convert_units

THE RISK

Low Risk

Why convert_units needs a policy

Unit conversion is a pure computational/read operation — it takes an input value and unit, and returns the equivalent in another unit. No data is created, modified, deleted, or sent anywhere. The server description mentions '158 unit conversions' as a feature. No side effects are expected. Confidence is slightly reduced because the description is minimal.

From the tool's definition Tool name: 'convert_units', description: 'Unit conversion'

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

POLICY

How to control convert_units

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "convert_units": {}
  }
}

convert_units is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MCP Mathematics — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Mathematics tools

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All 18 MCP Mathematics tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about convert_units

What does the convert_units tool do? +

Unit conversion. It is categorised as a Read tool in the MCP Mathematics MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on convert_units? +

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

What risk level is convert_units? +

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

Can I rate-limit convert_units? +

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

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

convert_units is provided by the MCP Mathematics MCP server (shsharkar/mcp-mathematics). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Mathematics tool call.

Start from MCP Mathematics, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →