Use Arialine from Slack's built-in assistant

Arialine exposes an MCP server at https://slack.arialine.app/mcp using Slack identity authentication. A Slack app administrator can register that URL in App Settings → MCP Servers with the Slack identity auth method.

Slack's built-in assistant can then invoke Arialine tools to list boards, read history and decisions, create or edit diagrams, propose changes, undo, rewind, branch, brainstorm, export, and place a diagram on a Canvas.

MCP does not bypass Arialine's workspace access rules or replace the native Slack app. It is another invocation surface for the same product capabilities, and only Slack-signed requests are accepted.