heart_rate_zones
Calculate heart rate training zones.
This record as markdown: /tools/io-tinyfn-tinyfn/heart-rate-zones.md
What heart_rate_zones does on TinyFn
AI agents call heart_rate_zones to retrieve information from TinyFn 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 | Age in years |
resting_hr | integer | — | Resting heart rate (optional) |
Parameters from the server's own tool schema.
Why heart_rate_zones is rated Low
This is a deterministic calculation tool that computes heart rate training zones (typically based on inputs like resting heart rate or max heart rate). It performs a read-only mathematical computation and returns results without modifying any state, creating persistent data, executing code, or triggering external systems. It aligns with the 'Read' category as a pure calculation/query function.
From the tool's definition Tool name 'heart_rate_zones' and description 'Calculate heart rate training zones' indicate a computation that retrieves or calculates derived data based on input parameters, with no side effects, data modification, or external operations.
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 TinyFn, 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 TinyFn, apply this rule, and every heart_rate_zones call is checked against it from then on.
Questions about heart_rate_zones
Calculate heart rate training zones. It is categorised as a Read tool in the TinyFn 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 TinyFn 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 TinyFn. 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 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.
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