copy_folder · Node Dev MCP Server MCP: Risk & Policy

WHAT IT DOES

What copy_folder does on Node Dev MCP Server

AI agents use copy_folder to create or update resources in Node Dev MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Node Dev MCP Server environment.

WHY IT NEEDS A POLICY

Why copy_folder needs a policy

Copying a folder is a reversible write operation that creates new data without destructive consequences. It does not delete, execute code, or move money. While it could potentially fill disk space if misused at scale, the primary action is data creation/duplication, placing it in the Write category.

From the tool's definition Tool name 'copy_folder' and description 'Copy a folder in the workspace folder' indicate it creates a duplicate of a folder, which modifies the workspace by adding new data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

copy_folder Rate-limited

copy_folder 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "copy_folder": {
      "limits": [
        {
          "counter": "copy_folder_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Node Dev MCP Server, so you can run agents against it safely.

FAQ

Questions about copy_folder

What does the copy_folder tool do? +

Copy a folder in the workspace folder. It is categorised as a Write tool in the Node Dev MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on copy_folder? +

Register the Node Dev MCP Server MCP server in PolicyLayer and add a rule for copy_folder: 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 Node Dev MCP Server. Nothing to install.

What risk level is copy_folder? +

copy_folder is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit copy_folder? +

Yes. Add a rate_limit block to the copy_folder 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.

How do I block copy_folder completely? +

Set action: deny in the PolicyLayer policy for copy_folder. 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.

What MCP server provides copy_folder? +

copy_folder is provided by the Node Dev MCP Server MCP server (liamcarver/node-dev-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.