diff --git a/MCPForUnity/Editor/Services/Server/TerminalLauncher.cs b/MCPForUnity/Editor/Services/Server/TerminalLauncher.cs
index 764c82f6d..0d2c23616 100644
--- a/MCPForUnity/Editor/Services/Server/TerminalLauncher.cs
+++ b/MCPForUnity/Editor/Services/Server/TerminalLauncher.cs
@@ -42,10 +42,13 @@ public System.Diagnostics.ProcessStartInfo CreateHeadlessProcessStartInfo(string
             }
 
 #if UNITY_EDITOR_WIN
-            // cmd.exe /c "<command> >> "<log>" 2>&1"
+            // cmd.exe /c "<command> < NUL >> "<log>" 2>&1"
             // The whole payload after /c is wrapped in one outer pair of quotes; cmd strips the
             // outermost quotes, so inner quotes around the log path survive for paths with spaces.
-            string winRedirect = $"{command} >> \"{logFilePath}\" 2>&1";
+            // stdin is redirected from NUL because the Editor is a console-less GUI process: with
+            // CreateNoWindow and no console handle, uvx.exe would inherit an invalid stdin and die
+            // with "The handle is invalid. (os error 6)" before launching the server.
+            string winRedirect = $"{command} < NUL >> \"{logFilePath}\" 2>&1";
             return new System.Diagnostics.ProcessStartInfo
             {
                 FileName = "cmd.exe",
diff --git a/TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Server/TerminalLauncherTests.cs b/TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Server/TerminalLauncherTests.cs
index 8426643d5..63f17071b 100644
--- a/TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Server/TerminalLauncherTests.cs
+++ b/TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Server/TerminalLauncherTests.cs
@@ -212,6 +212,19 @@ public void CreateHeadlessProcessStartInfo_RedirectsOutputToLogFile()
             StringAssert.Contains(">>", startInfo.Arguments, "output should be appended to the log via >>");
         }
 
+#if UNITY_EDITOR_WIN
+        [Test]
+        public void CreateHeadlessProcessStartInfo_RedirectsStdinFromNul()
+        {
+            // Regression guard for #1279: the Editor is a console-less GUI process, so a child
+            // launched with CreateNoWindow inherits an invalid stdin and uvx.exe fails with
+            // "The handle is invalid. (os error 6)". stdin must come from NUL instead.
+            var startInfo = _launcher.CreateHeadlessProcessStartInfo("uvx run-server", LogPath());
+
+            StringAssert.Contains("< NUL", startInfo.Arguments, "stdin should be redirected from NUL");
+        }
+#endif
+
         [Test]
         public void CreateHeadlessProcessStartInfo_LogPathWithSpaces_IsQuoted()
         {