List available HeyGen voices for avatar videos including stock and cloned voices.
AI agents call list_voices to retrieve information from VideoGen Advisor without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates data (available voices) without creating, modifying, executing, deleting, or affecting any resources. It is a pure information lookup operation with no blast radius if misused by an AI agent.
From the tool's definition Tool name is 'list_voices' and description states it 'List[s] available HeyGen voices' — a query operation with no side effects.
Attacks that exploit this kind of access
List available HeyGen voices for avatar videos including stock and cloned voices. It is categorised as a Read tool in the VideoGen Advisor MCP Server, which means it retrieves data without modifying state.
Register the VideoGen Advisor 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 VideoGen Advisor. 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 VideoGen Advisor MCP server (m2ai-mcp-servers/mcp-videogen-router). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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