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.ai 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.ai/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:

PORT=3000 npx agentphone-mcp --http

Then connect to http://localhost:3000/mcp and configure your MCP client to send Authorization: Bearer <your AgentPhone API key> with each request. A server-side AGENTPHONE_API_KEY alone does not authorize HTTP callers.

Warning: AGENTPHONE_ALLOW_ANONYMOUS=true opts into using the server's AGENTPHONE_API_KEY for requests with no Authorization header, only when OAuth is off. Anyone who can reach that endpoint can act as the account: only enable this behind your own authentication. Malformed headers are rejected, and a caller's supplied bearer is never replaced by the server key.

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"

Transport & hosting

The server is built on the mcp-use server framework, which owns the HTTP layer: Streamable HTTP, the SSE stream, session management, and the OAuth discovery endpoints. npm start (or the Docker image) runs it as an HTTP server on PORT (default 3000), reachable at /mcp.

• Hosted: https://mcp.agentphone.ai/mcp
• Self-hosted: PORT=3000 npm start → http://localhost:3000/mcp

Authentication

1. OAuth (recommended for end users): the framework proxies an

Authorization Code + PKCE flow to the AgentPhone authorization server, so the client opens a browser to sign in at agentphone.ai — no key to paste. Enable it by setting MCP_OAUTH_CLIENT_ID (a client pre-registered with the AgentPhone AS). MCP_OAUTH_CLIENT_SECRET is optional: set it to run the gateway as a confidential client, or leave it unset to run as a public client (the gateway must then be registered with token_endpoint_auth_method=none). Public mode advertises none to downstream clients, which strict OAuth clients require.

1. API key (scripts / single-tenant, OAuth off): each request sends

Authorization: Bearer <your API key>. The server-side AGENTPHONE_API_KEY is only used for callers that send nothing, and only when AGENTPHONE_ALLOW_ANONYMOUS=true. Without that flag an unauthenticated call is rejected, so an exposed port cannot act as your account.

With OAuth enabled, bearer tokens are verified through the backend’s /auth/me; the anonymous opt-in does not bypass that verification.

The caller’s credential is forwarded to the AgentPhone REST API for validation. The optional anonymous mode instead uses the configured server API key.

Environment

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 number usage, message/call/webhook volume, and daily/monthly breakdowns

All Tools (28)

Account

Phone Numbers

SMS

Contacts

Voice Calls

Agents

Webhooks

All webhook tools accept an optional agent_id — pass it to manage an agent-specific webhook, omit it for the project-level default. Agent webhooks take priority over project-level.

get_webhook and set_webhook mask signing secrets by default, for both scopes. Retrieve the secret from the dashboard when possible. Passing reveal_secret: true includes it in tool output, exposing it to model context, transcripts and client logs. This prevents accidental disclosure; it is not an authorization boundary against a model that deliberately requests the secret.

Environment Variables

Development

git clone https://github.com/AgentPhone-AI/agentphone-mcp.git
cd agentphone-mcp
npm install
npm run dev     # Run with tsx (hot reload)
npm run build   # Compile TypeScript
npm start       # Run compiled JS (stdio)

How It Works

This MCP server connects your AI assistant to the AgentPhone API. Your assistant talks to the MCP server, which calls the AgentPhone API, which talks to the phone network.

Your AI Assistant  <-->  agentphone-mcp  <-->  AgentPhone API  <-->  Phone Network

Outbound: your assistant places calls and sends texts through AgentPhone's API.

Inbound: when someone calls or texts your number, AgentPhone sends a webhook event to your server — you can then respond programmatically or let your agent's built-in AI handle it.

License

MIT