bmr_calc
Calculate Basal Metabolic Rate (BMR) using Mifflin-St Jeor equation. Parameters: weight — Weight in kg. height — Height in cm. age — Age in years. sex — 'male' (default) or 'female'.
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/bmr-calc.md
What bmr_calc does on X402 Middleware
AI agents call bmr_calc to retrieve information from X402 Middleware 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 |
|---|---|---|---|
age | integer | Yes | |
sex | string | — | |
height | number | Yes | |
weight | number | Yes |
Parameters from the server's own tool schema.
Why bmr_calc is rated Low
This is a pure computational utility that retrieves a calculated result with no side effects. It matches the Read category definition: 'retrieves or queries data; no side effects.' The severity is low because misuse of this tool cannot cause harm—it only produces a numeric health metric.
From the tool's definition Tool performs a mathematical calculation (Basal Metabolic Rate using Mifflin-St Jeor equation) based on provided parameters (weight, height, age, sex). No data is created, modified, deleted, or persisted.
Attacks that exploit this kind of access
The rule that runs bmr_calc safely
PolicyLayer is an MCP gateway: it sits between your AI agents and X402 Middleware, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For bmr_calc, this is the rule to start with:
bmr_calc 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 X402 Middleware, apply this rule, and every bmr_calc call is checked against it from then on.
Questions about bmr_calc
Calculate Basal Metabolic Rate (BMR) using Mifflin-St Jeor equation. Parameters: weight — Weight in kg. height — Height in cm. age — Age in years. sex — 'male' (default) or 'female'. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
bmr_calc accepts 4 parameters: age, sex, height, weight. Required: age, height, weight. The full parameter table on this page comes from the server's own tool schema.
Register the X402 Middleware MCP server in PolicyLayer and add a rule for bmr_calc: 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 X402 Middleware. Nothing to install.
bmr_calc 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 bmr_calc 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 bmr_calc. 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.
bmr_calc is provided by the X402 Middleware MCP server (@gadgethumans/x402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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