remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Integrations

Allows the MCP server to be installed and run via NPX, making it easy to integrate Vapi's capabilities through the NPM package ecosystem.

Vapi MCP Server

The Vapi Model Context Protocol server allows you to integrate with Vapi APIs through function calling.

Claude Desktop Setup

Open Claude Desktop and press CMD + , to go to Settings.
Click on the Developer tab.
Click on the Edit Config button.
This will open the claude_desktop_config.json file in your file explorer.
Get your Vapi API key from the Vapi dashboard (https://dashboard.vapi.ai/org/api-keys).
Add the following to your claude_desktop_config.json file. See here for more details.
Restart the Claude Desktop after editing the config file.

{
  "mcpServers": {
    "vapi-mcp-server": {
      "command": "npx",
      "args": [
          "-y",
          "@vapi-ai/mcp-server"
      ],
      "env": {
        "VAPI_TOKEN": "<your_vapi_token>"
      }
    }
  }
}

Example Usage with Claude Desktop

Create or import a phone number using the Vapi dashboard (https://dashboard.vapi.ai/phone-numbers).
Create a new assistant using the existing 'Appointment Scheduler' template in the Vapi dashboard (https://dashboard.vapi.ai/assistants).
Make sure to configure Claude Desktop to use the Vapi MCP server and restart the Claude Desktop app.
Ask Claude with the following message:

I wanna schedule an appointment, can you connect me with Riley assistant using my phone number +1234567890?

Remote SSE Connection

To connect to Vapi's MCP server via Server-Sent Events (SSE) Transport:

Connect to https://mcp.vapi.ai/sse from any MCP client using SSE Transport
Include your Vapi API key as a bearer token in the request headers
Example header: Authorization: Bearer your_vapi_api_key_here

This connection allows you to access Vapi's functionality remotely without running a local server.

Development

# Install dependencies
npm install

# Build the server
npm run build

Update your claude_desktop_config.json to use the local server.

{
  "mcpServers": {
    "vapi-local": {
      "command": "node",
      "args": [
        "<path_to_vapi_mcp_server>/dist/index.js"
      ],
      "env": {
        "VAPI_TOKEN": "<your_vapi_token>"
      }
    },
  }
}

Testing

The project has two types of tests:

Unit Tests

Unit tests use mocks to test the MCP server without making actual API calls to Vapi.

# Run unit tests
npm run test:unit

End-to-End Tests

E2E tests run the full MCP server with actual API calls to Vapi.

# Set your Vapi API token
export VAPI_TOKEN=your_token_here

# Run E2E tests
npm run test:e2e

Note: E2E tests require a valid Vapi API token to be set in the environment.

Running All Tests

To run all tests at once:

npm test

References

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Enables integration with Vapi APIs through function calling via the Model Context Protocol, allowing AI models to access Vapi's capabilities.

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