copy_file · MCP Workspace Server MCP: Risk & Policy

WHAT IT DOES

What copy_file does on MCP Workspace Server

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

WHY IT NEEDS A POLICY

Why copy_file needs a policy

This tool creates new copies of files/directories (write operation), which is reversible through deletion. It doesn't execute code, delete data irreversibly, or move money. Severity is medium rather than high because the operation is confined to a workspace sandbox and is fully reversible; however, it could be misused to duplicate sensitive data or overwrite existing files if destination path control is inadequate.

From the tool's definition copy_file with description 'Copy files or directories from one location to another' creates new file copies, which is a reversible write operation. The server operates within 'a designated workspace directory', constraining blast radius.

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 MCP Workspace Server, so you can run agents against it safely.

FAQ

Questions about copy_file

What does the copy_file tool do? +

Copy files or directories from one location to another. It is categorised as a Write tool in the MCP Workspace 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_file? +

Register the MCP Workspace Server 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 MCP Workspace Server. 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 MCP Workspace Server MCP server (shayyeffet/ultimate_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.