Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
Gearsystem MCP Server
Overview
Description from the maker (original English)
MCP server for Gearsystem Sega Master System / Game Gear / SG-1000 emulator
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs on your computer
- Transport: stdio
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- The registry lists no key to fill in.
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Download the maker’s .mcpb file
The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.
Run this in your terminal
Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account drhelius, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Otheri
- More stars than 0% of the other 32484 servers in this category
- Published to the registry more recently than 83% of the other 32484 servers in this category
- Basic checks equal to or better than 100% of the other 32484 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Gearsystem MCP Server safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (3.9.24) reached the registry 7 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need MCPB on your computer.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Recta
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated yesterday
Install
Recta
by RectaBuild
Cheaper cross-chain stablecoin routes for AI agents; 5 % of the verified saving, nothing if none.
Computer or cloudUpdated today
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Gearsystem
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 AI debugging and development.
This is an open source project with its ongoing development made possible thanks to the support by these awesome backers. If you find it useful, please consider sponsoring.
Don't hesitate to report bugs or ask for new features by opening an issue.
Downloads
Platform Architecture Download Link
Windows Desktop x64 Gearsystem-3.9.24-desktop-windows-x64.zip
Desktop ARM64 Gearsystem-3.9.24-desktop-windows-arm64.zip
macOS Homebrew brew install --cask drhelius/geardome/gearsystem
Desktop Apple Silicon Gearsystem-3.9.24-desktop-macos-arm64.zip
Desktop Intel Gearsystem-3.9.24-desktop-macos-intel.zip
Linux Ubuntu PPA drhelius/ppa-geardome
Fedora RPM drhelius/rpm-geardome
Desktop Ubuntu 26.04 x64 Gearsystem-3.9.24-desktop-ubuntu26.04-x64.zip
Desktop Ubuntu 26.04 ARM64 Gearsystem-3.9.24-desktop-ubuntu26.04-arm64.zip
Desktop Ubuntu 24.04 x64 Gearsystem-3.9.24-desktop-ubuntu24.04-x64.zip
Desktop Ubuntu 24.04 ARM64 Gearsystem-3.9.24-desktop-ubuntu24.04-arm64.zip
MCPB All platforms MCP Readme
RetroArch All platforms Libretro core documentation
Dev Builds All platforms GitHub Actions
Notes:
- Windows: May need Visual C++ Redistributable and OpenGL Compatibility Pack
- Homebrew: If Homebrew asks you to trust the third-party tap, run
brew trust --tap drhelius/geardome - Linux: May need
libsdl3
Supported Machines
- Sega Mark III
- Sega Master System
- Sega Game Gear
- Sega Game 1000 (SG-1000)
- Othello Multivision
Features
- Very accurate Z80, VDP, PSG and FM emulation.
- Supported cartridges: ROM, ROM + RAM, SEGA, Codemasters, Korean, MSX + Nemesis, Janggun, SG-1000, and many Korean multi-carts.
- Automatic region detection: NTSC-JAP, NTSC-USA, PAL-EUR.
- Support for YM2413 (OPLL) FM sound chip.
- Gear-to-Gear cable support for two local desktop processes, including serial and parallel communication.
- Mark III Joy-Joy cable support for two local desktop processes.
- Light Phaser and Paddle Control support.
- Internal database for ROM detection.
- Battery powered RAM save support.
- Save states with preview and rewind support.
- Run-ahead support to reduce input latency.
- Compressed ROM support (ZIP).
- *Game Genie* and *Pro Action Replay* cheat support, with RetroArch
.chtimport. - VGM recorder.
- Supported platforms (standalone): Windows, Linux, BSD and macOS.
- Supported platforms (libretro): Windows, Linux, macOS, Raspberry Pi, Android, iOS, tvOS, webOS, PlayStation Vita, PlayStation 3, Nintendo 3DS, Nintendo GameCube, Nintendo Wii, Nintendo WiiU, Nintendo Switch, Emscripten, Classic Mini systems (NES, SNES, C64, ...), OpenDingux, RetroFW and QNX.
- Full debugger with just-in-time disassembler, CPU breakpoints, memory access breakpoints, code navigation (goto address, JP JR and CALL double clicking), debug symbols, automatic labels, memory editor, trace logger, IO inspector and VRAM viewer including tiles, sprites, backgrounds and palettes.
- MCP server for AI-assisted debugging with Claude Code, Codex and similar, exposing tools for execution control, memory inspection, hardware status, rewind and more.
- Windows, Linux and macOS *Portable Mode*.
- Programmable Shader Chain.
- ROM loading from the command line by adding the ROM path as an argument.
- ROM loading using drag & drop.
- Support for modern game controllers through gamecontrollerdb.txt file located in the same directory as the application binary.
Tips
Basic Usage
- 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
Nonein the Emulator menu. This emulates a machine without any media plugged in. - Overscan: For a precise representation of the original image, select Overscan
Top+Bottomand Aspect RatioStandard (4:3 DAR)in the Video menu. Game Gear will ignore any overscan settings. - Mouse Cursor: Automatically hides when hovering over the main output window or when Main Menu is disabled.
- Portable Mode: Run with
--portable, or create an empty file namedportable.iniin the same directory as the application binary. On macOS, place the file next to the.appbundle. - Gear-to-Gear and Mark III Link Cable:
Open Link Cable in two desktop instances, select the same session, and connect both, or start each process with --link-session N. Select Auto, Gear-to-Gear, or Mark III under Protocol; the session is independent of this selection. Auto uses Gear-to-Gear for native Game Gear software and Mark III Joy-Joy for F-16 Fighting Falcon (Japan). For Mark III, Return, 1, 2, and Space are mapped to the SK-1100 keyboard. Reset the console if Mark III hardware is attached after startup. Independent instances should use separate application copies or --portable data directories so configuration, saves, and single-instance handling do not conflict.
Debugging Features
- Docking Windows: In debug mode, you can dock windows together by pressing SHIFT and dragging a window onto another.
- Multi-viewport: In Windows or macOS, you can enable "multi-viewport" in the debug menu. You must restart the emulator for the change to take effect. Once enabled, you can drag debugger windows outside the main window.
- Single Instance: You can enable "Single Instance" in the
Emulatormenu. When enabled, opening a ROM while another instance is running will send the ROM to the running instance instead of starting a new one. - Debug Symbols: The emulator automatically tries to load a symbol file when loading a ROM (.sym, .noi). For example, for
path_to_rom_file.smsit tries to loadpath_to_rom_file.sym. You can also load a symbol file using the GUI or the CLI. It supports sjasmplus/Pasmo (EQU), SDCC/NoICE (.noi), wla-dx and vasm/generic file formats.
Command Line Usage
gearsystem [options] [rom_file] [symbol_file]Arguments: [rom_file] ROM file: accepts ROMs (.sms, .gg, .sg, .mv) or ZIP (.zip) [symbol_file] Optional symbol file for debugging
Options: -f, --fullscreen Start in fullscreen mode -w, --windowed Start in windowed mode with menu visible --load-state SLOT Load save state slot 1-5, or a state file, once the media is loaded --mcp-stdio Auto-start MCP server with stdio transport --mcp-http Auto-start MCP server with HTTP transport --mcp-router Enable compact MCP tool routing --mcp-http-address A HTTP bind address (default: 127.0.0.1) --mcp-http-port N HTTP port for MCP server (default: 7777) --headless Run without GUI (requires MCP or Link Cable) --link-session N Connect to link cable session 1-255 --link-stall-us N Override barrier stall threshold (0=default) --portable Store configuration and user data beside the application -v, --version Display version information -h, --help Display this help message
MCP Server
Gearsystem includes a Model Context Protocol (MCP) server that enables AI-assisted debugging through AI agents like Claude Code, Codex and similar. The server provides tools for execution control, memory inspection, breakpoints, disassembly, hardware status, and more. STDIO and HTTP transports are supported, with STDIO preferred.
For complete setup instructions and tool documentation, see MCP_README.md.
Agent Skills
Gearsystem provides Agent Skills that teach AI assistants how to effectively use the emulator for specific tasks:
- [gearsystem-debugging](skills/gearsystem-debugging/SKILL.md) — Game debugging, code tracing, breakpoint management, hardware inspection, and reverse engineering.
- [gearsystem-romhacking](skills/gearsystem-romhacking/SKILL.md) — Cheat creation, memory searching, ROM data modification, text translation, and game patching.
Install with npx skills add drhelius/gearsystem. S
Only the beginning is shown; read the rest in the repo