Function executeSubAgent

extensions/cli/src/subagent/executor.ts:58–213

(
  options: SubAgentExecutionOptions,
)

 */
// eslint-disable-next-line complexity
export async function executeSubAgent(
  options: SubAgentExecutionOptions,
): Promise<SubAgentResult> {
  const { agent: subAgent, prompt, abortController, onOutputUpdate } = options;

  const mainAgentPermissionsState =
    await serviceContainer.get<ToolPermissionServiceState>(
      SERVICE_NAMES.TOOL_PERMISSIONS,
    );

  try {
    logger.debug("Starting subagent execution", {
      agent: subAgent.model?.name,
    });

    const { model, llmApi } = subAgent;
    if (!model || !llmApi) {
      throw new Error("Model or LLM API not available");
    }

    // allow all tools for now
    // todo: eventually we want to show the same prompt in a dialog whether asking whether that tool call is allowed or not

    serviceContainer.set<ToolPermissionServiceState>(
      SERVICE_NAMES.TOOL_PERMISSIONS,
      {
        ...mainAgentPermissionsState,
        permissions: {
          policies: [{ tool: "*", permission: "allow" }],
        },
      },
    );

    // Build agent system message
    const systemMessage = await buildAgentSystemMessage(subAgent, services);

    // Store original system message function
    const originalGetSystemMessage = services.systemMessage?.getSystemMessage;

    // Store original ChatHistoryService ready state
    const chatHistorySvc = services.chatHistory;
    const originalIsReady =
      chatHistorySvc && typeof chatHistorySvc.isReady === "function"
        ? chatHistorySvc.isReady
        : undefined;

    // Override system message for this execution
    if (services.systemMessage) {
      services.systemMessage.getSystemMessage = async () => systemMessage;
    }

    // Temporarily disable ChatHistoryService to prevent it from interfering with child session
    if (chatHistorySvc && originalIsReady) {
      chatHistorySvc.isReady = () => false;
    }

    const chatHistory = [
      {