---
description: Lab tab badges — activity model, tab-counts API, read cursors
globs: backend/src/modules/notifications/**,backend/src/common/lab-case-activity.ts,frontend/src/lib/hooks/useTabBadgeCounts.ts,frontend/src/lib/tabBadgeUtils.ts,frontend/src/lib/api/notifications.ts,frontend/src/components/ui/shared/NavBadgePill.tsx,frontend/src/components/ui/shared/Sidebar.tsx
alwaysApply: false
---

# Lab tab badges

- **Split counts (Option B):** Lab Cases = sent + clinic comments + important; Lab Tasks = completions + lab comments; Clinic Treatment = visible lab comments + completions.
 - **API:** `GET /notifications/tab-counts`; **Cases + Treatment** use per-case read + `hasUnread` on list cards; Tasks marks read on tab visit. Treatment rail uses `TreatmentLabCasesPanel` + `LabCaseTrackerCard` + activity feed.
- **Pattern:** `useTabBadgeCounts` + `notifyTabBadgesChanged()` — same shape as `usePendingConnectionsCount`.
- **Orgs connections badge** stays on separate `pending-count` endpoint.

Full map: `.cursor/skills/lab-notifications/SKILL.md`