subtract · Terminal MCP Server MCP: Risk & Policy

WHAT IT DOES

What subtract does on Terminal MCP Server

AI agents call subtract as a supporting operation in Terminal MCP Server workflows.

WHY IT NEEDS A POLICY

Why subtract needs a policy

With no description available, we can only guess based on the name. 'Subtract' most likely performs a basic arithmetic subtraction with no side effects, similar to sibling tools 'add' and 'multiply'. However, given the server also has a 'terminal' tool that executes shell commands, there is minor uncertainty. Confidence is very low due to the empty description.

From the tool's definition Tool description is empty; tool name 'subtract' suggests a simple arithmetic operation, but there is no description to confirm behavior.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

subtract Rate-limited

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

View as policy code

policy.json

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

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Terminal MCP Server, so you can run agents against it safely.

FAQ

Questions about subtract

What does the subtract tool do? +

subtract. It is categorised as a Other tool in the Terminal MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on subtract? +

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

What risk level is subtract? +

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

Can I rate-limit subtract? +

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

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

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