TwelveLabs MCP Server

This project is not affiliated with TwelveLabs (the video understanding platform). It is an MCP server for the ElevenLabs Conversational AI API — voice agents, knowledge bases, conversations, and TTS. The name "TwelveLabs" is the project codename only.

An enhanced MCP (Model Context Protocol) server that gives any compatible MCP client direct access to the ElevenLabs Conversational AI API -- including capabilities the official ElevenLabs MCP connector doesn't expose.

What this covers

• Agents -- list, get full config (including LLM model + temperature), update prompt/settings, manage webhooks and file uploads
• Knowledge Base -- list, read full content, add text/URL docs, delete docs
• Conversations -- filter and tag history, inspect transcripts, and rerun post-call analysis/evaluations
• Voices -- list and search available voices

Prerequisites

• Node.js >= 18
• ElevenLabs API key -- get one at elevenlabs.io

Quick Start

Option A: npx (no clone needed)

ELEVENLABS_API_KEY=your-key npx twelvelabs-mcp-server

Option B: Clone and build

git clone https://github.com/micro-JAY/twelvelabs-mcp-server.git
cd twelvelabs-mcp-server
npm install --include=dev
npm run build

Connect an MCP client

Add an equivalent server entry to your MCP client's configuration. The config file location and surrounding syntax vary by client; this is the standard stdio server definition:

{
  "mcpServers": {
    "twelvelabs": {
      "command": "node",
      "args": ["/path/to/twelvelabs-mcp-server/dist/index.js"],
      "env": {
        "ELEVENLABS_API_KEY": "your-api-key-here"
      }
    }
  }
}

Restart or reconnect your MCP client. You should see twelvelabs in its available tools list.

Use it

Ask your MCP-enabled assistant to use the tools, for example:

"List my agents" "Get the full config for agent_1001kjbh14xce5kbreh55ydf4rae" "Show me the last 10 conversations for that agent" "Get the transcript and analysis for conversation_xyz"

Compatibility

This server works with MCP clients that support the stdio transport and let you configure environment variables for a local server process. Clients that only support remote HTTP MCP servers need a compatible stdio bridge or proxy.

Tool Reference

Agent Tools

Tool	What it does
twelvelabs_list_agents	List all agents in your account
twelvelabs_get_agent	Full config: LLM model, voice, KB docs, webhook, prompt preview
twelvelabs_get_agent_prompt	Full untruncated system prompt text
twelvelabs_update_agent_prompt	Replace system prompt and/or first message
twelvelabs_update_agent_settings	Change temperature, voice, TTS settings, language
twelvelabs_update_agent_conversation_capabilities	Enable chat file uploads and set the maximum-duration message
twelvelabs_list_agent_conversations	Recent conversations for one agent
twelvelabs_get_agent_webhook	Current webhook URL
twelvelabs_set_agent_webhook	Set or remove webhook URL

Knowledge Base Tools

Tool	What it does
twelvelabs_list_kb_docs	All KB docs with size and creation date
twelvelabs_get_kb_doc	Full extracted text content of a doc
twelvelabs_add_kb_text	Add a plain text document
twelvelabs_add_kb_url	Add a web page by URL
twelvelabs_delete_kb_doc	Permanently delete a doc

Conversation Tools

Tool	What it does
twelvelabs_list_conversations	Filter history by agent, time, success, duration, rating, status, and tags
twelvelabs_get_conversation	Full transcript, audio/tag metadata, data collection, and evaluation results
twelvelabs_rerun_conversation_analysis	Reanalyse a completed conversation using current agent settings
twelvelabs_rerun_conversation_evaluation	Rerun a single evaluation criterion for a completed conversation
twelvelabs_list_conversation_tags	List workspace conversation tags
twelvelabs_create_conversation_tag	Create a workspace conversation tag
twelvelabs_update_conversation_tag	Rename a tag or change its description
twelvelabs_assign_conversation_tags	Apply one or more tags to a conversation
twelvelabs_remove_conversation_tag	Remove a tag from a conversation
twelvelabs_delete_conversation_tag	Permanently delete a workspace conversation tag

Voice Tools

Tool	What it does
twelvelabs_list_voices	Browse available voices with IDs and labels

Security

• Input validation -- all tool parameters are validated with Zod schemas before reaching the API
• HTTPS enforcement -- webhook URLs are validated to use HTTPS only
• Path traversal protection -- document and agent IDs are sanitized to prevent path traversal
• Error sanitization -- internal errors are caught and returned as safe MCP error responses; raw stack traces are never exposed to the client

Development

npm run dev   # watch mode with tsx -- auto-reloads on file changes
npm run build # compile to dist/

Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feat/my-feature)
3. Commit your changes (git commit -m 'feat: add my feature')
4. Push to the branch (git push origin feat/my-feature)
5. Open a Pull Request

License

MIT -- see LICENSE for details.

Architecture Note

All tools share a single Axios client instance (src/client.ts) initialised from ELEVENLABS_API_KEY at startup. Tool implementations live in src/tools/ -- one file per domain -- and are registered onto the McpServer in src/index.ts. The server communicates over stdio transport (stdin/stdout), which is why all debug logging uses console.error (stderr), not console.log.