Q. You were saying that any "agent" that is not WGA signatory can't help you and that they may hurt you.
Can you tell me how is it that they can hurt you?
First of all, an agent who isn't signatory with the Guild is likely an agent no one in showbiz has ever heard of. That means producers are likely to be uninterested in reading material from them.
Second, the WGA has a slew of rules about what agents can and can't do, like charge for coverage. (The State of California has other rules about what agents can and can't do, like produce.) If this non-WGA agent isn't willing to sign with the Guild, then I have to wonder: exactly what is it they want to do to you that the Guild agreement wouldn't let them do?