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Slack uses the same shape as Telegram: paste a token in the terminal, or finish on a page.
On a terminal, paste an App Configuration Token (xoxe.xoxp-…), or open the setup page and click Add to Slack. Without a terminal, the CLI prints the page and waits up to 15 minutes:
That flag skips the choice. Exit code 11 means the wait ran out. Run the command again. It resumes at the missing step.
An agent forwards the URL. It does not ask you for the Slack token, and it does not paste one.
Add to Slack can require a workspace admin. The docs cannot grant that. Invite someone else on Slack:
The link works for minutes, and Slack becomes their default channel. --icon is Slack-only. Pass an MCP catalog id (stripe, github) or an https URL. Other channels ignore it. --subtitle and --body draw the card on Slack the same way they do elsewhere.