AI agents use folder_create to create or update resources in MCP Server for Unity — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Server for Unity environment.
Creating a folder modifies the project structure reversibly. It is not destructive (the folder can be deleted), not financial, and not a read operation. It fits the Write category: creates or modifies data reversibly. Severity is medium because an agent could create many folders and clutter the project, but the action is easily undone.
From the tool's definition Tool name is 'folder_create' and description states 'Create a new folder in Unity project' — this creates new data/structure in the project.
Documented attack patterns abuse exactly the kind of access folder_create 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_create:
{
"version": "1",
"default": "deny",
"tools": {
"folder_create": {
"limits": [
{
"counter": "folder_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}folder_create stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a new folder in Unity project. It is categorised as a Write tool in the MCP Server for Unity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP Server for Unity MCP server in PolicyLayer and add a rule for folder_create: 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_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the folder_create 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_create. 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_create 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.