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

# Slack

> Install Henry in Slack, talk to it in channels and DMs, and control what it reads.

## Install Henry

A workspace admin connects Slack from **Channels**, from the dashboard, or from **Settings → Team settings → Chat platforms**. Click **Connect** and approve the Slack installation. The Slack app is called **Henry**.

<Note>
  You need permission to install apps in your Slack workspace. If your Slack admins restrict app installs, they may need to approve Henry first.
</Note>

## Talk to Henry

* **Mention `@Henry` in any channel** to ask a question or hand off a task. Henry replies in a thread under your message.
* **DM Henry** for private conversations. DMs are visible only to you.
* **Reply in a thread Henry is already in** without tagging it again. It follows the conversation.

<Warning>
  Slack only delivers mentions from channels Henry has been invited to. In a private channel, run `/invite @Henry` first. If you are not sure, type `/henry status` in the channel. If Henry is not there, it tells you exactly that.
</Warning>

## Slash commands

Type `/henry` followed by a command:

| Command                      | What it does                                                                       |
| ---------------------------- | ---------------------------------------------------------------------------------- |
| `/henry status`              | Checks that Henry is connected and whether it is in this channel.                  |
| `/henry capture on` or `off` | Turns passive reading of this channel on or off. See below.                        |
| `/henry capture purge`       | Deletes everything Henry learned from this channel and stops reading it.           |
| `/henry ambient on` or `off` | Lets Henry chime in on relevant untagged messages in this channel. Off by default. |
| `/henry help`                | Lists these commands.                                                              |

Slash commands are available to members of the Slack workspace Henry is installed in. Slack Connect guests from other workspaces cannot change capture or ambient settings.

## Channel capture

When Henry is in a channel, it reads the discussion so it can answer questions about team context later, such as "what did we decide about the launch date?". This is **capture**.

* Turn it off for a channel with `/henry capture off`. What Henry already learned stays.
* Turn it back on with `/henry capture on`.
* Remove everything Henry learned from a channel with `/henry capture purge`.

Secrets that appear in channel text, such as API keys and tokens, are redacted before anything is stored.

## Ambient mode

Normally Henry only speaks when mentioned. **Ambient mode** lets Henry reply, in a thread, when an untagged message in a channel is clearly something it can help with. It is off by default and strictly per channel. Turn it on with `/henry ambient on`.

## Approvals in Slack

When Henry needs your go-ahead, it posts a card below its message with **Confirm** and **Cancel**. Several actions of the same kind combine into one card with **Confirm all**. Cards also offer **Confirm + always allow this tool** and **Confirm + always allow this integration** so you can stop being asked for things you trust. After you confirm, the card updates to show who approved it and Henry continues the work.

Read the full model in [Approvals](/user-guide/working-with-henry/approvals).

## Fast replies

Add `!fast` anywhere in a message to get a quicker, cheaper reply for that one message. Admins pick which model handles fast replies in **Settings → Models**.

## Files in Slack

* **Images** you attach are read by Henry. Up to 10 files per message, 4 MB per image.
* **Voice memos** are transcribed and treated as your message.
* Other file types are acknowledged by name, but Henry cannot read them in Slack today. Use a [Project](/user-guide/projects/overview) for documents.

## Disconnect or reconnect

In **Settings → Team settings → Chat platforms**, open the menu on the Slack tile and choose **Reconnect** (refreshes the connection if something seems off) or **Disconnect**. Disconnecting stops Henry from responding in that Slack workspace and pauses scheduled tasks that deliver there.