Gearboy
Game Boy / Game Boy Color / Super Game Boy emulator and debugger with embedded MCP server for macOS, Windows, Linux, BSD and RetroArch.
No outside reports on file
The main risk is that specially crafted Game Boy ROM files could exploit the emulator, and the MCP server connection needs proper security controls to prevent unauthorized access.
Based on public adoption and transparency signals as of Oct 20, 2026. Our opinion, not a code audit or security guarantee.
What it can access
- Local filesNo local folder access notedLOW
- Command executionNo shell command runner notedLOW
- Network reachConnects to outside service APINOTED
- CredentialsNo API token requiredLOW
- Package sourceGitHub (drhelius/Gearboy)PUBLIC
Inferred from this listing’s public package details and description. Check the project’s source before installing.
Install
No npm or PyPI package is listed. Install from source: github.com/drhelius/Gearboy ↗
About Gearboy
Gearboy is a Game Boy emulator (a program that runs old Game Boy games on modern computers) that also includes a debugger tool. It adds an MCP server feature, which lets AI assistants like Claude interact with the emulator through a special protocol.
Who it’s for
Retro game enthusiasts and developers who want to play classic Game Boy games or debug Game Boy software. Developers building AI tools might use the MCP server to let assistants help with game analysis or development.
Alternatives
- Emulicious: Another Game Boy emulator with debugging features. - BGB (Bgb): A Game Boy emulator focused on accuracy and debugging. - Sameboy: An open-source, accurate Game Boy emulator.
Setup
Check these steps against the project’s own instructions before running anything.
This is a specialized emulator with MCP features. Follow the project's README on GitHub for installation steps for your operating system (macOS, Windows, Linux, or BSD). The README will explain how to enable and configure the MCP server component.
Why this grade
Signal-based grade (3/7 points): well starred on GitHub, public source code. This reflects adoption and transparency, not a code review.
Popularity and upkeep
- GitHub stars
- 1.2k
- Listing last refreshed
- 2026-10-29
These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.
Security reports
No reports found for this package in our research (last checked 2026-10-30).
Risks to watch for
- File system access: The emulator can read and write game ROM files and save data on your computer, potentially accessing any files if misconfigured. - Emulation exploits: Malicious Game Boy ROM files could trigger bugs in the emulator that let attackers run their own code. - MCP protocol exposure: If the MCP server is not properly secured, other programs or network connections could send unexpected commands to control the emulator. - Debugger disclosure: The debugger may expose internal memory, CPU state, or other technical details about running code. - Supply chain risk: Updates to the project could introduce unwanted changes, though the project is open-source and public.
How to lower the risk
Least-privilege permissions
- Run the emulator with the minimum file access needed (separate folder for ROMs only).
- Disable MCP server features if you don't actively use them.
Network isolation
- Keep the MCP server local to your machine; never expose it to the internet.
- Use a firewall to block unexpected connections to the emulator process.
Monitoring
- Watch for unusual CPU or disk activity when running ROM files.
- Check logs (if available) for errors or unexpected MCP server activity.
Red flags to watch for
- ROM files from untrusted sources or suspicious file sizes.
- Error messages mentioning memory access or segmentation faults.
Questions
How do I install Gearboy?
Gearboy does not publish a standalone npm or PyPI package. Clone or follow the setup instructions in its source repository at github.com/drhelius/Gearboy.
Are there security reports about Gearboy?
No reports found for this package in our research (last checked 2026-10-30). Gearboy currently holds Grade C (Moderate risk signals) based on public adoption and transparency signals. Key risk areas to watch include file system access.
Is Gearboy actively maintained?
Gearboy has 1.2k GitHub stars. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/drhelius/Gearboy before pinning it in production.
What are alternatives to Gearboy?
Notable alternatives to Gearboy include Emulicious (Another Game Boy emulator with debugging features. - **BGB (Bgb)**: A Game Boy emulator focused on accuracy and debugging. - **Sameboy**: An open-source, accurate Game Boy emulator). You can also compare Gearboy side by side with other MCP servers in the Related tools section on this page.
README badge and team notes
Maintain or use Gearboy? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.
GitHub README Markdown:
[](https://agentarmorhq.com/skills/drhelius-gearboy)HTML embed:
<a href="https://agentarmorhq.com/skills/drhelius-gearboy"><img src="https://agentarmorhq.com/api/badge/drhelius-gearboy" alt="AgentArmorHQ Risk Grade for Gearboy" height="20" /></a>Terminal check:
curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "drhelius-gearboy"Share with your security lead
Need sign-off to use Gearboy? Copy this note for Slack, a ticket or a pull request.
### AgentArmorHQ Security Review Memo: Gearboy
- **Listing URL:** https://agentarmorhq.com/skills/drhelius-gearboy
- **Type:** App connector
- **Risk Grade:** Grade C (Moderate risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 1.2k GitHub stars
#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** No shell command runner noted
- **Network reach:** Connects to outside service API
- **Credentials:** No API token required
- **Package source:** GitHub (drhelius/Gearboy)
#### Recommended Hardened Setup
- **Source Repo:** https://github.com/drhelius/Gearboy
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.
_Based on public adoption and transparency signals as of Oct 20, 2026. Our opinion, not a code audit or security guarantee._Key facts
- Type
- App connector
- Publisher
- drhelius
- Source code
- github.com/drhelius/Gearboy
- Est. context load
- ~1.1k tokens / turn (~6 tool schemas, 0.53% of 200k context)
- Popularity
- 1.2k GitHub stars
- Last updated
- 2026-10-29
- Last graded
- 2026-10-20
Community
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