AI agents call unit_converter to retrieve information from Math MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Unit conversion tools retrieve and compute transformations of input values without side effects, data modification, or irreversible actions. This is a Read category tool. Severity is low because misuse (e.g., incorrect unit conversions) has minimal blast radius and no destructive, financial, or system-level impact.
From the tool's definition Tool name 'unit_converter' indicates a utility for converting between measurement units (e.g., meters to feet, celsius to fahrenheit).
Documented attack patterns abuse exactly the kind of access unit_converter gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Math MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unit_converter:
{
"version": "1",
"default": "deny",
"tools": {
"unit_converter": {}
}
}unit_converter is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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unit_converter. It is categorised as a Read tool in the Math MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Math MCP Server MCP server in PolicyLayer and add a rule for unit_converter: 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 Math MCP Server. Nothing to install.
unit_converter is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the unit_converter 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.
Set action: deny in the PolicyLayer policy for unit_converter. 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.
unit_converter is provided by the Math MCP Server MCP server (111-test-111/math-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Math MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 Math MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.