Evaluate a mathematical expression and return the result. Supported operations: - Arithmetic: +, -, *, /, %, - Parentheses for grouping: (2 + 3) * 4 - Common functions: abs, ceil, floor, round, sqrt, min, max - Constants: PI, E Safety: - Does NOT use eval() — uses a safe expression parser - Rejec...
AI agents call calculator to retrieve information from MCP Toolkit Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only computation on mathematical expressions without side effects, data modification, code execution, or external system interaction. It is purely deterministic and returns calculated results. The safety note confirms it avoids eval() and restricts input to mathematical expressions only, making misuse minimal and impact nil.
From the tool's definition The tool 'Evaluate a mathematical expression and return the result' with supported operations limited to 'Arithmetic: +, -, *, /, %, **' and 'Common functions: abs, ceil, floor, round, sqrt, min, max' and 'Constants: PI, E'.
Attacks that exploit this kind of access
Evaluate a mathematical expression and return the result. Supported operations: - Arithmetic: +, -, *, /, %, - Parentheses for grouping: (2 + 3) * 4 - Common functions: abs, ceil, floor, round, sqrt, min, max - Constants: PI, E Safety: - Does NOT use eval() — uses a safe expression parser - Rejects any non-mathematical input Examples: -. It is categorised as a Read tool in the MCP Toolkit Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Toolkit Server 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 Toolkit Server. 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 Toolkit Server MCP server (vyshnavi-nandyala/mcp-toolkit-server). 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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