slack-mcp-server

Overview

The Slack MCP Server by korotovsky provides comprehensive integration with Slack workspaces through the Model Context Protocol. It supports both stealth mode (no permissions required) and OAuth authentication, offering flexibility for different security requirements. The server provides extensive tools for message retrieval, posting, searching, and reaction management, with smart history fetching capabilities and support for channels, threads, DMs, and group DMs. It's designed to work with any MCP client supporting Stdio, SSE, or HTTP transports, making it highly versatile for various integration scenarios.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• conversations_historychannel_id (string, required), include_activity_messages (boolean, default: false), cursor (string, optional), limit (string, default: "1d")

  Get messages from a channel or DM by channel ID with pagination support

  Try:Get messages from #generalTry:Fetch messages from the last 7 daysTry:Get messages from a channel with ID C1234567890
• conversations_replieschannel_id (string, required), thread_ts (string, required), include_activity_messages (boolean, default: false), cursor (string, optional), limit (string, default: "1d")

  Get a thread of messages posted to a conversation

  Try:Get replies to a thread in #generalTry:Fetch messages from thread with timestamp 1234567890.123456
• conversations_add_messagechannel_id (string, required), thread_ts (string, optional), payload (string, required), content_type (string, default: "text/markdown")

  Add a message to a public channel, private channel, or direct message conversation

  Try:Post 'Hello world' to #generalTry:Add a message to a thread in #announcements
• conversations_search_messagessearch_query (string, optional), filter_in_channel (string, optional), filter_in_im_or_mpim (string, optional), filter_users_with (string, optional), filter_users_from (string, optional), filter_date_before (string, optional), filter_date_a

  Search messages in channels or DMs with various filters

  Try:Search for messages about 'project deadline'Try:Find messages from @jane in #generalTry:Search messages from last week
• channels_listchannel_types (string, required), sort (string, optional), limit (number, default: 100), cursor (string, optional)

  Get list of channels with filtering options

  Try:List all public channelsTry:Get all direct message channelsTry:List private channels sorted by popularity
• reactions_addchannel_id (string, required), timestamp (string, required), emoji (string, required)

  Add an emoji reaction to a message

  Try:Add a thumbsup reaction to message 1234567890.123456Try:React to a message in #general with heart
• reactions_removechannel_id (string, required), timestamp (string, required), emoji (string, required)

  Remove an emoji reaction from a message

  Try:Remove thumbsup reaction from message 1234567890.123456Try:Take back a rocket reaction in #general
• users_searchquery (string, required), limit (number, default: 10)

  Search for users by name, email, or display name

  Try:Find users with email 'john@example.com'Try:Search for users named 'Sarah'Try:Find user with ID U1234567890
• usergroups_listinclude_users (boolean, default: false), include_count (boolean, default: true), include_disabled (boolean, default: false)

  List all user groups (subteams) in the workspace

  Try:List all user groupsTry:Get user groups with user countsTry:List all groups including disabled ones
• usergroups_createname (string, required), handle (string, optional), description (string, optional), channels (string, optional)

  Create a new user group in the workspace

  Try:Create a user group called 'Engineering Team'Try:Make a new group with handle 'devs' and description for developers
• usergroups_updateusergroup_id (string, required), name (string, optional), handle (string, optional), description (string, optional), channels (string, optional)

  Update an existing user group's metadata

  Try:Update the name of user group S1234567890Try:Change description for Engineering Team
• usergroups_users_updateusergroup_id (string, required), users (string, required)

  Update the members of a user group, replacing existing members

  Try:Set members of Engineering Team to U123,U456Try:Replace all users in group S1234567890 with new list

Comparable tools

Installation

go install github.com/korotovsky/slack-mcp-server@latest

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

export SLACK_MCP_TOKEN="xoxc-your-token-here"

export SLACK_MCP_TOKEN="xoxp-your-oauth-token-here"

export SLACK_MCP_ADD_MESSAGE_TOOL="true"  # or specific channel IDs

FAQ

Does this server require bot installation in Slack?

No, it can run in stealth mode without requiring any permissions or bot installation, though OAuth mode is also available for more secure access.

Can I post messages using this server?

Message posting is disabled by default for safety. You can enable it by setting the SLACK_MCP_ADD_MESSAGE_TOOL environment variable.

On Hacker News

Recent discussion from the developer community.

• The most powerful MCP Slack Server with no permission requirements on Workspaces▲ 2
  Story by korotovskii · 2025-05-19
• The most powerful MCP Slack Server with no permission requirements on Workspaces▲ 1💬 1
  Story by korotovskii · 2025-04-27
• Slack MCP Server▲ 1
  Story by rusq · 2026-02-24

Compare slack-mcp-server with