Function filterOrphanedThinkingOnlyMessages

src/utils/messages.ts:4997–5058

(
  messages: Message[],
)

  messages: Message[],
): Message[]
export function filterOrphanedThinkingOnlyMessages(
  messages: Message[],
): Message[] {
  // First pass: collect message.ids that have non-thinking content
  // These will be merged later in normalizeMessagesForAPI()
  const messageIdsWithNonThinkingContent = new Set<string>()
  for (const msg of messages) {
    if (msg.type !== 'assistant') continue

    const content = msg.message.content
    if (!Array.isArray(content)) continue

    const hasNonThinking = content.some(
      block => block.type !== 'thinking' && block.type !== 'redacted_thinking',
    )
    if (hasNonThinking && msg.message.id) {
      messageIdsWithNonThinkingContent.add(msg.message.id)
    }
  }

  // Second pass: filter out thinking-only messages that are truly orphaned
  const filtered = messages.filter(msg => {
    if (msg.type !== 'assistant') {
      return true
    }

    const content = msg.message.content
    if (!Array.isArray(content) || content.length === 0) {
      return true
    }

    // Check if ALL content blocks are thinking blocks
    const allThinking = content.every(
      block => block.type === 'thinking' || block.type === 'redacted_thinking',
    )

    if (!allThinking) {
      return true // Has non-thinking content, keep it
    }

    // It's thinking-only. Keep it if there's another message with same id
    // that has non-thinking content (they'll be merged later)
    if (
      msg.message.id &&
      messageIdsWithNonThinkingContent.has(msg.message.id)
    ) {
      return true
    }

    // Truly orphaned - no other message with same id has content to merge with
    logEvent('tengu_filtered_orphaned_thinking_message', {
      messageUUID:
        msg.uuid as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      messageId: msg.message
        .id as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      blockCount: content.length,
    })
    return false