AI agents call probability_calculator 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.
A probability calculator in a math MCP server computes probabilities from input parameters—a read-only operation that retrieves or derives mathematical results. The presence of related tools like 'expression_evaluator' and 'calculus_engine' reinforces this as a computational utility. No evidence suggests destructive, financial, or code-execution capabilities.
From the tool's definition Tool name 'probability_calculator' and sibling context (math computation tools) indicate this performs calculations and queries on probability data without modifying external state. Description is empty, limiting precision.
Documented attack patterns abuse exactly the kind of access probability_calculator 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 probability_calculator:
{
"version": "1",
"default": "deny",
"tools": {
"probability_calculator": {}
}
}probability_calculator is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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probability_calculator. 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 probability_calculator: 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.
probability_calculator 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 probability_calculator 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 probability_calculator. 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.
probability_calculator 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.