AI agents call get_unit_system 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 only reads configuration data (unit system preference) from the user's profile. It performs a simple query operation that does not create, modify, delete, execute code, or involve financial transactions. The data retrieved is non-sensitive profile metadata with minimal blast radius if exposed.
From the tool's definition Tool name 'get_unit_system' and description 'Get user's preferred unit system from profile' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_unit_system 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_unit_system:
{
"version": "1",
"default": "deny",
"tools": {
"get_unit_system": {}
}
}get_unit_system is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get user's preferred unit system from profile. 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_unit_system: 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_unit_system 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_unit_system 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_unit_system. 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_unit_system 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.