AgentPhone MCP Server

Give AI agents real phone numbers, SMS, and voice calls via the Model Context Protocol.

AgentPhone lets your AI agent buy phone numbers, send/receive SMS, and place voice calls — all through natural language in Cursor, Claude Desktop, or any MCP-compatible client.

Agents are the core concept — each agent gets its own phone numbers, voice personality, system prompt, and webhook. Think of an agent as a virtual team member with its own phone line. You can create agents for different purposes (support, sales, scheduling) and configure how they sound and behave on calls.

Quick Start

1. Get your API key

Sign up at agentphone.to and create an API key from Settings.

2. Connect via MCP

Option A: Remote server (recommended)

Point your MCP client at the hosted endpoint — no install needed:

{
  "mcpServers": {
    "agentphone": {
      "type": "streamable-http",
      "url": "https://mcp.agentphone.to/mcp",
      "headers": {
        "Authorization": "Bearer your_api_key_here"
      }
    }
  }
}

Works with any MCP client that supports Streamable HTTP transport (Switchboard, remote agent platforms, etc.).

Option B: Local server (stdio)

Runs locally via npx — works with Cursor, Claude Desktop, Windsurf, and Claude Code:

Cursor: Settings > MCP or ~/.cursor/mcp.json Claude Desktop: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

{
  "mcpServers": {
    "agentphone": {
      "command": "npx",
      "args": ["-y", "agentphone-mcp"],
      "env": {
        "AGENTPHONE_API_KEY": "your_api_key_here"
      }
    }
  }
}

Option C: Self-hosted HTTP server

Run your own HTTP MCP endpoint:

AGENTPHONE_API_KEY=your_api_key npx agentphone-mcp --http --port 3000

Then connect to http://localhost:3000/mcp.

What Can It Do?

Once configured, just ask your AI agent things like:

• "Buy me a phone number in the 415 area code"
• "Create a support agent that greets callers and helps with billing"
• "Call +14155551234 and have a conversation about scheduling a dentist appointment"
• "Text +14155551234 saying 'Your appointment is confirmed for 3pm tomorrow'"
• "Show me my recent calls and transcripts"
• "List the available voices and switch my agent to a different one"
• "Set up a webhook so I get notified when someone calls or texts my number"
• "Show me this month's usage breakdown"

Transports

Authentication

• stdio: API key via AGENTPHONE_API_KEY environment variable
• HTTP (self-hosted): API key via env var or Authorization: Bearer <key> header per request
• HTTP (hosted): API key via Authorization: Bearer <key> header per request

Endpoints (HTTP mode)

Highlights

• Phone numbers — buy and manage numbers in any US/CA area code
• SMS — send and receive text messages, view conversation threads
• Voice calls — place outbound calls with built-in AI conversation (no webhook needed) or bring your own webhook
• Inbound handling — set up webhooks to receive and respond to inbound calls and texts in real time
• Agents — create agents with custom voices, system prompts, call transfer, and voicemail
• Usage & billing — monitor your plan limits, mess

... View full README on GitHub