calculate_mean

Calculate arithmetic mean (average).

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/calculate-mean.md

WHAT IT DOES

What calculate_mean does on TinyFn

AI agents call calculate_mean 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
`numbers`	string	Yes	Comma-separated numbers

Parameters from the server's own tool schema.

RISK

Why calculate_mean is rated Low

This is a deterministic mathematical function that retrieves/computes a result from input data without creating, modifying, deleting, or executing anything. It aligns with the 'Read' category as it performs computation and returns a result without side effects. The tool is part of a suite of utility functions for AI agents and poses minimal security risk.

From the tool's definition Tool name is 'calculate_mean' and description states 'Calculate arithmetic mean (average).' This performs a pure mathematical calculation on provided data with no side effects, state changes, or external operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs calculate_mean 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 calculate_mean, this is the rule to start with:

calculate_mean Allowed

calculate_mean is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calculate_mean": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every calculate_mean call is checked against it from then on.

FAQ

Questions about calculate_mean

What does the calculate_mean tool do? +

Calculate arithmetic mean (average). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.

What parameters does calculate_mean accept? +

calculate_mean accepts 1 parameter: numbers. Required: numbers. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on calculate_mean? +

Register the TinyFn MCP server in PolicyLayer and add a rule for calculate_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.

What risk level is calculate_mean? +

calculate_mean is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit calculate_mean? +

Yes. Add a rate_limit block to the calculate_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.

How do I block calculate_mean completely? +

Set action: deny in the PolicyLayer policy for calculate_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.

What MCP server provides calculate_mean? +

calculate_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.

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