CastleCall

An MCP server that exposes a text-to-speech announce tool for CastleCall — a home PA/announcement system for Raspberry Pi.

Supports Piper (local) and ElevenLabs (cloud) TTS providers via stdio transport.

Setup

npm install
npm run build

Configuration

Variable	Required	Description
CASTLECALL_URL	Yes	URL of your CastleCall instance (e.g. http://192.168.1.50:3000)
CASTLECALL_PROVIDER	No	TTS provider: piper (default) or elevenlabs
CASTLECALL_VOICE_ID	When using ElevenLabs	ElevenLabs voice ID

Usage

Claude Desktop / Claude Code

Add to your MCP settings:

{
  "mcpServers": {
    "castlecall": {
      "command": "node",
      "args": ["/path/to/castlecall-mcp/dist/cli.js"],
      "env": {
        "CASTLECALL_URL": "http://192.168.1.50:3000",
        "CASTLECALL_PROVIDER": "piper"
      }
    }
  }
}

ElevenLabs example:

{
  "mcpServers": {
    "castlecall": {
      "command": "node",
      "args": ["/path/to/castlecall-mcp/dist/cli.js"],
      "env": {
        "CASTLECALL_URL": "http://192.168.1.50:3000",
        "CASTLECALL_PROVIDER": "elevenlabs",
        "CASTLECALL_VOICE_ID": "your-voice-id"
      }
    }
  }
}

Tool

announce

Play a text-to-speech announcement on CastleCall.

Parameter	Type	Required	Description
text	string	Yes	The text to announce