Claude Sbox

claude-sbox

A [Claude Code](https://code.claude.com) skill that teaches Claude to write idiomatic [s&box](https://sbox.game) code — C# components, Razor UI, physics, and networking — without falling back on Unity patterns.

s&box is Facepunch's Source 2 game engine with a C# scripting layer. Its API, lifecycle, and networking model are *nothing like* Unity's, which means stock Claude hallucinates constantly: `void Start()`, `GetComponent()` in the Unity sense, `Physics.Raycast`, `[SerializeField]`, `StartCoroutine` — all wrong in s&box. This skill loads when you're writing s&box code and redirects Claude to the correct APIs, verified against the engine's exported schema.

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Install

**Personal (available across all your projects):**

mkdir -p ~/.claude/skills
git clone https://github.com/gavogavogavo/claude-sbox ~/.claude/skills/sbox

**Project-local (this game only):**

cd my-sbox-game
mkdir -p .claude/skills
git clone https://github.com/gavogavogavo/claude-sbox .claude/skills/sbox

Claude Code picks up skill file changes live. However, if `~/.claude/skills/` did not exist when your Claude Code session started (i.e. this is your first personal skill), you need to **restart Claude Code** after the `mkdir` so the watcher registers the new directory.

**Why the `sbox` (not `claude-sbox`) directory name?** The `name:` frontmatter in `SKILL.md` is `sbox`, which becomes the `/sbox` slash command. Cloning into `~/.claude/skills/sbox/` keeps the directory name and the invocation name in sync.

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Verify it's working

In any Claude Code session, type:

/sbox

The router loads. Alternatively, ask a triggering question and watch Claude reach for a reference file:

How do I write a networked player controller in s&box?

Claude should open `references/core-concepts.md`, `references/networking.md`, and/or `references/patterns-and-examples.md` before answering — *that's the signal the skill is working*. If it answers from