copy-file · Nextcloud MCP: Risk & Policy

WHAT IT DOES

What copy-file does on Nextcloud

AI agents use copy-file to create or update resources in Nextcloud — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nextcloud environment.

WHY IT NEEDS A POLICY

Why copy-file needs a policy

File copying creates new data structures in the storage system but does not irreversibly delete or destroy data, does not execute arbitrary code, and does not move money. While it modifies the filesystem state, the operation is reversible (copies can be deleted). Compared to sibling tools like delete-file (Destructive) and execute-style operations, this is clearly Write.

From the tool's definition Tool is named 'copy-file' and described as 'Copy a file or directory in NextCloud'. The copy operation creates new data (duplicates of existing files/directories) without deleting originals, which is a reversible modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

copy-file Rate-limited

copy-file 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-file": {
      "limits": [
        {
          "counter": "copy-file_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 Nextcloud, so you can run agents against it safely.

FAQ

Questions about copy-file

What does the copy-file tool do? +

Copy a file or directory in NextCloud. It is categorised as a Write tool in the Nextcloud 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-file? +

Register the Nextcloud MCP server in PolicyLayer and add a rule for copy-file: 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 Nextcloud. Nothing to install.

What risk level is copy-file? +

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

Can I rate-limit copy-file? +

Yes. Add a rate_limit block to the copy-file 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-file completely? +

Set action: deny in the PolicyLayer policy for copy-file. 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-file? +

copy-file is provided by the Nextcloud MCP server (nextcloud-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.