1  import { feature } from 'bun:bundle'
  2  import { getFeatureValue_CACHED_WITH_REFRESH } from '../../services/analytics/growthbook.js'
  3  import { DEFAULT_CRON_JITTER_CONFIG } from '../../utils/cronTasks.js'
  4  import { isEnvTruthy } from '../../utils/envUtils.js'
  5  
  6  const KAIROS_CRON_REFRESH_MS = 5 * 60 * 1000
  7  
  8  export const DEFAULT_MAX_AGE_DAYS =
  9    DEFAULT_CRON_JITTER_CONFIG.recurringMaxAgeMs / (24 * 60 * 60 * 1000)
 10  
 11  /**
 12   * Unified gate for the cron scheduling system. Combines the build-time
 13   * `feature('AGENT_TRIGGERS')` flag (dead code elimination) with the runtime
 14   * `tengu_kairos_cron` GrowthBook gate on a 5-minute refresh window.
 15   *
 16   * AGENT_TRIGGERS is independently shippable from KAIROS — the cron module
 17   * graph (cronScheduler/cronTasks/cronTasksLock/cron.ts + the three tools +
 18   * /loop skill) has zero imports into src/assistant/ and no feature('KAIROS')
 19   * calls. The REPL.tsx kairosEnabled read is safe:
 20   * kairosEnabled is unconditionally in AppStateStore with default false, so
 21   * when KAIROS is off the scheduler just gets assistantMode: false.
 22   *
 23   * Called from Tool.isEnabled() (lazy, post-init) and inside useEffect /
 24   * imperative setup, never at module scope — so the disk cache has had a
 25   * chance to populate.
 26   *
 27   * The default is `true` — /loop is GA (announced in changelog). GrowthBook
 28   * is disabled for Bedrock/Vertex/Foundry and when DISABLE_TELEMETRY /
 29   * CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC are set; a `false` default would
 30   * break /loop for those users (GH #31759). The GB gate now serves purely as
 31   * a fleet-wide kill switch — flipping it to `false` stops already-running
 32   * schedulers on their next isKilled poll tick, not just new ones.
 33   *
 34   * `CLAUDE_CODE_DISABLE_CRON` is a local override that wins over GB.
 35   */
 36  export function isKairosCronEnabled(): boolean {
 37    return feature('AGENT_TRIGGERS')
 38      ? !isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_CRON) &&
 39          getFeatureValue_CACHED_WITH_REFRESH(
 40            'tengu_kairos_cron',
 41            true,
 42            KAIROS_CRON_REFRESH_MS,
 43          )
 44      : false
 45  }
 46  
 47  /**
 48   * Kill switch for disk-persistent (durable) cron tasks. Narrower than
 49   * {@link isKairosCronEnabled} — flipping this off forces `durable: false` at
 50   * the call() site, leaving session-only cron (in-memory, GA) untouched.
 51   *
 52   * Defaults to `true` so Bedrock/Vertex/Foundry and DISABLE_TELEMETRY users get
 53   * durable cron. Does NOT consult CLAUDE_CODE_DISABLE_CRON (that kills the whole
 54   * scheduler via isKairosCronEnabled).
 55   */
 56  export function isDurableCronEnabled(): boolean {
 57    return getFeatureValue_CACHED_WITH_REFRESH(
 58      'tengu_kairos_cron_durable',
 59      true,
 60      KAIROS_CRON_REFRESH_MS,
 61    )
 62  }
 63  
 64  export const CRON_CREATE_TOOL_NAME = 'CronCreate'
 65  export const CRON_DELETE_TOOL_NAME = 'CronDelete'
 66  export const CRON_LIST_TOOL_NAME = 'CronList'
 67  
 68  export function buildCronCreateDescription(durableEnabled: boolean): string {
 69    return durableEnabled
 70      ? 'Schedule a prompt to run at a future time — either recurring on a cron schedule, or once at a specific time. Pass durable: true to persist to .claude/scheduled_tasks.json; otherwise session-only.'
 71      : 'Schedule a prompt to run at a future time within this Claude session — either recurring on a cron schedule, or once at a specific time.'
 72  }
 73  
 74  export function buildCronCreatePrompt(durableEnabled: boolean): string {
 75    const durabilitySection = durableEnabled
 76      ? `## Durability
 77  
 78  By default (durable: false) the job lives only in this Claude session — nothing is written to disk, and the job is gone when Claude exits. Pass durable: true to write to .claude/scheduled_tasks.json so the job survives restarts. Only use durable: true when the user explicitly asks for the task to persist ("keep doing this every day", "set this up permanently"). Most "remind me in 5 minutes" / "check back in an hour" requests should stay session-only.`
 79      : `## Session-only
 80  
 81  Jobs live only in this Claude session — nothing is written to disk, and the job is gone when Claude exits.`
 82  
 83    const durableRuntimeNote = durableEnabled
 84      ? 'Durable jobs persist to .claude/scheduled_tasks.json and survive session restarts — on next launch they resume automatically. One-shot durable tasks that were missed while the REPL was closed are surfaced for catch-up. Session-only jobs die with the process. '
 85      : ''
 86  
 87    return `Schedule a prompt to be enqueued at a future time. Use for both recurring schedules and one-shot reminders.
 88  
 89  Uses standard 5-field cron in the user's local timezone: minute hour day-of-month month day-of-week. "0 9 * * *" means 9am local — no timezone conversion needed.
 90  
 91  ## One-shot tasks (recurring: false)
 92  
 93  For "remind me at X" or "at <time>, do Y" requests — fire once then auto-delete.
 94  Pin minute/hour/day-of-month/month to specific values:
 95    "remind me at 2:30pm today to check the deploy" → cron: "30 14 <today_dom> <today_month> *", recurring: false
 96    "tomorrow morning, run the smoke test" → cron: "57 8 <tomorrow_dom> <tomorrow_month> *", recurring: false
 97  
 98  ## Recurring jobs (recurring: true, the default)
 99  
100  For "every N minutes" / "every hour" / "weekdays at 9am" requests:
101    "*/5 * * * *" (every 5 min), "0 * * * *" (hourly), "0 9 * * 1-5" (weekdays at 9am local)
102  
103  ## Avoid the :00 and :30 minute marks when the task allows it
104  
105  Every user who asks for "9am" gets \`0 9\`, and every user who asks for "hourly" gets \`0 *\` — which means requests from across the planet land on the API at the same instant. When the user's request is approximate, pick a minute that is NOT 0 or 30:
106    "every morning around 9" → "57 8 * * *" or "3 9 * * *" (not "0 9 * * *")
107    "hourly" → "7 * * * *" (not "0 * * * *")
108    "in an hour or so, remind me to..." → pick whatever minute you land on, don't round
109  
110  Only use minute 0 or 30 when the user names that exact time and clearly means it ("at 9:00 sharp", "at half past", coordinating with a meeting). When in doubt, nudge a few minutes early or late — the user will not notice, and the fleet will.
111  
112  ${durabilitySection}
113  
114  ## Runtime behavior
115  
116  Jobs only fire while the REPL is idle (not mid-query). ${durableRuntimeNote}The scheduler adds a small deterministic jitter on top of whatever you pick: recurring tasks fire up to 10% of their period late (max 15 min); one-shot tasks landing on :00 or :30 fire up to 90 s early. Picking an off-minute is still the bigger lever.
117  
118  Recurring tasks auto-expire after ${DEFAULT_MAX_AGE_DAYS} days — they fire one final time, then are deleted. This bounds session lifetime. Tell the user about the ${DEFAULT_MAX_AGE_DAYS}-day limit when scheduling recurring jobs.
119  
120  Returns a job ID you can pass to ${CRON_DELETE_TOOL_NAME}.`
121  }
122  
123  export const CRON_DELETE_DESCRIPTION = 'Cancel a scheduled cron job by ID'
124  export function buildCronDeletePrompt(durableEnabled: boolean): string {
125    return durableEnabled
126      ? `Cancel a cron job previously scheduled with ${CRON_CREATE_TOOL_NAME}. Removes it from .claude/scheduled_tasks.json (durable jobs) or the in-memory session store (session-only jobs).`
127      : `Cancel a cron job previously scheduled with ${CRON_CREATE_TOOL_NAME}. Removes it from the in-memory session store.`
128  }
129  
130  export const CRON_LIST_DESCRIPTION = 'List scheduled cron jobs'
131  export function buildCronListPrompt(durableEnabled: boolean): string {
132    return durableEnabled
133      ? `List all cron jobs scheduled via ${CRON_CREATE_TOOL_NAME}, both durable (.claude/scheduled_tasks.json) and session-only.`
134      : `List all cron jobs scheduled via ${CRON_CREATE_TOOL_NAME} in this session.`
135  }