Let's talk about Slack best practices. Or should I say worst practices?

In particular about @channel and @here

For those who don't know: the @channel in Slack alerts everyone on the chat and @here alerts everyone on the chat who is online. Both commands are widely used, but both are, in fact, harmful.

The Problem

There is a team A-Team and a channel #a-team-channel. The audience of the channel is: 10 members from the A-Team itself, and 500 members of other teams who came to the channel to discuss the issue with the A-Team or just to browse what is going on there.

Now you come to the channel and want to get the attention of one of the A-Team members.

If you use @channel keyword you alert 510 people at once distracting them from what they are doing. If you use @here - you alert about 300 people, and maybe no one from the A-Team itself. And this is extremely counter-productive and leads to people disabling Slack notifications altogether.

What are the alternatives?

Slack supports two more alerting mechanisms: keywords and groups.

User Groups

Groups provide the more formal way of managing groups casts.

Pros: You can create a group and add people to it. Group members themselves don't need to do anything on their side.

Cons: Group management requires admin rights, it is not flexible, and can not be self-managed. If you change your current role from duty engineer to the research engineer for a week, you can not simply leave the 'on-duty' group and must contact Slack admin to do that for you.


With keywords you can configure per-user alerts and set the notification if someone mentioned a specific word in chat. For example I have an alert set whenever someone mentions the word 'jenkins'.

But keywords can also be used in a more organized way. If A-Team chooses its personal keyword, like a-team, and every team member subscribes to it, then this keyword can be used instead of 'channel' and 'here' casts. It is going to be more direct and straight to those people you actually need.

Pros: Fully flexible. Team members decide and manage which keywords they care about. Cons: Requires self-discipline. If you are the duty engineer, you must go and subscribe to "on-duty" keyword to get alerted.

Critical remark

Note that the crucial step here is to promote the keyword or user group to the people outside of the team. It needs to be discoverable the same way as e-mail address or Jira project. Add it to any landing page your team owns.

We also found it most effective to announce important keywords in the channel topic. Simply add line “To contact A-Team use keyword a-team to the #a-team-channel topic and after some time people will learn to use it.


The groups/keywords approach reduces fragmentation, as one don't need to create separate channels with smaller number of participants to limit the alerting power.

It increases the cross-team presence, as you can join more channels in a browsing mode, without increasing your alerts stream. You can watch and recap on what has happened in the A-Team channel during the day, even if you are not the direct responsible person and don't get alerted.

It improves the overall usage of Slack as alerts become more specific and go directly to the people you want to target.

Example 1: Support Channel

Suppose we have a Datacenter Engineers and Office IT Engineers teams. Each team has its own responsibilities but they also share a lot of common knowledge.

The Classical Way says we create a #dc-team and #it-team channels. The typical dialog then looks as follows:

The Support Struggle

Act 1. In #dc-team

  user: @here Server ABC is not responding, please check!!   # Alert includes ~50 server users
  dc-eng: logs?
  user: ..
  dc-eng: ask at #it-team

Act 2. In #it-team

  user: @here Can not reach server ABC, please check!!        # Alert includes ~100 office users
  user: dc-team send me here
  it-eng: logs?
  user: .. same logs again..
  it-eng: some more logs?
  user: ...
  it-eng: ask at #dc-team

Act 3. In #dc-team again

angry user: @here @channel PLEASE HELP!!!
angry user: it-team sends me back here, because they said..(and here follows the complete misinterpretation of what it-team has actually said)

Here user is bounced between channels and forced to repeat the entire context of the discussion. And I’ll leave up to you to calculate the amount of people alerted in these conversation.

Now the Keyword Way says we should have just one channel, which is the #support channel. DC Engineers respond to the dc-team keyword, and Office IT Engineers to it-team.

The above dialog would look as follows:

The better way

In #support

  user: dc-team, server ABC is not responding, please check!!   # Alert ~5 people
  dc-eng: logs?
  user: ..
  dc-eng: it-team, ^^                                         # Alert ~7 people
  it-eng: some more logs?
  user: ...
  it-eng: @dc-eng ^^                                           # Alert 1 person
  <here the it-eng and dc-eng engineers start to dig in together>

Here two teams can be cast into conversation independently but they share the context of the discussion. They also can talk to each other directly, which eliminates the misinterpretation problem.

Example 2: Development Channel

Suppose there is an ABC project with Dev, QA and Ops teams working on it.

The common pattern here is to create #abc-dev, #abc-qa and #abc-ops channels. Issues which come from such a division are well known and I won’t even bother you with the play to show it.

The better way

Create one #abc channel. And add abc-qa, abc-dev and abc-ops keywords, which would cover different aspects of the project. When project fails due to network issues in the datacenter, alert the abc-ops, when nightly tests start failing — use abc-qa, when there is a new feature planned — discuss it with abc-dev, but keep it all in the same channel.

Even when you haven’t gone full DevOps yet, you can add a lot of transparency by reorganizing your communication channels.


When using keywords and groups in Slack you do not need to align channels to team structure. The team structure is now covered by user groups or keywords, while channel can be aligned to the content. It gives you the flexibility, reduces fragmentation and increase overall cross-team collaboration based on projects and topics rather than formal structure.