@Cloud9 Labs/ Slack

MCP server for Slack API integration - 14 messaging and channel management tools.

Installation

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["-y", "@cloud9-labs/mcp-slack"],
      "env": {
        "SLACK_BOT_TOKEN": "xoxb-your-bot-token"
      }
    }
  }
}

Tools

Tool	Description
slack_post_message	Send a message to a Slack channel
slack_update_message	Edit an existing message
slack_delete_message	Delete a message from a channel
slack_list_channels	List all channels in the workspace
slack_get_channel_info	Get detailed information about a channel
slack_get_channel_history	Retrieve message history from a channel
slack_get_replies	Get threaded replies for a message
slack_join_channel	Join a Slack channel
slack_list_users	List all users in the workspace
slack_get_user_info	Get user profile information
slack_add_reaction	Add emoji reaction to a message
slack_remove_reaction	Remove emoji reaction from a message
slack_search_messages	Search messages across channels
slack_upload_file	Upload files to Slack

Configuration

Set your Slack bot token as an environment variable:

export SLACK_BOT_TOKEN="xoxb-..."

To create a Slack bot:

1. Go to https://api.slack.com/apps
2. Create a new app
3. Enable Bot User OAuth Token
4. Grant required scopes (messages:write, channels:read, users:read, etc.)
5. Copy the Bot User OAuth Token

License

MIT