From 3913fd4443a86536155e3ebef9edd2045c372c1e Mon Sep 17 00:00:00 2001
From: jnMetaCode <alanalanal@qq.com>
Date: Mon, 30 Mar 2026 18:53:42 +0800
Subject: [PATCH] fix(stdio): always set windowsHide on Windows, not just in
 Electron (#1640)

Co-authored-by: JiangNan <1394485448@qq.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
---
 .changeset/fix-stdio-windows-hide.md |  5 +++
 src/client/stdio.ts                  |  6 +---
 test/client/cross-spawn.test.ts      | 50 ++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 5 deletions(-)
 create mode 100644 .changeset/fix-stdio-windows-hide.md

diff --git a/.changeset/fix-stdio-windows-hide.md b/.changeset/fix-stdio-windows-hide.md
new file mode 100644
index 00000000..250e0a45
--- /dev/null
+++ b/.changeset/fix-stdio-windows-hide.md
@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/sdk': patch
+---
+
+Always set windowsHide to true when spawning stdio server processes on Windows, not just in Electron environments.
diff --git a/src/client/stdio.ts b/src/client/stdio.ts
index e488dcd2..f6a71a30 100644
--- a/src/client/stdio.ts
+++ b/src/client/stdio.ts
@@ -125,7 +125,7 @@ export class StdioClientTransport implements Transport {
                 },
                 stdio: ['pipe', 'pipe', this._serverParams.stderr ?? 'inherit'],
                 shell: false,
-                windowsHide: process.platform === 'win32' && isElectron(),
+                windowsHide: process.platform === 'win32',
                 cwd: this._serverParams.cwd
             });
 
@@ -257,7 +257,3 @@ export class StdioClientTransport implements Transport {
         });
     }
 }
-
-function isElectron() {
-    return 'type' in process;
-}
diff --git a/test/client/cross-spawn.test.ts b/test/client/cross-spawn.test.ts
index 26ae682f..5a267119 100644
--- a/test/client/cross-spawn.test.ts
+++ b/test/client/cross-spawn.test.ts
@@ -150,4 +150,54 @@ describe('StdioClientTransport using cross-spawn', () => {
         // verify message is sent correctly
         expect(mockProcess.stdin.write).toHaveBeenCalled();
     });
+
+    describe('windowsHide', () => {
+        const originalPlatform = process.platform;
+
+        afterEach(() => {
+            Object.defineProperty(process, 'platform', {
+                value: originalPlatform
+            });
+        });
+
+        test('should set windowsHide to true on Windows', async () => {
+            Object.defineProperty(process, 'platform', {
+                value: 'win32'
+            });
+
+            const transport = new StdioClientTransport({
+                command: 'test-command'
+            });
+
+            await transport.start();
+
+            expect(mockSpawn).toHaveBeenCalledWith(
+                'test-command',
+                [],
+                expect.objectContaining({
+                    windowsHide: true
+                })
+            );
+        });
+
+        test('should set windowsHide to false on non-Windows', async () => {
+            Object.defineProperty(process, 'platform', {
+                value: 'linux'
+            });
+
+            const transport = new StdioClientTransport({
+                command: 'test-command'
+            });
+
+            await transport.start();
+
+            expect(mockSpawn).toHaveBeenCalledWith(
+                'test-command',
+                [],
+                expect.objectContaining({
+                    windowsHide: false
+                })
+            );
+        });
+    });
 });