list_sheets

THE RISK

Low Risk

Why list_sheets needs a policy

This tool retrieves information about worksheet names without creating, modifying, deleting, or executing any operations. It has no side effects and presents minimal risk of misuse by an AI agent.

From the tool's definition Tool name 'list_sheets' and description 'List all worksheet names in a workbook' indicate a read-only query operation that retrieves metadata about existing sheets without modification.

Documented attack patterns abuse exactly the kind of access list_sheets gives an agent:

POLICY

How to control list_sheets

PolicyLayer is an MCP gateway — it sits between your AI agents and Excel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sheets:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_sheets": {}
  }
}

list_sheets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Excel MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Excel MCP Server tools

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All 17 Excel MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_sheets

What does the list_sheets tool do? +

List all worksheet names in a workbook. It is categorised as a Read tool in the Excel MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_sheets? +

Register the Excel MCP Server MCP server in PolicyLayer and add a rule for list_sheets: 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 list_sheets? +

list_sheets is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_sheets? +

Yes. Add a rate_limit block to the list_sheets 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 list_sheets completely? +

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

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

Enforce policy on every Excel MCP Server tool call.

Start from Excel MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →