Files
hermes-agent/website/docs/user-guide/features/tts.md
teknium1 d578d06f59 docs: comprehensive accuracy audit fixes (35+ corrections)
CRITICAL fixes:
- Installation: Remove false prerequisites (installer auto-installs everything except git)
- Tools: Remove non-existent 'web_crawl' tool from tools table
- Memory: Remove non-existent 'read' action (only add/replace/remove exist)
- Code execution: Fix 'search' to 'search_files' in sandbox tools list
- CLI commands: Fix --model/--provider/--toolsets/--verbose as chat subcommand flags

IMPORTANT fixes:
- Installation: Add missing installer features (Node.js, ripgrep, ffmpeg, skills seeding)
- Installation: Add 6 missing package extras to table (mcp, honcho, tts-premium, etc)
- Installation: Fix mkdir to include all directories the installer creates
- Quickstart: Add OpenAI Codex to provider table
- CLI: Fix all 'hermes --flag' to 'hermes chat --flag' across all docs
- Configuration: Remove non-existent --max-turns CLI flag
- Tools: Fix 'search' to 'search_files', add missing 'process' tool
- Skills: Remove skills_categories() (not a registered tool)
- Cron: Remove unsupported 'daily at 9am' schedule format
- TTS: Fix output directory to ~/.hermes/audio_cache/
- Delegation: Clarify depth limit wording
- Architecture: Fix default model, chat() signature, file names
- Contributing: Fix Python requirement from 3.11+ to 3.10+
- CLI reference: Add missing commands (login, tools, sessions subcommands)
- Env vars: Fix TERMINAL_DOCKER_IMAGE default, add HERMES_MODEL
2026-03-05 06:50:22 -08:00

2.4 KiB

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9 Voice & TTS Text-to-speech and voice message transcription across all platforms

Voice & TTS

Hermes Agent supports both text-to-speech output and voice message transcription across all messaging platforms.

Text-to-Speech

Convert text to speech with three providers:

Provider Quality Cost API Key
Edge TTS (default) Good Free None needed
ElevenLabs Excellent Paid ELEVENLABS_API_KEY
OpenAI TTS Good Paid VOICE_TOOLS_OPENAI_KEY

Platform Delivery

Platform Delivery Format
Telegram Voice bubble (plays inline) Opus .ogg
Discord Audio file attachment MP3
WhatsApp Audio file attachment MP3
CLI Saved to ~/.hermes/audio_cache/ MP3

Configuration

# In ~/.hermes/config.yaml
tts:
  provider: "edge"              # "edge" | "elevenlabs" | "openai"
  edge:
    voice: "en-US-AriaNeural"   # 322 voices, 74 languages
  elevenlabs:
    voice_id: "pNInz6obpgDQGcFmaJgB"  # Adam
    model_id: "eleven_multilingual_v2"
  openai:
    model: "gpt-4o-mini-tts"
    voice: "alloy"              # alloy, echo, fable, onyx, nova, shimmer

Telegram Voice Bubbles & ffmpeg

Telegram voice bubbles require Opus/OGG audio format:

  • OpenAI and ElevenLabs produce Opus natively — no extra setup
  • Edge TTS (default) outputs MP3 and needs ffmpeg to convert:
# Ubuntu/Debian
sudo apt install ffmpeg

# macOS
brew install ffmpeg

# Fedora
sudo dnf install ffmpeg

Without ffmpeg, Edge TTS audio is sent as a regular audio file (playable, but shows as a rectangular player instead of a voice bubble).

:::tip If you want voice bubbles without installing ffmpeg, switch to the OpenAI or ElevenLabs provider. :::

Voice Message Transcription

Voice messages sent on Telegram, Discord, WhatsApp, or Slack are automatically transcribed and injected as text into the conversation. The agent sees the transcript as normal text.

Provider Model Quality Cost
OpenAI Whisper whisper-1 (default) Good Low
OpenAI GPT-4o gpt-4o-mini-transcribe Better Medium
OpenAI GPT-4o gpt-4o-transcribe Best Higher

Requires VOICE_TOOLS_OPENAI_KEY in ~/.hermes/.env.

Configuration

# In ~/.hermes/config.yaml
stt:
  enabled: true
  model: "whisper-1"