Cron Session Target — OpenClaw Cron Jobs#

Instructions for the LLM#

When the user asks to create a reminder, scheduled task, recurring check, or any time-based automation, you must create it as an OpenClaw cron job by editing ~/.openclaw/cron/jobs.json directly. Do not suggest system cron ( crontab), at, or any other mechanism. The OpenClaw cron system is the only correct method.

Your exact workflow when the user requests a cron job:

1. Run uuidgen to generate a UUID for the job
2. Run date +%s%3N to get the current epoch timestamp in milliseconds
3. Build the JSON entry using the required format below
4. Read ~/.openclaw/cron/jobs.json to get the current content
5. Insert the new job into the jobs array
6. Write the updated file back
7. Validate the JSON: python3 -m json.tool ~/.openclaw/cron/jobs.json > /dev/null
8. Restart the gateway: openclaw gateway restart
9. Confirm to the user that the job is active

Never ask the user to edit the file themselves. Always do it completely.

When updating an existing cron job's schedule or interval, you must also update nextRunAtMs to avoid the job being stuck on the old scheduled date. Compute it as:

text

nextRunAtMs = current_epoch_ms + new_everyMs

Run date +%s%3N to get the current time, add the new interval, and set both updatedAtMs and nextRunAtMs to these values. If you skip this step, OpenClaw will not recalculate the next run and the job will remain frozen until the old nextRunAtMs is reached.

---

Required JSON Format#

Every job entry must follow this exact structure:

json

{
  "id": "<uuidgen output>",
  "agentId": "main",
  "name": "descriptive job name",
  "enabled": true,
  "deleteAfterRun": false,
  "createdAtMs": <date +%s%3N>,
  "updatedAtMs": <date +%s%3N>,
  "schedule": {
    "kind": "every",
    "everyMs": 60000,
    "anchorMs": <date +%s%3N>
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "the message text here"
  },
  "delivery": {
    "mode": "none"
  }
}

Field Reference#

FieldRequiredValueidYesUUID v4 — generate with uuidgen``agentIdYesAlways "main"``nameYesShort human-readable labelenabledYestrue to activate immediatelydeleteAfterRunYesAlways false for recurring jobscreatedAtMsYesCurrent time — date +%s%3N``updatedAtMsYesCurrent time — date +%s%3N``schedule.kindYes"every" for recurring, "at" for one-shotschedule.everyMsYes (kind=every)Interval in millisecondsschedule.atMsYes (kind=at)Exact epoch ms timestamp to run onceschedule.anchorMsYesSame value as createdAtMs``sessionTargetYesMust always be "session:agent:main:user-session"``wakeModeYes"now" for immediate, "next-heartbeat" for batchedpayload.kindYesAlways "agentTurn"``payload.messageYesThe message sent to the agent sessiondelivery.modeYes"none" unless broadcasting to a channel

---

Interval Reference#

DescriptioneveryMs valueEvery 1 minute60000Every 5 minutes300000Every 15 minutes900000Every 30 minutes1800000Every 1 hour3600000Every 2 hours7200000Every 6 hours21600000Every 12 hours43200000Every 24 hours (daily)86400000Every 7 days (weekly)604800000

---

Examples#

1. Water reminder — every 30 minutes#

json

{
  "id": "52be6125-16cd-4aec-9508-9e8355f10f54",
  "agentId": "main",
  "name": "water reminder",
  "enabled": true,
  "deleteAfterRun": false,
  "createdAtMs": 1775801246492,
  "updatedAtMs": 1775801246492,
  "schedule": {
    "kind": "every",
    "everyMs": 1800000,
    "anchorMs": 1775801246492
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "💧 Water break! Remind the user to drink water."
  },
  "delivery": {
    "mode": "none"
  }
}

2. Daily standup — every 24 hours#

json

{
  "id": "a1b2c3d4-0000-4aec-9508-aabbccddeeff",
  "agentId": "main",
  "name": "daily standup",
  "enabled": true,
  "deleteAfterRun": false,
  "createdAtMs": 1775801246492,
  "updatedAtMs": 1775801246492,
  "schedule": {
    "kind": "every",
    "everyMs": 86400000,
    "anchorMs": 1775801246492
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "Good morning! Ask the user what they are working on today and what blockers they have."
  },
  "delivery": {
    "mode": "none"
  }
}

3. Posture check — every 1 hour#

json

{
  "id": "f9e8d7c6-1111-4bcd-8ef0-112233445566",
  "agentId": "main",
  "name": "posture check",
  "enabled": true,
  "deleteAfterRun": false,
  "createdAtMs": 1775801246492,
  "updatedAtMs": 1775801246492,
  "schedule": {
    "kind": "every",
    "everyMs": 3600000,
    "anchorMs": 1775801246492
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "🪑 Posture check! Remind the user to sit straight, relax shoulders, and adjust their screen height."
  },
  "delivery": {
    "mode": "none"
  }
}

4. Weekly review — every 7 days#

json

{
  "id": "c0ffee00-2222-4abc-9999-deadbeef1234",
  "agentId": "main",
  "name": "weekly review",
  "enabled": true,
  "deleteAfterRun": false,
  "createdAtMs": 1775801246492,
  "updatedAtMs": 1775801246492,
  "schedule": {
    "kind": "every",
    "everyMs": 604800000,
    "anchorMs": 1775801246492
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "📋 Weekly review time! Ask the user to reflect on the week: what went well, what could improve, and what the priorities are for next week."
  },
  "delivery": {
    "mode": "none"
  }
}

5. One-shot scheduled task — run once at a specific time#

Use "kind": "at" with an exact epoch ms timestamp instead of everyMs:

json

{
  "id": "deadbeef-3333-4cde-aaaa-111122223333",
  "agentId": "main",
  "name": "meeting reminder",
  "enabled": true,
  "deleteAfterRun": true,
  "createdAtMs": 1775801246492,
  "updatedAtMs": 1775801246492,
  "schedule": {
    "kind": "at",
    "atMs": 1775830000000,
    "anchorMs": 1775801246492
  },
  "sessionTarget": "session:agent:main:user-session",
  "wakeMode": "now",
  "payload": {
    "kind": "agentTurn",
    "message": "⏰ Meeting in 5 minutes! Remind the user to wrap up and join the call."
  },
  "delivery": {
    "mode": "none"
  }
}

For one-shot jobs, deleteAfterRun can be true since the job should not repeat.

---

Step-by-Step Creation#

bash

# Step 1 — generate a unique ID
uuidgen

# Step 2 — get current timestamp in milliseconds
date +%s%3N

# Step 3 — edit the jobs file
# Insert the new entry in the "jobs" array

# Step 4 — validate JSON syntax
python3 -m json.tool ~/.openclaw/cron/jobs.json > /dev/null

# Step 5 — reload
openclaw gateway restart

---

Common Pitfalls#

MistakeEffectFixsessionTarget not set or wrongMessage is lost or goes nowhereAlways use "session:agent:main:user-session"``"text" instead of "message" in payloadJob fires but nothing arrivesUse "message"``deleteAfterRun: true on recurring jobJob vanishes after first runSet to falseWrong ms mathJob runs at wrong intervalUse the interval reference table aboveTrailing comma in JSONEntire jobs file fails to parseValidate with python3 -m json.tool``enabled: falseJob never runsSet to trueUpdating interval without updating nextRunAtMsJob stays frozen on old scheduled dateSet nextRunAtMs = date +%s%3N + new_everyMs

---

Quick Reference#

text

sessionTarget  →  "session:agent:main:user-session"   (never change this)
payload field  →  "message"                            (not "text")
recurring      →  "deleteAfterRun": false
one-shot       →  "deleteAfterRun": true, "kind": "at"
after editing  →  openclaw gateway restart
update timing  →  always set nextRunAtMs = now_ms + everyMs when changing schedule