list_api_usage

THE RISK

Low Risk

Why list_api_usage needs a policy

This tool retrieves and queries usage statistics and metrics. It performs no mutations, executions, or destructive actions. It is informational only, making it a Read category tool with low severity since exposure would only leak operational metrics without enabling harmful actions.

From the tool's definition Tool name 'list_api_usage' and description 'Get API usage statistics including active scout counts, rate limits, and activity metrics' indicate a retrieval of monitoring data without modification or side effects.

Documented attack patterns abuse exactly the kind of access list_api_usage gives an agent:

POLICY

How to control list_api_usage

PolicyLayer is an MCP gateway — it sits between your AI agents and Yutori MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_api_usage:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_api_usage": {}
  }
}

list_api_usage is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_api_usage

What does the list_api_usage tool do? +

Get API usage statistics including active scout counts, rate limits, and activity metrics. It is categorised as a Read tool in the Yutori MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_api_usage? +

Register the Yutori MCP server in PolicyLayer and add a rule for list_api_usage: 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 Yutori MCP. Nothing to install.

What risk level is list_api_usage? +

list_api_usage is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_api_usage? +

Yes. Add a rate_limit block to the list_api_usage 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 list_api_usage completely? +

Set action: deny in the PolicyLayer policy for list_api_usage. 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 list_api_usage? +

list_api_usage is provided by the Yutori MCP server (yutori-ai/yutori-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Yutori MCP tool call.

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

CHECK YOUR STACK →