speech_to_speech
Transforms voice in audio. Returns: audio file with new voice. Use when: changing speaker voice in existing audio.
This record as markdown: /tools/199-mcp-mcp-elevenlabs/speech-to-speech.md
What speech_to_speech does on ElevenLabs MCP Enhanced
AI agents invoke speech_to_speech to trigger actions in ElevenLabs MCP Enhanced. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why speech_to_speech is rated High
This tool takes existing audio and applies a voice transformation to it, producing new audio output. It executes a voice conversion operation with external effects (audio synthesis via ElevenLabs API). It is not purely a read (it produces new artifacts), not a write in the traditional sense (it transforms rather than persistently stores data), and not destructive (original audio is unchanged).
From the tool's definition 'Transforms voice in audio' and 'changing speaker voice in existing audio' — processes existing audio and produces a transformed output
Attacks that exploit this kind of access
The rule that runs speech_to_speech safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ElevenLabs MCP Enhanced, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For speech_to_speech, this is the rule to start with:
speech_to_speech stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ElevenLabs MCP Enhanced, apply this rule, and every speech_to_speech call is checked against it from then on.
Questions about speech_to_speech
Transforms voice in audio. Returns: audio file with new voice. Use when: changing speaker voice in existing audio. It is categorised as a Execute tool in the ElevenLabs MCP Enhanced MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ElevenLabs MCP Enhanced MCP server in PolicyLayer and add a rule for speech_to_speech: 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 Enhanced. Nothing to install.
speech_to_speech is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the speech_to_speech 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 speech_to_speech. 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.
speech_to_speech is provided by the ElevenLabs MCP Enhanced MCP server (199-mcp/mcp-elevenlabs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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