unity still excludes it from assemblies).

UnityMcpBridge/Editor/UnityMcpBridge.cs

@@ -24,7 +24,11 @@ namespace UnityMcpBridge.Editor
         private static readonly object lockObj = new();
         private static readonly object startStopLock = new();
         private static bool initScheduled = false;
+        private static bool ensureUpdateHooked = false;
+        private static bool isStarting = false;
+        private static double nextStartAt = 0.0f;
         private static double nextHeartbeatAt = 0.0f;
+        private static int heartbeatSeq = 0;
         private static Dictionary<
             string,
             (string commandJson, TaskCompletionSource<string> tcs)
@@ -32,6 +36,20 @@ namespace UnityMcpBridge.Editor
         private static int currentUnityPort = 6400; // Dynamic port, starts with default
         private static bool isAutoConnectMode = false;
         
+        // Debug helpers
+        private static bool IsDebugEnabled()
+        {
+            try { return EditorPrefs.GetBool("UnityMCP.DebugLogs", false); } catch { return false; }
+        }
+        
+        private static void LogBreadcrumb(string stage)
+        {
+            if (IsDebugEnabled())
+            {
+                Debug.Log($"<b><color=#2EA3FF>UNITY-MCP</color></b>: [{stage}]");
+            }
+        }
+
         public static bool IsRunning => isRunning;
         public static int GetCurrentPort() => currentUnityPort;
         public static bool IsAutoConnectMode() => isAutoConnectMode;
@@ -78,11 +96,24 @@ namespace UnityMcpBridge.Editor
 
         static UnityMcpBridge()
         {
-            // Immediate start for minimal downtime, plus quit hook
-            Start();
+            // Skip bridge in headless/batch environments (CI/builds)
+            if (Application.isBatchMode)
+            {
+                return;
+            }
+            // Defer start until the editor is idle and not compiling
+            ScheduleInitRetry();
+            // Add a safety net update hook in case delayCall is missed during reload churn
+            if (!ensureUpdateHooked)
+            {
+                ensureUpdateHooked = true;
+                EditorApplication.update += EnsureStartedOnEditorIdle;
+            }
             EditorApplication.quitting += Stop;
             AssemblyReloadEvents.beforeAssemblyReload += OnBeforeAssemblyReload;
             AssemblyReloadEvents.afterAssemblyReload += OnAfterAssemblyReload;
+            // Also coalesce play mode transitions into a deferred init
+            EditorApplication.playModeStateChanged += _ => ScheduleInitRetry();
         }
 
         /// <summary>
@@ -94,7 +125,7 @@ namespace UnityMcpBridge.Editor
             initScheduled = false;
 
             // Play-mode friendly: allow starting in play mode; only defer while compiling
-            if (EditorApplication.isCompiling)
+            if (IsCompiling())
             {
                 ScheduleInitRetry();
                 return;
@@ -118,9 +149,77 @@ namespace UnityMcpBridge.Editor
                 return;
             }
             initScheduled = true;
+            // Debounce: start ~200ms after the last trigger
+            nextStartAt = EditorApplication.timeSinceStartup + 0.20f;
+            // Ensure the update pump is active
+            if (!ensureUpdateHooked)
+            {
+                ensureUpdateHooked = true;
+                EditorApplication.update += EnsureStartedOnEditorIdle;
+            }
+            // Keep the original delayCall as a secondary path
             EditorApplication.delayCall += InitializeAfterCompilation;
         }
 
+        // Safety net: ensure the bridge starts shortly after domain reload when editor is idle
+        private static void EnsureStartedOnEditorIdle()
+        {
+            // Do nothing while compiling
+            if (IsCompiling())
+            {
+                return;
+            }
+
+            // If already running, remove the hook
+            if (isRunning)
+            {
+                EditorApplication.update -= EnsureStartedOnEditorIdle;
+                ensureUpdateHooked = false;
+                return;
+            }
+
+            // Debounced start: wait until the scheduled time
+            if (nextStartAt > 0 && EditorApplication.timeSinceStartup < nextStartAt)
+            {
+                return;
+            }
+
+            if (isStarting)
+            {
+                return;
+            }
+
+            isStarting = true;
+            // Attempt start; if it succeeds, remove the hook to avoid overhead
+            Start();
+            isStarting = false;
+            if (isRunning)
+            {
+                EditorApplication.update -= EnsureStartedOnEditorIdle;
+                ensureUpdateHooked = false;
+            }
+        }
+
+        // Helper to check compilation status across Unity versions
+        private static bool IsCompiling()
+        {
+            if (EditorApplication.isCompiling)
+            {
+                return true;
+            }
+            try
+            {
+                System.Type pipeline = System.Type.GetType("UnityEditor.Compilation.CompilationPipeline, UnityEditor");
+                var prop = pipeline?.GetProperty("isCompiling", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
+                if (prop != null)
+                {
+                    return (bool)prop.GetValue(null);
+                }
+            }
+            catch { }
+            return false;
+        }
+
         public static void Start()
         {
             lock (startStopLock)
@@ -140,6 +239,9 @@ namespace UnityMcpBridge.Editor
                     // Always consult PortManager first so we prefer the persisted project port
                     currentUnityPort = PortManager.GetPortWithFallback();
 
+                    // Breadcrumb: Start
+                    LogBreadcrumb("Start");
+
                     const int maxImmediateRetries = 3;
                     const int retrySleepMs = 75;
                     int attempt = 0;
@@ -153,6 +255,13 @@ namespace UnityMcpBridge.Editor
                                 SocketOptionName.ReuseAddress,
                                 true
                             );
+#if UNITY_EDITOR_WIN
+                            try
+                            {
+                                listener.ExclusiveAddressUse = false;
+                            }
+                            catch { }
+#endif
                             // Minimize TIME_WAIT by sending RST on close
                             try
                             {
@@ -180,6 +289,13 @@ namespace UnityMcpBridge.Editor
                                 SocketOptionName.ReuseAddress,
                                 true
                             );
+#if UNITY_EDITOR_WIN
+                            try
+                            {
+                                listener.ExclusiveAddressUse = false;
+                            }
+                            catch { }
+#endif
                             try
                             {
                                 listener.Server.LingerState = new LingerOption(true, 0);
@@ -198,7 +314,8 @@ namespace UnityMcpBridge.Editor
                     Task.Run(ListenerLoop);
                     EditorApplication.update += ProcessCommands;
                     // Write initial heartbeat immediately
-                    WriteHeartbeat(false);
+                    heartbeatSeq++;
+                    WriteHeartbeat(false, "ready");
                     nextHeartbeatAt = EditorApplication.timeSinceStartup + 0.5f;
                 }
                 catch (SocketException ex)
@@ -571,16 +688,22 @@ namespace UnityMcpBridge.Editor
         // Heartbeat/status helpers
         private static void OnBeforeAssemblyReload()
         {
-            WriteHeartbeat(true);
+            // Stop cleanly before reload so sockets close and clients see 'reloading'
+            try { Stop(); } catch { }
+            WriteHeartbeat(true, "reloading");
+            LogBreadcrumb("Reload");
         }
 
         private static void OnAfterAssemblyReload()
         {
             // Will be overwritten by Start(), but mark as alive quickly
-            WriteHeartbeat(false);
+            WriteHeartbeat(false, "idle");
+            LogBreadcrumb("Idle");
+            // Schedule a safe restart after reload to avoid races during compilation
+            ScheduleInitRetry();
         }
 
-        private static void WriteHeartbeat(bool reloading)
+        private static void WriteHeartbeat(bool reloading, string reason = null)
         {
             try
             {
@@ -591,6 +714,8 @@ namespace UnityMcpBridge.Editor
                 {
                     unity_port = currentUnityPort,
                     reloading,
+                    reason = reason ?? (reloading ? "reloading" : "ready"),
+                    seq = heartbeatSeq,
                     project_path = Application.dataPath,
                     last_heartbeat = DateTime.UtcNow.ToString("O")
                 };

UnityMcpBridge/Editor/Windows/UnityMcpEditorWindow.cs

@@ -1311,14 +1311,38 @@ namespace UnityMcpBridge.Editor.Windows
                 // Common logic for checking configuration status
                 if (configExists)
                 {
-                    if (pythonDir != null && 
-                        Array.Exists(args, arg => arg.Contains(pythonDir, StringComparison.Ordinal)))
+                    bool matches = pythonDir != null && Array.Exists(args, arg => arg.Contains(pythonDir, StringComparison.Ordinal));
+                    if (matches)
                     {
                         mcpClient.SetStatus(McpStatus.Configured);
                     }
                     else
                     {
-                        mcpClient.SetStatus(McpStatus.IncorrectPath);
+                        // Attempt auto-rewrite once if the package path changed
+                        try
+                        {
+                            string rewriteResult = WriteToConfig(pythonDir, configPath, mcpClient);
+                            if (rewriteResult == "Configured successfully")
+                            {
+                                if (debugLogsEnabled)
+                                {
+                                    UnityEngine.Debug.Log($"UnityMCP: Auto-updated MCP config for '{mcpClient.name}' to new path: {pythonDir}");
+                                }
+                                mcpClient.SetStatus(McpStatus.Configured);
+                            }
+                            else
+                            {
+                                mcpClient.SetStatus(McpStatus.IncorrectPath);
+                            }
+                        }
+                        catch (Exception ex)
+                        {
+                            mcpClient.SetStatus(McpStatus.IncorrectPath);
+                            if (debugLogsEnabled)
+                            {
+                                UnityEngine.Debug.LogWarning($"UnityMCP: Auto-config rewrite failed for '{mcpClient.name}': {ex.Message}");
+                            }
+                        }
                     }
                 }
                 else

UnityMcpBridge/UnityMcpServer~/src/Dockerfile

@@ -0,0 +1,27 @@
+FROM python:3.12-slim
+
+# Install required system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Install uv package manager
+RUN pip install uv
+
+# Copy required files
+COPY config.py /app/
+COPY server.py /app/
+COPY unity_connection.py /app/
+COPY pyproject.toml /app/
+COPY __init__.py /app/
+COPY tools/ /app/tools/
+
+# Install dependencies using uv
+RUN uv pip install --system -e .
+
+
+# Command to run the server
+CMD ["uv", "run", "server.py"] 

UnityMcpBridge/UnityMcpServer~/src/__init__.py

@@ -0,0 +1,3 @@
+"""
+Unity MCP Server package.
+""" 

UnityMcpBridge/UnityMcpServer~/src/config.py

@@ -0,0 +1,30 @@
+"""
+Configuration settings for the Unity MCP Server.
+This file contains all configurable parameters for the server.
+"""
+
+from dataclasses import dataclass
+
+@dataclass
+class ServerConfig:
+    """Main configuration class for the MCP server."""
+    
+    # Network settings
+    unity_host: str = "localhost"
+    unity_port: int = 6400
+    mcp_port: int = 6500
+    
+    # Connection settings
+    connection_timeout: float = 60.0  # default steady-state timeout; retries use shorter timeouts
+    buffer_size: int = 16 * 1024 * 1024  # 16MB buffer
+    
+    # Logging settings
+    log_level: str = "INFO"
+    log_format: str = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    
+    # Server settings
+    max_retries: int = 10
+    retry_delay: float = 0.25
+
+# Create a global config instance
+config = ServerConfig() 

UnityMcpBridge/UnityMcpServer~/src/port_discovery.py

@@ -0,0 +1,155 @@
+"""
+Port discovery utility for Unity MCP Server.
+
+What changed and why:
+- Unity now writes a per-project port file named like
+  `~/.unity-mcp/unity-mcp-port-<hash>.json` to avoid projects overwriting
+  each other's saved port. The legacy file `unity-mcp-port.json` may still
+  exist.
+- This module now scans for both patterns, prefers the most recently
+  modified file, and verifies that the port is actually a Unity MCP listener
+  (quick socket connect + ping) before choosing it.
+"""
+
+import json
+import os
+import logging
+from pathlib import Path
+from typing import Optional, List
+import glob
+import socket
+
+logger = logging.getLogger("unity-mcp-server")
+
+class PortDiscovery:
+    """Handles port discovery from Unity Bridge registry"""
+    REGISTRY_FILE = "unity-mcp-port.json"  # legacy single-project file
+    DEFAULT_PORT = 6400
+    CONNECT_TIMEOUT = 0.3  # seconds, keep this snappy during discovery
+    
+    @staticmethod
+    def get_registry_path() -> Path:
+        """Get the path to the port registry file"""
+        return Path.home() / ".unity-mcp" / PortDiscovery.REGISTRY_FILE
+    
+    @staticmethod
+    def get_registry_dir() -> Path:
+        return Path.home() / ".unity-mcp"
+    
+    @staticmethod
+    def list_candidate_files() -> List[Path]:
+        """Return candidate registry files, newest first.
+        Includes hashed per-project files and the legacy file (if present).
+        """
+        base = PortDiscovery.get_registry_dir()
+        hashed = sorted(
+            (Path(p) for p in glob.glob(str(base / "unity-mcp-port-*.json"))),
+            key=lambda p: p.stat().st_mtime,
+            reverse=True,
+        )
+        legacy = PortDiscovery.get_registry_path()
+        if legacy.exists():
+            # Put legacy at the end so hashed, per-project files win
+            hashed.append(legacy)
+        return hashed
+    
+    @staticmethod
+    def _try_probe_unity_mcp(port: int) -> bool:
+        """Quickly check if a Unity MCP listener is on this port.
+        Tries a short TCP connect, sends 'ping', expects a JSON 'pong'.
+        """
+        try:
+            with socket.create_connection(("127.0.0.1", port), PortDiscovery.CONNECT_TIMEOUT) as s:
+                s.settimeout(PortDiscovery.CONNECT_TIMEOUT)
+                try:
+                    s.sendall(b"ping")
+                    data = s.recv(512)
+                    # Minimal validation: look for a success pong response
+                    if data and b'"message":"pong"' in data:
+                        return True
+                except Exception:
+                    return False
+        except Exception:
+            return False
+        return False
+
+    @staticmethod
+    def _read_latest_status() -> Optional[dict]:
+        try:
+            base = PortDiscovery.get_registry_dir()
+            status_files = sorted(
+                (Path(p) for p in glob.glob(str(base / "unity-mcp-status-*.json"))),
+                key=lambda p: p.stat().st_mtime,
+                reverse=True,
+            )
+            if not status_files:
+                return None
+            with status_files[0].open('r') as f:
+                return json.load(f)
+        except Exception:
+            return None
+    
+    @staticmethod
+    def discover_unity_port() -> int:
+        """
+        Discover Unity port by scanning per-project and legacy registry files.
+        Prefer the newest file whose port responds; fall back to first parsed
+        value; finally default to 6400.
+        
+        Returns:
+            Port number to connect to
+        """
+        # Prefer the latest heartbeat status if it points to a responsive port
+        status = PortDiscovery._read_latest_status()
+        if status:
+            port = status.get('unity_port')
+            if isinstance(port, int) and PortDiscovery._try_probe_unity_mcp(port):
+                logger.info(f"Using Unity port from status: {port}")
+                return port
+
+        candidates = PortDiscovery.list_candidate_files()
+
+        first_seen_port: Optional[int] = None
+
+        for path in candidates:
+            try:
+                with open(path, 'r') as f:
+                    cfg = json.load(f)
+                unity_port = cfg.get('unity_port')
+                if isinstance(unity_port, int):
+                    if first_seen_port is None:
+                        first_seen_port = unity_port
+                    if PortDiscovery._try_probe_unity_mcp(unity_port):
+                        logger.info(f"Using Unity port from {path.name}: {unity_port}")
+                        return unity_port
+            except Exception as e:
+                logger.warning(f"Could not read port registry {path}: {e}")
+
+        if first_seen_port is not None:
+            logger.info(f"No responsive port found; using first seen value {first_seen_port}")
+            return first_seen_port
+
+        # Fallback to default port
+        logger.info(f"No port registry found; using default port {PortDiscovery.DEFAULT_PORT}")
+        return PortDiscovery.DEFAULT_PORT
+    
+    @staticmethod
+    def get_port_config() -> Optional[dict]:
+        """
+        Get the most relevant port configuration from registry.
+        Returns the most recent hashed file's config if present,
+        otherwise the legacy file's config. Returns None if nothing exists.
+        
+        Returns:
+            Port configuration dict or None if not found
+        """
+        candidates = PortDiscovery.list_candidate_files()
+        if not candidates:
+            return None
+        for path in candidates:
+            try:
+                with open(path, 'r') as f:
+                    return json.load(f)
+            except Exception as e:
+                logger.warning(f"Could not read port configuration {path}: {e}")
+        return None

UnityMcpBridge/UnityMcpServer~/src/pyproject.toml

@@ -0,0 +1,15 @@
+[project]
+name = "UnityMcpServer"
+version = "2.0.0"
+description = "Unity MCP Server: A Unity package for Unity Editor integration via the Model Context Protocol (MCP)."
+readme = "README.md"
+requires-python = ">=3.10"
+dependencies = ["httpx>=0.27.2", "mcp[cli]>=1.4.1"]
+
+[build-system]
+requires = ["setuptools>=64.0.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+py-modules = ["config", "server", "unity_connection"]
+packages = ["tools"]

UnityMcpBridge/UnityMcpServer~/src/server.py

@@ -0,0 +1,73 @@
+from mcp.server.fastmcp import FastMCP, Context, Image
+import logging
+from dataclasses import dataclass
+from contextlib import asynccontextmanager
+from typing import AsyncIterator, Dict, Any, List
+from config import config
+from tools import register_all_tools
+from unity_connection import get_unity_connection, UnityConnection
+
+# Configure logging using settings from config
+logging.basicConfig(
+    level=getattr(logging, config.log_level),
+    format=config.log_format
+)
+logger = logging.getLogger("unity-mcp-server")
+
+# Global connection state
+_unity_connection: UnityConnection = None
+
+@asynccontextmanager
+async def server_lifespan(server: FastMCP) -> AsyncIterator[Dict[str, Any]]:
+    """Handle server startup and shutdown."""
+    global _unity_connection
+    logger.info("Unity MCP Server starting up")
+    try:
+        _unity_connection = get_unity_connection()
+        logger.info("Connected to Unity on startup")
+    except Exception as e:
+        logger.warning(f"Could not connect to Unity on startup: {str(e)}")
+        _unity_connection = None
+    try:
+        # Yield the connection object so it can be attached to the context
+        # The key 'bridge' matches how tools like read_console expect to access it (ctx.bridge)
+        yield {"bridge": _unity_connection}
+    finally:
+        if _unity_connection:
+            _unity_connection.disconnect()
+            _unity_connection = None
+        logger.info("Unity MCP Server shut down")
+
+# Initialize MCP server
+mcp = FastMCP(
+    "unity-mcp-server",
+    description="Unity Editor integration via Model Context Protocol",
+    lifespan=server_lifespan
+)
+
+# Register all tools
+register_all_tools(mcp)
+
+# Asset Creation Strategy
+
+@mcp.prompt()
+def asset_creation_strategy() -> str:
+    """Guide for discovering and using Unity MCP tools effectively."""
+    return (
+        "Available Unity MCP Server Tools:\\n\\n"
+        "- `manage_editor`: Controls editor state and queries info.\\n"
+        "- `execute_menu_item`: Executes Unity Editor menu items by path.\\n"
+        "- `read_console`: Reads or clears Unity console messages, with filtering options.\\n"
+        "- `manage_scene`: Manages scenes.\\n"
+        "- `manage_gameobject`: Manages GameObjects in the scene.\\n"
+        "- `manage_script`: Manages C# script files.\\n"
+        "- `manage_asset`: Manages prefabs and assets.\\n"
+        "- `manage_shader`: Manages shaders.\\n\\n"
+        "Tips:\\n"
+        "- Create prefabs for reusable GameObjects.\\n"
+        "- Always include a camera and main light in your scenes.\\n"
+    )
+
+# Run the server
+if __name__ == "__main__":
+    mcp.run(transport='stdio')

UnityMcpBridge/UnityMcpServer~/src/tools/__init__.py

@@ -0,0 +1,21 @@
+from .manage_script import register_manage_script_tools
+from .manage_scene import register_manage_scene_tools
+from .manage_editor import register_manage_editor_tools
+from .manage_gameobject import register_manage_gameobject_tools
+from .manage_asset import register_manage_asset_tools
+from .manage_shader import register_manage_shader_tools
+from .read_console import register_read_console_tools
+from .execute_menu_item import register_execute_menu_item_tools
+
+def register_all_tools(mcp):
+    """Register all refactored tools with the MCP server."""
+    print("Registering Unity MCP Server refactored tools...")
+    register_manage_script_tools(mcp)
+    register_manage_scene_tools(mcp)
+    register_manage_editor_tools(mcp)
+    register_manage_gameobject_tools(mcp)
+    register_manage_asset_tools(mcp)
+    register_manage_shader_tools(mcp)
+    register_read_console_tools(mcp)
+    register_execute_menu_item_tools(mcp)
+    print("Unity MCP Server tool registration complete.")

UnityMcpBridge/UnityMcpServer~/src/tools/execute_menu_item.py

@@ -0,0 +1,57 @@
+"""
+Defines the execute_menu_item tool for running Unity Editor menu commands.
+"""
+from typing import Dict, Any
+from mcp.server.fastmcp import FastMCP, Context
+from unity_connection import get_unity_connection  # Import unity_connection module
+import time
+
+def register_execute_menu_item_tools(mcp: FastMCP):
+    """Registers the execute_menu_item tool with the MCP server."""
+
+    @mcp.tool()
+    async def execute_menu_item(
+        ctx: Context,
+        menu_path: str,
+        action: str = 'execute',
+        parameters: Dict[str, Any] = None,
+    ) -> Dict[str, Any]:
+        """Executes a Unity Editor menu item via its path (e.g., "File/Save Project").
+
+        Args:
+            ctx: The MCP context.
+            menu_path: The full path of the menu item to execute.
+            action: The operation to perform (default: 'execute').
+            parameters: Optional parameters for the menu item (rarely used).
+
+        Returns:
+            A dictionary indicating success or failure, with optional message/error.
+        """
+        
+        action = action.lower() if action else 'execute'
+        
+        # Prepare parameters for the C# handler
+        params_dict = {
+            "action": action,
+            "menuPath": menu_path,
+            "parameters": parameters if parameters else {},
+        }
+
+        # Remove None values
+        params_dict = {k: v for k, v in params_dict.items() if v is not None}
+
+        if "parameters" not in params_dict:
+            params_dict["parameters"] = {} # Ensure parameters dict exists
+
+        # Get Unity connection and send the command
+        # We use the unity_connection module to communicate with Unity
+        unity_conn = get_unity_connection()
+        
+        # Send command to the ExecuteMenuItem C# handler
+        # The command type should match what the Unity side expects
+        resp = unity_conn.send_command("execute_menu_item", params_dict)
+        if isinstance(resp, dict) and not resp.get("success", True) and resp.get("state") == "reloading":
+            delay_ms = int(resp.get("retry_after_ms", 250))
+            time.sleep(max(0.0, delay_ms / 1000.0))
+            resp = unity_conn.send_command("execute_menu_item", params_dict)
+        return resp

UnityMcpBridge/UnityMcpServer~/src/tools/manage_asset.py

@@ -0,0 +1,93 @@
+"""
+Defines the manage_asset tool for interacting with Unity assets.
+"""
+import asyncio  # Added: Import asyncio for running sync code in async
+from typing import Dict, Any
+from mcp.server.fastmcp import FastMCP, Context
+# from ..unity_connection import get_unity_connection  # Original line that caused error
+from unity_connection import get_unity_connection  # Use absolute import relative to Python dir
+import time
+
+def register_manage_asset_tools(mcp: FastMCP):
+    """Registers the manage_asset tool with the MCP server."""
+
+    @mcp.tool()
+    async def manage_asset(
+        ctx: Context,
+        action: str,
+        path: str,
+        asset_type: str = None,
+        properties: Dict[str, Any] = None,
+        destination: str = None,
+        generate_preview: bool = False,
+        search_pattern: str = None,
+        filter_type: str = None,
+        filter_date_after: str = None,
+        page_size: int = None,
+        page_number: int = None
+    ) -> Dict[str, Any]:
+        """Performs asset operations (import, create, modify, delete, etc.) in Unity.
+
+        Args:
+            ctx: The MCP context.
+            action: Operation to perform (e.g., 'import', 'create', 'modify', 'delete', 'duplicate', 'move', 'rename', 'search', 'get_info', 'create_folder', 'get_components').
+            path: Asset path (e.g., "Materials/MyMaterial.mat") or search scope.
+            asset_type: Asset type (e.g., 'Material', 'Folder') - required for 'create'.
+            properties: Dictionary of properties for 'create'/'modify'.
+                example properties for Material: {"color": [1, 0, 0, 1], "shader": "Standard"}.
+                example properties for Texture: {"width": 1024, "height": 1024, "format": "RGBA32"}.
+                example properties for PhysicsMaterial: {"bounciness": 1.0, "staticFriction": 0.5, "dynamicFriction": 0.5}.
+            destination: Target path for 'duplicate'/'move'.
+            search_pattern: Search pattern (e.g., '*.prefab').
+            filter_*: Filters for search (type, date).
+            page_*: Pagination for search.
+
+        Returns:
+            A dictionary with operation results ('success', 'data', 'error').
+        """
+        # Ensure properties is a dict if None
+        if properties is None:
+            properties = {}
+            
+        # Prepare parameters for the C# handler
+        params_dict = {
+            "action": action.lower(),
+            "path": path,
+            "assetType": asset_type,
+            "properties": properties,
+            "destination": destination,
+            "generatePreview": generate_preview,
+            "searchPattern": search_pattern,
+            "filterType": filter_type,
+            "filterDateAfter": filter_date_after,
+            "pageSize": page_size,
+            "pageNumber": page_number
+        }
+        
+        # Remove None values to avoid sending unnecessary nulls
+        params_dict = {k: v for k, v in params_dict.items() if v is not None}
+
+        # Get the current asyncio event loop
+        loop = asyncio.get_running_loop()
+        # Get the Unity connection instance
+        connection = get_unity_connection()
+        
+        # Run the synchronous send_command in the default executor (thread pool)
+        # This prevents blocking the main async event loop.
+        result = await loop.run_in_executor(
+            None,  # Use default executor
+            connection.send_command, # The function to call
+            "manage_asset", # First argument for send_command
+            params_dict # Second argument for send_command
+        )
+        if isinstance(result, dict) and not result.get("success", True) and result.get("state") == "reloading":
+            delay_ms = int(result.get("retry_after_ms", 250))
+            await asyncio.sleep(max(0.0, delay_ms / 1000.0))
+            result = await loop.run_in_executor(
+                None,
+                connection.send_command,
+                "manage_asset",
+                params_dict
+            )
+        # Return the result obtained from Unity
+        return result 

UnityMcpBridge/UnityMcpServer~/src/tools/manage_editor.py

@@ -0,0 +1,58 @@
+from mcp.server.fastmcp import FastMCP, Context
+import time
+from typing import Dict, Any
+from unity_connection import get_unity_connection
+
+def register_manage_editor_tools(mcp: FastMCP):
+    """Register all editor management tools with the MCP server."""
+
+    @mcp.tool()
+    def manage_editor(
+        ctx: Context,
+        action: str,
+        wait_for_completion: bool = None,
+        # --- Parameters for specific actions ---
+        tool_name: str = None, 
+        tag_name: str = None,
+        layer_name: str = None,
+    ) -> Dict[str, Any]:
+        """Controls and queries the Unity editor's state and settings.
+
+        Args:
+            action: Operation (e.g., 'play', 'pause', 'get_state', 'set_active_tool', 'add_tag').
+            wait_for_completion: Optional. If True, waits for certain actions.
+            Action-specific arguments (e.g., tool_name, tag_name, layer_name).
+
+        Returns:
+            Dictionary with operation results ('success', 'message', 'data').
+        """
+        try:
+            # Prepare parameters, removing None values
+            params = {
+                "action": action,
+                "waitForCompletion": wait_for_completion,
+                "toolName": tool_name, # Corrected parameter name to match C#
+                "tagName": tag_name,   # Pass tag name
+                "layerName": layer_name, # Pass layer name
+                # Add other parameters based on the action being performed
+                # "width": width,
+                # "height": height,
+                # etc.
+            }
+            params = {k: v for k, v in params.items() if v is not None}
+            
+            # Send command to Unity (with a single polite retry if reloading)
+            response = get_unity_connection().send_command("manage_editor", params)
+            if isinstance(response, dict) and not response.get("success", True) and response.get("state") == "reloading":
+                delay_ms = int(response.get("retry_after_ms", 250))
+                time.sleep(max(0.0, delay_ms / 1000.0))
+                response = get_unity_connection().send_command("manage_editor", params)
+
+            # Process response
+            if response.get("success"):
+                return {"success": True, "message": response.get("message", "Editor operation successful."), "data": response.get("data")}
+            else:
+                return {"success": False, "message": response.get("error", "An unknown error occurred during editor management.")}
+
+        except Exception as e:
+            return {"success": False, "message": f"Python error managing editor: {str(e)}"}

UnityMcpBridge/UnityMcpServer~/src/tools/manage_gameobject.py

@@ -0,0 +1,143 @@
+from mcp.server.fastmcp import FastMCP, Context
+from typing import Dict, Any, List
+from unity_connection import get_unity_connection
+import time
+
+def register_manage_gameobject_tools(mcp: FastMCP):
+    """Register all GameObject management tools with the MCP server."""
+
+    @mcp.tool()
+    def manage_gameobject(
+        ctx: Context,
+        action: str,
+        target: str = None,  # GameObject identifier by name or path
+        search_method: str = None,
+        # --- Combined Parameters for Create/Modify ---
+        name: str = None,  # Used for both 'create' (new object name) and 'modify' (rename)
+        tag: str = None,  # Used for both 'create' (initial tag) and 'modify' (change tag)
+        parent: str = None,  # Used for both 'create' (initial parent) and 'modify' (change parent)
+        position: List[float] = None,
+        rotation: List[float] = None,
+        scale: List[float] = None,
+        components_to_add: List[str] = None,  # List of component names to add
+        primitive_type: str = None,
+        save_as_prefab: bool = False,
+        prefab_path: str = None,
+        prefab_folder: str = "Assets/Prefabs",
+        # --- Parameters for 'modify' ---
+        set_active: bool = None,
+        layer: str = None,  # Layer name
+        components_to_remove: List[str] = None,
+        component_properties: Dict[str, Dict[str, Any]] = None,
+        # --- Parameters for 'find' ---
+        search_term: str = None,
+        find_all: bool = False,
+        search_in_children: bool = False,
+        search_inactive: bool = False,
+        # -- Component Management Arguments --
+        component_name: str = None,
+        includeNonPublicSerialized: bool = None, # Controls serialization of private [SerializeField] fields
+    ) -> Dict[str, Any]:
+        """Manages GameObjects: create, modify, delete, find, and component operations.
+
+        Args:
+            action: Operation (e.g., 'create', 'modify', 'find', 'add_component', 'remove_component', 'set_component_property', 'get_components').
+            target: GameObject identifier (name or path string) for modify/delete/component actions.
+            search_method: How to find objects ('by_name', 'by_id', 'by_path', etc.). Used with 'find' and some 'target' lookups.
+            name: GameObject name - used for both 'create' (initial name) and 'modify' (rename).
+            tag: Tag name - used for both 'create' (initial tag) and 'modify' (change tag).
+            parent: Parent GameObject reference - used for both 'create' (initial parent) and 'modify' (change parent).
+            layer: Layer name - used for both 'create' (initial layer) and 'modify' (change layer).
+            component_properties: Dict mapping Component names to their properties to set.
+                                  Example: {"Rigidbody": {"mass": 10.0, "useGravity": True}},
+                                  To set references:
+                                  - Use asset path string for Prefabs/Materials, e.g., {"MeshRenderer": {"material": "Assets/Materials/MyMat.mat"}}
+                                  - Use a dict for scene objects/components, e.g.:
+                                    {"MyScript": {"otherObject": {"find": "Player", "method": "by_name"}}} (assigns GameObject)
+                                    {"MyScript": {"playerHealth": {"find": "Player", "component": "HealthComponent"}}} (assigns Component)
+                                  Example set nested property:
+                                  - Access shared material: {"MeshRenderer": {"sharedMaterial.color": [1, 0, 0, 1]}}
+            components_to_add: List of component names to add.
+            Action-specific arguments (e.g., position, rotation, scale for create/modify;
+                     component_name for component actions;
+                     search_term, find_all for 'find').
+            includeNonPublicSerialized: If True, includes private fields marked [SerializeField] in component data.
+
+            Action-specific details:
+            - For 'get_components':
+                Required: target, search_method
+                Optional: includeNonPublicSerialized (defaults to True)
+                Returns all components on the target GameObject with their serialized data.
+                The search_method parameter determines how to find the target ('by_name', 'by_id', 'by_path').
+
+        Returns:
+            Dictionary with operation results ('success', 'message', 'data').
+            For 'get_components', the 'data' field contains a dictionary of component names and their serialized properties.
+        """
+        try:
+            # --- Early check for attempting to modify a prefab asset ---
+            # ----------------------------------------------------------
+
+            # Prepare parameters, removing None values
+            params = {
+                "action": action,
+                "target": target,
+                "searchMethod": search_method,
+                "name": name,
+                "tag": tag,
+                "parent": parent,
+                "position": position,
+                "rotation": rotation,
+                "scale": scale,
+                "componentsToAdd": components_to_add,
+                "primitiveType": primitive_type,
+                "saveAsPrefab": save_as_prefab,
+                "prefabPath": prefab_path,
+                "prefabFolder": prefab_folder,
+                "setActive": set_active,
+                "layer": layer,
+                "componentsToRemove": components_to_remove,
+                "componentProperties": component_properties,
+                "searchTerm": search_term,
+                "findAll": find_all,
+                "searchInChildren": search_in_children,
+                "searchInactive": search_inactive,
+                "componentName": component_name,
+                "includeNonPublicSerialized": includeNonPublicSerialized
+            }
+            params = {k: v for k, v in params.items() if v is not None}
+            
+            # --- Handle Prefab Path Logic ---
+            if action == "create" and params.get("saveAsPrefab"): # Check if 'saveAsPrefab' is explicitly True in params
+                if "prefabPath" not in params:
+                    if "name" not in params or not params["name"]:
+                        return {"success": False, "message": "Cannot create default prefab path: 'name' parameter is missing."}
+                    # Use the provided prefab_folder (which has a default) and the name to construct the path
+                    constructed_path = f"{prefab_folder}/{params['name']}.prefab"
+                    # Ensure clean path separators (Unity prefers '/')
+                    params["prefabPath"] = constructed_path.replace("\\", "/")
+                elif not params["prefabPath"].lower().endswith(".prefab"):
+                    return {"success": False, "message": f"Invalid prefab_path: '{params['prefabPath']}' must end with .prefab"}
+            # Ensure prefab_folder itself isn't sent if prefabPath was constructed or provided
+            # The C# side only needs the final prefabPath
+            params.pop("prefab_folder", None) 
+            # --------------------------------
+            
+            # Send the command to Unity via the established connection
+            # Use the get_unity_connection function to retrieve the active connection instance
+            # Changed "MANAGE_GAMEOBJECT" to "manage_gameobject" to potentially match Unity expectation
+            response = get_unity_connection().send_command("manage_gameobject", params)
+            if isinstance(response, dict) and not response.get("success", True) and response.get("state") == "reloading":
+                delay_ms = int(response.get("retry_after_ms", 250))
+                time.sleep(max(0.0, delay_ms / 1000.0))
+                response = get_unity_connection().send_command("manage_gameobject", params)
+
+            # Check if the response indicates success
+            # If the response is not successful, raise an exception with the error message
+            if response.get("success"):
+                return {"success": True, "message": response.get("message", "GameObject operation successful."), "data": response.get("data")}
+            else:
+                return {"success": False, "message": response.get("error", "An unknown error occurred during GameObject management.")}
+
+        except Exception as e:
+            return {"success": False, "message": f"Python error managing GameObject: {str(e)}"} 

UnityMcpBridge/UnityMcpServer~/src/tools/manage_scene.py

@@ -0,0 +1,52 @@
+from mcp.server.fastmcp import FastMCP, Context
+from typing import Dict, Any
+from unity_connection import get_unity_connection
+import time
+
+def register_manage_scene_tools(mcp: FastMCP):
+    """Register all scene management tools with the MCP server."""
+
+    @mcp.tool()
+    def manage_scene(
+        ctx: Context,
+        action: str,
+        name: str,
+        path: str,
+        build_index: int,
+    ) -> Dict[str, Any]:
+        """Manages Unity scenes (load, save, create, get hierarchy, etc.).
+
+        Args:
+            action: Operation (e.g., 'load', 'save', 'create', 'get_hierarchy').
+            name: Scene name (no extension) for create/load/save.
+            path: Asset path for scene operations (default: "Assets/").
+            build_index: Build index for load/build settings actions.
+            # Add other action-specific args as needed (e.g., for hierarchy depth)
+
+        Returns:
+            Dictionary with results ('success', 'message', 'data').
+        """
+        try:
+            params = {
+                "action": action,
+                "name": name,
+                "path": path,
+                "buildIndex": build_index
+            }
+            params = {k: v for k, v in params.items() if v is not None}
+            
+            # Send command to Unity (with a single polite retry if reloading)
+            response = get_unity_connection().send_command("manage_scene", params)
+            if isinstance(response, dict) and not response.get("success", True) and response.get("state") == "reloading":
+                delay_ms = int(response.get("retry_after_ms", 250))
+                time.sleep(max(0.0, delay_ms / 1000.0))
+                response = get_unity_connection().send_command("manage_scene", params)
+
+            # Process response
+            if response.get("success"):
+                return {"success": True, "message": response.get("message", "Scene operation successful."), "data": response.get("data")}
+            else:
+                return {"success": False, "message": response.get("error", "An unknown error occurred during scene management.")}
+
+        except Exception as e:
+            return {"success": False, "message": f"Python error managing scene: {str(e)}"}

UnityMcpBridge/UnityMcpServer~/src/tools/manage_script.py

@@ -0,0 +1,79 @@
+from mcp.server.fastmcp import FastMCP, Context
+from typing import Dict, Any
+from unity_connection import get_unity_connection
+import time
+import os
+import base64
+
+def register_manage_script_tools(mcp: FastMCP):
+    """Register all script management tools with the MCP server."""
+
+    @mcp.tool()
+    def manage_script(
+        ctx: Context,
+        action: str,
+        name: str,
+        path: str,
+        contents: str,
+        script_type: str,
+        namespace: str
+    ) -> Dict[str, Any]:
+        """Manages C# scripts in Unity (create, read, update, delete).
+        Make reference variables public for easier access in the Unity Editor.
+
+        Args:
+            action: Operation ('create', 'read', 'update', 'delete').
+            name: Script name (no .cs extension).
+            path: Asset path (default: "Assets/").
+            contents: C# code for 'create'/'update'.
+            script_type: Type hint (e.g., 'MonoBehaviour').
+            namespace: Script namespace.
+
+        Returns:
+            Dictionary with results ('success', 'message', 'data').
+        """
+        try:
+            # Prepare parameters for Unity
+            params = {
+                "action": action,
+                "name": name,
+                "path": path,
+                "namespace": namespace,
+                "scriptType": script_type
+            }
+            
+            # Base64 encode the contents if they exist to avoid JSON escaping issues
+            if contents is not None:
+                if action in ['create', 'update']:
+                    # Encode content for safer transmission
+                    params["encodedContents"] = base64.b64encode(contents.encode('utf-8')).decode('utf-8')
+                    params["contentsEncoded"] = True
+                else:
+                    params["contents"] = contents
+            
+            # Remove None values so they don't get sent as null
+            params = {k: v for k, v in params.items() if v is not None}
+
+            # Send command to Unity (with single polite retry if reloading)
+            response = get_unity_connection().send_command("manage_script", params)
+            if isinstance(response, dict) and not response.get("success", True) and response.get("state") == "reloading":
+                delay_ms = int(response.get("retry_after_ms", 250))
+                time.sleep(max(0.0, delay_ms / 1000.0))
+                response = get_unity_connection().send_command("manage_script", params)
+            
+            # Process response from Unity
+            if response.get("success"):
+                # If the response contains base64 encoded content, decode it
+                if response.get("data", {}).get("contentsEncoded"):
+                    decoded_contents = base64.b64decode(response["data"]["encodedContents"]).decode('utf-8')
+                    response["data"]["contents"] = decoded_contents
+                    del response["data"]["encodedContents"]
+                    del response["data"]["contentsEncoded"]
+                
+                return {"success": True, "message": response.get("message", "Operation successful."), "data": response.get("data")}
+            else:
+                return {"success": False, "message": response.get("error", "An unknown error occurred.")}
+
+        except Exception as e:
+            # Handle Python-side errors (e.g., connection issues)
+            return {"success": False, "message": f"Python error managing script: {str(e)}"}

UnityMcpBridge/UnityMcpServer~/src/tools/manage_shader.py

@@ -0,0 +1,72 @@
+from mcp.server.fastmcp import FastMCP, Context
+from typing import Dict, Any
+from unity_connection import get_unity_connection
+import time
+import os
+import base64
+
+def register_manage_shader_tools(mcp: FastMCP):
+    """Register all shader script management tools with the MCP server."""
+
+    @mcp.tool()
+    def manage_shader(
+        ctx: Context,
+        action: str,
+        name: str,
+        path: str,
+        contents: str,
+    ) -> Dict[str, Any]:
+        """Manages shader scripts in Unity (create, read, update, delete).
+
+        Args:
+            action: Operation ('create', 'read', 'update', 'delete').
+            name: Shader name (no .cs extension).
+            path: Asset path (default: "Assets/").
+            contents: Shader code for 'create'/'update'.
+
+        Returns:
+            Dictionary with results ('success', 'message', 'data').
+        """
+        try:
+            # Prepare parameters for Unity
+            params = {
+                "action": action,
+                "name": name,
+                "path": path,
+            }
+            
+            # Base64 encode the contents if they exist to avoid JSON escaping issues
+            if contents is not None:
+                if action in ['create', 'update']:
+                    # Encode content for safer transmission
+                    params["encodedContents"] = base64.b64encode(contents.encode('utf-8')).decode('utf-8')
+                    params["contentsEncoded"] = True
+                else:
+                    params["contents"] = contents
+            
+            # Remove None values so they don't get sent as null
+            params = {k: v for k, v in params.items() if v is not None}
+
+            # Send command to Unity
+            response = get_unity_connection().send_command("manage_shader", params)
+            if isinstance(response, dict) and not response.get("success", True) and response.get("state") == "reloading":
+                delay_ms = int(response.get("retry_after_ms", 250))
+                time.sleep(max(0.0, delay_ms / 1000.0))
+                response = get_unity_connection().send_command("manage_shader", params)
+            
+            # Process response from Unity
+            if response.get("success"):
+                # If the response contains base64 encoded content, decode it
+                if response.get("data", {}).get("contentsEncoded"):
+                    decoded_contents = base64.b64decode(response["data"]["encodedContents"]).decode('utf-8')
+                    response["data"]["contents"] = decoded_contents
+                    del response["data"]["encodedContents"]
+                    del response["data"]["contentsEncoded"]
+                
+                return {"success": True, "message": response.get("message", "Operation successful."), "data": response.get("data")}
+            else:
+                return {"success": False, "message": response.get("error", "An unknown error occurred.")}
+
+        except Exception as e:
+            # Handle Python-side errors (e.g., connection issues)
+            return {"success": False, "message": f"Python error managing shader: {str(e)}"}

UnityMcpBridge/UnityMcpServer~/src/tools/read_console.py

@@ -0,0 +1,76 @@
+"""
+Defines the read_console tool for accessing Unity Editor console messages.
+"""
+from typing import List, Dict, Any
+import time
+from mcp.server.fastmcp import FastMCP, Context
+from unity_connection import get_unity_connection
+
+def register_read_console_tools(mcp: FastMCP):
+    """Registers the read_console tool with the MCP server."""
+
+    @mcp.tool()
+    def read_console(
+        ctx: Context,
+        action: str = None,
+        types: List[str] = None,
+        count: int = None,
+        filter_text: str = None,
+        since_timestamp: str = None,
+        format: str = None,
+        include_stacktrace: bool = None
+    ) -> Dict[str, Any]:
+        """Gets messages from or clears the Unity Editor console.
+
+        Args:
+            ctx: The MCP context.
+            action: Operation ('get' or 'clear').
+            types: Message types to get ('error', 'warning', 'log', 'all').
+            count: Max messages to return.
+            filter_text: Text filter for messages.
+            since_timestamp: Get messages after this timestamp (ISO 8601).
+            format: Output format ('plain', 'detailed', 'json').
+            include_stacktrace: Include stack traces in output.
+
+        Returns:
+            Dictionary with results. For 'get', includes 'data' (messages).
+        """
+        
+        # Get the connection instance
+        bridge = get_unity_connection()
+
+        # Set defaults if values are None
+        action = action if action is not None else 'get'
+        types = types if types is not None else ['error', 'warning', 'log']
+        format = format if format is not None else 'detailed'
+        include_stacktrace = include_stacktrace if include_stacktrace is not None else True
+
+        # Normalize action if it's a string
+        if isinstance(action, str):
+            action = action.lower()
+        
+        # Prepare parameters for the C# handler
+        params_dict = {
+            "action": action,
+            "types": types,
+            "count": count,
+            "filterText": filter_text,
+            "sinceTimestamp": since_timestamp,
+            "format": format.lower() if isinstance(format, str) else format,
+            "includeStacktrace": include_stacktrace
+        }
+
+        # Remove None values unless it's 'count' (as None might mean 'all')
+        params_dict = {k: v for k, v in params_dict.items() if v is not None or k == 'count'} 
+        
+        # Add count back if it was None, explicitly sending null might be important for C# logic
+        if 'count' not in params_dict:
+             params_dict['count'] = None 
+
+        # Forward the command using the bridge's send_command method (with a single polite retry on reload)
+        resp = bridge.send_command("read_console", params_dict)
+        if isinstance(resp, dict) and not resp.get("success", True) and resp.get("state") == "reloading":
+            delay_ms = int(resp.get("retry_after_ms", 250))
+            time.sleep(max(0.0, delay_ms / 1000.0))
+            resp = bridge.send_command("read_console", params_dict)
+        return resp 

UnityMcpBridge/UnityMcpServer~/src/unity_connection.py

@@ -0,0 +1,280 @@
+import socket
+import json
+import logging
+from dataclasses import dataclass
+from pathlib import Path
+import time
+import random
+import errno
+from typing import Dict, Any
+from config import config
+from port_discovery import PortDiscovery
+
+# Configure logging using settings from config
+logging.basicConfig(
+    level=getattr(logging, config.log_level),
+    format=config.log_format
+)
+logger = logging.getLogger("unity-mcp-server")
+
+@dataclass
+class UnityConnection:
+    """Manages the socket connection to the Unity Editor."""
+    host: str = config.unity_host
+    port: int = None  # Will be set dynamically
+    sock: socket.socket = None  # Socket for Unity communication
+    
+    def __post_init__(self):
+        """Set port from discovery if not explicitly provided"""
+        if self.port is None:
+            self.port = PortDiscovery.discover_unity_port()
+
+    def connect(self) -> bool:
+        """Establish a connection to the Unity Editor."""
+        if self.sock:
+            return True
+        try:
+            self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            self.sock.connect((self.host, self.port))
+            logger.info(f"Connected to Unity at {self.host}:{self.port}")
+            return True
+        except Exception as e:
+            logger.error(f"Failed to connect to Unity: {str(e)}")
+            self.sock = None
+            return False
+
+    def disconnect(self):
+        """Close the connection to the Unity Editor."""
+        if self.sock:
+            try:
+                self.sock.close()
+            except Exception as e:
+                logger.error(f"Error disconnecting from Unity: {str(e)}")
+            finally:
+                self.sock = None
+
+    def receive_full_response(self, sock, buffer_size=config.buffer_size) -> bytes:
+        """Receive a complete response from Unity, handling chunked data."""
+        chunks = []
+        sock.settimeout(config.connection_timeout)  # Use timeout from config
+        try:
+            while True:
+                chunk = sock.recv(buffer_size)
+                if not chunk:
+                    if not chunks:
+                        raise Exception("Connection closed before receiving data")
+                    break
+                chunks.append(chunk)
+                
+                # Process the data received so far
+                data = b''.join(chunks)
+                decoded_data = data.decode('utf-8')
+                
+                # Check if we've received a complete response
+                try:
+                    # Special case for ping-pong
+                    if decoded_data.strip().startswith('{"status":"success","result":{"message":"pong"'):
+                        logger.debug("Received ping response")
+                        return data
+                    
+                    # Handle escaped quotes in the content
+                    if '"content":' in decoded_data:
+                        # Find the content field and its value
+                        content_start = decoded_data.find('"content":') + 9
+                        content_end = decoded_data.rfind('"', content_start)
+                        if content_end > content_start:
+                            # Replace escaped quotes in content with regular quotes
+                            content = decoded_data[content_start:content_end]
+                            content = content.replace('\\"', '"')
+                            decoded_data = decoded_data[:content_start] + content + decoded_data[content_end:]
+                    
+                    # Validate JSON format
+                    json.loads(decoded_data)
+                    
+                    # If we get here, we have valid JSON
+                    logger.info(f"Received complete response ({len(data)} bytes)")
+                    return data
+                except json.JSONDecodeError:
+                    # We haven't received a complete valid JSON response yet
+                    continue
+                except Exception as e:
+                    logger.warning(f"Error processing response chunk: {str(e)}")
+                    # Continue reading more chunks as this might not be the complete response
+                    continue
+        except socket.timeout:
+            logger.warning("Socket timeout during receive")
+            raise Exception("Timeout receiving Unity response")
+        except Exception as e:
+            logger.error(f"Error during receive: {str(e)}")
+            raise
+
+    def send_command(self, command_type: str, params: Dict[str, Any] = None) -> Dict[str, Any]:
+        """Send a command with retry/backoff and port rediscovery. Pings only when requested."""
+        # Defensive guard: catch empty/placeholder invocations early
+        if not command_type:
+            raise ValueError("MCP call missing command_type")
+        if params is None:
+            # Return a fast, structured error that clients can display without hanging
+            return {"success": False, "error": "MCP call received with no parameters (client placeholder?)"}
+        attempts = max(config.max_retries, 5)
+        base_backoff = max(0.5, config.retry_delay)
+
+        def read_status_file() -> dict | None:
+            try:
+                status_files = sorted(Path.home().joinpath('.unity-mcp').glob('unity-mcp-status-*.json'), key=lambda p: p.stat().st_mtime, reverse=True)
+                if not status_files:
+                    return None
+                latest = status_files[0]
+                with latest.open('r') as f:
+                    return json.load(f)
+            except Exception:
+                return None
+
+        last_short_timeout = None
+
+        # Preflight: if Unity reports reloading, return a structured hint so clients can retry politely
+        try:
+            status = read_status_file()
+            if status and (status.get('reloading') or status.get('reason') == 'reloading'):
+                return {
+                    "success": False,
+                    "state": "reloading",
+                    "retry_after_ms": int(250),
+                    "error": "Unity domain reload in progress",
+                    "message": "Unity is reloading scripts; please retry shortly"
+                }
+        except Exception:
+            pass
+
+        for attempt in range(attempts + 1):
+            try:
+                # Ensure connected
+                if not self.sock:
+                    # During retries use short connect timeout
+                    self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+                    self.sock.settimeout(1.0)
+                    self.sock.connect((self.host, self.port))
+                    # restore steady-state timeout for receive
+                    self.sock.settimeout(config.connection_timeout)
+                    logger.info(f"Connected to Unity at {self.host}:{self.port}")
+
+                # Build payload
+                if command_type == 'ping':
+                    payload = b'ping'
+                else:
+                    command = {"type": command_type, "params": params or {}}
+                    payload = json.dumps(command, ensure_ascii=False).encode('utf-8')
+
+                # Send
+                self.sock.sendall(payload)
+
+                # During retry bursts use a short receive timeout
+                if attempt > 0 and last_short_timeout is None:
+                    last_short_timeout = self.sock.gettimeout()
+                    self.sock.settimeout(1.0)
+                response_data = self.receive_full_response(self.sock)
+                # restore steady-state timeout if changed
+                if last_short_timeout is not None:
+                    self.sock.settimeout(config.connection_timeout)
+                    last_short_timeout = None
+
+                # Parse
+                if command_type == 'ping':
+                    resp = json.loads(response_data.decode('utf-8'))
+                    if resp.get('status') == 'success' and resp.get('result', {}).get('message') == 'pong':
+                        return {"message": "pong"}
+                    raise Exception("Ping unsuccessful")
+
+                resp = json.loads(response_data.decode('utf-8'))
+                if resp.get('status') == 'error':
+                    err = resp.get('error') or resp.get('message', 'Unknown Unity error')
+                    raise Exception(err)
+                return resp.get('result', {})
+            except Exception as e:
+                logger.warning(f"Unity communication attempt {attempt+1} failed: {e}")
+                try:
+                    if self.sock:
+                        self.sock.close()
+                finally:
+                    self.sock = None
+
+                # Re-discover port each time
+                try:
+                    new_port = PortDiscovery.discover_unity_port()
+                    if new_port != self.port:
+                        logger.info(f"Unity port changed {self.port} -> {new_port}")
+                    self.port = new_port
+                except Exception as de:
+                    logger.debug(f"Port discovery failed: {de}")
+
+                if attempt < attempts:
+                    # Heartbeat-aware, jittered backoff
+                    status = read_status_file()
+                    # Base exponential backoff
+                    backoff = base_backoff * (2 ** attempt)
+                    # Decorrelated jitter multiplier
+                    jitter = random.uniform(0.1, 0.3)
+
+                    # Fast‑retry for transient socket failures
+                    fast_error = isinstance(e, (ConnectionRefusedError, ConnectionResetError, TimeoutError))
+                    if not fast_error:
+                        try:
+                            err_no = getattr(e, 'errno', None)
+                            fast_error = err_no in (errno.ECONNREFUSED, errno.ECONNRESET, errno.ETIMEDOUT)
+                        except Exception:
+                            pass
+
+                    # Cap backoff depending on state
+                    if status and status.get('reloading'):
+                        cap = 0.8
+                    elif fast_error:
+                        cap = 0.25
+                    else:
+                        cap = 3.0
+
+                    sleep_s = min(cap, jitter * (2 ** attempt))
+                    time.sleep(sleep_s)
+                    continue
+                raise
+
+# Global Unity connection
+_unity_connection = None
+
+def get_unity_connection() -> UnityConnection:
+    """Retrieve or establish a persistent Unity connection."""
+    global _unity_connection
+    if _unity_connection is not None:
+        try:
+            # Try to ping with a short timeout to verify connection
+            result = _unity_connection.send_command("ping")
+            # If we get here, the connection is still valid
+            logger.debug("Reusing existing Unity connection")
+            return _unity_connection
+        except Exception as e:
+            logger.warning(f"Existing connection failed: {str(e)}")
+            try:
+                _unity_connection.disconnect()
+            except:
+                pass
+            _unity_connection = None
+    
+    # Create a new connection
+    logger.info("Creating new Unity connection")
+    _unity_connection = UnityConnection()
+    if not _unity_connection.connect():
+        _unity_connection = None
+        raise ConnectionError("Could not connect to Unity. Ensure the Unity Editor and MCP Bridge are running.")
+    
+    try:
+        # Verify the new connection works
+        _unity_connection.send_command("ping")
+        logger.info("Successfully established new Unity connection")
+        return _unity_connection
+    except Exception as e:
+        logger.error(f"Could not verify new connection: {str(e)}")
+        try:
+            _unity_connection.disconnect()
+        except:
+            pass
+        _unity_connection = None
+        raise ConnectionError(f"Could not establish valid Unity connection: {str(e)}") 

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