packages/runtime/src/history-compact-error.ts

export type HistoryCompactSummarizerFailureReason = 'output_length' | 'provider_error';

export class HistoryCompactSummarizerError extends Error {
  constructor(
    readonly reason: HistoryCompactSummarizerFailureReason,
    options?: ErrorOptions,
  ) {
    super(`History compact summarizer failed: ${reason}`, options);
    this.name = 'HistoryCompactSummarizerError';
  }
}