Slack MCP Server

An MCP server implementation that enables Claude to interact with Slack workspaces through the Slack API.

Installation

npm install @microagents/server-slack
# or
yarn add @microagents/server-slack

Usage

Direct Execution

# Set your API tokens and run
SLACK_BOT_TOKEN=xoxb-your-token SLACK_TEAM_ID=T0123456 npx @microagents/server-slack

With Claude Desktop

Add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["@microagents/server-slack"],
      "env": {
        "SLACK_BOT_TOKEN": "xoxb-your-token",
        "SLACK_TEAM_ID": "T0123456"
      }
    }
  }
}

Setup

1. Create a Slack App:

   • Go to Slack API: Applications
   • Click "Create New App" and choose "From scratch"
   • Name your app and select your workspace

2. Add Bot Scopes:

   • Navigate to "OAuth & Permissions"
   • Under "Scopes", add these Bot Token Scopes:
     • channels:history
     • channels:read
     • chat:write
     • reactions:write
     • users:read

3. Install the App:

   • Click "Install to Workspace"
   • Authorize the requested permissions

4. Get Credentials:

   • Copy the "Bot User OAuth Token" (starts with xoxb-)
   • Get your Team ID from your Slack URL or workspace settings

Features

• Channel Management: List channels and retrieve channel history
• Messaging: Send messages to channels and threads
• Reactions: Add emoji reactions to messages
• User Information: Get user details and profiles

Tools

listChannels

List all channels in the workspace.

Inputs:

• types (string, optional): Types of channels to include (public, private, mpim, im)
• excludeArchived (boolean, optional): Whether to exclude archived channels

getChannelHistory

Get message history from a channel.

Inputs:

• channelId (string): ID of the channel
• limit (number, optional): Number of messages to retrieve
• oldest (string, optional): Start of time range (timestamp)
• latest (string, optional): End of time range (timestamp)

postMessage

Send a message to a channel or thread.

Inputs:

• channelId (string): ID of the channel
• text (string): Message text
• threadTs (string, optional): Thread timestamp to reply to

addReaction

Add an emoji reaction to a message.

Inputs:

• channelId (string): ID of the channel
• timestamp (string): Timestamp of the message
• name (string): Name of the emoji

getUserInfo

Get information about a user.

Inputs:

• userId (string): ID of the user

License

MIT

Credits

Based on the original MCP server by the Model Context Protocol team.