AI agents call get_body_battery 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 only queries and retrieves health metric data (body battery statistics) from Garmin Connect. It performs no write, execute, destructive, or financial operations. The read-only nature of the server and the passive retrieval semantics of 'get' clearly indicate a Read category tool with minimal risk of misuse.
From the tool's definition Tool name 'get_body_battery' uses 'get' prefix; server description explicitly states 'read-only MCP tools'; tool retrieves 'Body battery values across the day' with no mutation or destructive operations described.
Attacks that exploit this kind of access
Body battery values across the day, plus min, max, charged, and drained totals. 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_body_battery: 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_body_battery 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_body_battery 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_body_battery. 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_body_battery is provided by the Garmin MCP server (tyler-irving/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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