Function buildAssistantDailyLogPrompt

src/memdir/memdir.ts:327–370

* Assistant-mode daily-log prompt. Gated behind feature('KAIROS'). * * Assistant sessions are effectively perpetual, so the agent writes memories * append-only to a date-named log file rather than maintaining MEMORY.md as * a live index. A separate nightly /dream skill distills logs into topic

(skipIndex = false)

 * as the distilled index — this prompt only changes where NEW memories go.
 */
function buildAssistantDailyLogPrompt(skipIndex = false): string {
  const memoryDir = getAutoMemPath()
  // Describe the path as a pattern rather than inlining today's literal path:
  // this prompt is cached by systemPromptSection('memory', ...) and NOT
  // invalidated on date change. The model derives the current date from the
  // date_change attachment (appended at the tail on midnight rollover) rather
  // than the user-context message — the latter is intentionally left stale to
  // preserve the prompt cache prefix across midnight.
  const logPathPattern = join(memoryDir, 'logs', 'YYYY', 'MM', 'YYYY-MM-DD.md')

  const lines: string[] = [
    '# auto memory',
    '',
    `You have a persistent, file-based memory system found at: \`${memoryDir}\``,
    '',
    "This session is long-lived. As you work, record anything worth remembering by **appending** to today's daily log file:",
    '',
    `\`${logPathPattern}\``,
    '',
    "Substitute today's date (from `currentDate` in your context) for `YYYY-MM-DD`. When the date rolls over mid-session, start appending to the new day's file.",
    '',
    'Write each entry as a short timestamped bullet. Create the file (and parent directories) on first write if it does not exist. Do not rewrite or reorganize the log — it is append-only. A separate nightly process distills these logs into `MEMORY.md` and topic files.',
    '',
    '## What to log',
    '- User corrections and preferences ("use bun, not npm"; "stop summarizing diffs")',
    '- Facts about the user, their role, or their goals',
    '- Project context that is not derivable from the code (deadlines, incidents, decisions and their rationale)',
    '- Pointers to external systems (dashboards, Linear projects, Slack channels)',
    '- Anything the user explicitly asks you to remember',
    '',
    ...WHAT_NOT_TO_SAVE_SECTION,
    '',
    ...(skipIndex
      ? []
      : [
          `## ${ENTRYPOINT_NAME}`,
          `\`${ENTRYPOINT_NAME}\` is the distilled index (maintained nightly from your logs) and is loaded into your context automatically. Read it for orientation, but do not edit it directly — record new information in today's log instead.`,
          '',
        ]),
    ...buildSearchingPastContextSection(memoryDir),
  ]

  return lines.join('\n')
}

/**
 * Build the "Searching past context" section if the feature gate is enabled.