s&box MCP Knowledgebase

Documentation, API references, code examples and community knowledge for s&box development.

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terminalCode Example
May 18, 2026

Randomized Clothing for NPC Citizens using Dresser.Randomize() on Prefabs

Overview This demonstrates how to create NPC citizen prefabs with randomized clothing using the built-in component. Each time the prefab spawns or is enabled, i…

menu_bookDocumentation
May 5, 2026

Download & Install - s&box Documentation

Download & Install Install Purchase s&box on Steam Install it via your Steam Library Launch s&box Launch After launching s&box, you will be presented with a men…

menu_bookDocumentation
May 5, 2026

Storage UGC - s&box Assets Documentation

Storage UGC The Storage system manages user-generated content. Save games, player creations, and share to Steam Workshop. Creating a New Entry Create a storage …

terminalCode Example
May 10, 2026

s&box JSONObject Save Data Helper for Components

This s&box-focused sample shows how to programmatically construct and deconstruct JSON for component save data. It is useful for player saves, world unlock stat…

menu_bookDocumentation
May 4, 2026

ClothingContainer: Apply, ApplyAsync, CreateFromConnection, RemoveUnownedItems, and Body Group Masking

ClothingContainer: Avatar Dressing System — Apply, CreateFromConnection, and RemoveUnownedItems manages a player's avatar outfit. It handles clothing compatibil…

menu_bookDocumentation
May 20, 2026

Localization: Token-Based Multi-Language UI Text in s&box

s&box supports localization through token-based string replacement. Any displayed string beginning with is recognized as a localization token and replaced with …

menu_bookDocumentation
May 5, 2026

Achievements - s&box Services Documentation

Achievements s&box provides an achievements system that integrates with Steam. Achievements can be unlocked automatically based on stats or manually via code. S…

terminalCode Example
May 3, 2026

Nameplate Component with Voice Activity

Nameplate with Voice Activity A Razor component that displays player nameplates above characters with voice chat visualization. Implementation SCSS Example Key …

menu_bookDocumentation
May 5, 2026

Testing Multiplayer - s&box Networking Documentation

Testing Multiplayer s&box provides tools for testing multiplayer locally without needing multiple computers or Steam accounts. New Instance Launch a second game…

codeAPI Reference
May 3, 2026

Sandbox.Storage

Sandbox.Storage Save and load player data. Overview Storage provides persistent storage for player data, save games, and settings with automatic Steam Cloud syn…

menu_bookDocumentation
May 4, 2026

Engine Frame Loop Order: FrameStart, Scene Tick, and FrameEnd Sequence

Engine Frame Loop Order The s&box engine frame loop runs in a specific order each frame. Understanding this is important for knowing when your code runs relativ…

menu_bookDocumentation
May 4, 2026

Networking State in s&box: IsHost, IsClient, IsActive, and Lobby Management

Networking State in s&box: IsHost, IsClient, IsActive Understanding the networking state is critical for writing correct multiplayer code in s&box. Key Properti…

terminalCode Example
May 10, 2026

Extensible Player Data Save Hooks for World Components

This pattern lets gameplay components plug into a player's save/load flow without putting every feature directly inside one large class. The framework has three…

menu_bookDocumentation
May 4, 2026

ScreenPanel and WorldPanel: AutoScale Strategies, ZIndex, LookAtCamera, and Interaction Range

ScreenPanel and WorldPanel: UI Components in s&box Scenes ScreenPanel is the root component for 2D screen-space UI. It renders attached children to the screen. …

codeAPI Reference
May 12, 2026

s&box IKillSource: Kill feed attacker interface

IKillSource Interface API Reference IKillSource is an interface for Components that can appear as an attacker in the kill feed. Implement on Player, Npc, explos…

menu_bookDocumentation
May 5, 2026

Getting Started - s&box Documentation

Getting Started S&box is coded in C#. Under the hood, it uses the Source 2 engine (CS2, HL:Alyx, DOTA2) and some of its systems: rendering, resources, physics, …

menu_bookDocumentation
May 20, 2026

Localization: Multi-Language Token System for UI Text

s&box supports localization via JSON token files. Any displayed string beginning with is treated as a localization token and automatically replaced with the use…

menu_bookDocumentation
May 20, 2026

Platform Chat - Built-in Multiplayer Text Chat System

Built-in text chat for multiplayer games. Messages are routed through the host, validated, filtered, and displayed via the standard overlay UI - no game code re…

menu_bookDocumentation
May 20, 2026

Game Mounts: Creating Custom Asset Mounts for External Games

The s&box mount system is extensible — anyone can write a mount to add support for a new game or engine. A mount detects a game's install directory via Steam, s…

menu_bookDocumentation
May 20, 2026

WebSockets: External Server Communication with Auth Token Support

s&box allows WebSocket connections to interface with external servers. Common uses include custom networking and persistent data storage outside the local files…