Safely evaluate mathematical expressions with support for basic operations and math functions. Supported operations: +, -, *, /, , () Supported functions: sin, cos, tan, log, sqrt, abs, pow Note: Use this tool to evaluate a single mathematical expression. To compute descriptive statistics over a ...
Risk signalsAccepts freeform code/query input (expression)
Part of the Math MCP Learning server.
Free to start. No card required.
AI agents call calc_expression to retrieve information from Math MCP Learning without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though calc_expression only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"calc_expression": {}
}
}See the full Math MCP Learning policy for all 17 tools.
These attack patterns abuse exactly the kind of access calc_expression gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Safely evaluate mathematical expressions with support for basic operations and math functions. Supported operations: +, -, *, /, , () Supported functions: sin, cos, tan, log, sqrt, abs, pow Note: Use this tool to evaluate a single mathematical expression. To compute descriptive statistics over a list of numbers, use the statistics tool instead. Examples: - "2 + 3 * 4" → 14 - "sqrt(16)" → 4.0 - "sin(3.14159/2)" → 1.0. It is categorised as a Read tool in the Math MCP Learning MCP Server, which means it retrieves data without modifying state.
Register the Math MCP Learning MCP server in PolicyLayer and add a rule for calc_expression: 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 Learning. Nothing to install.
calc_expression 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 calc_expression 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 calc_expression. 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.
calc_expression is provided by the Math MCP Learning MCP server (pypi:math-mcp-learning-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Math MCP Learning tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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