Function updateSpawnAgentBlock

cli/src/utils/sdk-event-handlers.ts:361–424

(
  block: ContentBlock,
  toolCallId: string,
  results: any[],
)

 * Recursively finds and updates agent blocks that match a spawn_agents tool call.
 */
const updateSpawnAgentBlock = (
  block: ContentBlock,
  toolCallId: string,
  results: any[],
): ContentBlock | null => {
  if (block.type !== 'agent') {
    return block
  }

  const spawnIndex = block.spawnIndex
  const childBlocks = block.blocks
  const isSpawnResultTarget =
    block.spawnToolCallId === toolCallId &&
    spawnIndex !== undefined &&
    childBlocks

  if (isSpawnResultTarget) {
    const result = results[spawnIndex]
    if (result?.value) {
      const { content, hasError } = extractSpawnAgentResultContent(result.value)

      if (hasError) {
        if (childBlocks.length === 0) {
          return null
        }

        return {
          ...block,
          blocks: content
            ? [...childBlocks, { type: 'text', content } as ContentBlock]
            : childBlocks,
          status: 'complete' as const,
        }
      }

      // Agents like thinker return all output at the end via lastMessage,
      // while agents like basher may have already streamed their text.
      const hasStreamedTextContent = childBlocks.some(
        (b) => b.type === 'text' && b.textType === 'text',
      )
      const finalBlocks =
        content && !hasStreamedTextContent
          ? [...childBlocks, { type: 'text', content } as ContentBlock]
          : childBlocks

      if (finalBlocks.length > 0) {
        return {
          ...block,
          blocks: finalBlocks,
          status: 'complete' as const,
        }
      }
    }
  }

  if (!childBlocks?.length) {
    return block
  }