Function claimTaskWithBusyCheck

src/utils/tasks.ts:619–693

* Claims a task with an atomic check for agent busy status. * Uses a task-list-level lock to ensure the busy check and claim are atomic.

(
  taskListId: string,
  taskId: string,
  claimantAgentId: string,
)

 * Uses a task-list-level lock to ensure the busy check and claim are atomic.
 */
async function claimTaskWithBusyCheck(
  taskListId: string,
  taskId: string,
  claimantAgentId: string,
): Promise<ClaimTaskResult> {
  const lockPath = await ensureTaskListLockFile(taskListId)

  let release: (() => Promise<void>) | undefined
  try {
    // Acquire exclusive lock on the task list
    release = await lockfile.lock(lockPath, LOCK_OPTIONS)

    // Read all tasks to check agent status and task state atomically
    const allTasks = await listTasks(taskListId)

    // Find the task we want to claim
    const task = allTasks.find(t => t.id === taskId)
    if (!task) {
      return { success: false, reason: 'task_not_found' }
    }

    // Check if already claimed by another agent
    if (task.owner && task.owner !== claimantAgentId) {
      return { success: false, reason: 'already_claimed', task }
    }

    // Check if already resolved
    if (task.status === 'completed') {
      return { success: false, reason: 'already_resolved', task }
    }

    // Check for unresolved blockers (open or in_progress tasks block)
    const unresolvedTaskIds = new Set(
      allTasks.filter(t => t.status !== 'completed').map(t => t.id),
    )
    const blockedByTasks = task.blockedBy.filter(id =>
      unresolvedTaskIds.has(id),
    )
    if (blockedByTasks.length > 0) {
      return { success: false, reason: 'blocked', task, blockedByTasks }
    }

    // Check if agent is busy with other unresolved tasks
    const agentOpenTasks = allTasks.filter(
      t =>
        t.status !== 'completed' &&
        t.owner === claimantAgentId &&
        t.id !== taskId,
    )
    if (agentOpenTasks.length > 0) {
      return {
        success: false,
        reason: 'agent_busy',
        task,
        busyWithTasks: agentOpenTasks.map(t => t.id),
      }
    }