numbers_list_tables

THE RISK

Low Risk

Why numbers_list_tables needs a policy

This tool retrieves metadata about tables (names and dimensions) from a Numbers spreadsheet. It performs no data modification, deletion, or execution of arbitrary operations. It is purely informational and read-only, making it the lowest risk category.

From the tool's definition Tool name 'numbers_list_tables' and description 'List all tables in a sheet with their dimensions' indicate a retrieval operation that queries existing data without modification or side effects.

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

POLICY

How to control numbers_list_tables

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

policy.json

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

numbers_list_tables 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 Iwork — 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 Iwork 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 numbers_list_tables

What does the numbers_list_tables tool do? +

List all tables in a sheet with their dimensions. It is categorised as a Read tool in the Iwork MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on numbers_list_tables? +

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

What risk level is numbers_list_tables? +

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

Can I rate-limit numbers_list_tables? +

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

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

numbers_list_tables is provided by the Iwork MCP server (reichenbach/iwork_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Iwork tool call.

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

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