Fitbit sleep logs (v1.2) for a date, including stage data (deep/light/rem/wake) when the device captured them. Defaults to today (JST). Cached 1h.
AI agents call get_sleep 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 sleep stage information from Fitbit without creating, modifying, or deleting data. It has no side effects beyond querying user health metrics. While health data is sensitive, unauthorized disclosure of sleep logs poses minimal immediate risk compared to write or destructive operations. The 1-hour cache further limits exposure.
From the tool's definition Tool name 'get_sleep' and description 'Fitbit sleep logs for a date' indicate data retrieval with no modification capability. The verb 'get' and phrase 'when the device captured them' confirm read-only access to historical sleep data.
Attacks that exploit this kind of access
Fitbit sleep logs (v1.2) for a date, including stage data (deep/light/rem/wake) when the device captured them. Defaults to today (JST). 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_sleep: 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_sleep 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_sleep 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_sleep. 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_sleep 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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