"a script that makes it that if I click while having a tool equipped, a sword swing happens, the animations are replacable within the script and there are working hitboxes infront of the player performing the swing"

-- local script inside the tool 
local tool = script.Parent
local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local mouse = player:GetMouse()

local swordSwingAnimation = Instance.new("Animation")
swordSwingAnimation.AnimationId = "rbxassetid://YOUR_ANIMATION_ID_HERE"

local hitbox = Instance.new("Part")
hitbox.Name = "Hitbox"
hitbox.Size = Vector3.new(5, 5, 1)
hitbox.Transparency = 1
hitbox.CanCollide = false
hitbox.Parent = character

local function onActivated()
    local swing = humanoid:LoadAnimation(swordSwingAnimation)
    swing:Play()
    
    hitbox.CFrame = character.HumanoidRootPart.CFrame * CFrame.new(0, 0, -5)
    hitbox.Touched:Connect(function(hit)
        local hitCharacter = hit.Parent
        local hitHumanoid = hitCharacter:FindFirstChild("Humanoid")
        if hitHumanoid then
            hitHumanoid.Health = hitHumanoid.Health - 10
        end
    end)
    
    wait(0.5) -- Adjust this value based on the duration of your animation
    hitbox.Touched:Disconnect()
end

tool.Activated:Connect(onActivated)

tool.Unequipped:Connect(function()
    hitbox.Parent = nil
end)

tool.Equipped:Connect(function()
    hitbox.Parent = character
end)