How can I modify this script so npcs summoned by you can fight for you via tool?

Hello! I want to modify this script so that when you summon NPCS via a tool the said NPCS will fight for you, like the zombie staff

Script:

--Services--
local Players = game:GetService("Players");
local RunService = game:GetService("RunService");
local PathFindingService = game:GetService("PathfindingService");

--Varibles--
local Character = script.Parent;
local Humanoid = Character.Humanoid;
local RootPart = Character.HumanoidRootPart;

local CanJump = true;

local AttackRange = Vector3.new(3,3,3);
local FieldOfView = 70;
local CharacterSize = Character:GetExtentsSize();

local PathParams = {
    AgentRadius = (CharacterSize.X+CharacterSize.Z)/4,
    AgentHight = CharacterSize.Y,
    AgentCanJump = CanJump,
};
--Functions--
local function GetNearestPlayer()
    local players = {};
    local nearest = math.huge;
    local target = nil;

    for _, player in pairs(Players:GetPlayers()) do
        local character = player.Character;

        if character == nil then
            continue;
        end;

        local distance = (character.HumanoidRootPart.Position - RootPart.Position);
        if distance.Magnitude <= FieldOfView then
            table.insert(players,{
                Magnitude = distance.Magnitude,
                Player = player,
            });
        end;
    end;
    for _, entry in pairs(players) do
        local magnitude = entry.Magnitude;
        local Player = entry.Player;

        if magnitude < nearest then
            nearest = magnitude;
            target = Player;
        end;
    end;

    return target;
end
--Connections--
RunService.Heartbeat:Connect(function()
    local player = GetNearestPlayer();

    local player_character = player.Character;

    if player_character == nil then
        return;
    end;

    local Character_Humnoid = player_character.Humanoid
    if Character_Humnoid.Health <= 0 then
        return;
    end;

    local Target_RootPart = player_character.HumanoidRootPart;

    local Destination = Target_RootPart.Position;
    local Beginning = RootPart.Position;

    local path = PathFindingService:CreatePath(PathParams);
    path:ComputeAsync(Beginning,Destination);

    if path.Status == Enum.PathStatus.Success then
        local Waypoints = path:GetWaypoints();

        for _, Waypoint in pairs(Waypoints) do
            if Waypoint.Action == Enum.PathWaypointAction.Jump then
                Humanoid.Jump = true;
            end;

            Humanoid:MoveTo(Waypoint.Position);
            Humanoid.MoveToFinished:Wait();
        end;
    else
        Humanoid:MoveTo(RootPart.Position);
    end;
end);

--Initilization--
RootPart:SetNetworkOwner(nil);