WhatsApp

Send and receive WhatsApp messages using the Baileys library, which implements the WhatsApp Web multi-device protocol.

Authentication

The WhatsApp integration uses QR code authentication:

1. Run npx tsx src/integrations/whatsapp.ts
2. Scan the QR code with WhatsApp on your phone (Linked Devices)
3. Auth credentials are saved to ~/.nomos/whatsapp-auth/ for reconnection

Running the Bot

Start the WhatsApp bot:

npx tsx src/integrations/whatsapp.ts

The bot will:

• Display a QR code on first run (scan with your phone)
• Automatically reconnect using saved credentials
• Listen for incoming messages in individual chats and groups
• Respond to mentions in groups or messages starting with /, !, or @
• Track conversation context for multi-turn dialogue

Message Patterns

Individual Chats

The bot responds to all messages in individual (1-on-1) chats.

Group Chats

The bot only responds when:

1. Mentioned by name — Someone sends a message mentioning the bot's phone number
2. Trigger prefix — Message starts with /, !, or @

Example group messages that trigger a response:

@15551234567 what's the weather?
/help
!status
@bot hello there

Restricting Access

To limit the bot to specific chats, set the WHATSAPP_ALLOWED_CHATS environment variable with comma-separated JIDs (WhatsApp IDs):

# .env
WHATSAPP_ALLOWED_CHATS=15551234567@s.whatsapp.net,120363123456789012@g.us

JID formats:

• Individual chats: [phone_number]@s.whatsapp.net (e.g., 15551234567@s.whatsapp.net)
• Group chats: [group_id]@g.us (e.g., 120363123456789012@g.us)

Features

• QR Code Login — Scan with your phone to authenticate
• Session Persistence — Auth credentials saved for automatic reconnection
• Multi-turn Context — Maintains conversation history per chat
• Group Support — Responds to mentions and trigger prefixes in groups
• Message Chunking — Automatically splits long responses (4096 char limit)
• Typing Indicators — Shows "composing..." while processing
• Allowlist Support — Restrict bot to specific chats via env var

Tips

• To find a chat JID, check the bot logs when a message is received
• Group JIDs contain @g.us, individual chats contain @s.whatsapp.net
• In groups, prefix messages with /, !, or @ to trigger the bot without mentioning
• The bot ignores its own messages and status broadcasts
• Long messages are automatically split into multiple messages
• Auth state is stored in ~/.nomos/whatsapp-auth/ — back up this directory to preserve sessions