Heartbeat

Run the agent's periodic checks. Triggered every 30 minutes by a local cron, or manually.

How it works

1. Cron health (ALWAYS — even outside active hours). This is infrastructure, not a user-facing check; it is what heals orphaned reminders in long-running sessions (see issue #32). This step manages its own state: it reads AND writes the cronAudit field of memory/heartbeat-state.json itself, here, regardless of whether the later steps run. Every heartbeat:
   • Load the tools once per session if needed: ToolSearch(query="select:CronList,CronCreate").
   • Retire fired one-shots FIRST so the repair below cannot resurrect them: bash "$CLAUDE_PLUGIN_ROOT/skills/crons/writeback.sh" prune-expired
   • Call CronList and pipe its FULL output to: bash "$CLAUDE_PLUGIN_ROOT/skills/crons/writeback.sh" audit (mechanical diff: refreshes lastSeenAlive, relinks survivors, prints orphan key=… / blocked key=… lines and an audit: alive=K/N … summary; exit 4 = format drift — stop, surface it, do not create anything).
   • If orphaned=0 and blocked=0: clear cronAudit.pending in memory/heartbeat-state.json if set — done, say nothing.
   • If orphaned>0: repair orphan key= lines ONLY (NEVER blocked key= lines — those have ambiguous live duplicates; recreating them would add a third copy). touch "$CLAUDE_PROJECT_DIR/memory/.reconciling" (the registry's crons are replayed verbatim, so the cron-from.sh stamp gate must be bypassed), then for each orphan key: CronCreate with that entry's cron/prompt/recurring from memory/crons.json + writeback.sh set-alive --key <key> --harness-task-id <new id>; continue past individual failures. Then rm -f "$CLAUDE_PROJECT_DIR/memory/.reconciling" immediately and re-run CronList → audit.
   • Notification throttle: write the keys still orphaned-after-repair or blocked into cronAudit.pending (with a timestamp) in memory/heartbeat-state.json. Notify the user ONLY when the same key(s) were already in cronAudit.pending from the previous beat — one notice (orphans: "couldn't re-create X, run /agent:crons reconcile"; blocked: "X has duplicate live reminders, review with /agent:crons list"), then record it as notified so it doesn't repeat every beat.
2. Check active hours — read agent-config.json for heartbeat.activeHours. If outside the window, skip the remaining steps silently (the cron-health step above already ran).
3. Load state — read memory/heartbeat-state.json (if exists) to know when each check last ran. Avoid repeating checks done less than 30 min ago.
4. Read HEARTBEAT.md — this is the checklist. Follow it strictly. Do not infer or repeat old tasks from prior conversations. If nothing in the checklist needs attention, skip to step 7.
5. Execute checks — rotate through the items in HEARTBEAT.md, doing 2-4 per heartbeat (not all every time). For each:
   • Memory consolidation: review last 3 daily logs → distill insights → update MEMORY.md
   • Dream review: dream(action='status') → note high-recall items not yet promoted
   • Custom checks: whatever the user added to HEARTBEAT.md (emails, health, projects, etc.)
6. Proactive work (do without asking):
   • Organize memory files
   • Remove outdated entries from MEMORY.md
   • Check IMPORT_BACKLOG.md if it exists — remind user about pending items
   • Verify installed skills are accessible
7. Update state — write memory/heartbeat-state.json with timestamps for each check performed.
8. Notify or stay quiet:
   • If something needs the user's attention → notify (via reply tool if on a messaging channel, or print if CLI)
   • If nothing noteworthy → do nothing. No "heartbeat completed" messages.

Self-managing the checklist

The agent should edit HEARTBEAT.md during normal conversations when something needs periodic attention:

• User says "revísame los emails cada rato" → agent adds - **Email inbox** — check for urgent unread to HEARTBEAT.md
• User installs a new skill with periodic needs → agent adds a check for it
• A reminder is due daily → agent adds it to HEARTBEAT.md instead of creating a separate cron
• When a check is no longer needed → agent removes it from HEARTBEAT.md

Rule: batch similar checks into HEARTBEAT.md instead of creating multiple cron jobs. Heartbeats are cheaper (one turn, multiple checks) than separate crons (one turn each).

Active hours

{
  "heartbeat": {
    "activeHours": {
      "start": "08:00",
      "end": "23:00",
      "timezone": "America/Santiago"
    }
  }
}

Outside this window, heartbeats skip silently. Configure via /agent:settings.

Scheduling

Created automatically on first session (SessionStart hook):

• Default: */30 * * * * (every 30 minutes)
• Only fires while Claude Code is open and REPL is idle
• For 24/7 heartbeats, use /agent:service install