calculate_bmi
Calculate BMI (Body Mass Index) from weight and height. Parameters: weight — Weight (kg for metric, lbs for imperial). height — Height (cm for metric, inches for imperial). unit — 'metric' (default) or 'imperial'.
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/calculate-bmi.md
What calculate_bmi does on X402 Middleware
AI agents call calculate_bmi 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 |
|---|---|---|---|
unit | string | — | |
height | number | Yes | |
weight | number | Yes |
Parameters from the server's own tool schema.
Why calculate_bmi is rated Low
This tool performs a purely computational calculation on provided input parameters and returns a result. It has no side effects, does not modify any data, does not execute external code or commands, does not delete or overwrite information, and does not involve financial transactions.
From the tool's definition Tool name 'calculate_bmi' and description indicate it 'Calculate[s] BMI (Body Mass Index) from weight and height' with parameters for weight, height, and unit. No modification, deletion, execution, or financial transaction occurs.
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 X402 Middleware, 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 X402 Middleware, apply this rule, and every calculate_bmi call is checked against it from then on.
Questions about calculate_bmi
Calculate BMI (Body Mass Index) from weight and height. Parameters: weight — Weight (kg for metric, lbs for imperial). height — Height (cm for metric, inches for imperial). unit — 'metric' (default) or 'imperial'. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
calculate_bmi accepts 3 parameters: unit, height, weight. Required: 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 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 X402 Middleware. 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 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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