Spix MCP Server

Give AI agents the ability to make phone calls and send emails — as MCP tool calls.

Spix is communications infrastructure for AI agents. This MCP server exposes Spix's API as tools that any MCP-compatible client (Claude Desktop, Cursor, Windsurf, etc.) can use.

What your agent gets

20+ tools total. Run spix-mcp to see the full list.

Quick start

1. Get a Spix API key

Sign up at app.spix.sh or via the CLI:

curl -fsSL https://github.com/Spix-HQ/spix-cli/releases/latest/download/spix-darwin-arm64 -o spix
chmod +x spix && sudo mv spix /usr/local/bin/
spix signup
spix auth key create --name mcp

2. Install

pip install spix-mcp

Or run directly with uvx (no install):

uvx spix-mcp

3. Configure Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "spix": {
      "command": "uvx",
      "args": ["spix-mcp"],
      "env": {
        "SPIX_API_KEY": "your-api-key"
      }
    }
  }
}

Restart Claude Desktop. Spix tools will appear in the tools panel.

Cursor / Windsurf

{
  "mcpServers": {
    "spix": {
      "command": "uvx",
      "args": ["spix-mcp"],
      "env": {
        "SPIX_API_KEY": "your-api-key"
      }
    }
  }
}

Configuration

All configuration is via environment variables:

Tool profiles

Safe profile (default): Read operations + create calls/emails. Cannot delete resources or modify billing.

Full profile: All operations including delete, billing management, and admin tools.

{
  "env": {
    "SPIX_API_KEY": "your-key",
    "SPIX_TOOL_PROFILE": "full"
  }
}

Session scoping

Restrict what your agent can access:

{
  "env": {
    "SPIX_API_KEY": "your-key",
    "SPIX_DEFAULT_PLAYBOOK": "your-playbook-id",
    "SPIX_SESSION_NAME": "sales-bot"
  }
}

How it works

Your Agent (Claude, etc.)
    ↓ MCP tool call
Spix MCP Server (this package)
    ↓ HTTP API call
Spix Backend (api.spix.sh)
    ↓ Carrier APIs
Phone call / Email / SMS

The MCP server is a thin bridge between MCP protocol and the Spix REST API. All business logic runs server-side. The MCP server handles:

• Tool schema generation from the API spec
• Session scoping and access control
• Request/response formatting for MCP protocol

Voice calls

When your agent calls spix_call_create, Spix:

1. Dials the number via Telnyx/Twilio
2. Uses Deepgram Nova-3 for real-time speech recognition
3. Uses Claude for conversation turn generation
4. Uses Cartesia Sonic-3 for text-to-speech
5. Records the call and generates a transcript + summary

Your agent can then read the transcript and summary via spix_call_transcript and spix_call_summary.

Links

• Spix Website
• Dashboard
• CLI
• API Docs

License

MIT