Get Heart Rate Variability (HRV) data for a given date.
AI agents call get_hrv_data to retrieve information from Mcp Garmin without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves Heart Rate Variability health metrics from Garmin Connect. It performs a query operation with no ability to modify, delete, or execute actions. The data accessed is personal health information, but the tool itself only reads and returns it. Misuse by an AI agent would be limited to unauthorized data disclosure rather than harmful modifications or financial impact.
From the tool's definition Tool name 'get_hrv_data' and server description explicitly state 'read-only access' to 'daily health metrics'. The verb 'Get' and the read-only design pattern confirm retrieval without side effects.
Attacks that exploit this kind of access
Get Heart Rate Variability (HRV) data for a given date. It is categorised as a Read tool in the Mcp Garmin MCP Server, which means it retrieves data without modifying state.
Register the Mcp Garmin 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 Mcp Garmin. 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 Mcp Garmin MCP server (obrien-matthew/mcp-garmin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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