vapi-mcp-server

A Model Context Protocol (MCP) server for Vapi — bring your voice-AI agents into Claude, Cursor, or any MCP client. Manage assistants, read call transcripts and analyses, and place outbound calls in natural language.

Built by JS Leboeuf / AutoScale AI — a francophone-Québec voice-agent platform. Not affiliated with Vapi.

Why

Vapi is a powerful voice-AI platform, but day-to-day operations (which assistant said what, why a call ended, what an outbound campaign cost) mean clicking through a dashboard or curl-ing the REST API. This server lets an LLM agent do it conversationally:

"List my assistants, pull the last 10 calls for the receptionist, and summarize why callers hung up."

Tools

Tool	What it does
vapi_list_assistants	List assistants (id, name, model, voice)
vapi_get_assistant	Full config of one assistant (prompt, tools, transcriber)
vapi_list_calls	Recent calls; optionally filtered by assistant
vapi_get_call	One call in full: transcript, analysis, recording URL, cost
vapi_list_phone_numbers	Provisioned phone numbers
vapi_create_call	Place an outbound call (assistant → customer number)

Quickstart

You need a Vapi private API key — create one at dashboard.vapi.ai → Settings → API Keys.

Claude Desktop / Claude Code

Add to your MCP config (claude_desktop_config.json, or .mcp.json for Claude Code):

{
  "mcpServers": {
    "vapi": {
      "command": "npx",
      "args": ["-y", "vapi-mcp-server"],
      "env": { "VAPI_API_KEY": "your-vapi-private-key" }
    }
  }
}

Cursor

Settings → MCP → Add new server, same command / args / env as above.

That's it — restart the client and the six vapi_* tools appear.

Configuration

Env var	Required	Default	Notes
VAPI_API_KEY	✅	—	Your Vapi private key
VAPI_BASE_URL	—	https://api.vapi.ai	Override for self-hosted / proxy

Build from source

git clone https://github.com/JSLeboeuf/vapi-mcp-server.git
cd vapi-mcp-server
npm install
npm run build
VAPI_API_KEY=sk-... node dist/index.js   # runs on stdio

Security

• The server only reads/acts on your own Vapi account via your key.
• Keys are read from the environment and never logged.
• vapi_create_call places real, billable phone calls — it asks the model to confirm the destination number, but you should still review tool calls in your MCP client.

Roadmap

• vapi_update_assistant (prompt/voice/model edits)
• Call analytics aggregation (cost, duration, end-reason breakdowns)
• Squad / workflow tools

PRs welcome.

License

MIT © 2026 JS Leboeuf (AutoScale AI)