copy_worksheet · Excel MCP Server MCP: Risk & Policy

WHAT IT DOES

What copy_worksheet does on Excel MCP Server

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

WHY IT NEEDS A POLICY

Why copy_worksheet needs a policy

Copying a worksheet creates new data structures within the workbook (a duplicated sheet with its contents) but is reversible—the copied worksheet can be deleted. This qualifies as Write rather than Destructive. Severity is medium because while the operation is reversible, unauthorized copying could lead to data duplication, confusion, or consumption of resources.

From the tool's definition Tool name is 'copy_worksheet' and description states 'Copy worksheet within workbook.' This is a data creation/duplication operation that modifies the workbook structure by adding a new worksheet copy.

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"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about copy_worksheet

What does the copy_worksheet tool do? +

Copy worksheet within workbook. It is categorised as a Write tool in the Excel 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_worksheet? +

Register the Excel MCP Server 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 MCP Server. 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 MCP server (thibaudvandendooren-acumen/excel-mcp-server-v2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.