@type t() :: %OpenCode.Generated.SyncEventSessionNextStepEndedSyncEventData{
  assistant_message_id: String.t(),
  cost: number(),
  files: [String.t()] | nil,
  finish: String.t(),
  session_id: String.t(),
  snapshot: String.t() | nil,
  timestamp: number(),
  tokens:
    OpenCode.Generated.SyncEventSessionNextStepEndedSyncEventDataTokens.t()
}