Name: Whatsapp
Availability: InStock
Author: project-nomos

SKILL verified MIT Self-run

skill-project-nomos-nomos-whatsapp · by project-nomos

Send WhatsApp messages programmatically via the Baileys library (WhatsApp Web multi-device protocol). Use when the user asks to send a WhatsApp message or interact with WhatsApp.

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Install

$ agentstack add skill-project-nomos-nomos-whatsapp

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

✓ Prompt-injection patterns
✓ Secret / credential exfiltration
✓ Dangerous shell & filesystem operations
✓ Untrusted network calls
✓ Known-malicious package signatures

What it can access

✓ Network access No
✓ Filesystem access No
✓ Shell / process execution No
● Environment & secrets Used
✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

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Reliability & compatibility

✓ Security review passed

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● 2mo ago

Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

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:

Run npx tsx src/integrations/whatsapp.ts
Scan the QR code with WhatsApp on your phone (Linked Devices)
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:

Mentioned by name — Someone sends a message mentioning the bot's phone number
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

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Author: project-nomos
Source: project-nomos/nomos
License: MIT
Homepage: https://projectnomos.dev

Install and usage instructions live in the source repository linked above.

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Versions

v0.1.0 Imported from the upstream source.