Get heart rate data in different time zones for an activity Args: activity_id: ID of the activity to retrieve heart rate time zone data for
AI agents call get_activity_hr_in_timezones 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 and queries existing fitness data (heart rate information) from Garmin Connect without modifying, deleting, or executing operations. It is a straightforward read operation with minimal risk even if misused by an AI agent, as it only exposes personal health metrics the user has already authorized the MCP server to access.
From the tool's definition Tool name 'get_activity_hr_in_timezones' and description 'Get heart rate data in different time zones for an activity' indicate data retrieval. The function takes only an activity_id argument and performs no modifications, deletions, or external operations.
Documented attack patterns abuse exactly the kind of access get_activity_hr_in_timezones 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_activity_hr_in_timezones:
{
"version": "1",
"default": "deny",
"tools": {
"get_activity_hr_in_timezones": {}
}
}get_activity_hr_in_timezones is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get heart rate data in different time zones for an activity Args: activity_id: ID of the activity to retrieve heart rate time zone data for. 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_activity_hr_in_timezones: 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_activity_hr_in_timezones 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_in_timezones 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_in_timezones. 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_in_timezones 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.
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126 Garmin MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.