calc · TypeScript MCP Server Boilerplate MCP: Risk & Policy

WHAT IT DOES

What calc does on TypeScript MCP Server Boilerplate

AI agents invoke calc to trigger actions in TypeScript MCP Server Boilerplate. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why calc needs a policy

The tool executes arithmetic computations. While technically stateless and read-like, arithmetic evaluation is an execution operation rather than a pure data retrieval. Blast radius is very low since it only operates on two numbers with basic operations and has no side effects on external systems or data.

From the tool's definition "Performs basic arithmetic operations on two numbers"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calc Rate-limited

calc 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about calc

What does the calc tool do? +

Performs basic arithmetic operations on two numbers. It is categorised as a Execute tool in the TypeScript MCP Server Boilerplate MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on calc? +

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

What risk level is calc? +

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

Can I rate-limit calc? +

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

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

calc is provided by the TypeScript MCP Server Boilerplate MCP server (ssuyjk-del/my-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.