docs: add Slack integration page (cube-js#10676)

Cover notifications delivery and Slack Agent features,
including setup, user matching, and current limitations.

Made-with: Cursor

Author: keydunov

docs-mintlify/docs.json

@@ -141,6 +141,7 @@
           {
             "group": "Integrations",
             "pages": [
+              "docs/integrations/slack",
               "docs/integrations/tableau",
               {
                 "group": "Power BI",

docs-mintlify/docs/integrations/slack.mdx

@@ -0,0 +1,88 @@
+---
+title: Slack
+description: Connect Cube to Slack for notifications and AI-powered analytics chat.
+---
+
+<Info>
+
+Available on [Premium and above plans](https://cube.dev/pricing).
+
+</Info>
+
+Cube's Slack integration enables two capabilities:
+
+- **[Notifications](#notifications)** — Deliver scheduled dashboard screenshots
+  to Slack channels.
+- **[Slack Agent](#slack-agent)** — Let your team ask data questions directly in
+  Slack and get AI-powered answers from the
+  [Analytics Chat][ref-analytics-chat] agent.
+
+## Setup
+
+A workspace admin connects Slack from the **Settings → Integrations → Slack**
+page. The setup flow authorizes Cube to interact with your Slack workspace via
+OAuth.
+
+Once connected, the admin selects:
+
+- A **deployment** that the Slack integration will use.
+- An **agent** that will respond to questions in Slack.
+
+<Frame>
+  <img src="https://lgo0ecceic.ucarecd.net/adde089b-454b-4c7d-ad1b-0fbb930963ea/" />
+</Frame>
+
+## Notifications
+
+Slack notifications post a dashboard screenshot to a Slack channel after each
+[scheduled refresh][ref-scheduled-refreshes]. See [Notifications][ref-notifications]
+for details on creating and configuring notification schedules.
+
+## Slack Agent
+
+The Slack Agent brings [Analytics Chat][ref-analytics-chat] into Slack.
+Anyone in your Slack workspace can send a direct message to the Cube app and
+get AI-powered answers grounded in your semantic layer — without leaving Slack.
+
+### How it works
+
+1. A user sends a direct message to the Cube Slack app.
+2. Cube matches the user by **email address** — the email in Slack must match
+   an existing Cube user.
+3. An [Analytics Chat][ref-analytics-chat] session is created, and the agent
+   responds in a **Slack thread**.
+
+<Frame>
+  <img src="https://lgo0ecceic.ucarecd.net/bf19e3bf-98fd-4f6d-9db5-964696280cf3/" />
+</Frame>
+
+Follow-up questions can be asked by replying in the same Slack thread, keeping
+the conversation contextual.
+
+### User matching
+
+Cube identifies Slack users by their email address. For the integration to work,
+a user with the **same email** must exist in both Cube and the connected Slack
+workspace. If no matching Cube user is found, the agent will not respond.
+
+### Limitations
+
+<Warning>
+
+Slack Agent is in active development. The following limitations apply:
+
+- **DMs only** — The Slack Agent currently works only in direct messages with
+  the Cube app. Channel mentions are not supported.
+- **One agent** — Only one agent can be active at a time. Admins can change the
+  selected agent in the Slack integration settings.
+- **One-way message sync** — Chats initiated from Slack are visible in the Cube
+  UI, and you can post messages from the Cube UI, but those messages will not
+  appear in the corresponding Slack thread.
+- **Email matching required** — Users must have the same email address in both
+  Cube and Slack.
+
+</Warning>
+
+[ref-analytics-chat]: /docs/explore-analyze/analytics-chat
+[ref-notifications]: /docs/explore-analyze/notifications
+[ref-scheduled-refreshes]: /analytics/scheduled-refreshes