@type t() :: %OpenCode.Generated.FilePart{
  filename: String.t() | nil,
  id: String.t(),
  message_id: String.t(),
  mime: String.t(),
  session_id: String.t(),
  source:
    OpenCode.Generated.FileSource.t()
    | OpenCode.Generated.ResourceSource.t()
    | OpenCode.Generated.SymbolSource.t()
    | nil,
  type: String.t(),
  url: String.t()
}