Sbox

Use when writing or modifying code for s&box, sbox, the Facepunch sandbox engine, or any Source 2 game project in C#. Triggers on mentions of s&box, sbox, sandbox game, Facepunch engine, Source 2 game, `.sbproj`, `.razor` with `PanelComponent`, `@inherits PanelComponent`, `Sandbox.Component`, `GameObject` + `Components.Get<T>`, `Scene.Trace`, `CharacterController` + `.Move()`, `SkinnedModelRenderer`, `NavMeshAgent`, `[Sync]`, `[Rpc.Broadcast]`, `[Property]`, `INetworkListener`, `ISceneEvent`, `PlayerController` in C#. Also triggers on any file with `using Sandbox;` or `using Sandbox.UI;` that

45 stars 5 forksFrontend & Design

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add gavogavogavo/claude-sbox --skill sbox

Manual install

git clone --depth 1 https://github.com/gavogavogavo/claude-sbox.git /tmp/claude-sbox
mkdir -p ~/.claude/skills
cp -r /tmp/claude-sbox/. ~/.claude/skills/sbox

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# s&box Skill — Router

## READ BEFORE WRITING CODE

**s&box is not Unity.** `MonoBehaviour`, `Start()`, `Update()`, `GetComponent<T>()` call sites, `Instantiate()`, `Destroy(gameObject)`, `Debug.Log`, `[SerializeField]`, `Input.GetKey()`, `Physics.Raycast` — **none of these exist**. If you write any of them you have hallucinated.

s&box is a C# scripting layer on Source 2 by Facepunch. The scene system uses `GameObject` + `Component` with a different lifecycle, a different networking model, and a different API surface. The API schema in `references/api-schema-core.md` is ground truth; if anything in this skill contradicts the schema, the schema wins.

**Before you write a single line of s&box code, open the relevant reference file.** SKILL.md is a router — it points you at the answer, it does not contain the answer. Writing a component? Open `references/core-concepts.md`. Writing UI? Open `references/ui-razor.md`. No exceptions for "simple" tasks — your muscle memory is wrong.

---

## Architecture in 30 Seconds

```
Scene (is-a GameObject — the root)
  └── GameObject (transform, tags, children, components)
        └── Component (all gameplay code extends this)
```

- **All gameplay code** is a `sealed class` extending `Sandbox.Component`.

Read the full skill on GitHub

Details

Skill name: sbox
Repository: gavogavogavo/claude-sbox
License: MIT
Repo updated: 23 June 2026

FAQ

What does the Sbox skill do?

How do I install the Sbox skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add gavogavogavo/claude-sbox --skill sbox. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Sbox popular?

It lives in gavogavogavo/claude-sbox, which has 45 GitHub stars and 5 forks.

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