From 8db04a19960e8748f1a620b40dd1be8914e56c23 Mon Sep 17 00:00:00 2001
From: Mordris <118046112+Mordris@users.noreply.github.com>
Date: Mon, 6 Jul 2026 15:22:43 +0300
Subject: [PATCH] fix(server): preserve Windows path backslashes when parsing
 stdio args

shell-quote treats `\` as its escape character, so parsing the args
string on Windows stripped every backslash from paths like
C:\Users\name\app.jar and the resulting file could not be found. Parse
with cmd.exe's escape character `^` on win32 instead. Other platforms
are unchanged.

Fixes #853
---
 server/src/index.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/server/src/index.ts b/server/src/index.ts
index bdfe49019..82158ba73 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -436,7 +436,14 @@ const createTransport = async (
 
   if (transportType === "stdio") {
     const command = (query.command as string).trim();
-    const origArgs = shellParseArgs(query.args as string) as string[];
+    // shell-quote's default escape character `\` strips backslashes from Windows
+    // paths (C:\Users\app.jar -> C:Usersapp.jar), so on Windows parse with
+    // cmd.exe's escape character `^` instead.
+    const origArgs = shellParseArgs(
+      query.args as string,
+      undefined,
+      process.platform === "win32" ? { escape: "^" } : undefined,
+    ) as string[];
     const queryEnv = query.env ? JSON.parse(query.env as string) : {};
     const env = { ...defaultEnvironment, ...process.env, ...queryEnv };