s&box MCP Knowledgebase

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

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codeAPI Reference
May 4, 2026

s&box TimeSince and TimeUntil: Convenient Time Measurement Structs

s&box TimeSince and TimeUntil: Convenient Time Measurement Structs Both structs use internally and support implicit conversion from /. TimeSince Measures time e…

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

[Sync] Attribute: SyncFlags.FromHost, SyncFlags.Interpolate, SyncFlags.Query — How Property Sync Works

[Sync] Attribute: SyncFlags and How Property Synchronization Works The attribute marks a component property for automatic network synchronization from the owner…

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

FixedUpdate Internals: Step Counting, Spiral of Death Prevention, Time.Scope, and ApplyForce vs ApplyImpulse

FixedUpdate Internals: How the Fixed Timestep Works in s&box The s&box fixed update system uses a step-counting approach rather than accumulating time. This is …

menu_bookDocumentation
May 4, 2026

SyncFlags.Interpolate: How Networked Property Interpolation Works — Supported Types, InterpolationBuffer, and Delay

SyncFlags.Interpolate: How Networked Property Interpolation Works When is applied to a property, proxy clients receive a smoothed value between network ticks ra…

menu_bookDocumentation
May 20, 2026

UI Style Properties: CSS Reference with Custom Pseudo-Classes and Sound Events

s&box UI styling follows web CSS conventions with some differences. Everything is flex by default. Key custom properties include / for hover/click sounds, , and…

menu_bookDocumentation
May 3, 2026

Editor Widgets

Editor Widgets Build custom editor UI using Widgets (different from in-game Panels). Creating a Widget Widget as Window Widget as Child Dockable Widget Asset Ed…

menu_bookDocumentation
May 20, 2026

Shader Graph Getting Started: Visual Shader Editor in s&box

s&box Shader Graph is a visual scripting language that compiles to shader code. Accessible to beginners and useful for rapid prototyping by experienced shader d…

menu_bookDocumentation
May 4, 2026

s&box Component Lifecycle: Exact Execution Order and Internal Guards

s&box Component Lifecycle: Exact Execution Order and Internal Guards Derived directly from and in the s&box engine source. Execution Order **** — Called once wh…

menu_bookDocumentation
May 4, 2026

Component Lifecycle: Full Callback Order — OnAwake, OnEnabled, OnStart, OnUpdate, OnFixedUpdate, OnDisabled, OnDestroy

Component Lifecycle: Full Callback Order s&box components have a well-defined lifecycle. Understanding the exact order prevents subtle bugs. Callback Order Key …

menu_bookDocumentation
May 4, 2026

PlayerController: Architecture, Ground Detection, Jump System, WishVelocity Sync, and Physics Step Integration

PlayerController: Architecture, Ground Detection, and Jump System is the built-in s&box character movement component. It uses a internally and implements to hoo…