Arcanum Engine integration
How Hollow Sentinel and Arcanum Engine work together — watch versus act.
Hollow Sentinel watches your store and tells you what changed. Arcanum Engine installs commerce systems and playbooks that act on those signals. Together they form a watch-and-act loop without duplicating dashboards.
Product roles
| Hollow Sentinel | Arcanum Engine |
|---|---|
| Passive monitoring and baselines | Active automations and directional impact tracking |
| Daily briefing and health scores | Operating score weighted by installed systems |
| Insights and revenue at risk | Playbook installs and Slack execution alerts |
| Store timeline and memory | Commerce systems and industry packs |
| Named low-stock SKU lists in briefing and insights | Ongoing low-stock alerts via Inventory Guardian playbook |
Recommendation bridge (GUARD)
When both apps are installed on the same store, Sentinel syncs open insights to Engine as GUARD recommendations — no separate Sentinel Growth requirement for sync. Engine's Command center shows Detected by Sentinel on matching opportunities. Install links include `prefill=1` and `source=sentinel` so the Engine wizard opens with safe defaults from the insight (thresholds and severity) for you to confirm before activate. Decision queue cards and Insights show Install in Engine when the insight type maps to a playbook. Sentinel never silent-auto-activates playbooks — you confirm in Engine.
Insight to playbook mapping
| Sentinel signal | Recommended Engine playbook |
|---|---|
| Revenue drop, marketing anomaly, theme deployment, app install, discount leakage, checkout funnel, campaign quiet, Lens finding | Revenue Watch |
| Inventory risk, stockout imminent, stockout forecast | Inventory Guardian |
| Conversion change, Klaviyo flow drop, Engine event gap | Winback Engine |
| Flow failure (subscription) | Failed Subscription Payment Alert |
| Retention risk | Replenishment Reminder |
| Refund spike | Refund Alert |
| Operational change, unfulfilled backlog | Fulfillment SLA |
| Experience regression | Review Accelerator |
| SKU underperformance | Slow Mover Digest |
Running one product
- Sentinel only — full monitoring, briefings, and insights without automations
- Engine only — operating score and playbooks without Sentinel's extended store memory and anomaly engine
- Both — recommended for brands that want prioritized signal plus one-click remediation paths
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