subtract · MCP Server Bootstrap MCP: Risk & Policy

WHAT IT DOES

What subtract does on MCP Server Bootstrap

AI agents use subtract to create or update resources in MCP Server Bootstrap — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Server Bootstrap environment.

WHY IT NEEDS A POLICY

Why subtract needs a policy

An AI agent can call subtract faster than any human can review — one bad instruction and it creates or modifies resources in MCP Server Bootstrap by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

subtract Rate-limited

subtract stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about subtract

What does the subtract tool do? +

Return a - b. It is categorised as a Write tool in the MCP Server Bootstrap MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on subtract? +

Register the MCP Server Bootstrap 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 MCP Server Bootstrap. Nothing to install.

What risk level is subtract? +

subtract is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

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 MCP Server Bootstrap MCP server (zzenonn/mcp_bootstrap). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.