heart_rate_zones
Calculate target heart rate zones for exercise. Parameters: age — Age in years. resting_hr — Resting heart rate in bpm (default: 60).
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/heart-rate-zones.md
What heart_rate_zones does on X402 Middleware
AI agents call heart_rate_zones 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 | |
resting_hr | integer | — |
Parameters from the server's own tool schema.
Why heart_rate_zones is rated Low
This is a read-only calculation tool that retrieves derived information (heart rate zones) based on input parameters. It has no side effects, does not modify persistent data, does not execute arbitrary code or commands, does not delete anything, and does not involve financial operations.
From the tool's definition The tool 'heart_rate_zones' calculates target heart rate zones based on provided age and resting heart rate parameters. The description contains no verbs indicating data modification, deletion, code execution, or financial transactions.
Attacks that exploit this kind of access
The rule that runs heart_rate_zones 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 heart_rate_zones, this is the rule to start with:
heart_rate_zones 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 heart_rate_zones call is checked against it from then on.
Questions about heart_rate_zones
Calculate target heart rate zones for exercise. Parameters: age — Age in years. resting_hr — Resting heart rate in bpm (default: 60). It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
heart_rate_zones accepts 2 parameters: age, resting_hr. Required: age. 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 heart_rate_zones: 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.
heart_rate_zones 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 heart_rate_zones 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 heart_rate_zones. 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.
heart_rate_zones 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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