AI agents call list_roms to retrieve information from MCP GameBoy Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of available ROM files from the server's filesystem or storage. It performs no modification, deletion, execution, or financial operation. The blast radius of misuse is minimal—an attacker gains only information about available files, not access to their contents or the ability to alter them.
From the tool's definition Tool name 'list_roms' and description 'List all available GameBoy ROM files' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_roms gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP GameBoy Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_roms:
{
"version": "1",
"default": "deny",
"tools": {
"list_roms": {}
}
}list_roms is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available GameBoy ROM files. It is categorised as a Read tool in the MCP GameBoy Server MCP Server, which means it retrieves data without modifying state.
Register the MCP GameBoy Server MCP server in PolicyLayer and add a rule for list_roms: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP GameBoy Server. Nothing to install.
list_roms is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_roms rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_roms. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_roms is provided by the MCP GameBoy Server MCP server (mario-andreschak/mcp-gameboy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP GameBoy Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 MCP GameBoy Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.