copy_worksheet · Excel MCP: Risk & Policy

WHAT IT DOES

What copy_worksheet does on Excel

AI agents use copy_worksheet 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_worksheet needs a policy

The tool duplicates worksheet structures and data within a workbook, which is a write operation that creates new content. It is reversible (the copied worksheet can be deleted) and does not irreversibly destroy data or execute arbitrary code. The blast radius is medium because duplicating a large worksheet could consume resources or create confusion, but the effect is non-destructive and can be undone.

From the tool's definition "Copy a worksheet within the same workbook" - creates a duplicate of worksheet data, a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

copy_worksheet Rate-limited

copy_worksheet 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_worksheet": {
      "limits": [
        {
          "counter": "copy_worksheet_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_worksheet

What does the copy_worksheet tool do? +

Copy a worksheet within the same workbook. 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_worksheet? +

Register the Excel MCP server in PolicyLayer and add a rule for copy_worksheet: 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_worksheet? +

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

Can I rate-limit copy_worksheet? +

Yes. Add a rate_limit block to the copy_worksheet 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_worksheet completely? +

Set action: deny in the PolicyLayer policy for copy_worksheet. 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_worksheet? +

copy_worksheet 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.