AI agents call number_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.
The tool name suggests data retrieval/transformation of numerical values without modification of persistent state. Although the description is empty and reduces confidence, the name implies a read-only computation. Converted numbers would be returned to the user without creating, modifying, deleting, or executing external operations. Severity is low because number conversion has minimal blast radius even if misused.
From the tool's definition Tool name 'number_converter' suggests a utility that converts between number formats or bases (e.g., decimal to binary, hexadecimal conversion). No description provided to confirm function.
Documented attack patterns abuse exactly the kind of access number_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 number_converter:
{
"version": "1",
"default": "deny",
"tools": {
"number_converter": {}
}
}number_converter is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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number_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 number_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.
number_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 number_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 number_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.
number_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.