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I can not see in the slack API documentation the way for a bot to send a message in a channel that response to a user.

The same way slackbot does reply when doing /help.

Anyone can let me know if that is possible?

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Notice the "Only visible to you". In the RTM manual they say that the messsage is of the same type as the event message. I don't see any attributes that would say it is visible only to a certain user.

mathk
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1 Answers1

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Sending private messages in channels with the "Only visible to you" tag is called "ephemeral" and is now possible through the Slack API.

https://api.slack.com/methods/chat.postEphemeral

(I'm not sure since when)

Pangolin
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    Please note: Ephemeral message delivery is not guaranteed — the user must be currently active in Slack and a member of the specified channel. By nature, ephemeral messages do not persist across reloads, desktop and mobile apps, or sessions. – Edgar Ortega Dec 26 '19 at 14:24