Thanks — I’m happy to help get ElevenLabs TTS working with

agents-js

. I’ll walk through the expected setup and then ask a few targeted questions so I can troubleshoot the specific error you’re seeing. What I’m responding to: how to use the ElevenLabs TTS plugin with

agents-js

(Node) and why you might still be getting ElevenLabs errors. Quick checklist — what you must have in place • Install the ElevenLabs plugin package: ◦ pnpm add "@livekit/agents-plugin-elevenlabs@1.x" • Provide your ElevenLabs API key in env as

ELEVEN_API_KEY

so the plugin can authenticate. • Configure

AgentSession

to use the plugin, for example:

import * as elevenlabs from '@livekit/agents-plugin-elevenlabs';

  const session = new voice.AgentSession({
    tts: new elevenlabs.TTS({
      voice: { id: "ODq5zmih8GrVes37Dizd" },
      model: "eleven_multilingual_v2"
    }),
    // other config...
  });

• Use compatible SDK versions (e.g.,

@livekit/agents

v1.0.7+ for Node). Common causes of ElevenLabs errors (and quick fixes) • Authentication error: confirm

ELEVEN_API_KEY

is set in the environment your Node process runs in and that the key is valid (not expired or revoked). • Rate limiting or permission errors: verify your ElevenLabs account hasn’t hit limits and that the key has correct permissions. • Wrong voice/model IDs: use a supported voice ID and supported model (e.g.,

eleven_multilingual_v2

); custom/cloned voices require using the ElevenLabs account via the plugin (not LiveKit Inference voice names). • Mixing plugin vs Inference syntax: don’t pass model descriptors like

"elevenlabs/..."

to LiveKit Inference when you’re using the plugin. Use the plugin’s

TTS

configuration instead. • Network / CORS / proxy issues: ensure your environment can reach ElevenLabs endpoints and that any proxy/firewall allows outbound calls. Next I need from you to diagnose the specific error Please share: 1. The exact error message or stack trace you’re seeing (copy/paste the full error). 2. A minimal reproduction snippet of how you instantiate the

AgentSession

/

TTS

(remove secrets). 3. Which versions you’re using: ◦

@livekit/agents

(agents-js) version ◦

@livekit/agents-plugin-elevenlabs

version ◦ Node.js version 1. Whether

ELEVEN_API_KEY

is set in your runtime environment and how you’re setting it (e.g.,

.env

, CI secret, system env). 2. Whether the failing call is during startup, when you call a TTS method, or at runtime while streaming. If you prefer, paste the error and the short code snippet and I’ll point out the likely cause and exact lines to change. Sources: ElevenLabs TTS plugin guide | LiveKit Documentation | Models overview | LiveKit Documentation | ElevenLabs TTS | LiveKit Documentation