Slack – Limit slackbot response to a channel

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From: Leaving, archiving, or deleting a channel

Deleting a channel

Because channel deletion is a destructive activity, only Team Owners and Admins can delete channels. If a channel is deleted, all of its content will be removed from your team's Slack archives permanently. We are unable to restore deleted channels.

To delete a channel:

1. Go to your team's channel list at https://my.slack.com/archives
2. On the Channels tab, click the channel name.
3. Click the red Delete channel link.
4. Check Yes, I am absolutely sure and click Delete it.

Note: The #general channel cannot be deleted.

There's an undocumented API endpoint for this: emoji.add (and its little buddy emoji.remove).

emoji.add POST parameters

• token (either in POST body or Authorization: Bearer header) (There's an open GitHub issue that claims you can't use xoxb tokens, only xoxs ones.)
• mode (data)
• name (what you want as the custom emoji's name, e.g. my-party-parrot)
• image (the file)

emoji.remove POST parameters

• token (either in POST body or Authorization: Bearer header)
• name (which custom emoji you want to remove, e.g. my-party-parrot)

Here's what it looks like in Postman:

In CURL, the call would look like this:

curl -X POST \
  https://slack.com/api/emoji.add \
  -H 'Authorization: Bearer [REDACTED] \
  -H 'content-type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW' \
  -H 'user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36' \
  -F mode=data \
  -F name=my-party-parrot \
  -F image=@/home/curtis/Downloads/some-file.jpg

Everything that I know about this comes from from Jack Ellenberger's ":slack_on_fire:" article and his emojme library.