add

THE RISK

Low Risk

Why add needs a policy

This tool simply performs arithmetic addition of two numbers. It has no side effects, does not read or write any data, does not execute code or commands, and has no financial implications. It is a pure computation utility.

From the tool's definition Tool name: 'add', description: 'Add two numbers'

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

POLICY

How to control add

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add": {
      "limits": [
        {
          "counter": "add_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

add gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register 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.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add

What does the add tool do? +

Add two numbers. It is categorised as a Other tool in the MCP-Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on add? +

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

What risk level is add? +

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

Can I rate-limit add? +

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

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

add is provided by the MCP-Server MCP server (officehub-tech-llc/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-Server tool call.

Start from 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 →