VO2 max estimate from Fitbit. Returned as a range string (e.g.
AI agents call get_cardio_fitness 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 queries and returns cardio fitness metrics (VO2 max) from Fitbit without creating, modifying, or deleting any data. It is a pure read operation that retrieves health information for display or analysis purposes.
From the tool's definition Tool name 'get_cardio_fitness' and description 'VO2 max estimate from Fitbit. Returned as a range string' indicate retrieval of existing health data with no modification or side effects.
Attacks that exploit this kind of access
VO2 max estimate from Fitbit. Returned as a range string (e.g. 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_cardio_fitness: 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_cardio_fitness 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_cardio_fitness 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_cardio_fitness. 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_cardio_fitness 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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