roblox-security
Use when writing Roblox game scripts that handle player actions, currencies, stats, damage, or any RemoteEvent/RemoteFunction communication. Use when reviewing code for exploitable patterns, implementing anti-cheat logic, validating client requests on the server, or setting up rate limiting.
- Installs
- 712
- Last 24h
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- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/sentinelcore/roblox-skills --skill roblox-security- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads roblox-security automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Roblox Security: Anti-Exploit & Server-Side Validation
Core Principle
Never trust the client. Every LocalScript runs on the player's machine and can be modified. All authoritative logic — damage, currency, stats, position changes — must live on the server.
FilteringEnabled is always on in modern Roblox. Client-side changes do not replicate to the server or other clients unless the server explicitly applies them.
Secure vs Insecure Patterns
| Pattern | Insecure | Secure |
|---|---|---|
| Dealing damage | LocalScript sets Humanoid.Health | Server reduces health after validation |
| Awarding currency | LocalScript increments leaderstats | Server validates action, then increments |
| Leaderstats ownership | LocalScript owns the IntValue | Server creates and owns all leaderstats |
| Position changes | LocalScript teleports character | Server validates and moves character |
| Tool use | Client fires damage on hit | Server raycasts and applies damage |
| Cooldowns | Client tracks cooldown locally | Server tracks cooldown per player |
Secure Leaderstats Setup
-- Script in ServerScriptService — never LocalScript
game.Players.PlayerAdded:Connect(function(player)
local leaderstats = Instance.new("Folder")
leaderstats.Name = "leaderstats"
leaderstats.Parent = player
local coins = Instance.new("IntValue")
coins.Name = "Coins"
coins.Value = 0
coins.Parent = leaderstats
end)
Server-Side Sanity Checks
Distance Check
local MAX_INTERACT_DISTANCE = 10
InteractRemote.OnServerEvent:Connect(function(player, targetPart)
if typeof(targetPart) ~= "Instance" or not targetPart:IsA("BasePart") then return end
local root = player.Character and player.Character:FindFirstChild("HumanoidRootPart")
if not root then return end
if (root.Position - targetPart.Position).Magnitude > MAX_INTERACT_DISTANCE then
warn(player.Name .. " sent interaction from invalid distance")
return
end
processInteraction(player, targetPart)
end)
Cooldown Validation
local ABILITY_COOLDOWN = 5
local lastUsed = {}
UseAbilityRemote.OnServerEvent:Connect(function(player)
local now = os.clock()
if now - (lastUsed[player] or 0) < ABILITY_COOLDOWN then return end
lastUsed[player] = now
applyAbility(player)
end)
game.Players.PlayerRemoving:Connect(function(player)
lastUsed[player] = nil
end)
Stat Bounds Check
local MAX_QUANTITY = 99
local ITEM_COST = 50
BuyItemRemote.OnServerEvent:Connect(function(player, quantity)
if type(quantity) ~= "number" then return end
quantity = math.clamp(math.floor(quantity), 1, MAX_QUANTITY)
local coins = player.leaderstats.Coins
if coins.Value < ITEM_COST * quantity then return end
coins.Value = coins.Value - (ITEM_COST * quantity)
-- award items server-side
end)
Rate Limiting
local RATE_LIMIT = 10 -- max calls
local RATE_WINDOW = 1 -- per second
local callLog = {}
local function isRateLimited(player)
local now = os.clock()
local log = callLog[player] or {}
local pruned = {}
for _, t in ipairs(log) do
if now - t < RATE_WINDOW then table.insert(pruned, t) end
end
if #pruned >= RATE_LIMIT then
callLog[player] = pruned
return true
end
table.insert(pruned, now)
callLog[player] = pruned
return false
end
ActionRemote.OnServerEvent:Connect(function(player)
if isRateLimited(player) then return end
handleAction(player)
end)
game.Players.PlayerRemoving:Connect(function(player)
callLog[player] = nil
end)
Argument Validation Utility
-- ServerScriptService/Modules/Validate.lua
local Validate = {}
function Validate.number(value, min, max)
if type(value) ~= "number" then return false end
if value ~= value then return false end -- NaN check
if min and value < min then return false end
if max and value > max then return false end
return true
end
function Validate.instance(value, className)
if typeof(value) ~= "Instance" then return false end
if className and not value:IsA(className) then return false end
return true
end
function Validate.string(value, maxLength)
if type(value) ~= "string" then return false end
if maxLength and #value > maxLength then return false end
return true
end
return Validate
-- Usage
local Validate = require(script.Parent.Modules.Validate)
remote.OnServerEvent:Connect(function(player, amount, targetPart)
if not Validate.number(amount, 1, 100) then return end
if not Validate.instance(targetPart, "BasePart") then return end
-- safe to proceed
end)
Speed / Anti-Cheat Detection
local SPEED_LIMIT = 32
local violations = {}
task.spawn(function()
while true do
task.wait(2)
for _, player in ipairs(game.Players:GetPlayers()) do
local root = player.Character and player.Character:FindFirstChild("HumanoidRootPart")
if root and root.AssemblyLinearVelocity.Magnitude > SPEED_LIMIT then
violations[player] = (violations[player] or 0) + 1
if violations[player] >= 3 then
player:Kick("Cheating detected.")
end
else
violations[player] = math.max(0, (violations[player] or 0) - 1)
end
end
end
end)
ModuleScript Placement
ServerScriptService/
Modules/
DamageCalculator.lua -- server-only, never exposed to client
EconomyManager.lua -- server-only
ReplicatedStorage/
Remotes/ -- RemoteEvent/RemoteFunction instances only
SharedModules/ -- non-sensitive utilities only
Never put currency, damage, or DataStore logic in ReplicatedStorage modules — clients can require() them.
Common Mistakes
| Mistake | Why It's Exploitable | Fix |
|---|---|---|
FireServer(damage) with server trusting it | Client sends any value | Server calculates damage from its own tool data |
| Currency in LocalScript variable | Client can modify memory | Server-owned only |
| Client-side distance check before firing | Check is bypassable | Server re-checks after receiving event |
| No cooldown on RemoteEvent handlers | Spam = infinite resources | Per-player cooldown on server |
Trusting WalkSpeed set by client | Client sets arbitrarily high | Server owns and caps WalkSpeed |
| Sensitive logic in ReplicatedStorage module | Clients can require it | Move to ServerScriptService |
FAQ
What does the roblox-security skill do?
Use when writing Roblox game scripts that handle player actions, currencies, stats, damage, or any RemoteEvent/RemoteFunction communication. Use when reviewing code for exploitable patterns, implementing anti-cheat logic, validating client requests on the server, or setting up rate limiting.
How do I install roblox-security?
Run npx skills add https://github.com/sentinelcore/roblox-skills --skill roblox-security in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/roblox-security/ (personal) or .claude/skills/roblox-security/ (project).
Which AI agents can use roblox-security?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is roblox-security safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains roblox-security?
It is published by sentinelcore in sentinelcore/roblox-skills. It has 712 recorded installs.
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