GameDev MCP Server

Engine-agnostic Model Context Protocol server shared by the game-engine MCP plugins:

• Unity-MCP — Unity Editor & games
• Godot-MCP — Godot Editor & games
• Unreal-MCP — Unreal Editor & games

It is a thin host over the NuGet packages com.IvanMurzak.McpPlugin.Server and com.IvanMurzak.ReflectorNet, where all the real server logic lives. The server bridges MCP clients (Claude, Cursor, Copilot, …) and an engine plugin over SignalR:

MCP client  ⇄  gamedev-mcp-server  ⇄ (SignalR) ⇄  engine plugin (Unity / Godot / Unreal)

There is no engine-specific code in this repository — one server binary serves all three engine plugins. Tools, resources and prompts are provided dynamically by whichever engine plugin connects.

Not to be confused with AI-Game-Dev-Server — the cloud LLM/billing proxy. This project is the local MCP stdio/http proxy host.

Install / Run

Pre-built executables

Download the zip for your platform from Releases (gamedev-mcp-server-<rid>.zip — win-x64, win-x86, win-arm64, linux-x64, linux-arm64, osx-x64, osx-arm64), unzip, and run:

./gamedev-mcp-server --port 8080 --client-transport stdio

Typical MCP client configuration (stdio):

{
  "mcpServers": {
    "GameDev-MCP": {
      "command": "path/to/gamedev-mcp-server",
      "args": ["--port=8080", "--client-transport=stdio"]
    }
  }
}

Docker

docker run -i --rm -p 8080:8080 aigamedeveloper/mcp-server

dotnet tool

dotnet tool install --global com.IvanMurzak.GameDev.MCP.Server
gamedev-mcp-server --port 8080

Build from source

dotnet build com.IvanMurzak.GameDev.MCP.Server.csproj
dotnet run --project com.IvanMurzak.GameDev.MCP.Server.csproj -- --client-transport stdio --port 8080

Cross-platform self-contained executables for all 7 RIDs: ./build-all.sh (bash) or ./build-all.ps1 (PowerShell). Outputs land in publish/<rid>/ and are zipped as gamedev-mcp-server-<rid>.zip (skip zipping with --no-zip / -NoZip).

Configuration

CLI arguments override environment variables.

| Environment variable | CLI argument | Default | Description | | --- | --- | --- | --- | | MCP_PLUGIN_PORT | --port | 8080 | Client → Server ← Plugin connection port | | MCP_PLUGIN_CLIENT_TIMEOUT | --plugin-timeout | 10000 | Plugin → Server connection timeout (ms) | | MCP_PLUGIN_CLIENT_TRANSPORT | --client-transport | stdio | Client → Server transport: stdio or streamableHttp | | MCP_PLUGIN_IDLE_TIMEOUT_SECONDS | --idle-timeout-seconds | 21600 | streamableHttp idle-session eviction window (this host seeds 6h instead of the package default of 600s) |

Logs are written to logs/server-log.txt (and logs/server-log-error.txt); in stdio mode console logging is redirected to stderr so stdout stays clean for the MCP JSON stream.

Compatibility

| GameDev-MCP-Server | McpPlugin.Server | ReflectorNet | Unity-MCP plugin | Godot-MCP addon | Unreal-MCP plugin | | --- | --- | --- | --- | --- | --- | | 8.0.0 | 6.7.1 | 5.3.1 | ≥ 0.80.x | ≥ 0.3.x | ≥ 0.1.x |

The engine plugin versions listed are the ones pinning McpPlugin 6.7.x — any plugin built against McpPlugin 6.7.x talks to this server. The server version (8.0.0) is deliberately above every per-engine server artifact it replaces so auto-updaters treat it as newer.

License

Apache-2.0 — Copyright (c) 2026 Ivan Murzak