AI agents call folder_list to retrieve information from MCP Server for Unity without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays directory contents without modifying, creating, or deleting any files or folders. It is a simple enumeration/query operation analogous to 'ls' or 'dir' commands, which are read operations. The low severity reflects minimal blast radius—misuse would only expose file structure information.
From the tool's definition Tool name 'folder_list' and description 'List contents of a folder in Unity project' indicate a read-only query operation with no side effects.
Documented attack patterns abuse exactly the kind of access folder_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Server for Unity, and nothing reaches the server without passing your rules. This is the rule we recommend for folder_list:
{
"version": "1",
"default": "deny",
"tools": {
"folder_list": {}
}
}folder_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List contents of a folder in Unity project. It is categorised as a Read tool in the MCP Server for Unity MCP Server, which means it retrieves data without modifying state.
Register the MCP Server for Unity MCP server in PolicyLayer and add a rule for folder_list: 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 Server for Unity. Nothing to install.
folder_list 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 folder_list 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 folder_list. 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.
folder_list is provided by the MCP Server for Unity MCP server (zabaglione/mcp-server-unity). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Server for Unity, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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15 MCP Server for Unity tools catalogued and risk-classified — across an index of 43,000+ MCP servers.