AI agents call calculate_bmi 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 |
|---|---|---|---|
height_cm | number | Yes | Height in centimeters |
weight_kg | number | Yes | Weight in kilograms |
Parameters from the server's own tool schema.
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
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.
calculate_bmi 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 →