Monitors a heartbeat JSON file in the Daily AI Agents OS workspace memory and alerts when the modified timestamp goes stale beyond a configured threshold. Fits into the broader dailyai-os runtime where Hermes and OpenClaw agents maintain liveness signals as they execute bash-based skills across scheduled tasks, inbound routing, and local LLM orchestration. You'd wire this into your launchd or daemon supervision layer to catch agent freezes before they cascade into missed inbox checks or stale browser sessions. The default silence window isn't specified in the repo, but the pattern is standard dead man's switch logic for any autonomous system that writes periodic health markers to disk.