diff --git a/cmd/frostfs-adm/internal/modules/morph/subnet.go b/cmd/frostfs-adm/internal/modules/morph/subnet.go
index f289400ab4..95fa9e350b 100644
--- a/cmd/frostfs-adm/internal/modules/morph/subnet.go
+++ b/cmd/frostfs-adm/internal/modules/morph/subnet.go
@@ -307,8 +307,6 @@ const (
 )
 
 // common executor cmdSubnetAdminAdd and cmdSubnetAdminRemove commands.
-//
-// nolint: funlen
 func manageSubnetAdmins(cmd *cobra.Command, rm bool) error {
 	// read private key
 	var key keys.PrivateKey
@@ -341,17 +339,19 @@ func manageSubnetAdmins(cmd *cobra.Command, rm bool) error {
 		return fmt.Errorf("admin key format: %w", err)
 	}
 
-	// prepare call parameters
+	return invokeMethodWithParams(cmd, id, rm, binAdminKey, key)
+}
+
+func invokeMethodWithParams(cmd *cobra.Command, id subnetid.ID, rm bool, binAdminKey []byte, key keys.PrivateKey) error {
 	prm := make([]any, 0, 3)
 	prm = append(prm, id.Marshal())
 
 	var method string
 
 	if viper.GetBool(flagSubnetAdminClient) {
-		// read group ID and encode it
 		var groupID internal.SubnetClientGroupID
 
-		err = groupID.UnmarshalText([]byte(viper.GetString(flagSubnetAdminAddGroup)))
+		err := groupID.UnmarshalText([]byte(viper.GetString(flagSubnetAdminAddGroup)))
 		if err != nil {
 			return fmt.Errorf("decode group ID text: %w", err)
 		}
@@ -378,7 +378,7 @@ func manageSubnetAdmins(cmd *cobra.Command, rm bool) error {
 
 	prm = append(prm, binAdminKey)
 
-	err = invokeMethod(key, false, method, prm...)
+	err := invokeMethod(key, false, method, prm...)
 	if err != nil {
 		return fmt.Errorf("morph invocation: %w", err)
 	}