deepseek-ai/deepseek-harness · error · TerminalError

DUPLICATE_NAME

DUPLICATE_NAME

Error message

PTY session name "${name}" already exists for this owner

What it means

Error "PTY session name "${name}" already exists for this owner" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/terminal/terminal/src/index.ts:338

  }

  private ensureOwnerCleanup(owner: Agent): void {
    if (!this.isLiveOwner(owner)) {
      throw new TerminalError(`agent "${owner.id}" is not the registered PTY owner`, 'OWNER_NOT_LIVE')
    }
    if (this.ownerCleanups.has(owner)) return
    const detach = owner.ctx.effect(() => async () => {
      this.disposedOwners.add(owner)
      this.ownerCleanups.delete(owner)
      await this.disposeOwned(owner)
    }, 'pty.ownerCleanup()')
    this.ownerCleanups.set(owner, detach)
  }

  private reserveName(owner: Agent, name: string | undefined): () => void {
    if (name === undefined) return () => {}
    if ([...this.sessions.values()].some(record => record.owner === owner && record.name === name)) {
      throw new TerminalError(`PTY session name "${name}" already exists for this owner`, 'DUPLICATE_NAME')
    }
    const reserved = this.reservedNames.get(owner) ?? new Set<string>()
    if (reserved.has(name)) throw new TerminalError(`PTY session name "${name}" is already being created`, 'DUPLICATE_NAME')
    reserved.add(name)
    this.reservedNames.set(owner, reserved)
    return () => {
      reserved.delete(name)
      if (reserved.size === 0) this.reservedNames.delete(owner)
    }
  }

  private reserveSpawn(owner: Agent): SpawnReservation {
    const controller = new AbortController()
    const settlement = Promise.withResolvers<void>()
    const pending: PendingSpawn = { owner, controller, settled: settlement.promise, cleanupFailure: undefined }
    const owned = this.pendingSpawns.get(owner) ?? new Set<PendingSpawn>()
    owned.add(pending)
    this.pendingSpawns.set(owner, owned)

View on GitHub (pinned to b150a551b8)

Solutions

1. Pick a unique session name for this owner, or close the existing session with that name first.

When it happens

Trigger: Thrown at packages/terminal/terminal/src/index.ts:338 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/30801fac410ac8c3. Report an issue: GitHub.