s&box MCP Knowledgebase

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

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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…

menu_bookDocumentation
May 12, 2026

s&box NpcConVars: Global NPC AI settings

NpcConVars Static Class NpcConVars is a static class that defines console variables controlling global NPC AI behavior in s&box. These ConVars can be set via co…

terminalCode Example
May 12, 2026

s&box DemoRecording with DefaultMovieRecorderOptions

s&box DemoRecording with DefaultMovieRecorderOptions This example shows how to configure s&box's MovieRecorder system using the [DefaultMovieRecorderOptions] at…

terminalCode Example
May 12, 2026

GameObject.FindNetworkRoot() extension method

GameObject.FindNetworkRoot() Extension Method This example shows an extension method for finding the network root of a GameObject hierarchy. Usage Example Key F…

menu_bookDocumentation
May 12, 2026

s&box HUD: UI scale factor

HUD Static Class HUD is an internal static class that provides a scale factor for UI elements based on screen resolution. It ensures UI elements scale proportio…

menu_bookDocumentation
May 3, 2026

VR Development

VR Development Build virtual reality experiences with OpenXR support, tracked devices, and VR-specific components. Setup Enable VR in your project settings. s&b…

codeAPI Reference
May 12, 2026

s&box ScriptedEntity: Custom entity GameResource

ScriptedEntity GameResource API Reference ScriptedEntity is a GameResource that defines a spawnable entity with a prefab, used by the spawn menu to create custo…

codeAPI Reference
May 12, 2026

s&box PostProcessResource: Post-processing effect GameResource

PostProcessResource GameResource API Reference PostProcessResource is a GameResource that defines a post-processing effect with a prefab, used by the PostProces…

menu_bookDocumentation
May 20, 2026

Video: VideoPlayer Decoding and VideoWriter Encoding with Streaming Support

s&box provides VideoPlayer for decoding video and VideoWriter for encoding video frames. VideoPlayer Decodes video files or URLs, exposing the current frame as …

menu_bookDocumentation
May 5, 2026

Texture Generators - s&box Editor Documentation

Texture Generators Create procedural textures in code. Generate textures from shapes, gradients, text, or any algorithm. Creating a Generator Inherit from : Pro…

menu_bookDocumentation
May 3, 2026

Media Support - Video and Audio Codecs

Media Support - Video and Audio Codecs Video and audio codec/format support for playback, streaming, and encoding. Video Codecs Recommendation: Use VP9 or AV1 f…

codeAPI Reference
May 12, 2026

s&box BalloonDefinition: Balloon type GameResource

BalloonDefinition GameResource API Reference BalloonDefinition is a GameResource that defines a balloon type with a prefab, used by the Balloon tool to spawn ba…

codeAPI Reference
May 12, 2026

s&box BasePickup: Pickup item base

BasePickup Abstract Class API Reference BasePickup is an abstract Component for items that can be picked up by players. Implements ITriggerListener and ICollisi…

menu_bookDocumentation
May 5, 2026

NetworkHelper — quick multiplayer setup with auto-server and player spawning

NetworkHelper — Quick Multiplayer Setup is a built-in s&box component that handles the boilerplate of starting a server and spawning players. It's the fastest w…

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…

codeAPI Reference
May 12, 2026

s&box LineDefinition: Trail line resource

LineDefinition GameResource API Reference LineDefinition is a GameResource for trail line definitions used by the Trail tool. It implements IDefinitionResource …

codeAPI Reference
May 12, 2026

s&box SaveSystem: Scene save/load

SaveSystem GameObjectSystem API Reference SaveSystem is a saving/loading system that captures the differences between the current scene state and the original s…

menu_bookDocumentation
May 5, 2026

Citizen Characters - s&box Assets Documentation

Citizen Characters The Citizen is s&box's default human character model. It provides a standardized base for player characters, NPCs, and customization through …

codeAPI Reference
May 12, 2026

s&box IToolInfo: Tool information display interface

IToolInfo API Reference IToolInfo is an interface for providing tool information display in the UI, such as in the spawn menu or tool selector. Type Signature P…

codeAPI Reference
May 12, 2026

s&box ToolAction: Toolgun input binding

ToolAction Enums and ToolActionEntry API Reference ToolInput, InputMode, and ToolActionEntry are used by the toolgun system to bind actions to input slots with …