Daily resting heart rate and time-in-zone for each day in the range. Cached 1h.
AI agents call get_heart_rate_range to retrieve information from Fitbit Googlehealth without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical heart rate metrics from the user's Fitbit account. It performs no side effects, creates no data, executes no external operations, and deletes nothing. The only risk is unauthorized access to personal health data, which is mitigated by standard MCP authentication and user consent. Severity is low because heart rate data alone cannot directly harm the user or commit them to obligations.
From the tool's definition Tool name 'get_heart_rate_range' and description 'Daily resting heart rate and time-in-zone for each day in the range' indicate data retrieval with no modification or deletion.
Attacks that exploit this kind of access
Daily resting heart rate and time-in-zone for each day in the range. Cached 1h. It is categorised as a Read tool in the Fitbit Googlehealth MCP Server, which means it retrieves data without modifying state.
Register the Fitbit Googlehealth MCP server in PolicyLayer and add a rule for get_heart_rate_range: 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 Fitbit Googlehealth. Nothing to install.
get_heart_rate_range 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_heart_rate_range 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_heart_rate_range. 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_heart_rate_range is provided by the Fitbit Googlehealth MCP server (tachibanayu24/fitbit-googlehealth-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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