Get Heart Rate Variability (HRV) data Args: date: Date in YYYY-MM-DD format return_timeseries: If True, include detailed 5-minute HRV readings (can be large)
AI agents call get_hrv_data to retrieve information from Garmin MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves personal health data (Heart Rate Variability readings) from Garmin Connect without any capability to modify, delete, or execute operations. It is a straightforward data query with no side effects. The blast radius of misuse is limited to potential unauthorized access to personal health metrics, which is a privacy concern but does not enable destructive or financial harm.
From the tool's definition Tool name is 'get_hrv_data' with description 'Get Heart Rate Variability (HRV) data'. The verb 'Get' and the absence of any modification, deletion, or execution capability indicate a read-only retrieval operation.
Documented attack patterns abuse exactly the kind of access get_hrv_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Garmin MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_hrv_data:
{
"version": "1",
"default": "deny",
"tools": {
"get_hrv_data": {}
}
}get_hrv_data 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 Heart Rate Variability (HRV) data Args: date: Date in YYYY-MM-DD format return_timeseries: If True, include detailed 5-minute HRV readings (can be large). It is categorised as a Read tool in the Garmin MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Garmin MCP Server MCP server in PolicyLayer and add a rule for get_hrv_data: 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 MCP Server. Nothing to install.
get_hrv_data 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_hrv_data 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_hrv_data. 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_hrv_data is provided by the Garmin MCP Server MCP server (taxuspt/garmin_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 126 Garmin MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
126 Garmin MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.