Convert text to speech with streaming (for longer texts or real-time generation)
AI agents invoke elevenlabs_stream_text_to_speech to trigger actions in ElevenLabs MCP Server. 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.
This tool initiates a streaming external operation via the ElevenLabs API, making it Execute rather than Read. It consumes API credits/quota and produces side effects (streaming audio output) whose scope depends on the input text length. Misuse could drain API quotas or be used to generate large volumes of audio content.
From the tool's definition 'Convert text to speech with streaming (for longer texts or real-time generation)' — triggers an external API operation that streams audio in real-time
Attacks that exploit this kind of access
Convert text to speech with streaming (for longer texts or real-time generation). It is categorised as a Execute tool in the ElevenLabs MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ElevenLabs MCP Server MCP server in PolicyLayer and add a rule for elevenlabs_stream_text_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 Server. Nothing to install.
elevenlabs_stream_text_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 elevenlabs_stream_text_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 elevenlabs_stream_text_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.
elevenlabs_stream_text_to_speech is provided by the ElevenLabs MCP Server MCP server (mafzaal/elevan-labs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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