This record as markdown: /tools/io-tinyfn-tinyfn/nth-prime.md
What nth_prime does on TinyFn
AI agents call nth_prime to retrieve information from TinyFn without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
n | integer | Yes | Which prime number (1=2, 2=3, etc.) |
Parameters from the server's own tool schema.
Why nth_prime is rated Low
This is a deterministic mathematical function that retrieves/computes a value based on input (the index n) without modifying any state, executing external operations, or accessing sensitive systems. It is clearly a Read operation with minimal risk — an AI agent could only misuse it by requesting computationally expensive prime calculations, which has negligible blast radius.
From the tool's definition Tool name is 'nth_prime' and description states 'Get the nth prime number' — a pure mathematical query operation with no side effects, data modification, execution of arbitrary code, or financial implications.
Attacks that exploit this kind of access
The rule that runs nth_prime safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For nth_prime, this is the rule to start with:
nth_prime is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every nth_prime call is checked against it from then on.
Questions about nth_prime
Get the nth prime number. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
nth_prime accepts 1 parameter: n. Required: n. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for nth_prime: 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 TinyFn. Nothing to install.
nth_prime 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 nth_prime 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 nth_prime. 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.
nth_prime is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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