diff --git a/src/serena/cli.py b/src/serena/cli.py
index 457b3acb..9927390c 100644
--- a/src/serena/cli.py
+++ b/src/serena/cli.py
@@ -31,6 +31,7 @@ from serena.project import Project
 from serena.tools import ToolRegistry
 from serena.util.logging import MemoryLogHandler
 from solidlsp.ls_config import Language
+from solidlsp.util.subprocess_util import subprocess_kwargs
 
 log = logging.getLogger(__name__)
 
@@ -40,18 +41,19 @@ log = logging.getLogger(__name__)
 def _open_in_editor(path: str) -> None:
     """Open the given file in the system's default editor or viewer."""
     editor = os.environ.get("EDITOR")
+    run_kwargs = subprocess_kwargs()
     try:
         if editor:
-            subprocess.run([editor, path], check=False)
+            subprocess.run([editor, path], check=False, **run_kwargs)
         elif sys.platform.startswith("win"):
             try:
                 os.startfile(path)
             except OSError:
-                subprocess.run(["notepad.exe", path], check=False)
+                subprocess.run(["notepad.exe", path], check=False, **run_kwargs)
         elif sys.platform == "darwin":
-            subprocess.run(["open", path], check=False)
+            subprocess.run(["open", path], check=False, **run_kwargs)
         else:
-            subprocess.run(["xdg-open", path], check=False)
+            subprocess.run(["xdg-open", path], check=False, **run_kwargs)
     except Exception as e:
         print(f"Failed to open {path}: {e}")
 
diff --git a/src/serena/util/shell.py b/src/serena/util/shell.py
index c899b212..59bc006f 100644
--- a/src/serena/util/shell.py
+++ b/src/serena/util/shell.py
@@ -4,6 +4,8 @@ import subprocess
 
 from pydantic import BaseModel
 
+from solidlsp.util.subprocess_util import subprocess_kwargs
+
 
 class ShellCommandResult(BaseModel):
     stdout: str
@@ -36,6 +38,7 @@ def execute_shell_command(command: str, cwd: str | None = None, capture_stderr:
         encoding="utf-8",
         errors="replace",
         cwd=cwd,
+        **subprocess_kwargs(),
     )
 
     stdout, stderr = process.communicate()
@@ -43,15 +46,7 @@ def execute_shell_command(command: str, cwd: str | None = None, capture_stderr:
 
 
 def subprocess_check_output(args: list[str], encoding: str = "utf-8", strip: bool = True, timeout: float | None = None) -> str:
-    kwargs = {
-        "stdin": subprocess.DEVNULL,
-        "stderr": subprocess.PIPE,
-        "timeout": timeout,
-        "env": os.environ.copy(),
-    }
-    if platform.system() == "Windows":
-        kwargs["creationflags"] = subprocess.CREATE_NO_WINDOW  # type: ignore
-    output = subprocess.check_output(args, **kwargs).decode(encoding)  # type: ignore
+    output = subprocess.check_output(args, stdin=subprocess.DEVNULL, stderr=subprocess.PIPE, timeout=timeout, env=os.environ.copy(), **subprocess_kwargs()).decode(encoding)  # type: ignore
     if strip:
         output = output.strip()
     return output
diff --git a/src/solidlsp/language_servers/common.py b/src/solidlsp/language_servers/common.py
index 1587d0a9..4a1fa865 100644
--- a/src/solidlsp/language_servers/common.py
+++ b/src/solidlsp/language_servers/common.py
@@ -9,6 +9,7 @@ from dataclasses import dataclass
 
 from solidlsp.ls_logger import LanguageServerLogger
 from solidlsp.ls_utils import FileUtils, PlatformUtils
+from solidlsp.util.subprocess_util import subprocess_kwargs
 
 log = logging.getLogger(__name__)
 
@@ -73,10 +74,8 @@ class RuntimeDependencyCollection:
 
     @staticmethod
     def _run_command(command: str | list[str], cwd: str) -> None:
-        kwargs = {}
-        if PlatformUtils.get_platform_id().is_windows():
-            kwargs["creationflags"] = subprocess.CREATE_NO_WINDOW  # type: ignore
-        else:
+        kwargs = subprocess_kwargs()
+        if not PlatformUtils.get_platform_id().is_windows():
             import pwd
 
             kwargs["user"] = pwd.getpwuid(os.getuid()).pw_name
diff --git a/src/solidlsp/ls_handler.py b/src/solidlsp/ls_handler.py
index 6a994ed3..f81dde53 100644
--- a/src/solidlsp/ls_handler.py
+++ b/src/solidlsp/ls_handler.py
@@ -32,6 +32,7 @@ from solidlsp.lsp_protocol_handler.server import (
     make_request,
     make_response,
 )
+from solidlsp.util.subprocess_util import subprocess_kwargs
 
 log = logging.getLogger(__name__)
 
@@ -181,6 +182,8 @@ class SolidLanguageServerHandler:
             # on Linux/macOS
             cmd = " ".join(cmd)
         log.info("Starting language server process via command: %s", self.process_launch_info.cmd)
+        kwargs = subprocess_kwargs()
+        kwargs["start_new_session"] = self.start_independent_lsp_process
         self.process = subprocess.Popen(
             cmd,
             stdout=subprocess.PIPE,
@@ -188,8 +191,8 @@ class SolidLanguageServerHandler:
             stderr=subprocess.PIPE,
             env=child_proc_env,
             cwd=self.process_launch_info.cwd,
-            start_new_session=self.start_independent_lsp_process,
             shell=True,
+            **kwargs,
         )
 
         # Check if process terminated immediately
diff --git a/src/solidlsp/util/subprocess_util.py b/src/solidlsp/util/subprocess_util.py
new file mode 100644
index 00000000..ac6a4e2b
--- /dev/null
+++ b/src/solidlsp/util/subprocess_util.py
@@ -0,0 +1,13 @@
+import platform
+import subprocess
+
+
+def subprocess_kwargs():
+    """
+    Returns a dictionary of keyword arguments for subprocess calls, adding platform-specific
+    flags that we want to use consistently.
+    """
+    kwargs = {}
+    if platform.system() == "Windows":
+        kwargs["creationflags"] = subprocess.CREATE_NO_WINDOW  # type: ignore
+    return kwargs