Function registerAsyncAgent

src/tasks/LocalAgentTask/LocalAgentTask.tsx:466–515

({
  agentId,
  description,
  prompt,
  selectedAgent,
  setAppState,
  parentAbortController,
  toolUseId
}: {
  agentId: string;
  description: string;
  prompt: string;
  selectedAgent: AgentDefinition;
  setAppState: SetAppState;
  parentAbortController?: AbortController;
  toolUseId?: string;
})

 *   This ensures subagents are aborted when their parent (e.g., in-process teammate) aborts.
 */
export function registerAsyncAgent({
  agentId,
  description,
  prompt,
  selectedAgent,
  setAppState,
  parentAbortController,
  toolUseId
}: {
  agentId: string;
  description: string;
  prompt: string;
  selectedAgent: AgentDefinition;
  setAppState: SetAppState;
  parentAbortController?: AbortController;
  toolUseId?: string;
}): LocalAgentTaskState {
  void initTaskOutputAsSymlink(agentId, getAgentTranscriptPath(asAgentId(agentId)));

  // Create abort controller - if parent provided, create child that auto-aborts with parent
  const abortController = parentAbortController ? createChildAbortController(parentAbortController) : createAbortController();
  const taskState: LocalAgentTaskState = {
    ...createTaskStateBase(agentId, 'local_agent', description, toolUseId),
    type: 'local_agent',
    status: 'running',
    agentId,
    prompt,
    selectedAgent,
    agentType: selectedAgent.agentType ?? 'general-purpose',
    abortController,
    retrieved: false,
    lastReportedToolCount: 0,
    lastReportedTokenCount: 0,
    isBackgrounded: true,
    // registerAsyncAgent immediately backgrounds
    pendingMessages: [],
    retain: false,
    diskLoaded: false
  };

  // Register cleanup handler
  const unregisterCleanup = registerCleanup(async () => {
    killAsyncAgent(agentId, setAppState);
  });
  taskState.unregisterCleanup = unregisterCleanup;

  // Register task in AppState
  registerTask(taskState, setAppState);
  return taskState;
}

// Map of taskId -> resolve function for background signals
// When backgroundAgentTask is called, it resolves the corresponding promise