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Slack MCP Server

Slack channel management, message posting, and user data retrieval via AI.

Data last scanned yesterday · Reviewed 2 months ago

168 tools★ 293JavaScriptMIT

Overview

Slack MCP Server provides a suite of tools for interacting with Slack workspaces directly through an AI interface. Users can list public channels, retrieve channel history, and access detailed user profiles, making it useful for querying team communications and workspace structures. The server also supports active communication features, allowing AI models to post messages to specific channels, reply to existing threads, and add emoji reactions to messages. It is designed to work with Slack apps configured with the necessary scopes like chat:write and channels:history.

Our verdict

This server is assigned a high-risk security score of 0/100 and should not be used in sensitive environments. The repository is officially archived, meaning it is no longer maintained and will not receive security patches or bug fixes. Furthermore, the lack of an authentication method means that anyone with access to the configuration can execute commands, posing a significant security risk for any workspace.

Uses only one direct dependency
Provides documented tools for message and thread management
Released under the MIT license

Repository is archived and no longer maintained
No authentication method implemented
Last code commit occurred over 400 days ago

Setup

Claude Desktop

{
  "mcpServers": {
    "slack": {
      "args": [
        "-y",
        "@modelcontextprotocol/server-slack"
      ],
      "command": "npx"
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows), then restart Claude Desktop. Some servers require API keys or tokens as environment variables — check the project's README and add an "env" object if needed.

No read-only mode — running this grants full read/write access.
No built-in authentication — anyone with access to this config can invoke every tool it exposes.

Tools

Tool	Description	Risk
slack_list_channels	List public or pre-defined channels in the workspace	low
slack_post_message	Post a new message to a Slack channel	medium
slack_reply_to_thread	Reply to a specific message thread	medium
slack_add_reaction	Add an emoji reaction to a message	medium
slack_get_channel_history	Get recent messages from a channel	low
slack_get_thread_replies	Get all replies in a message thread	low
slack_get_users	Get list of workspace users with basic profile information	low
slack_get_user_profile	Get detailed profile information for a specific user	low

Compatibility

Client	Local	Docker	Remote	Read-only
ChatGPT
Claude Desktop
Cursor
VS Code
Windsurf

Frequently asked questions

›What Slack API scopes are required for this server?

You must grant the following Bot Token Scopes: channels:history, channels:read, chat:write, reactions:write, users:read, and users.profile:read.

›Which environment variables are needed to configure the server?

You must provide SLACK_BOT_TOKEN (the xoxb- token) and SLACK_TEAM_ID. Additionally, you may optionally provide SLACK_CHANNEL_IDS to specify authorized channels.

›Does the Slack MCP server support pagination?

Yes, for tools like slack_list_channels and slack_get_users, you can provide an optional cursor input to navigate paginated results.

›What is the format for the reaction emoji input?

The reaction tool expects the name of the emoji without the colons, such as 'thumbsup'.