In emergency medicine, volume negates luck. However no one gets volume in the events that kill but don't happen often. HALO is an open-source ED module for High Acuity, Low Occurrence events, built into the track board nurses already use. When a mass casualty hits: deterministic reverse triage frees beds in milliseconds, one-click AI triage turns a 15-second field note into an evidence-quoted SALT category, a Claude agent reconciles nameless patients against the chart panel (propose-only, human-confirmed), and a second agent audits the log against EMTALA. Plus a simulation lab where rare decisions have consequences — before they have patients. Fail-closed, citation-backed, synthetic data, 275 tests.
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