AI agents call getBodyMeasurements to retrieve information from FitBit MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves personal health data (body measurements) from the Fitbit API without modifying, executing, or deleting anything. While the description is empty, the naming convention and server context make it clear this is a data retrieval function. The blast radius of misuse is limited to exposing the user's private health information rather than causing operational damage or financial harm.
From the tool's definition Tool name 'getBodyMeasurements' indicates retrieval of body measurement data from Fitbit. The 'get' prefix strongly suggests a read-only query operation.
Documented attack patterns abuse exactly the kind of access getBodyMeasurements gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FitBit MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for getBodyMeasurements:
{
"version": "1",
"default": "deny",
"tools": {
"getBodyMeasurements": {}
}
}getBodyMeasurements is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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getBodyMeasurements. It is categorised as a Read tool in the FitBit MCP MCP Server, which means it retrieves data without modifying state.
Register the FitBit MCP server in PolicyLayer and add a rule for getBodyMeasurements: 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 MCP. Nothing to install.
getBodyMeasurements 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 getBodyMeasurements 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 getBodyMeasurements. 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.
getBodyMeasurements is provided by the FitBit MCP server (nitayrabi/fitbit-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FitBit MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 FitBit MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.