2026-05-21 OpenClaw cron isolated sessions, per-job webhook delivery, and gateway restart stagger on a headless leased Apple Silicon cloud Mac (HK / JP / KR / SG / US)

Teams that rent Mac mini M4 builders in Hong Kong, Tokyo, Seoul, Singapore, or the United States and run OpenClaw headlessly often graduate from reactive chat to scheduled automation—nightly repo digests, standup summaries, certificate-expiry scans, and CI failure triage pushed to Slack or an internal webhook. OpenClaw’s built-in cron runs inside the gateway process, persists jobs to ~/.openclaw/cron/jobs.json, and can wake agents in isolated sessions or on the main session heartbeat. This 2026-05-21 guide states the policy up front: use isolated cron for tool-heavy background work, keep main-session cron for lightweight reminders, stagger schedules by at least 2–5 minutes, and configure per-job webhook POST only with TLS and shared secrets—never bare HTTP on a shared lease. You get a session decision matrix, a schedule + webhook table, gateway restart stagger notes, an eight-step rollout, and triage aligned with onboard + doctor, launchd cron baseline, and MCP tool policy.

Who needs OpenClaw gateway cron on a leased headless Mac

macOS launchd alone can fire shell scripts, but it cannot reason about agent context, model routing, or channel delivery. OpenClaw cron closes that gap: schedules live with the gateway, survive restarts when jobs.json is intact, and route output to chat channels or HTTP endpoints. On a leased host the failure mode is operational—five jobs created at the same minute after a deploy, an overdue backlog firing together when the gateway returns, or a webhook pointed at staging that mutates production tickets.

• Platform SREs want digest jobs that POST JSON to an internal collector without keeping a second scheduler VM online.
• Engineering managers need standup-ready summaries from ripgrep + issue trackers on a Tokyo or Singapore node close to APAC repos.
• Security leads require isolated sessions so a cron prompt cannot inherit a human’s main-session tool approvals.

Start from the MacXCode home regional map: place the gateway where webhook RTT to your VPC is lowest, then document which jobs may call write tools versus read-only summaries.

Isolated vs main-session vs named cron targets

OpenClaw cron can target different execution contexts. Isolated sessions spin a dedicated cron agent turn—ideal for reports that call file tools, MCP, or shell wrappers. Main session jobs piggyback on the next heartbeat turn—best for lightweight reminders that should not fork a heavy toolchain. Named custom sessions suit workflows that accumulate history across runs (weekly ops diaries). Picking the wrong target produces either silent no-ops (isolated dispatch bugs in some releases) or polluted human chat threads.

Target	Best for	Avoid when	Lease note
Isolated session	Nightly digests, MCP-heavy scans	You need instant chat replies in the same thread	Cap at 2 concurrent isolated runs on one M4
Main session + heartbeat	Reminders, calendar nudges	Job shells out to xcodebuild or large ripgrep	Keep prompts under 2k tokens input
Named persistent session	Multi-week ops journals	Compliance requires ephemeral context	Snapshot OPENCLAW_STATE_DIR weekly

Schedule types, webhooks, and delivery matrix

Gateway cron accepts three schedule shapes: --at (one-shot ISO or relative like 20m), --every (fixed interval), and --cron (5- or 6-field expression with optional IANA timezone). One-shot jobs typically auto-delete after success—verify that flag before relying on audit trails. Per-job webhook delivery (2026.2.x+) POSTs run summaries to HTTPS endpoints; pair with the same TLS and HMAC patterns you use for inbound OpenClaw webhooks.

Schedule	Example	Delivery	Headless checklist
--cron + TZ	0 9 * * 1-5 Asia/Tokyo	Slack + webhook	Confirm gateway system TZ vs job TZ
--every	4h health digest	Webhook only	Idempotent handler; include runId
--at	Post-deploy smoke in 45m	Isolated session	Log exit code to launchd paths

Gateway restart, overdue jobs, and jobs.json hygiene

Cron runs inside the gateway—not inside the model—so every launchctl kickstart -k is also a scheduler restart. When the host was down, overdue isolated jobs may enqueue together; upstream builds now stagger missed runs to avoid gateway stalls, but you should still treat restart windows as incident-prone. Before upgrades, copy ~/.openclaw/cron/jobs.json and the surrounding state tree per session checkpoint guidance. After restart, tail gateway logs for a burst of cron task IDs within the same second—that pattern precedes 429 storms.

Pair cron with openclaw doctor after npm bumps; stale modules break scheduling silently more often than they break chat. If isolated jobs enqueue but never dispatch, temporarily route to main-session reminders, file an upstream ticket, and disable write-capable tools until vendor fixes land—do not leave silent schedules on production leases.

Eight-step rollout for OpenClaw cron on leased Apple Silicon

1. Confirm gateway health: openclaw doctor and launchctl print gui/$(id -u)/com.openclaw.gateway (label may vary).
2. Backup ~/.openclaw/cron/jobs.json and OPENCLAW_STATE_DIR before the first schedule change.
3. Create one isolated read-only digest job with --cron offset from the hour (e.g. 7 past).
4. Add HTTPS webhook delivery with HMAC header; verify 2xx from a staging endpoint first.
5. Run a one-shot --at 15m smoke job; confirm auto-delete behavior matches your audit needs.
6. Restart gateway once during a maintenance window; verify staggered overdue execution in logs.
7. Document kill-switch: disable job entries, launchctl kickstart -k gateway, confirm webhooks stop.
8. Review token telemetry per run after seven days; right-size model tier or split to a second lease host.

Example stagger-friendly cron (Tokyo business mornings, isolated):

openclaw cron add --cron "12 9 * * 1-5" --tz Asia/Tokyo --session isolated --message "Summarize overnight CI failures; read-only tools." --webhook https://hooks.internal.example/ci-digest

Triage playbook when cron misfires on a headless lease

Symptom	Likely cause	Next command or fix
Job never fires	Gateway down or TZ mismatch	Check launchd; compare --tz with date on host
Many fires at gateway start	Overdue backlog	Stagger schedules; upgrade gateway; watch stagger logs
Webhook 401/403	Rotated secret not in plist	Update env vars; kickstart gateway
Isolated enqueue, no output	Dispatch regression	Temporarily use main session; see doctor + upstream issues

FAQ

Where does OpenClaw store cron jobs? In ~/.openclaw/cron/jobs.json under the gateway user—back it up before upgrades.

Isolated or main session for nightly reports? Isolated for tool-heavy work; main+heartbeat only for lightweight nudges.

Why did cron flood after restart? Overdue jobs caught up together—offset schedules and ensure your build includes startup stagger.

Bookmark the blog index and help center for SSH access before you automate production webhooks.

Why Mac mini M4 leases fit OpenClaw cron + webhooks

Apple Silicon M4 keeps gateway + two isolated cron runs inside predictable unified memory budgets—unlike bursty x86 VMs that swap during ripgrep. Leasing in Hong Kong or Tokyo lowers webhook RTT to APAC endpoints; US nodes suit US-daytime schedules. You add always-on automation without buying a second desk Mac, and you can shard heavy jobs to a second lease when token telemetry says so. Compare regions on pricing, rehearse gateway installs in the help center, and use VNC only when a cron task must debug GUI-only tools.