leo-elevenlabs-mcp
An MCP server that provides ElevenLabs text-to-speech as a Leo provider package, enabling text synthesis to base64 audio and voice listing through the Leo speech pipeline.
README
leo-elevenlabs-mcp
ElevenLabs text-to-speech as a Leo provider package, over MCP.
Leo's speech pipeline doesn't do this itself — it resolves a provider and asks that. This server is one, reachable as a package the hub installs at runtime rather than one it has to be rebuilt for.
What it answers
The tts role in leo_mcp::providers:
synthesize({ text, voice? }) -> { audio_base64 }
voices({}) -> { voices: [{ id, name, detail? }] }
Results come back as JSON in a text content block, which is the convention the hub's bridge reads.
Configuration
Handed to this process by Leo as environment variables under their settings
keys, verbatim and lower-case — only the keys the descriptor declares in
entitlements.settings_read and the owner consented to, never the whole
settings table.
| env | where it comes from |
|---|---|
elevenlabs_api_key |
Settings → Packages → ElevenLabs |
elevenlabs_voice_id |
the voice to speak with |
elevenlabs_model |
optional; defaults to eleven_multilingual_v2 |
With nothing configured the tool returns isError naming the setting. That is
deliberate: an empty answer would reach Leo as a real result.
Running it
npm install
node index.js # speaks MCP over stdio
npm test # checks the response mapping, no network needed
Why plain JavaScript
This ships as a git tarball pinned to a commit SHA, and npm does not reliably run build steps for a tarball URL. A TypeScript source tree would install and then fail to start on somebody else's machine, where it is hardest to diagnose.
The registry entry must name a full 40-character commit SHA. A tag reads as equally specific and is not — it can be moved after the entry is reviewed.
License
MIT
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