Fix/port discovery missing imports

MCPForUnity/Editor/Helpers/ExecPath.cs

@@ -132,6 +132,56 @@ private static string ResolveClaudeFromNvm(string home)
             catch { return null; }
         }
 
+        // Resolve uvx absolute path. Pref -> env -> common locations -> PATH.
+        internal static string ResolveUvx()
+        {
+            try
+            {
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX) || RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                {
+                    string home = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) ?? string.Empty;
+                    string[] candidates =
+                    {
+                        Path.Combine(home, ".local", "bin", "uvx"),
+                        Path.Combine(home, ".cargo", "bin", "uvx"),
+                        "/usr/local/bin/uvx",
+                        "/opt/homebrew/bin/uvx",
+                        "/usr/bin/uvx"
+                    };
+                    foreach (string c in candidates) { if (File.Exists(c)) return c; }
+
+#if UNITY_EDITOR_OSX || UNITY_EDITOR_LINUX
+                    return Which("uvx", "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin");
+#else
+                    return null;
+#endif
+                }
+
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+#if UNITY_EDITOR_WIN
+                    string userProfile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+                    string localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+
+                    string[] candidates =
+                    {
+                        Path.Combine(userProfile, ".cargo", "bin", "uvx.exe"),
+                        Path.Combine(localAppData, "uv", "uvx.exe"),
+                        Path.Combine(userProfile, "uv", "uvx.exe"),
+                    };
+                    foreach (string c in candidates) { if (File.Exists(c)) return c; }
+
+                    string fromWhere = Where("uvx.exe") ?? Where("uvx");
+                    if (!string.IsNullOrEmpty(fromWhere)) return fromWhere;
+#endif
+                    return null;
+                }
+            }
+            catch { }
+
+            return null;
+        }
+
         // Explicitly set the Claude CLI absolute path override in EditorPrefs
         internal static void SetClaudeCliPath(string absolutePath)
         {

MCPForUnity/Editor/Services/PathResolverService.cs

@@ -34,6 +34,13 @@ public string GetUvxPath()
                 McpLog.Debug("No uvx path override found, falling back to default command");
             }
 
+            // Auto-discovery of absolute path
+            string discovered = ExecPath.ResolveUvx();
+            if (!string.IsNullOrEmpty(discovered))
+            {
+                return discovered;
+            }
+
             return "uvx";
         }
 

MCPForUnity/README.md

@@ -82,6 +82,10 @@ Notes:
   - Help: [Fix MCP for Unity with Cursor, VS Code & Windsurf](https://github.com/CoplayDev/unity-mcp/wiki/1.-Fix-Unity-MCP-and-Cursor,-VSCode-&-Windsurf)
 - Claude CLI not found:
   - Help: [Fix MCP for Unity with Claude Code](https://github.com/CoplayDev/unity-mcp/wiki/2.-Fix-Unity-MCP-and-Claude-Code)
+- Claude Desktop "spawn uvx ENOENT" error on macOS:
+  - Claude Desktop may not inherit your shell's PATH.
+  - The MCP for Unity plugin attempts to automatically resolve the absolute path to `uvx`.
+  - If this fails, use the "Choose UV Install Location" button in the MCP for Unity window to select your `uvx` executable (typically `~/.local/bin/uvx`), or manually update your Claude Desktop config to use the absolute path to `uvx`.
 
 ---
 

Server/src/transport/legacy/port_discovery.py

@@ -14,6 +14,8 @@
 import glob
 import json
 import logging
+import os
+import struct
 from datetime import datetime
 from pathlib import Path
 import socket