Method getHistoryForAgent

packages/node-runtime/src/ai/chats.ts:878–934

(
    aiChatId: string,
    maxMessages?: number,
    leafMessageId?: string | null
  )

  // ==================== Agent 专用 ====================

  getHistoryForAgent(
    aiChatId: string,
    maxMessages?: number,
    leafMessageId?: string | null
  ): Array<{ role: 'user' | 'assistant' | 'summary'; content: string; contentBlocks?: ContentBlock[] }> {
    const messages = this.getActivePathRows(aiChatId, leafMessageId).map((row) => this.parseMessageRow(row))
    const validMessages = messages.filter(
      (m) =>
        (m.role === 'user' || m.role === 'assistant' || m.role === 'summary') &&
        (m.content?.trim() || (m.role === 'assistant' && m.contentBlocks?.some((b) => b.type === 'tool')))
    )

    let summaryMsg: AIMessage | undefined
    for (let i = validMessages.length - 1; i >= 0; i--) {
      if (validMessages[i].role === 'summary') {
        summaryMsg = validMessages[i]
        break
      }
    }

    let result: Array<{ role: 'user' | 'assistant' | 'summary'; content: string; contentBlocks?: ContentBlock[] }>

    if (summaryMsg) {
      const metaBlock = summaryMsg.contentBlocks?.find(
        (b): b is Extract<ContentBlock, { type: 'summary_meta' }> => b.type === 'summary_meta'
      )
      const bufferBoundary = metaBlock?.bufferBoundaryTimestamp

      if (!metaBlock) {
        this.logger.warn('AIChats', 'summary message missing summary_meta; agent context will be summary-only', {
          aiChatId,
          messageId: summaryMsg.id,
        })
      }

      const contextMessages = bufferBoundary
        ? validMessages.filter((m) => m.role !== 'summary' && m.timestamp >= bufferBoundary)
        : []

      result = [
        { role: 'summary' as const, content: summaryMsg.content },
        ...contextMessages.map((m) => ({ role: m.role, content: m.content, contentBlocks: m.contentBlocks })),
      ]
    } else {
      result = validMessages.map((m) => ({ role: m.role, content: m.content, contentBlocks: m.contentBlocks }))
    }

    if (maxMessages && result.length > maxMessages) {
      if (result.length > 0 && result[0].role === 'summary') {
        const rest = result.slice(1)
        const truncated = rest.slice(-(maxMessages - 1))
        return [result[0], ...truncated]
      }
      return result.slice(-maxMessages)
    }
    return result
  }