This record as markdown: /tools/io-tinyfn-tinyfn/calculate-bmi.md
What calculate_bmi does on TinyFn
AI agents call calculate_bmi 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 |
|---|---|---|---|
height_cm | number | Yes | Height in centimeters |
weight_kg | number | Yes | Weight in kilograms |
Parameters from the server's own tool schema.
Why calculate_bmi is rated Low
This is a deterministic mathematical calculation tool that retrieves no data, modifies nothing, executes no code or external operations, and performs no destructive or financial actions. It fits the Read category as a query-like computation that produces output based on inputs without any state changes or side effects.
From the tool's definition Tool name 'calculate_bmi' and description 'Calculate Body Mass Index (BMI)' indicate a pure computational function that takes inputs (height, weight) and returns a calculated value with no side effects, no data persistence, and no external operations.
Attacks that exploit this kind of access
The rule that runs calculate_bmi 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_bmi, this is the rule to start with:
calculate_bmi 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_bmi call is checked against it from then on.
Questions about calculate_bmi
Calculate Body Mass Index (BMI). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_bmi accepts 2 parameters: height_cm, weight_kg. Required: height_cm, weight_kg. 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_bmi: 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_bmi 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_bmi 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_bmi. 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_bmi 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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