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Arenula MCP

Arenula MCP

by Nyx000
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Arenula (retired)

This project is retired and the repository is archived. Use the MCP server that ships with s&box instead: see the official MCP Server docs.

Why

The s&box editor has shipped its own MCP server since engine build 26.07.08. Since build 26.10.13, agents connect to it through sbox-cli, which ships with every s&box install in <engine>/bin/managed/. Its tools cover scenes, components, assets, Hammer maps, play mode, the console, compile results and screenshots, and projects can add their own tools with the [McpTool] attribute, so this project's editor plugin is no longer needed.

Related MCP server: sbox-mcp-documentation

Moving over

  1. Remove this project's entries from your MCP client config (.mcp.json in your s&box project, or wherever you added them): editor (SSE on http://localhost:8098/sse), api and docs.

  2. Delete the editor plugin from your project: Libraries/arenula_mcp/.

  3. Register sbox-cli with your client, from your project folder, while the editor has the project open. For Claude Code:

    claude mcp add sbox -- "<engine>/bin/managed/sbox-cli.exe" --connect

    <engine> is the folder containing sbox.exe. Other MCP clients run the same command as a stdio server. The editor accepts connections unless Project Settings > AI > Enable MCP Communication is off.

  4. Only a few entry points are listed up front; agents find the rest with search_tools.

For the agent instructions that ship with the engine, run sbox-cli --skill. The docs page covers writing your own tools; at the time of writing, its connection steps still describe the fixed-port HTTP server that build 26.10.13 replaced with sbox-cli.

Where each part went

This repo offered

Use now

Editor tools (editor/)

The first-party MCP server, through sbox-cli

Docs server (docs/)

The official docs, which serve markdown; index at https://sbox.game/llms.txt

API server (api/)

The official API reference at https://sbox.game/api

Schema generator (schemagen/)

Stays in this repo, unmaintained

The code

The code stays here, unmaintained, for reference, under the existing licences (GPL-3.0 for the editor plugin, MIT for the API, docs and schemagen; see LICENSE, which also records where each part came from).

The previous README is in the git history at d61fa75: README.md at d61fa75.

Credits

Licence terms for each part: LICENSE.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

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