copy_range · Excel MCP: Risk & Policy

WHAT IT DOES

What copy_range does on Excel

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

WHY IT NEEDS A POLICY

Why copy_range needs a policy

This tool creates or modifies data in a reversible manner by copying cell ranges within an Excel workbook. While it modifies the destination location, the operation is not destructive (original data persists) and can be undone. It falls under Write rather than Read (it modifies state) or Destructive (it does not irreversibly delete).

From the tool's definition Tool name 'copy_range' and description 'Copy a range of cells to another location' indicate data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

copy_range Rate-limited

copy_range 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_range": {
      "limits": [
        {
          "counter": "copy_range_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 Excel, so you can run agents against it safely.

FAQ

Questions about copy_range

What does the copy_range tool do? +

Copy a range of cells to another location. It is categorised as a Write tool in the Excel 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_range? +

Register the Excel MCP server in PolicyLayer and add a rule for copy_range: 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 Excel. Nothing to install.

What risk level is copy_range? +

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

Can I rate-limit copy_range? +

Yes. Add a rate_limit block to the copy_range 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_range completely? +

Set action: deny in the PolicyLayer policy for copy_range. 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_range? +

copy_range is provided by the Excel MCP server (shmaxi/excel-mcp-server-node). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.