Messaging

Messaging

Send messages through connected channels using the msg CLI.

CLI

# Send a DM
msg send --channel whatsapp --to "+1234567890" "Hello!"

# Send to a group (use the group JID)
msg send --channel whatsapp --to "120363001234@g.us" "Daily summary ready."

# Reply to a specific message
msg send --channel whatsapp --to "+1234567890" --reply-to "MSG_ID" "Got it!"

# Send an image with caption
msg send --channel whatsapp --to "+1234567890" --image /path/to/photo.jpg "Check this out"

# Send a document
msg send --channel whatsapp --to "+1234567890" --file /path/to/report.pdf

# Send a voice note
msg send --channel whatsapp --to "+1234567890" --audio /path/to/voice.ogg --ptt

# Send a video with caption
msg send --channel whatsapp --to "+1234567890" --video /path/to/clip.mp4 "Watch this"

# Send a sticker
msg send --channel whatsapp --to "+1234567890" --sticker /path/to/sticker.webp

# List connected channels and their status
msg channels

# List allowlisted WhatsApp groups
msg groups

Media Flags

| Flag | Description | |------|-------------| | --image | Send an image (JPEG, PNG, WebP, GIF) | | --file | Send a document (PDF, DOCX, etc.) | | --audio | Send audio (OGG, MP3, M4A) | | --video | Send video (MP4, MOV) | | --sticker | Send a sticker (WebP) | | --ptt | Mark audio as voice note (push-to-talk) |

When using --image, --file, or --video, the text argument becomes the caption.

`` Directive

When receiving a group message that does not require a response, output `` instead of text. The bridge suppresses sending when this directive is present.

Use `` when:

• Message is casual chatter or FYI with no actionable content
• Conversation does not involve you and your input adds no value
• Someone else already answered adequately

Do NOT use `` when:

• You are @mentioned — always respond to direct mentions
• You have genuinely useful information to contribute
• Someone asked a question you can answer

Group Etiquette

• Keep replies concise and relevant
• Do not send multiple messages in quick succession to the same group
• Wait for a natural pause before contributing to ongoing threads
• Never send sensitive information (passwords, keys, personal data) to groups

Channels

| Channel | --channel | --to format | |----------|-------------|---------------| | WhatsApp | whatsapp | +{number} (DM) or {jid}@g.us (group) |

Source & license

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

• Author: Array-Ventures
• Source: Array-Ventures/coworker
• License: Apache-2.0
• Homepage: https://railway.com/deploy/coworker

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