better-call-claude MCP Server

What the better-call-claude MCP server does

How models use it and what it is built for.

Voice Calls, SMS, and WhatsApp for Claude Code with cross-channel context sharing.

Connect to better-call-claude

Hosted endpoint — paste into any MCP client.

Environment variables

Configuration this server reads at startup.

• BETTERCALLCLAUDE_PHONE_PROVIDERRequired

  Phone provider: 'twilio' or 'telnyx'

• BETTERCALLCLAUDE_PHONE_NUMBERRequired

  Your phone number in E.164 format

• BETTERCALLCLAUDE_PHONE_ACCOUNT_SIDRequiredSecret

  Twilio Account SID or Telnyx API Key

• BETTERCALLCLAUDE_PHONE_AUTH_TOKENRequiredSecret

  Twilio Auth Token or Telnyx API Secret

• BETTERCALLCLAUDE_USER_PHONE_NUMBERRequired

  Your personal phone number in E.164 format (for outbound calls/SMS)

• BETTERCALLCLAUDE_OPENAI_API_KEYRequiredSecret

  OpenAI API key for speech-to-text (Whisper) and text-to-speech

• BETTERCALLCLAUDE_WHATSAPP_NUMBER

  WhatsApp number if different from phone number (e.g., Twilio Sandbox)

• BETTERCALLCLAUDE_PORT

  Local HTTP server port

• TAILSCALE_HOSTNAME

  Override Tailscale hostname for webhook URL

• BETTERCALLCLAUDE_WHATSAPP_PROVIDER

  WhatsApp provider: set to 'baileys' for free WhatsApp via WebSocket (no Twilio needed)

• BETTERCALLCLAUDE_BAILEYS_AUTH_DIR

  Path to Baileys auth state directory (default: data/baileys-auth)

• BETTERCALLCLAUDE_WHATSAPP_CHAT_HISTORY_SIZE

  Max WhatsApp chat history messages to retain (default: 50)

Resources

Where to find authoritative docs and source for better-call-claude.

• Source repository