deepseek-ai/deepseek-harness · error · ManualCompactionError

changed

changed

Error message

the compacted history changed during manual compaction

What it means

Error "the compacted history changed during manual compaction" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/compaction/compaction-basic/src/region.ts:266

      { cause: flushFailure },
    )
  }
  /* v8 ignore next -- every path without a result records and throws a failure above. */
  if (result === undefined) throw new Error('compaction committed without a result')
  return result
}

/** Classify one closed manual attempt without weakening cancellation precedence. */
function throwManualFailure(failure: TransactionFailure): never {
  if (failure.stage === 'commit') {
    throw new ManualCompactionError(
      'commit',
      'manual compaction did not commit cleanly',
      { cause: failure.error },
    )
  }
  if (failure.error instanceof SurfaceChangedError) {
    throw new ManualCompactionError(
      'changed',
      'the compacted history changed during manual compaction',
      { cause: failure.error },
    )
  }
  throw new ManualCompactionError(
    'summary',
    'manual compaction could not produce a smaller summary',
    { cause: failure.error },
  )
}

/**
 * Reject a durable unmatched compaction marker unless a later constructor-seed
 * boundary proves that its owner belongs to an earlier session lifecycle.
 * @param unmatchedCompactionStart - latest unmatched opening marker, if any.
 * @param latestEndSeedSeq - newest constructor-seed boundary, if any.
 * @param stage - operation label included in the busy diagnostic.

View on GitHub (pinned to b150a551b8)

Solutions

1. Retry manual compaction when the history is not changing concurrently.

When it happens

Trigger: Thrown at packages/compaction/compaction-basic/src/region.ts:266 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/a6010f3207d3cbe4. Report an issue: GitHub.