AI agents call list_voices to retrieve information from ElevenLabs MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only enumeration of available voices from the ElevenLabs API. It queries data, returns a list, and has no capability to modify, delete, or execute operations. The blast radius of misuse is minimal—an AI agent could only learn what voices exist, which is not sensitive information and causes no harm.
From the tool's definition Tool name is 'list_voices' and description states 'List all available voices' - a straightforward query operation that retrieves voice metadata without side effects.
Documented attack patterns abuse exactly the kind of access list_voices gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ElevenLabs MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_voices:
{
"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.
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List all available voices. It is categorised as a Read tool in the ElevenLabs MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ElevenLabs MCP Server 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 ElevenLabs MCP Server. Nothing to install.
list_voices 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 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.
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.
list_voices is provided by the ElevenLabs MCP Server MCP server (mamertofabian/elevenlabs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ElevenLabs MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
6 ElevenLabs MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.