text_to_voice_preview_stream
Text To Voice Preview Streaming. Returns audio/mpeg bytes; pass output_path to save them.
This record as markdown: /tools/aiwerk-mcp-server-elevenlabs/text-to-voice-preview-stream.md
What text_to_voice_preview_stream does on Elevenlabs
AI agents use text_to_voice_preview_stream to create or update resources in Elevenlabs, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Elevenlabs environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
output_path | string | — | Where to write the returned bytes. Relative paths resolve against ELEVENLABS_OUTPUT_DIR. Omit it to get the data inline as base64 (small files only). |
generated_voice_id | string | Yes | The generated_voice_id to stream. |
Parameters from the server's own tool schema.
Why text_to_voice_preview_stream is rated Medium
An AI agent can call text_to_voice_preview_stream faster than any human can review: one bad instruction and it creates or modifies resources in Elevenlabs by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
The rule that runs text_to_voice_preview_stream safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Elevenlabs, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For text_to_voice_preview_stream, this is the rule to start with:
text_to_voice_preview_stream stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Elevenlabs, apply this rule, and every text_to_voice_preview_stream call is checked against it from then on.
Questions about text_to_voice_preview_stream
Text To Voice Preview Streaming. Returns audio/mpeg bytes; pass output_path to save them. It is categorised as a Write tool in the Elevenlabs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
text_to_voice_preview_stream accepts 2 parameters: output_path, generated_voice_id. Required: generated_voice_id. The full parameter table on this page comes from the server's own tool schema.
Register the Elevenlabs MCP server in PolicyLayer and add a rule for text_to_voice_preview_stream: 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. Nothing to install.
text_to_voice_preview_stream is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the text_to_voice_preview_stream 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 text_to_voice_preview_stream. 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.
text_to_voice_preview_stream is provided by the Elevenlabs MCP server (@aiwerk/mcp-server-elevenlabs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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