deepseek-ai/deepseek-harness · error · ManualCompactionError

busy

busy

Error message

manual compaction: the session already has an open turn

What it means

Error "manual compaction: the session already has an open turn" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/compaction/compaction-basic/src/region.ts:173

  start: number,
  end: number,
  agent: Agent,
  options: CompactionTransactionOptions,
  signal?: AbortSignal,
): Promise<CompactionResult> {
  if (options.owner === null) signal?.throwIfAborted()
  const selection = validateSurfaceRegion(session, start, end)
  const entryState = inspectCompactionEntryState(session.events)
  assertCompactionInactive(
    entryState.unmatchedCompactionStart,
    entryState.latestEndSeedSeq,
    'compaction',
  )

  let owner: number | null
  if (options.owner === null) {
    if (entryState.openTurn !== null) {
      throw new ManualCompactionError('busy', 'manual compaction: the session already has an open turn')
    }
    owner = null
  } else {
    if (entryState.openTurn === null) {
      throw new Error('compactRegion: no open turn — automatic compaction events must be enclosed in a turn')
    }
    owner = entryState.openTurn
  }

  const compactionId = CompactionId(randomUUID())
  const lifecycle = {
    compactionId,
    ...options.sourceCommandId === undefined ? {} : { sourceCommandId: options.sourceCommandId },
    turn: owner,
  }
  const startEvent = session.append('compaction/start', lifecycle)
  const assertStable: StabilityCheck = options.stability === 'whole-surface'
    ? assertWholeSurfaceUnchanged

View on GitHub (pinned to b150a551b8)

Solutions

1. Close the open turn before running manual compaction.

When it happens

Trigger: Thrown at packages/compaction/compaction-basic/src/region.ts:173 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/a8e432ccf168fa3f. Report an issue: GitHub.