Calculate the remainder of division (modulo operation).
AI agents call modulo to retrieve information from Calculator MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The modulo tool performs a pure arithmetic computation with no side effects, data modification, or external operations. It simply returns the remainder of a division, making it a read/query-type operation with minimal risk.
From the tool's definition Calculate the remainder of division (modulo operation)
Attacks that exploit this kind of access
Calculate the remainder of division (modulo operation). It is categorised as a Read tool in the Calculator MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Calculator MCP Server MCP server in PolicyLayer and add a rule for modulo: 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 Calculator MCP Server. Nothing to install.
modulo 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 modulo 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 modulo. 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.
modulo is provided by the Calculator MCP Server MCP server (sathiya-moorthi/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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