Sbox Mcp

sbox-mcp

> Control Facepunch's s&box engine with Claude. A plugin that lets any MCP-aware LLM client drive scenes, components, and a running game through natural language. Talk things into existence.

[](https://dotnet.microsoft.com) [](https://sbox.game) [](https://modelcontextprotocol.io)

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Features

• 🗺️ Manage projects & scenes — open, save, and navigate your scene graph from natural-language prompts.
• ✨ Spawn entities & edit world — place props, configure components, set transforms. No menu hunting.
• 🐛 Run, test & debug — drive a running game from your prompts. Spawn enemies, tweak globals, dump runtime state.
• 🛠️ Edit C# code & resources — write Component scripts, refactor existing ones, tight feedback loop with the editor's hot-reload.
• 🔌 Works with any MCP client — Claude Code, Cursor, or any LLM client speaking Model Context Protocol.

Try it

> "Place a red bouncing cube at the camera origin and make it spawn three children when clicked."

> "Write me a Component that plays a sound on overlap and attach it to the prop I have selected."

> "While the game is running, spawn 50 zombies in a circle around the player."

Get it

Coming soon to sbox.game. Watch this repo for the release announcement.

Support

If sbox-mcp saves you time, you can support continued development:

• [](https://github.com/sponsors/314159DD)
• [](https://buymeacoffee.com/314159DD)

Built with

• s&box — Facepunch's modern Source 2 + .NET 10 game engine
• Model Context Protocol — Anthropic's open standard for AI tool integration
• .NET 10 + Roslyn — runtime, codegen, and reflection

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By @314159DD.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: 314159DD
• Source: 314159DD/sbox-mcp
• License: MIT

Install and usage instructions live in the source repository linked above.