s&box MCP Knowledgebase

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

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menu_bookDocumentation
May 4, 2026

s&box SceneNetworkSystem: Scene Loading and Snapshot Protocol

s&box SceneNetworkSystem: Scene Loading and Snapshot Protocol is the core networking system that manages scene loading, object spawning, and snapshot synchroniz…

codeAPI Reference
May 3, 2026

PlayerData Component for Stats and Respawn

PlayerData Component Persistent player data component tracking stats (kills, deaths), respawn state, and providing connection lookup. Key Properties Connection …

menu_bookDocumentation
May 4, 2026

s&box Easing Functions: Sandbox.Utility.Easing — Quadratic, Exponential, Bounce, Sine, and CSS-Style Name Lookup

s&box Easing Functions: Sandbox.Utility.Easing for Transitions and Animations provides standard easing functions used throughout s&box's UI system and available…

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

Prefabs - s&box Documentation

Prefabs Prefabs are reusable GameObject templates that allow you to create consistent, repeatable objects across your game. You create a prefab asset from a Gam…

codeAPI Reference
May 12, 2026

s&box AmmoInventory: Shared ammo pools

AmmoInventory Component API Reference AmmoInventory stores shared ammo pools on a player, keyed by AmmoResource. Add this component to the player prefab alongsi…

menu_bookDocumentation
May 5, 2026

Clothing - s&box Assets Documentation

Clothing The clothing system allows players to customize their Citizen character with various wearable items. Create hats, shirts, pants, accessories, and more.…

menu_bookDocumentation
May 4, 2026

SceneAnimationSystem: Threaded Animation, Bone Merge Order, Procedural Bones, and Ragdoll Physics Step

SceneAnimationSystem: Threaded Animation Updates and Bone Merge Order drives all animation updates. It runs at (after , before ). Threading Model Animation upda…

terminalCode Example
May 11, 2026

UIDecal Component - Render Razor UI as a Decal

A Render Component for s&box that allows you to project Razor UI onto surfaces as a Decal. Great for sticking UI onto rounded walls, curved surfaces, or any geo…

codeAPI Reference
May 3, 2026

Sandbox.Color

Sandbox.Color RGBA color representation. Overview Color stores red, green, blue, and alpha values (0-1 range). Creation Named Colors Components Operations To/Fr…

codeAPI Reference
May 12, 2026

s&box Tracer: Projectile trail renderer

Tracer Renderer Component API Reference Tracer is a Renderer component that creates a tracer effect (like bullet trails) that travels from its world position to…

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…

codeAPI Reference
May 12, 2026

s&box CombatNpc: Combat NPC

CombatNpc Class API Reference CombatNpc is a combat NPC that searches for players, advances on them, fires in bursts, and repositions. When friendly, follows pl…

menu_bookDocumentation
May 20, 2026

Component Versioning: JsonUpgrader for Scene and Prefab Migration

s&box component versioning uses attributes and the property to migrate serialized scene/prefab data when you make breaking changes to component properties. This…

menu_bookDocumentation
May 5, 2026

Playing Sounds - s&box Sound Documentation

Playing Sounds s&box provides multiple ways to play audio. From simple one-shots to complex 3D spatial audio with full control. SoundEvent Create reusable sound…

menu_bookDocumentation
May 5, 2026

Reporting Errors - s&box Documentation

Reporting Errors How to report bugs and issues with s&box. Issue Tracker Report bugs on the s&box issue tracker: Search existing issues first Create a new issue…

menu_bookDocumentation
May 5, 2026

Libraries - s&box Code Documentation

Libraries Libraries are reusable code packages you can share between projects or distribute to others. They provide a way to modularize your code and avoid dupl…

terminalCode Example
May 12, 2026

UndoSystem: Per-player undo functionality

UndoSystem: Per-Player Undo Functionality This example shows the UndoSystem which provides per-player undo stacks for tracking spawned objects and allowing play…

terminalCode Example
May 3, 2026

Inventory Hotbar UI Component

Inventory HUD with Hotbar A Razor PanelComponent that displays player inventory slots as a hotbar with mouse wheel and number key support. Implementation Key Fe…

menu_bookDocumentation
May 5, 2026

Mapping - s&box Editor Documentation

Mapping s&box includes Hammer, the Source 2 level editor, for creating maps and environments. Build worlds with brushes, props, lighting, and gameplay entities.…