IsEnemyEntityName() returns a weird string. Not usable in a if statementf

[Trackster]

if SERVER then
    util.AddNetworkString("AttackerName")
    hook.Add("PlayerShouldTakeDamage", "AttackerName", function(ply , attacker)
        net.Start("AttackerName")
        net.WriteEntity(attacker)
        net.Send(ply)
    end)
else
    net.Receive("AttackerName",function()
        local attacker = net.ReadEntity()
        print(attacker)
        file.Write("Attacker.txt", attacker)
        if IsEnemyEntityName(attacker) then
            chat.AddText("Neurotoxin detected")
        end
    end)
end

Right now i want to add a new Feature to my newest Addon, when the player gets hit by a poison headcrap the Addon runs the chat.AddText. Or whatever else i put in there.
Like the HEV suit in Half life, or even in gmod with the message "Neurotoxin detected" and giving you some health every few seconds.

Is there a easier way to do this even?

If there isnt, here the Problem:

i printed out the attacker and even printed it in a file to see what it actually returns. The txt file stays empty, and the print returns
NPC [104][npc_headcrab_black]

not sure what of that i am supposed to put in the if statement? I tryd the whole thing, 104, npc_headcrap_black, but it never works. And since thats the only thing that gets returned as attacker, which is also the thing that gets checked im not sure what to do.

[c👌de_g🎷]

Attacker is an entity. file.Write takes a string. Use attacker:GetClass() if you just want the "npc_headcrab_black"

[Trackster]

Oh yea attacker:GetClass() works way better..
about the hook, i might try that later. Right now im still using the network code i had, just replaced the if statement with the GetClass().

Little problem wich i already noticed with the print(attacker), it prints out out twice. Same with the chat.AddText. It prints twice at the same time.
Which i simply assume, is happening because the poison headcrap attacks you twice? Or something