mikey_math_eval · Mcp Math MCP: Risk & Policy

WHAT IT DOES

What mikey_math_eval does on Mcp Math

AI agents invoke mikey_math_eval to trigger actions in Mcp Math. 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 mikey_math_eval needs a policy

The tool actively evaluates (executes) a mathematical expression rather than merely retrieving stored data. While the blast radius is limited to the math computation environment (no file system or network access implied), arbitrary expression evaluation can in principle be misused to run expensive computations or trigger unintended SymPy behavior.

From the tool's definition "Evaluate mathematical expression" — executes/runs a mathematical expression using SymPy and exact arithmetic engine

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mikey_math_eval Rate-limited

mikey_math_eval 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": {
    "mikey_math_eval": {
      "limits": [
        {
          "counter": "mikey_math_eval_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 Mcp Math, so you can run agents against it safely.

FAQ

Questions about mikey_math_eval

What does the mikey_math_eval tool do? +

Evaluate mathematical expression with exact arithmetic. Returns exact fractions/integers, not floats. It is categorised as a Execute tool in the Mcp Math MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on mikey_math_eval? +

Register the Mcp Math MCP server in PolicyLayer and add a rule for mikey_math_eval: 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 Math. Nothing to install.

What risk level is mikey_math_eval? +

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

Can I rate-limit mikey_math_eval? +

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

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

mikey_math_eval is provided by the Mcp Math MCP server (mikeybeez/mcp-math). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.