Spot over-allocation before it causes burnout.
The team overview stacks every person's weekly allocation as a percentage of capacity. Each colour band is one person. The per-person tab breaks the stack apart — click any name to see their individual week-by-week chart. Bars crossing 100% turn red. The simulator tab lets you drag individual weekly allocations and watch over-allocation alerts, KPI cards and team totals recalculate live.
The histogram does not get built until problems are already visible in symptoms — missed deadlines, irritable standups, a key person asking for time off mid-sprint. By then the over-allocation has been happening for weeks. Build the histogram during planning, before a single task is assigned, so over-allocation is caught on paper instead of in a person. Also: planning anyone at a sustained 100% with zero buffer guarantees the first surprise turns into a missed deadline.