MCP ServerSTDIOOfficialv3.1.1

better-call-claude MCP Server

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

io.github.sns45/better-call-claude

Hosted URL

https://github.com/sns45/better-call-claude

Transport

STDIO

Auth

6 required env vars

Connect to better-call-claude

Hosted endpoint — paste into any MCP client.

https://github.com/sns45/better-call-claude

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)

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

Open MCP Agent Studio and connect this server to Claude, GPT, Gemini, DeepSeek and more — no install required.

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