AI agents call list_emotions to retrieve information from VOICEPEAK MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns information about available emotions for narrators. It performs no writes, deletes, code execution, or financial operations. The only risk is information disclosure, which is minimal for publicly queryable metadata about voice synthesis features. Confidence is high because the description clearly indicates a read-only list operation.
From the tool's definition Tool name is 'list_emotions' and description states it 'List available emotions for a narrator' — a pure query operation with no side effects, data modification, or external state changes.
Documented attack patterns abuse exactly the kind of access list_emotions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VOICEPEAK MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_emotions:
{
"version": "1",
"default": "deny",
"tools": {
"list_emotions": {}
}
}list_emotions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available emotions for a narrator. It is categorised as a Read tool in the VOICEPEAK MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VOICEPEAK MCP Server MCP server in PolicyLayer and add a rule for list_emotions: 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 VOICEPEAK MCP Server. Nothing to install.
list_emotions 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_emotions 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_emotions. 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_emotions is provided by the VOICEPEAK MCP Server MCP server (k2wanko/voicepeak-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VOICEPEAK MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 VOICEPEAK MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.