Get time spent in each heart rate zone during an activity
AI agents call get_activity_hr_zones to retrieve information from Garmin Connect without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing activity heart rate zone data. It performs a read-only retrieval of metrics without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal, as an AI agent cannot cause harm by querying historical fitness metrics.
From the tool's definition The tool description states it retrieves "time spent in each heart rate zone during an activity" — a query operation with no side effects or data modification.
Documented attack patterns abuse exactly the kind of access get_activity_hr_zones gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Garmin Connect, and nothing reaches the server without passing your rules. This is the rule we recommend for get_activity_hr_zones:
{
"version": "1",
"default": "deny",
"tools": {
"get_activity_hr_zones": {}
}
}get_activity_hr_zones is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get time spent in each heart rate zone during an activity. It is categorised as a Read tool in the Garmin Connect MCP Server, which means it retrieves data without modifying state.
Register the Garmin Connect MCP server in PolicyLayer and add a rule for get_activity_hr_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 Garmin Connect. Nothing to install.
get_activity_hr_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 get_activity_hr_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 get_activity_hr_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.
get_activity_hr_zones is provided by the Garmin Connect MCP server (nicolasvegam/garmin-connect-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 97 Garmin Connect tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
97 Garmin Connect tools catalogued and risk-classified — across an index of 42,500+ MCP servers.