s&box MCP Knowledgebase

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

library_books 595 entries menu_book 352 Documentation code 133 API Reference terminal 100 Code Example groups 10 Community
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menu_bookDocumentation
May 20, 2026

Custom GameResource Assets: Define, Create, and Access Custom Asset Types

Define custom asset types as subclasses. They get a nice inspector window, are hotloaded in-game, and are stored as JSON files with a custom extension. Creating…

codeAPI Reference
May 3, 2026

Sandbox.GameResource

Sandbox.GameResource Base class for custom asset types. Overview GameResource is the base class for creating custom asset types that appear in the editor with f…

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…

menu_bookDocumentation
May 20, 2026

File System: Sandboxed Virtual Filesystems for Data Persistence

Standard .NET access is restricted in s&box. Instead, use the provided virtual filesystems that sandbox access to specific game directories. Available File Syst…

menu_bookDocumentation
May 20, 2026

Leaderboard Web API: Public REST Endpoint with Aggregation and Filtering

The s&box leaderboard Web API is publicly accessible for querying player rankings based on stats. Endpoint Parameters stat — stat name to base the leaderboard o…

menu_bookDocumentation
May 20, 2026

Binary Serialization: BlobData for Large GameResource Data Storage

When JSON files grow too large in s&box, you can store data as a binary blob using the class. This works with GameResource assets and provides custom serializat…

menu_bookDocumentation
May 20, 2026

Dedicated Server User Permissions: Claims-Based Access Control via Steam ID

On s&box Dedicated Servers, you can specify admin permissions per user via the file using Steam IDs and claims. Configuration Claims Claims are strings describi…

menu_bookDocumentation
May 5, 2026

Code Basics - s&box Documentation

Code Basics C# is the primary programming language for s&box. The engine uses modern .NET with hotloading support, allowing you to see code changes instantly wi…

menu_bookDocumentation
May 4, 2026

FileSystem: Mounted, Data, OrganizationData, Cache, and Memory Filesystems

FileSystem: Accessing Game Files in s&box s&box provides several filesystem access points through the static class. Available Filesystems Reading and Writing Fi…

groupsCommunity
May 4, 2026

Sandbox: Full codebase architecture — systems, player components, weapons, tools, NPCs

Sandbox Codebase Architecture Overview The Facepunch Sandbox game is a large reference implementation. Here's a map of the major systems and how they connect. C…

menu_bookDocumentation
May 4, 2026

TextRenderer: 3D World Text, TextScope, Localization via # Prefix, Scale vs FontSize, and JsonUpgrader Pattern

TextRenderer: 3D World Text with Localization Support renders text in 3D world space using for font configuration. Basic Usage TextScope The property controls a…