numbers_remove_background

THE RISK

High Risk

Why numbers_remove_background needs a policy

This tool triggers an AI-powered background removal operation and opens a UI mode in an external application. It executes an automated process with side effects (modifying image appearance), but the operation appears to be a non-destructive edit within the iWork/Creator Studio environment.

From the tool's definition Remove the background from an image using AI (Creator Studio only). Opens background removal mode.

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

POLICY

How to control numbers_remove_background

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_remove_background:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "numbers_remove_background": {
      "limits": [
        {
          "counter": "numbers_remove_background_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

numbers_remove_background stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in Iwork → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-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.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about numbers_remove_background

What does the numbers_remove_background tool do? +

Remove the background from an image using AI (Creator Studio only). Opens background removal mode. It is categorised as a Execute tool in the Iwork MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on numbers_remove_background? +

Register the Iwork MCP server in PolicyLayer and add a rule for numbers_remove_background: 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_remove_background? +

numbers_remove_background is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit numbers_remove_background? +

Yes. Add a rate_limit block to the numbers_remove_background 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_remove_background completely? +

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

numbers_remove_background 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 →