diff --git a/apps/backend/internal/agent/agentctl/launcher/launcher.go b/apps/backend/internal/agent/agentctl/launcher/launcher.go
index 31d760b50c..4ab241ec76 100644
--- a/apps/backend/internal/agent/agentctl/launcher/launcher.go
+++ b/apps/backend/internal/agent/agentctl/launcher/launcher.go
@@ -133,13 +133,9 @@ func (l *Launcher) Start(ctx context.Context) error {
 	)
 
 	// Set process attributes:
-	// - Pdeathsig: kernel sends SIGTERM to child when parent dies (crash protection)
-	// - Setpgid: create new process group so Ctrl+C doesn't propagate directly
-	//   (we handle shutdown ourselves via Stop())
-	l.cmd.SysProcAttr = &syscall.SysProcAttr{
-		Pdeathsig: syscall.SIGTERM,
-		Setpgid:   true, // Don't inherit parent's process group
-	}
+	// - Pdeathsig on Linux: kernel sends SIGTERM to child when parent dies.
+	// - Setpgid: create new process group so Ctrl+C doesn't propagate directly.
+	l.cmd.SysProcAttr = buildSysProcAttr()
 
 	// Capture stdout and stderr
 	stdout, err := l.cmd.StdoutPipe()
@@ -332,4 +328,3 @@ func (l *Launcher) monitorExit() {
 
 	close(l.exited)
 }
-
diff --git a/apps/backend/internal/agent/agentctl/launcher/sysprocattr_default.go b/apps/backend/internal/agent/agentctl/launcher/sysprocattr_default.go
new file mode 100644
index 0000000000..abc48b1556
--- /dev/null
+++ b/apps/backend/internal/agent/agentctl/launcher/sysprocattr_default.go
@@ -0,0 +1,11 @@
+//go:build !linux
+
+package launcher
+
+import "syscall"
+
+func buildSysProcAttr() *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+}
diff --git a/apps/backend/internal/agent/agentctl/launcher/sysprocattr_linux.go b/apps/backend/internal/agent/agentctl/launcher/sysprocattr_linux.go
new file mode 100644
index 0000000000..b7c967fc5b
--- /dev/null
+++ b/apps/backend/internal/agent/agentctl/launcher/sysprocattr_linux.go
@@ -0,0 +1,12 @@
+//go:build linux
+
+package launcher
+
+import "syscall"
+
+func buildSysProcAttr() *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{
+		Pdeathsig: syscall.SIGTERM,
+		Setpgid:   true,
+	}
+}