s&box MCP Knowledgebase

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

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menu_bookDocumentation
May 5, 2026

Scene Metadata - s&box Scene Documentation

Scene Metadata You can implement the interface in any Component that has data you'd like saved to Metadata. Metadata is data that can be accessed without needin…

groupsCommunity
May 3, 2026

Project Structure Recommendations

Project Structure Recommendations Community guide for organizing s&box projects based on Facepunch examples and successful community projects. Recommended Folde…

menu_bookDocumentation
May 12, 2026

s&box ISpawnerExtensions: Creating spawner instances

ISpawnerExtensions: Creating ISpawner Instances ISpawnerExtensions provides an extension method to create ISpawner instances from type strings, supporting vario…

codeAPI Reference
May 3, 2026

Sandbox.Log

Sandbox.Log Static logging class for console output. Overview Log messages appear in the editor console, in-game console (press ), and log files. Logging Method…

menu_bookDocumentation
May 4, 2026

Sandbox: PlayerInventory — weapon slots, pickup, drop, and loadout persistence

Sandbox PlayerInventory — Weapon Slots, Pickup, Drop, and Loadout Persistence manages up to 6 weapon slots, handles pickup/drop logic, and delegates loadout sav…

codeAPI Reference
May 3, 2026

Sandbox.ParticleEffect

Sandbox.ParticleEffect Controls particle system playback. Overview ParticleEffect is the root component for playing particle effects (.vpcf files). Setup Playba…

menu_bookDocumentation
May 5, 2026

Video - s&box Media Documentation

Video s&box can decode and play video files for cutscenes, UI elements, or in-world displays. VideoPlayer The VideoPlayer decodes video and exposes frames as a …

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 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 …

menu_bookDocumentation
May 4, 2026

ISceneLoadingEvents: Async Scene Load Hooks with BeforeLoad, OnLoad, and AfterLoad

ISceneLoadingEvents: Async Scene Load Hooks Implement on a to hook into the scene loading pipeline. The game waits for async tasks to complete before proceeding…

codeAPI Reference
May 12, 2026

EmitMode enum

EmitMode Enum Controls how an emitter triggers when controlled via player input in s&box. Values Toggle Press once to turn on, press again to turn off. Hold Emi…

codeAPI Reference
May 12, 2026

Throwable enum

Throwable Enum Types of throwable weapons for s&box viewmodel animation selection. Values HEGrenade - High-explosive grenade SmokeGrenade - Smoke grenade StunGr…

codeAPI Reference
May 12, 2026

TraceAttackInfo record struct

TraceAttackInfo Record Struct Information about a trace-based attack in s&box, used to pass attack data through the weapon system. Properties Target () - The Ga…

codeAPI Reference
May 12, 2026

BulletConfiguration record struct

BulletConfiguration Record Struct Configuration for s&box bullet weapon behavior including damage, spread, and recoil. Properties Damage () - Base damage per bu…

menu_bookDocumentation
May 5, 2026

Animation - s&box Documentation

Animation s&box supports skeletal animation for characters and objects. Animate models using imported animations, blend between states, and control playback fro…

menu_bookDocumentation
May 4, 2026

Scene.Load and Scene.LoadFromFile: Loading Scenes, DontDestroyOnLoad, and the Loading Sequence

Scene.Load and Scene.LoadFromFile: Loading Scenes Locally loads a scene file into the current scene. This is a local-only operation — it does not bring other cl…

menu_bookDocumentation
May 4, 2026

ISceneStartup: OnHostPreInitialize, OnHostInitialize, OnClientInitialize — Scene Initialization Hooks

ISceneStartup: Scene Initialization Hooks for GameObjectSystems provides callbacks for scene initialization events. It is intended for implementations, not comp…

menu_bookDocumentation
May 5, 2026

Hotloading — live code reloading, IL fast path, and common pitfalls

Hotloading — Live Code Reloading s&box recompiles and live-reloads your assembly whenever you save a or file. You don't need to restart the editor for most chan…

menu_bookDocumentation
May 5, 2026

Making a Hat - s&box Clothing Documentation

Making a Hat Step-by-step guide to creating hat clothing for the Citizen character. Making Hats / Headwear Hats are worn on the head and don't need to deform wi…

terminalCode Example
May 10, 2026

Trigger-Based Background Music Crossfade Framework

This pattern replaces area music with a small local-client music framework. Each zone requests a target , while one controller crossfades the currently playing …