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brand Slack
tagline Where work happens. Channel-based messaging for teams and organizations.
category Messaging
website https://slack.com

Slack — Information Architecture

Overview

Slack is a channel-based workplace messaging platform built around the workspace → channel → message hierarchy. The mental model is organized conversations — instead of a single chat list, communication is structured into public/private channels by topic, team, or project, with direct messages for person-to-person communication. Slack differentiates through its integration ecosystem (2,600+ apps), threaded conversations, Slack Connect (cross-organization channels), Huddles (lightweight audio), and Workflow Builder for no-code automation.

Site Map

├── Workspace Switcher (left icon rail)
│   ├── Workspace A
│   ├── Workspace B
│   └── + Add Workspace
├── Home Tab
│   ├── Catch-Up Summary (AI-generated)
│   ├── Suggested Actions
│   └── App Home Tabs (bot/app surfaces)
├── DMs (Direct Messages)
│   ├── Recent DMs
│   ├── Multi-person DMs (group)
│   └── Self DM (personal scratchpad)
├── Activity
│   ├── Mentions & Reactions
│   ├── Threads (all threads I'm in)
│   ├── Unreads (unread channels summary)
│   └── Saved Items (bookmarked messages)
├── Channels
│   ├── Starred Channels (pinned to top)
│   ├── Public Channels (joined)
│   ├── Private Channels (joined)
│   ├── Slack Connect Channels (external orgs)
│   ├── Browse Channels (discover)
│   └── Create Channel
├── Channel View
│   ├── Channel Header
│   │   ├── Channel Name + Topic
│   │   ├── Members Count
│   │   ├── Huddle (audio/video)
│   │   ├── Pin / Bookmark bar
│   │   ├── Canvas (collaborative doc)
│   │   └── Search in Channel
│   ├── Message Stream
│   │   ├── Text Messages (rich text, Markdown-like)
│   │   ├── Files (images, documents, code snippets)
│   │   ├── Code Blocks (with syntax highlighting)
│   │   ├── Reactions (emoji)
│   │   ├── Thread Indicators (reply count)
│   │   ├── Bot / App Messages (structured blocks)
│   │   ├── Workflow Messages (forms, approvals)
│   │   ├── Link Unfurls (previews)
│   │   └── System Messages (joined, topic changed)
│   ├── Message Composer
│   │   ├── Rich Text Editor (bold, italic, lists, code, quote, link)
│   │   ├── @mentions (person, channel, @here, @channel, @everyone)
│   │   ├── /slash commands
│   │   ├── Emoji Picker (custom emoji support)
│   │   ├── File Upload (drag & drop)
│   │   ├── Audio/Video Clips (record & send)
│   │   ├── Schedule Send
│   │   └── Formatting Toolbar
│   └── Channel Details Panel (right)
│       ├── About (description, topic, created)
│       ├── Members List
│       ├── Integrations (apps, webhooks)
│       ├── Canvases
│       ├── Bookmarks
│       ├── Pinned Messages
│       ├── Files Shared
│       └── Channel Settings
├── Threads Panel
│   ├── All Threads (from all channels)
│   ├── Thread Detail
│   │   ├── Parent Message
│   │   ├── Replies
│   │   └── "Also send to channel" toggle
│   └── Unread Threads (badge)
├── Huddles
│   ├── Start Huddle (lightweight audio call)
│   ├── Screen Share
│   ├── Video (optional toggle)
│   ├── Shared Notes (live during huddle)
│   ├── Invite Others
│   └── Huddle Thread (persistent chat)
├── Canvas (collaborative docs)
│   ├── Channel Canvas
│   ├── DM Canvas
│   ├── Standalone Canvas
│   └── Canvas Elements (text, checklists, media, embeds)
├── Search
│   ├── Messages
│   ├── Files
│   ├── Channels
│   ├── People
│   └── Apps
├── Automations
│   ├── Workflow Builder
│   │   ├── Triggers (emoji reaction, form submitted, schedule, webhook)
│   │   ├── Steps (send message, create channel, collect info, external service)
│   │   └── Published Workflows
│   └── Slack Apps (custom bots, slash commands)
├── Slack Connect
│   ├── External Channel Invitations
│   ├── Shared Channels (with other organizations)
│   └── DMs with External Users
├── Apps & Integrations
│   ├── App Directory
│   ├── Installed Apps
│   ├── Custom Integrations (webhooks, bots)
│   └── App Home Tabs
├── Settings & Administration
│   ├── Preferences
│   │   ├── Notifications (per-channel, schedule, keywords)
│   │   ├── Themes & Appearance (sidebar colors, dark mode)
│   │   ├── Messages & Media (names, emoji style, inline media)
│   │   ├── Accessibility
│   │   ├── Language & Region
│   │   ├── Advanced (performance, links)
│   │   └── Audio & Video (huddle settings)
│   └── Workspace Admin
│       ├── Members & Guests
│       ├── User Groups (@team-name)
│       ├── Channel Management (default channels, prefixes)
│       ├── Permissions (who can create channels, invite, etc.)
│       ├── Authentication (SSO/SAML, 2FA)
│       ├── Message Retention & Deletion Policies
│       ├── Compliance (DLP, eDiscovery, exports)
│       ├── App Management
│       ├── Billing
│       └── Slack AI Settings
└── Slack AI (paid feature)
    ├── Channel Summaries (AI recap)
    ├── Thread Summaries
    ├── Search Answers (natural language)
    └── Catch-Up (daily digest)

Navigation Model

Layer Pattern Behavior
Workspace Rail Left icon column (36px) Workspace icons stacked vertically; notifications badge per workspace
Channel Sidebar Second column (260px) Home, DMs, Activity, Channels (organized by sections), Apps
Chat View Main content area (flex) Message stream, composer at bottom
Thread Panel Right side panel Opens inline without leaving channel
Details Panel Right side panel (replaces thread) Channel info, members, files, pins
Quick Switcher ⌘K Jump to any channel, DM, or person
Slash Commands Type / in composer Run app commands, set status, search
Message Actions Hover toolbar React, reply in thread, share, pin, bookmark, more (...)

Sidebar Structure

[Workspace Switcher Rail]
│
├── 🏠 Home
├── 💬 DMs
├── 🔔 Activity
├── ⋯ More (Canvases, Files, People, Apps)
─────────────
📌 Channels
  Sections (custom groupable):
  ├── ⭐ Starred
  │   #general
  │   #engineering
  ├── Team
  │   #team-ios
  │   #team-android
  ├── Projects
  │   #proj-redesign
  │   #proj-migration
  └── Other
      #random
      #announcements
─────────────
📱 Apps
  Slackbot
  GitHub
  Jira
─────────────
[+ Add channels]

Channel Sections (Unique to Slack)

Users can organize channels into custom collapsible sections in the sidebar (e.g., "Starred", "Team", "Projects", "Clients"). This is a key IA feature for managing large workspaces with 100+ channels.

Content Model

Entity Key Attributes Relationships
Workspace name, domain, icon, plan, settings has many Channels, Members, Apps
Channel name, topic, purpose, visibility (public/private), archived, shared (Slack Connect) has many Messages, Members, Pins, Bookmarks, Canvases
Message text (mrkdwn), blocks[] (Block Kit), user, timestamp, edited, reactions[], reply_count, reply_users[], files[] belongs to Channel; can have Thread
Thread parent_message, replies[], reply_count, last_reply extends from Message
Reaction emoji, users[] belongs to Message
File name, type, size, url, thumbnail, title, initial_comment belongs to Message and Channel
User display_name, real_name, avatar, status_emoji, status_text, timezone, role belongs to Workspace
User Group handle (@team-name), members[], channels[] belongs to Workspace
App / Bot name, icon, slash_commands[], home_tab, message_shortcuts installed in Workspace
Canvas title, content (blocks), shared_with belongs to Channel or standalone
Huddle channel, participants[], screen_share, notes belongs to Channel
Workflow name, trigger, steps[], published belongs to Workspace
Bookmark title, url, icon belongs to Channel (pinned below header)

Message Formatting (mrkdwn + Block Kit)

*bold*  _italic_  ~strikethrough~  `code`  ```code block```
> blockquote
:emoji:  @user  #channel  @here @channel @everyone
• bulleted list    1. numbered list

Block Kit (structured messages):
  section, divider, image, context, actions (buttons, menus),
  input, header, rich_text, video

Presence States

🟢 Active | 🟡 Away (idle >10 min) | ⛔ Do Not Disturb | ⚪ Offline
+ Custom status: emoji + text + expiry (e.g., 🏖 "On vacation until Friday")

User Flows

Send Message

Sidebar → Click channel → Type message → @mention if needed → Enter to send → Reactions appear

Reply in Thread

Hover message → "Reply in thread" → Thread panel opens → Type reply → Toggle "Also send to #channel" if needed → Send

Start Huddle

Channel header → 🎧 Huddle icon → Audio starts → Others join → Toggle video/screen share → Shared notes → Leave huddle

Workflow (No-Code Automation)

Workflow Builder → New Workflow → Trigger: "Emoji reaction (✅) added" → Action: "Send DM to reactor" + "Update Google Sheet" → Publish → Team uses it

Channel Discovery

Sidebar → Browse Channels → Search or scroll → Preview channel (description, member count, recent messages) → Join → Channel appears in sidebar

Slack Connect (External)

Channel Settings → Invite External → Enter partner's email → Partner accepts → Shared channel established → Cross-org messaging

Search

⌘G or Search bar → "from:@alice in:#engineering has:link after:2024-01-01" → Results with context → Click to jump to message in channel

URL / Route Structure

/                                          → Last active channel
/client/:teamId/:channelId                → Channel view
/client/:teamId/:channelId/thread/:ts     → Thread view
/client/:teamId/:channelId/canvas         → Channel canvas
/archives/:channelId                       → Channel (web view)
/archives/:channelId/p:timestamp           → Specific message (permalink)
/files/:teamId                             → Files browser
/huddle/:channelId                         → Active huddle
/app                                       → App Home
/customize/emoji                           → Custom emoji manager
/admin                                     → Workspace admin
/admin/settings                            → Workspace settings
/admin/members                             → Member management
/admin/analytics                           → Usage analytics
/intl/apps                                 → App Directory

Deep Links

slack://channel?team=:teamId&id=:channelId          → Open channel in app
slack://user?team=:teamId&id=:userId                → Open DM in app
https://:workspace.slack.com/archives/:channelId/p:timestamp → Message permalink

Search & Filter

Context Search Scope Filters Sort
Global (⌘G) Messages, files, channels, people, apps from: (person), in: (channel), has: (link/file/reaction/pin), before:/after:/on: (date), is: (saved/thread) Relevance, Recent
Channel Messages in current channel ⌘F or Search in Channel Date
Files All shared files Type, From, In Channel, Date Date, Size
People Name, display name, email Status, Role Name

Search Operators

from:@alice                   → Messages from Alice
in:#engineering               → Messages in #engineering
has:file                      → Messages with files
has::thumbsup:                → Messages with specific reaction
before:2024-06-01             → Messages before date
after:2024-01-01              → Messages after date
"exact phrase"                → Exact text match
from:me is:saved              → My saved messages
to:me                         → DMs sent to me

Responsive Behavior

Breakpoint Layout Behavior
Desktop (≥1024px) Workspace rail + sidebar + chat + thread/details panel All panels visible, resizable
Tablet (768–1023px) Sidebar + chat (thread as overlay) Two-panel mode
Mobile (<768px) Bottom tabs: Home, DMs, Mentions, Search, You Single-panel stack navigation

Mobile App

  • Swipe right for sidebar navigation
  • Swipe left on channel for mute/leave
  • Long-press message for actions
  • Voice/video clip recording (hold to record)
  • Huddle participation
  • Push notifications with inline reply
  • Widgets: unread count, recent DMs

Access Control

Role Read Public Read Private Post Manage Channels Admin
Single-Channel Guest One channel only If invited ✅ — —
Multi-Channel Guest Invited channels If invited ✅ — —
Member ✅ If joined ✅ Create, archive own —
Channel Admin ✅ If joined ✅ Edit channel settings —
Workspace Admin ✅ ✅ (audit) ✅ All channels Workspace settings
Workspace Owner ✅ ✅ ✅ ✅ Full control, billing
Org Admin (Enterprise Grid) All workspaces ✅ ✅ ✅ Cross-workspace policies

Channel Types

  • Public: Any member can find and join; messages visible to all
  • Private: Invite-only; hidden from browse; cannot be converted to public
  • Shared (Slack Connect): Visible to members of multiple organizations
  • Read-only (Announcement): Only specific people/apps can post
  • DM: 1:1 or group (up to 9 people)

Enterprise Grid

  • Organization-level: Policies cascade across all workspaces
  • Channel types: Org-wide channels spanning workspaces
  • DLP: Data loss prevention policies
  • eDiscovery: Legal hold and export
  • SCIM: Automated user provisioning