AI agents invoke basic_arithmetic to trigger actions in Math MCP Server. 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.
The tool name suggests basic mathematical operations (addition, subtraction, multiplication, division). Given the server context as a math computation server, this likely evaluates arithmetic expressions. With an empty description, confidence is low, but it most plausibly executes computations rather than reading stored data or writing/modifying anything.
From the tool's definition Tool name is 'basic_arithmetic'; description is empty or uninformative.
Documented attack patterns abuse exactly the kind of access basic_arithmetic 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 basic_arithmetic:
{
"version": "1",
"default": "deny",
"tools": {
"basic_arithmetic": {
"limits": [
{
"counter": "basic_arithmetic_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}basic_arithmetic 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.
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basic_arithmetic. It is categorised as a Execute tool in the Math MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Math MCP Server MCP server in PolicyLayer and add a rule for basic_arithmetic: 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.
basic_arithmetic is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the basic_arithmetic 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 basic_arithmetic. 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.
basic_arithmetic 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.