AI agents call get_cycle_by_id to retrieve information from Whoop without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing cycle data from the Whoop API without creating, modifying, deleting, or executing external actions. It is a straightforward data retrieval operation with no capability to change state. The blast radius of misuse is minimal — it can only expose personal health metrics that the authenticated user already has access to.
From the tool's definition Tool name is 'get_cycle_by_id' and description states 'Get a specific cycle by its ID from Whoop API' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get a specific cycle by its ID from Whoop API. It is categorised as a Read tool in the Whoop MCP Server, which means it retrieves data without modifying state.
Register the Whoop MCP server in PolicyLayer and add a rule for get_cycle_by_id: 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 Whoop. Nothing to install.
get_cycle_by_id 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_cycle_by_id 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_cycle_by_id. 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_cycle_by_id is provided by the Whoop MCP server (khushishelat/ctvidic_whoop-mcp-server). 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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