slack-mcp.md

Slack MCP Server

MCP server

from"korotovsky"

1.9k

slack-mcp-server by korotovsky is the most-starred community Slack MCP server. Slack does not maintain it. It reads channel, thread and DM history, searches messages and lists unread messages. Posting is available but switched off until you enable it.

Source and setup verified on 2026-11-03

Communication

Slackmessagingchannelsworkspace

View on GitHub

Quick facts

Maintainer: korotovsky (community, not Slack)
Auth: xoxp user token, xoxb bot token, or xoxc/xoxd browser tokens
Transports: stdio, SSE, HTTP
Install: npx, or .dxt extension for Claude Desktop
Posting: Off by default (SLACK_MCP_ADD_MESSAGE_TOOL)

>See it running

Analytics demo from the project README. Source

Posting a message, after enabling the add-message tool. Source

What you can do

Fetch channel, thread and DM history by date range or message count
Search messages with date, user and content filters
List unread messages across channels, DMs first, and mark them read
Post messages, only after you enable it, optionally limited to listed channels

Requirements

Node.js, for the npx install
One Slack token: xoxp, xoxb, or the xoxc + xoxd pair
A bot token (xoxb) only sees channels it was invited to and cannot search

setup.md

# 1. Get a token

The repository's docs/01-authentication-setup.md explains each token type.

# 2. Add the server to your client

Paste the config below and replace the token.

# 3. Restart the client

Then ask, for example, for a summary of yesterday's messages in #general.

# Claude Desktop → claude_desktop_config.json

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["-y", "slack-mcp-server@latest", "--transport", "stdio"],
      "env": {
        "SLACK_MCP_XOXP_TOKEN": "xoxp-..."
      }
    }
  }
}

Claude Desktop users can instead download slack-mcp-server.dxt from the latest release and drop it on Settings → Extensions.

Always confirm the latest setup instructions with the maintainer before installing.

>Questions

Is this the official Slack MCP server?

No. It is an independent open-source project by korotovsky.

Which token should I use?

A user token (xoxp) works for most tools without extracting browser cookies. A bot token (xoxb) is limited to invited channels and has no search. Some tools, such as unread counts and mark-as-read, work best or only with xoxc/xoxd browser tokens.

How do I let it post messages?

Set SLACK_MCP_ADD_MESSAGE_TOOL to true for all channels, or to a comma-separated list of channel IDs to allow only those.

It fails on Enterprise Slack

Set SLACK_MCP_USER_AGENT to the browser User-Agent you took the tokens from and enable SLACK_MCP_CUSTOM_TLS.

>Related Apps

Gmail MCP server with inline inbox, composer, PDF signing, and account settings React apps

Gmailinboxcomposer

outlook-classic-mcp-apps.md

export outlook-classic-mcp-apps

UI App

from "anasahmed07"

Local Outlook server with inline inbox, mail reader, calendar agenda, contacts, and task-management views

Outlookmailcalendar

telnyx-mcp-apps.md

export telnyx-mcp-apps

UI App

from "team-telnyx"

Official Telnyx collection with embedded interfaces for voice monitoring, phone-number intelligence, and communications usage and cost exploration

Telnyxvoicenumber intelligence