---
title: Custom text chat commands
description: Learn how to create custom chat commands.
---
`Class.TextChatService` has built-in chat commands for common purposes, such as muting other players and using avatar emotes. You can enable them by setting `Class.TextChatService.CreateDefaultCommands|CreateDefaultCommands` to `true` in Studio's **Properties** window.
You can also add custom commands using `Class.TextChatCommand`. Users sending a defined command in the chat input bar trigger a callback defined by `Class.TextChatCommand.Triggered` to perform your customized actions.
The following example shows how to create a chat command that allows players to increase or decrease their character's size when they input `/super` or `/mini`.
1. Add a `Class.TextChatCommand` instance inside `Class.TextChatService`.
2. Rename it to **SizeCommand**.
3. Set its `Class.TextChatCommand.PrimaryAlias|PrimaryAlias` property to `/super` and its `Class.TextChatCommand.SecondaryAlias|SecondaryAlias` to `/mini`.
4. Insert the following `Class.Script` inside `Class.ServerScriptService` to define a callback for the chat command that scales the character's size:
```lua title="Script" highlight="4,6"
local TextChatService = game:GetService("TextChatService")
local Players = game:GetService("Players")
local sizeCommand: TextChatCommand = TextChatService:WaitForChild("SizeCommand")
sizeCommand.Triggered:Connect(function(textSource, message)
local scaleMult = 1
local messageWords = string.split(message, " ")
if messageWords[1] == "/super" then
scaleMult = 2
elseif messageWords[1] == "/mini" then
scaleMult = 0.5
end
local player = Players:GetPlayerByUserId(textSource.UserId)
if player then
local character = player.Character
if character then
local humanoid = character:FindFirstChildWhichIsA("Humanoid")
if humanoid then
for _, child in humanoid:GetChildren() do
if child:IsA("NumberValue") then
child.Value *= scaleMult
end
end
end
end
end
end)
```