Function finalizeAgentTool

src/tools/AgentTool/agentToolUtils.ts:276–357

(
  agentMessages: MessageType[],
  agentId: string,
  metadata: {
    prompt: string
    resolvedAgentModel: string
    isBuiltInAgent: boolean
    startTime: number
    agentType: string
    isAsync: boolean
  },
)

}

export function finalizeAgentTool(
  agentMessages: MessageType[],
  agentId: string,
  metadata: {
    prompt: string
    resolvedAgentModel: string
    isBuiltInAgent: boolean
    startTime: number
    agentType: string
    isAsync: boolean
  },
): AgentToolResult {
  const {
    prompt,
    resolvedAgentModel,
    isBuiltInAgent,
    startTime,
    agentType,
    isAsync,
  } = metadata

  const lastAssistantMessage = getLastAssistantMessage(agentMessages)
  if (lastAssistantMessage === undefined) {
    throw new Error('No assistant messages found')
  }
  // Extract text content from the agent's response. If the final assistant
  // message is a pure tool_use block (loop exited mid-turn), fall back to
  // the most recent assistant message that has text content.
  let content = lastAssistantMessage.message.content.filter(
    _ => _.type === 'text',
  )
  if (content.length === 0) {
    for (let i = agentMessages.length - 1; i >= 0; i--) {
      const m = agentMessages[i]!
      if (m.type !== 'assistant') continue
      const textBlocks = m.message.content.filter(_ => _.type === 'text')
      if (textBlocks.length > 0) {
        content = textBlocks
        break
      }
    }
  }

  const totalTokens = getTokenCountFromUsage(lastAssistantMessage.message.usage)
  const totalToolUseCount = countToolUses(agentMessages)

  logEvent('tengu_agent_tool_completed', {
    agent_type:
      agentType as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    model:
      resolvedAgentModel as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    prompt_char_count: prompt.length,
    response_char_count: content.length,
    assistant_message_count: agentMessages.length,
    total_tool_uses: totalToolUseCount,
    duration_ms: Date.now() - startTime,
    total_tokens: totalTokens,
    is_built_in_agent: isBuiltInAgent,