Slack - Piebald

To use Slack’s official MCP server inside Piebald, you’ll need to make a Slack app inside the workspace you’re going to log in with. Then, you can add Slack as an HTTP MCP server with a custom OAuth Client ID.

Go to https://api.slack.com/apps.
Click Create an App (or Create New App).
Choose From a manifest.
Choose the workspace you’ll be using the MCP server with, and click Next.

Paste the following into the JSON tab of the dialog, inside the code editor, replacing all existing text:

{
  "display_information": {
      "name": "Piebald",
      "description": "The ultimate agentic AI control experience for developers.",
      "background_color": "#2c2d30",
      "long_description": "Piebald is a desktop & web app that makes it easier than ever to do agentic development, while at the same time giving you complete control over the configuration, context, and flow, all from a powerful desktop & web UI that runs on macOS, Windows, and Linux."
  },
  "oauth_config": {
      "redirect_urls": [
          "https://piebald.ai/desktop/redirect"
      ],
      "scopes": {
          "user": [
              "canvases:read",
              "canvases:write",
              "channels:history",
              "chat:write",
              "groups:history",
              "im:history",
              "mpim:history",
              "search:read.files",
              "search:read.im",
              "search:read.mpim",
              "search:read.private",
              "search:read.public",
              "search:read.users",
              "users:read",
              "users:read.email"
          ]
      },
      "pkce_enabled": false
  },
  "settings": {
      "org_deploy_enabled": false,
      "socket_mode_enabled": false,
      "token_rotation_enabled": false
  }
}

Click Next.
You should be presented with a Review summary & create your app dialog. Click Create.
From the Features section in the left-hand sidebar, go to OAuth & Permissions.
In the Proof Key for Code Exchange (PKCE) section, click the Opt In button.

You should be prompted again to permanently enable PKCE. Click Opt In.
From Features in the sidebar, go to Agents & AI Apps.
Enable Model Context Protocol.

From the Settings section in the sidebar, go to Basic Information.
Copy the value of the Client ID input box.

In Piebald, go to Settings → MCP Servers and click Add → Add Server.
Enter a name for the MCP server (e.g. Slack).
For Transport Type, select HTTP.
Enter https://mcp.slack.com/mcp as the Server URL.
Expand Advanced OAuth Settings, and then paste the Client ID you copied from Slack into the Client ID input box.

Click Create & Authenticate at the bottom of the dialog.
After a few seconds, a browser tab should open, be prompting you to allow Piebald to access Slack. Click Allow.

Return to Piebald, and check that the MCP server is green:

Close the Settings dialog.

You should now be able to use the Slack MCP server!

Documentation Index