Calculates the arctangent of a number in radians
AI agents call arctan to retrieve information from Math-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
number | number | — | The number to find the arctangent of |
Parameters from the server's own tool schema.
This is a mathematical utility function that takes a numeric input and returns a computed value. It performs no state changes, data persistence, external calls, or irreversible operations. It is analogous to a lookup or retrieval of a mathematical constant/computation, making it a Read category tool with low severity risk.
From the tool's definition Tool name 'arctan' and description 'Calculates the arctangent of a number in radians' indicate a pure mathematical computation that retrieves a calculated result without side effects, modifying data, or executing external operations.
Documented attack patterns abuse exactly the kind of access arctan gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Math-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for arctan:
{
"version": "1",
"default": "deny",
"tools": {
"arctan": {}
}
}arctan is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calculates the arctangent of a number in radians. It is categorised as a Read tool in the Math-MCP MCP Server, which means it retrieves data without modifying state.
arctan accepts 1 parameter: number. The full parameter table on this page comes from the server's own tool schema.
Register the Math- MCP server in PolicyLayer and add a rule for arctan: 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. Nothing to install.
arctan 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 arctan 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 arctan. 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.
arctan is provided by the Math- MCP server (EthanHenrickson/math-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Math-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
22 Math-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.