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What it does

Converts text into spoken audio using ElevenLabs voice synthesis. The generated MP3 is attached to the conversation so it can be played back, downloaded, or handed to other tools (for example, transcribed back via elevenlabs_speech_to_text).

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Key features

  • Curated enum of 10 voices spanning gender, accent, and tone — pick by name, no voice IDs required
  • Escape hatch for custom or cloned voices via raw voice_id
  • Latest eleven_v3 model by default; opt into eleven_multilingual_v2, eleven_flash_v2_5, or eleven_turbo_v2_5 for specialized tradeoffs
  • Configurable output format (MP3 at multiple bitrates, PCM, µ-law)
  • Output file is attached to the thread for downstream use

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Parameters

ParameterTypeRequiredDescription
textstringYesThe text to speak (up to 10,000 characters)
voiceenumNoOne of rachel, sarah, jessica, charlotte, lily, george, brian, daniel, will, charlie. Defaults to rachel.
voice_idstringNoRaw ElevenLabs voice ID (e.g. a cloned voice). Takes precedence over voice if set.
model_idenumNoeleven_v3 (default, most expressive), eleven_multilingual_v2 (29 languages), eleven_flash_v2_5 (~75ms latency), eleven_turbo_v2_5 (speed/quality balance)
output_formatenumNomp3_44100_128 (default), mp3_44100_192, mp3_22050_32, pcm_16000, pcm_22050, pcm_24000, pcm_44100, ulaw_8000
filenamestringNoFilename for the generated file. Extension is added automatically. Defaults to tts_<timestamp>.mp3.

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Voice reference

voiceGenderAccentBest for
rachelFAmericanCalm narration, explainers
sarahFAmericanSoft professional voiceover
jessicaFAmericanExpressive, upbeat reads
charlotteFBritishSultry narration
lilyFBritishWarm, conversational
georgeMBritishWarm narrator, storytelling
brianMAmericanDeep, authoritative
danielMBritishNews/authoritative
willMAmericanChill, conversational
charlieMAustralianCasual

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Common use cases

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Generate a short voiceover

text: "Welcome to the onboarding flow. Let's get you set up."
voice: "rachel"

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Use a specific model for low-latency playback

text: "Your order has shipped."
voice: "will"
model_id: "eleven_flash_v2_5"

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Use a custom cloned voice

text: "This is our branded voice."
voice_id: "<your_custom_voice_id>"

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Response

Returns a generated_files attachment with the MP3, plus metadata about the voice, model, output format, and file size. The attachment is immediately available to downstream tools in the same conversation.

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Setup

No per-user setup. ElevenLabs is configured at the platform level — just enable the tool on your agent in Control Hub > Edit Agent under the Audio section.