Function buildMemoryPrompt

src/memdir/memdir.ts:272–316

(params: {
  displayName: string
  memoryDir: string
  extraGuidelines?: string[]
})

 * Used by agent memory (which has no getClaudeMds() equivalent).
 */
export function buildMemoryPrompt(params: {
  displayName: string
  memoryDir: string
  extraGuidelines?: string[]
}): string {
  const { displayName, memoryDir, extraGuidelines } = params
  const fs = getFsImplementation()
  const entrypoint = memoryDir + ENTRYPOINT_NAME

  // Directory creation is the caller's responsibility (loadMemoryPrompt /
  // loadAgentMemoryPrompt). Builders only read, they don't mkdir.

  // Read existing memory entrypoint (sync: prompt building is synchronous)
  let entrypointContent = ''
  try {
    // eslint-disable-next-line custom-rules/no-sync-fs
    entrypointContent = fs.readFileSync(entrypoint, { encoding: 'utf-8' })
  } catch {
    // No memory file yet
  }

  const lines = buildMemoryLines(displayName, memoryDir, extraGuidelines)

  if (entrypointContent.trim()) {
    const t = truncateEntrypointContent(entrypointContent)
    const memoryType = displayName === AUTO_MEM_DISPLAY_NAME ? 'auto' : 'agent'
    logMemoryDirCounts(memoryDir, {
      content_length: t.byteCount,
      line_count: t.lineCount,
      was_truncated: t.wasLineTruncated,
      was_byte_truncated: t.wasByteTruncated,
      memory_type:
        memoryType as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    })
    lines.push(`## ${ENTRYPOINT_NAME}`, '', t.content)
  } else {
    lines.push(
      `## ${ENTRYPOINT_NAME}`,
      '',
      `Your ${ENTRYPOINT_NAME} is currently empty. When you save new memories, they will appear here.`,
    )
  }

  return lines.join('\n')
}

/**
 * Assistant-mode daily-log prompt. Gated behind feature('KAIROS').