numbers_clear_cells

THE RISK

Critical Risk

Why numbers_clear_cells needs a policy

Clearing cell contents removes data irreversibly (no undo via MCP), affecting potentially large ranges of spreadsheet data. This is a destructive operation as the original data cannot be recovered through the MCP interface once cleared.

From the tool's definition Clear the contents of a cell or range

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

POLICY

How to control numbers_clear_cells

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_clear_cells:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "numbers_clear_cells"
  ]
}

numbers_clear_cells disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 114 Iwork tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Iwork → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about numbers_clear_cells

What does the numbers_clear_cells tool do? +

Clear the contents of a cell or range. It is categorised as a Destructive tool in the Iwork MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on numbers_clear_cells? +

Register the Iwork MCP server in PolicyLayer and add a rule for numbers_clear_cells: 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_clear_cells? +

numbers_clear_cells is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit numbers_clear_cells? +

Yes. Add a rate_limit block to the numbers_clear_cells 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_clear_cells completely? +

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

numbers_clear_cells 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.

CHECK YOUR STACK →