Slack MCP Server

What it does

This server connects AI assistants to Slack Workspaces, enabling the AI to read messages, manage threads, and track unread notifications across channels and DMs. It supports both official OAuth and a "stealth mode" for easier integration without complex permission setups.

Tools

• conversations_history: Fetch messages from channels or DMs with pagination.
• conversations_replies: Retrieve entire threads based on a timestamp.
• conversations_add_message: Post messages to channels (disabled by default for safety).
• conversations_search_messages: Powerful search across public/private channels and DMs.
• channels_list: List workspace channels by type.
• reactions_add/reactions_remove: Manage emoji reactions to messages.
• users_search: Find workspace users by name or email.
• usergroups_list/create/update: Manage Slack user groups.
• conversations_unreads: Efficiently fetch unread messages across the workspace.
• conversations_mark: Mark conversations as read.

Installation

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["-y", "slack-mcp-server"]
    }
  }
}

Supported hosts

• Claude Desktop
• Claude Code
• Cursor
• Gemini CLI
• HuggingChat
• IBM Bob
• Kiro CLI/IDE
• Le Chat (Mistral)
• Mistral Vibe
• OpenCode
• VS Code
• Windsurf