Switch an active brand off: its host falls back to the platform brand and its clients' mail loses the brand; the domain stays proven and the certificate keeps renewing, so enable_whitelabel brings it back at once. The reversible stop; delete_whitelabel is the final one.

Contract:

• MCP tool disable_whitelabel, registry package mcp.id/whitelabels, mount id.partner.
• Operation action, response envelope action.
• Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API.