The most powerful MCP Slack Server with no permission requirements on Workspaces

Model Context Protocol (MCP) server for Slack Workspaces. This integration supports both Stdio and SSE transports, proxy settings and does not require any permissions or bots being created or approved by Workspace admins 😏.

1. conversations_history

• Get messages from the channel by channelID
• Required inputs:
  • channel_id (string): ID of the channel in format Cxxxxxxxxxx.
  • cursor (string): Cursor for pagination. Use the value of the last row and column in the response as next_cursor field returned from the previous request.
  • limit (number, default: 28): Limit of messages to fetch.
• Returns: List of messages with timestamps, user IDs, and text content

2. channels_list

• Get list of channels
• Required inputs:
  • channel_types (array): Possible channel types. Allowed values: 'mpim', 'im', 'public_channel', 'private_channel'.
  • sort (string): Type of sorting. Allowed values: 'popularity' - sort by number of members/participants in each channel.
• Returns: List of channels

Open up your Slack in your browser and login.

• Open your browser's Developer Console.
• In Firefox, under Tools -> Browser Tools -> Web Developer tools in the menu bar
• In Chrome, click the "three dots" button to the right of the URL Bar, then select More Tools -> Developer Tools
• Switch to the console tab.
• Type "allow pasting" and press ENTER.
• Paste the following snippet and press ENTER to execute: JSON.parse(localStorage.localConfig_v2).teams[document.location.pathname.match(/^\/client\/([A-Z0-9]+)/)[1]].token

Token value is printed right after the executed command (it starts with xoxc-), save it somewhere for now.

• Switch to "Application" tab and select "Cookies" in the left navigation pane.
• Find the cookie with the name d. That's right, just the letter d.
• Double-click the Value of this cookie.
• Press Ctrl+C or Cmd+C to copy it's value to clipboard.
• Save it for later.

Choose one of these installation methods:

• npx
• Docker

You can configure the MCP server using command line arguments and environment variables.

If you have npm installed, this is the fastest way to get started with slack-mcp-server on Claude Desktop.

Open your claude_desktop_config.json and add the mcp server to the list of mcpServers:

Please see Docker for more information.

In case you would like to run it in sse mode, then you should use mcp-remote wrapper for Claude Desktop and deploy/expose MCP server somewhere e.g. with ngrok or docker-compose.

There are several reasons why you might need to setup HTTPS for your SSE.

• mcp-remote is capable to handle only https schemes;
• it is generally a good practice to use TLS for any service exposed to the internet;

You could use ngrok:

and then use the endpoint https://903d-xxx-xxxx-xxxx-10b4.ngrok-free.app for your mcp-remote argument.

For detailed information about all environment variables, see Environment Variables.

Or, the docker-compose way:

• Never share API tokens
• Keep .env files secure and private

Licensed under MIT - see LICENSE file. This is not an official Slack product.