MCP server for Gearsystem Sega Master System / Game Gear / SG-1000 emulator
Connect Gearsystem to Claude, Cursor or any other MCP client and it stops being a tab you switch to. MCP server for Gearsystem Sega Master System / Game Gear / SG-1000 emulator. The gearsystem mcp server is what makes that connection.
Gearsystem is a very accurate, cross-platform Sega Master System / Game Gear / SG-1000 emulator written in C++ that runs on Windows, macOS, Linux, BSD and RetroArch, with an embedded MCP server for debugging and tooling.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
BIOS — Gearsystem can run with or without a BIOS. You can optionally load a BIOS and enable it. It's possible to run the title included in the BIOS byOverscan — For a precise representation of the original image, select Overscan Top+Bottom and Aspect Ratio Standard (4:3 DAR) in the Video menuWindows — The Windows tool exposed by this servermacOS — The macOS tool exposed by this serverLinux — If you are using Ubuntu 25.04 or later, you can install SDL3 directly. Use the following commands to build:Libretro — The Libretro tool exposed by this serverInstallation goes through your MCP client rather than a global install: point it at skills on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
This sits in the database access group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Gearsystem's toolset — BIOS, Overscan, Windows and 3 more — is a fair guide to whether it matches your workflow. It is maintained by drhelius; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Gearsystem's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| BIOS | Gearsystem can run with or without a BIOS. You can optionally load a BIOS and enable it. It's possible to run the title included in the BIOS by setting **Media Slot** to None in the **Emulator** menu. This emulates a mac |
| Overscan | For a precise representation of the original image, select **Overscan** Top+Bottom and **Aspect Ratio** Standard (4:3 DAR) in the **Video** menu. Game Gear will ignore any overscan settings. |
| Windows | The Windows tool exposed by this server. |
| macOS | The macOS tool exposed by this server. |
| Linux | If you are using Ubuntu 25.04 or later, you can install SDL3 directly. Use the following commands to build: |
| Libretro | The Libretro tool exposed by this server. |
{
"mcpServers": {
"gearsystem": {
"command": "npx",
"args": ["-y", "skills"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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