@type t() :: %Gleanex.Client.ChatMessageFragment{
  action: Gleanex.Client.ToolInfo.t() | nil,
  citation: Gleanex.Client.ChatMessageCitation.t() | nil,
  file: Gleanex.Client.ChatFile.t() | nil,
  querySuggestion: Gleanex.Client.QuerySuggestion.t() | nil,
  serverToolRequest: Gleanex.Client.ServerToolRequest.t() | nil,
  serverToolResponse: Gleanex.Client.ServerToolResponse.t() | nil,
  structuredResults: [Gleanex.Client.StructuredResult.t()] | nil,
  text: String.t() | nil,
  trackingToken: String.t() | nil
}