whoop-set-access-token

THE RISK

Medium Risk

Why whoop-set-access-token needs a policy

While the tool itself doesn't directly access or delete WHOOP fitness data, setting an access token is a reversible configuration write operation that enables all downstream API access. It modifies the authenticated session state. The high severity reflects that misuse could redirect API calls to act on behalf of the authorized user, affecting the integrity of the API session.

From the tool's definition Tool name: 'whoop-set-access-token'. Tool description: 'Set the access token for API calls'. This tool modifies system state by storing/updating an authentication credential used for all subsequent API interactions.

Documented attack patterns abuse exactly the kind of access whoop-set-access-token gives an agent:

POLICY

How to control whoop-set-access-token

PolicyLayer is an MCP gateway — it sits between your AI agents and WHOOP MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for whoop-set-access-token:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "whoop-set-access-token": {
      "limits": [
        {
          "counter": "whoop-set-access-token_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

whoop-set-access-token stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register WHOOP MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More WHOOP MCP Server tools

Destructive whoop-revoke-user-access Revoke the access token granted by the user Write whoop-refresh-token Refresh access token using refresh token Read whoop-exchange-code-for-token Exchange authorization code for access token Read whoop-get-authorization-url Get the authorization URL for OAuth flow Read whoop-get-cycle-by-id Get the cycle for the specified ID Read whoop-get-cycle-collection Get all physiological cycles for a user, paginated Read whoop-get-recovery-collection Get all recovery data for a user, paginated Read whoop-get-recovery-for-cycle Get recovery data for a specific cycle

All 16 WHOOP MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about whoop-set-access-token

What does the whoop-set-access-token tool do? +

Set the access token for API calls. It is categorised as a Write tool in the WHOOP MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on whoop-set-access-token? +

Register the WHOOP MCP Server MCP server in PolicyLayer and add a rule for whoop-set-access-token: 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 MCP Server. Nothing to install.

What risk level is whoop-set-access-token? +

whoop-set-access-token is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit whoop-set-access-token? +

Yes. Add a rate_limit block to the whoop-set-access-token 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.

How do I block whoop-set-access-token completely? +

Set action: deny in the PolicyLayer policy for whoop-set-access-token. 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.

What MCP server provides whoop-set-access-token? +

whoop-set-access-token is provided by the WHOOP MCP Server MCP server (nissand/whoop-mcp-server-claude). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every WHOOP MCP Server tool call.

Start from WHOOP MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →