This record as markdown: /tools/io-tinyfn-tinyfn/calculate-range.md
What calculate_range does on TinyFn
AI agents call calculate_range 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.
Why calculate_range is rated Low
This is a deterministic utility function that performs a simple mathematical operation (subtraction of minimum from maximum). It retrieves no sensitive data, modifies nothing, executes no external code or commands, and has no destructive or financial implications. It falls squarely into the Read category as a data retrieval and computation tool with negligible security risk.
From the tool's definition Tool name 'calculate_range' and description 'Calculate range (max - min)' indicate a pure mathematical computation that reads input values and returns a result. No side effects, no data modification, no external operations.
Attacks that exploit this kind of access
The rule that runs calculate_range 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_range, this is the rule to start with:
calculate_range 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 calculate_range call is checked against it from then on.
Questions about calculate_range
Calculate range (max - min). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_range 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 calculate_range: 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.
calculate_range 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 calculate_range 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 calculate_range. 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.
calculate_range 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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