jointeam - нет аргументов (ноль)
jointeam 3 - (один аргумент)
jointeam 3 авыа папвф - (три аргумента)

#include <sourcemod>    
#include <cstrike>    

public OnPluginStart()    
{    
     AddCommandListener(ChooseTeam, "jointeam");      
}    

public Action:ChooseTeam(client, const String:command[], args)       
{    
     if (client == 0) return Plugin_Continue;
     if (client < 1 || args < 1) return Plugin_Handled;  
     decl String:teamString[3];    
     GetCmdArg(1, teamString, sizeof(teamString));    
     new Target_Team = StringToInt(teamString);    
     if (Target_Team == 0)    
     {    
       ClientCommand(client, "play buttons/button11.wav");
       PrintToChat(client, "\x03[nJoin] \x04Автовыбор отключен, нажми 1 или 2!");   
       return Plugin_Handled;    
     }    
     if (Target_Team == 1)    
     {    
        ClientCommand(client, "play buttons/button11.wav");
        PrintToChat(client, "\x03[nJoin] \x04Спектор отключен, нажми 1 или 2!");   
        return Plugin_Handled;         
     }     

     return Plugin_Continue;   
}