AI agents call harmonic_mean to retrieve information from TinyFn without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
numbers | string | Yes | Comma-separated positive numbers |
Parameters from the server's own tool schema.
This is a pure mathematical function that takes numeric inputs and returns a calculated result. It has no side effects, does not interact with external systems, and does not create, modify, or destroy any data. It falls squarely into the Read category as a deterministic computation tool, consistent with the server's purpose of providing 500+ mathematical and utility functions for AI agents.
From the tool's definition Tool name 'harmonic_mean' with description 'Calculate harmonic mean.' indicates a mathematical computation that retrieves/calculates a result from input parameters without modifying any data, executing code, deleting data, or affecting financial systems.
Attacks that exploit this kind of access
Calculate harmonic mean. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
harmonic_mean accepts 1 parameter: numbers. Required: numbers. 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 harmonic_mean: 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.
harmonic_mean 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 harmonic_mean 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 harmonic_mean. 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.
harmonic_mean 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.
harmonic_mean is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →