Function handleSubagentStart

cli/src/utils/sdk-event-handlers.ts:165–240

(
  state: EventHandlerState,
  event: PrintModeSubagentStart,
)

}

const handleSubagentStart = (
  state: EventHandlerState,
  event: PrintModeSubagentStart,
) => {
  if (shouldHideAgent(event.agentType)) {
    return
  }

  state.subagents.addActiveSubagent(event.agentId)

  const spawnAgentMatch = findMatchingSpawnAgent(
    state.streaming.streamRefs.state.spawnAgentsMap,
    event.agentType || '',
  )

  if (spawnAgentMatch) {
    state.message.updater.updateAiMessageBlocks((blocks) =>
      resolveSpawnAgentToReal({
        blocks,
        match: spawnAgentMatch,
        realAgentId: event.agentId,
        realAgentType: event.agentType,
        parentAgentId: event.parentAgentId,
        params: event.params,
        prompt: event.prompt,
      }),
    )

    updateStreamingAgents(state, {
      remove: spawnAgentMatch.tempId,
      add: event.agentId,
    })
    state.streaming.streamRefs.setters.removeSpawnAgentInfo(
      spawnAgentMatch.tempId,
    )
    return
  }

  state.logger.info(
    {
      agentId: event.agentId,
      agentType: event.agentType,
      parentAgentId: event.parentAgentId || 'ROOT',
    },
    'Creating new agent block (no spawn_agents match)',
  )

  state.message.updater.updateAiMessageBlocks((blocks) => {
    // Look up the parent agent's type if there's a parent agent ID
    const parentAgentType = event.parentAgentId
      ? findAgentTypeById(blocks, event.parentAgentId)
      : undefined

    const newAgentBlock = createAgentBlock({
      agentId: event.agentId,
      agentType: event.agentType || '',
      prompt: event.prompt,
      params: event.params,