CrystalBattle Unity MCP

This local MCP server exposes selected CrystalBattle Unity Editor commands to Codex.

Architecture

Codex connects to this MCP server over stdio.
The MCP server calls the Unity Editor bridge at http://127.0.0.1:17777.
The Unity Editor bridge executes Unity API work on the editor main thread.

Unity Setup

Open CrystalBattle_Client in Unity. The bridge starts automatically after scripts compile.

Manual controls are available from the bridge panel:

Tools/Codex Unity MCP/Bridge Panel

The panel shows the current connection status, endpoint, listener thread state, pending command count, total request count, recent command, and cached log count. It also includes buttons to start, stop, restart, copy the endpoint, and print status to the Unity Console.

Install Dependencies

From this directory:

pnpm install

If pnpm is not on PATH, use the Codex bundled runtime:

& "C:\Users\admin\.cache\codex-runtimes\codex-primary-runtime\dependencies\bin\pnpm.cmd" install

Tools

unity_health
unity_refresh_assets
unity_execute_menu_item
unity_get_console_logs
unity_generate_ui_prefab
unity_export_prefab_to_json

Environment

Optional:

UNITY_MCP_BRIDGE_URL=http://127.0.0.1:17777

Codex Config

The workspace includes .codex/config.toml with a crystalbattle-unity MCP server entry. Restart Codex after dependency installation so the new MCP server is discovered.

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