AI agents call get_activities_by_date to retrieve information from Garmin 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 activity data within a date range from Garmin Connect. It performs a read-only operation with no capacity to modify, delete, or execute actions. The blast radius is minimal—unauthorized access could expose personal health data (moderate privacy concern) but cannot alter workouts, trigger external actions, or cause financial impact.
From the tool's definition Tool name 'get_activities_by_date' and description 'Return activities between start_date and end_date' indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Return activities between start_date and end_date (YYYY-MM-DD). End defaults to today. It is categorised as a Read tool in the Garmin MCP Server, which means it retrieves data without modifying state.
Register the Garmin MCP server in PolicyLayer and add a rule for get_activities_by_date: 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. Nothing to install.
get_activities_by_date 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_activities_by_date 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_activities_by_date. 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_activities_by_date is provided by the Garmin MCP server (marcelohensantos/garmin-mcp). 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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