Function cachedMicrocompactPath

src/services/compact/microCompact.ts:309–403

* Cached microcompact path - uses cache editing API to remove tool results * without invalidating the cached prefix. * * Key differences from regular microcompact: * - Does NOT modify local message content (cache_reference and cache_edits are added at API layer) * - Uses count-based trigger/kee

(
  messages: Message[],
  querySource: QuerySource | undefined,
)

 * - Tracks tool results and queues cache edits for the API layer
 */
async function cachedMicrocompactPath(
  messages: Message[],
  querySource: QuerySource | undefined,
): Promise<MicrocompactResult> {
  const mod = await getCachedMCModule()
  const state = ensureCachedMCState()
  const config = mod.getCachedMCConfig()

  const compactableToolIds = new Set(collectCompactableToolIds(messages))
  // Second pass: register tool results grouped by user message
  for (const message of messages) {
    if (message.type === 'user' && Array.isArray(message.message!.content)) {
      const groupIds: string[] = []
      for (const block of message.message!.content) {
        if (
          block.type === 'tool_result' &&
          compactableToolIds.has(block.tool_use_id) &&
          !state.registeredTools.has(block.tool_use_id)
        ) {
          mod.registerToolResult(state, block.tool_use_id)
          groupIds.push(block.tool_use_id)
        }
      }
      mod.registerToolMessage(state, groupIds)
    }
  }

  const toolsToDelete = mod.getToolResultsToDelete(state)

  if (toolsToDelete.length > 0) {
    // Create and queue the cache_edits block for the API layer
    const cacheEdits = mod.createCacheEditsBlock(state, toolsToDelete)
    if (cacheEdits) {
      pendingCacheEdits = cacheEdits
    }

    logForDebugging(
      `Cached MC deleting ${toolsToDelete.length} tool(s): ${toolsToDelete.join(', ')}`,
    )

    // Log the event
    logEvent('tengu_cached_microcompact', {
      toolsDeleted: toolsToDelete.length,
      deletedToolIds: toolsToDelete.join(
        ',',
      ) as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      activeToolCount: state.toolOrder.length - state.deletedRefs.size,
      triggerType:
        'auto' as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      threshold: config.triggerThreshold,
      keepRecent: config.keepRecent,
    })

    // Suppress warning after successful compaction
    suppressCompactWarning()

    // Notify cache break detection that cache reads will legitimately drop
    if (feature('PROMPT_CACHE_BREAK_DETECTION')) {