Add multiple event listeners to check if holding a tool?

I am making a simple gun, and to make it automatically fire I have a function connected to a doing variable to check whether or not the mouse is down for automatic fire. However, I can now shoot even without the tool equipped because I have a button1down event instead of tool.Activated How do I add multiple events to this (A tool.Activated one to make sure they are holding the gun?)

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

local M249shoot = game.ReplicatedStorage.GunFire
local BulletFolder = game.Workspace.Bullets

local debounce = false

local cooldown = 0.15
local doing = false

mouse.Button1Down:Connect(function()
    doing = true
    while doing do
        if debounce then return end
        debounce = true 

        local mousePosition = mouse.Hit.p
        local originPosition = origin.Position

        M249shoot:FireServer(mousePosition, originPosition)
        script.Parent.M249Sound:Play()

        wait(cooldown)
        debounce = false
    end
end)


mouse.Button1Up:Connect(function()
    doing = false
end)