Geargrafx MCP Server

What Geargrafx MCP Server does

Geargrafx MCP Server MCP server connects an AI client to the Geargrafx emulator, a C++ application for PC Engine, TurboGrafx-16, SuperGrafx, CD-ROM², Super CD-ROM², Arcade CD-ROM², and NEC LaserActive LD-ROM² software. Its MCP interface is intended for AI-assisted debugging and development rather than general game-library management.

The emulator includes a debugger with a just-in-time disassembler, CPU and memory breakpoints, code navigation, debug symbols, automatic labels, a memory editor, PSG inspection, and video inspection. The MCP feature exposes selected emulator control and inspection functions to clients such as Claude, Codex, GitHub Copilot, and similar AI tools.

How it works

Geargrafx MCP Server MCP server runs as part of Geargrafx rather than as a separate service described in the available documentation. An AI client communicates with the embedded MCP server while the emulator provides the active debugging context. This arrangement lets an agent work with the running emulation state, including processor execution, memory, hardware information, and rewind behavior.

The underlying emulator supports ROM and disc images for the supported systems, save states with previews, rewind, run-ahead, backup RAM, Memory Base 128, TurboLink, multitap input, and several controller types.

Setup and configuration

Install a Geargrafx build for the target platform, then use its embedded MCP support according to the linked MCP documentation. The project lists Windows x64 and ARM64 packages, macOS Homebrew and desktop packages, Linux packages and archives, and an MCPB download for all platforms. Standalone builds are listed for Windows, Linux, BSD, and macOS.

It also does not document a required command-line flag for enabling the MCP interface. Consult the repository's MCP_README.md for client-specific setup details before configuring an AI application.

Geargrafx may require additional emulator dependencies. Windows builds may need the Visual C++ Redistributable and OpenGL Compatibility Pack; Linux builds may need libsdl3. CD-ROM games require a BIOS, and LaserActive images require the relevant PAC BIOS. These requirements concern emulator operation and may apply before debugging through MCP.

Tools and capabilities

The Geargrafx MCP Server MCP server is documented as providing tools for:

• Controlling emulator execution.
• Inspecting emulated memory.
• Reading hardware status.
• Rewinding emulation.
• Supporting additional AI-assisted debugging operations.

The full Geargrafx debugger also exposes CPU breakpoints, memory access breakpoints, disassembly, code navigation, symbols, labels, memory editing, PSG details, video registers, tiles, sprites, backgrounds, CD-ROM subsystems, and SuperGrafx VDC views.

Limitations and notes

Geargrafx MCP Server MCP server is tied to the Geargrafx emulator and is therefore suited to debugging supported PC Engine-family software, not to arbitrary emulators.

The emulator's media and BIOS requirements remain relevant. CD-ROM operation needs a BIOS, compressed and uncompressed image formats have documented restrictions, and MP3 audio tracks are not supported in CUE images. Desktop rewind and run-ahead are disabled for LaserActive. These are emulator limitations rather than stated MCP-specific restrictions.

The project describes support for GitHub Copilot, Claude, Codex, and similar AI clients, but it does not confirm compatibility with every MCP application. Verify the repository's current MCP documentation and the selected Geargrafx release before relying on a particular client or tool behavior.