AI agents call calculate_bmr 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 |
|---|---|---|---|
age | integer | Yes | Age in years |
sex | string | Yes | Sex: male or female |
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 pure computational tool that takes input parameters (typically height, weight, age, sex) and returns a calculated value. It retrieves no data from systems, modifies no state, executes no external operations, and has no destructive or financial implications. It fits squarely within the Read category as a data calculation/derivation tool with no side effects.
From the tool's definition Tool description states it 'Calculate[s] Basal Metabolic Rate (BMR) using Mifflin-St Jeor equation' — a deterministic mathematical calculation with no side effects.
Attacks that exploit this kind of access
Calculate Basal Metabolic Rate (BMR) using Mifflin-St Jeor equation. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
calculate_bmr accepts 4 parameters: age, sex, height_cm, weight_kg. Required: age, sex, 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_bmr: 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_bmr 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_bmr 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_bmr. 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_bmr 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_bmr 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.
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