Performs basic arithmetic operations
AI agents call calculator to retrieve information from MCP Server Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
A calculator performing arithmetic operations only reads/computes values from its inputs and returns results. It has no side effects, does not store data, execute code, or interact with external systems. Misuse potential is minimal, hence low severity.
From the tool's definition 'Performs basic arithmetic operations' — purely computational, no data persistence or side effects
Attacks that exploit this kind of access
Performs basic arithmetic operations. It is categorised as a Read tool in the MCP Server Tools MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Tools MCP server in PolicyLayer and add a rule for 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 MCP Server Tools. Nothing to install.
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 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 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.
calculator is provided by the MCP Server Tools MCP server (viowb/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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