> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pokulabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Messages Overview

> Send messages across SMS, WhatsApp, and Slack from any AI agent.

Poku supports two messaging modes:

* **One-way** — send a notification or update
* **Two-way** — send a message and wait for a reply, captured directly in the HTTP response or asynchronously via [webhook](/poku-skill/webhook)

***

## Channel comparison

|                      | SMS                                                                 | WhatsApp                                                    | Slack                                                                                                                                                                                                                                                                                                                                                                                                        |
| -------------------- | ------------------------------------------------------------------- | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Message format**   | Free-form text                                                      | Poku template (fixed) or your own Meta-approved template    | Free-form text                                                                                                                                                                                                                                                                                                                                                                                               |
| **From**             | Poku number or your own number via Twilio                           | Poku WhatsApp or your own WhatsApp number via Twilio / Bird | Poku workspace or your own                                                                                                                                                                                                                                                                                                                                                                                   |
| **Country coverage** | Limited — [see supported countries](/reference/supported-countries) | Global                                                      | Global                                                                                                                                                                                                                                                                                                                                                                                                       |
| **Additional setup** | Your own Twilio numbers must be approved for texting                | Your own WhatsApp number requires Meta template approval    | [Join Poku workspace](https://pokulabs.slack.com/join/shared_invite/zt-334pmqhy9-oZN8cMAXLFUdmDCgNZX9rA#/shared-invite/email) OR [install Pokubot into your own workspace](https://slack.com/oauth/v2/authorize?client_id=8696401389877.9342964367269\&scope=channels:history,channels:join,chat:write,chat:write.public,groups:history,im:history,im:write,mpim:write,users:read,mpim:history\&user_scope=) |