list_voices

THE RISK

Low Risk

Why list_voices needs a policy

This tool retrieves information about available voices without creating, modifying, deleting, or executing any operations. It is a straightforward read operation that returns static or semi-static configuration data. The constraint about api_host does not change the fundamental nature of the action.

From the tool's definition Tool name 'list_voices' and description 'List all available voices' indicate a query/retrieval operation with no side effects or data modification.

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

POLICY

How to control list_voices

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

policy.json

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

list_voices 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 MiniMax MCP JS — 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

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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_voices

What does the list_voices tool do? +

List all available voices. Only supported when api_host is https://api.minimax.chat. It is categorised as a Read tool in the MiniMax MCP JS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_voices? +

Register the MiniMax MCP JS MCP server in PolicyLayer and add a rule for list_voices: 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 MiniMax MCP JS. Nothing to install.

What risk level is list_voices? +

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

Can I rate-limit list_voices? +

Yes. Add a rate_limit block to the list_voices 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_voices completely? +

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

list_voices is provided by the MiniMax MCP JS MCP server (minimax-ai/minimax-mcp-js). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MiniMax MCP JS tool call.

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

CHECK YOUR STACK →