PreChart

README excerpt

# PreChart

**The chart drafts the visit note; the ambient conversation cross-examines it; the agent adjudicates the conflicts; the clinician steers — and the note follows.**

PreChart is a pre-charting **verification agent** for the office visit. It drafts a specialty-styled clinical note from the chart *and* the ambient conversation, and — where the two disagree — it doesn't just pick a side. Its founding assumption is what makes it different: **the chart and the conversation are two _fallible_ witnesses** (charts go stale and carry copy-forward/coding errors; patients misremember, use lay terms, and get mis-transcribed), so PreChart trusts neither by default. For each claim it gathers *adjacent, objective* evidence, proposes which account the evidence supports, and surfaces the conflict for the clinician. The clinician can accept the agent's call or **select the truth** themselves — and the note **updates live** to match. Nothing high-stakes is auto-written; the clinician signs off.

![PreChart concept](docs/agentic-loop.svg)

## How it works

**Two fallible witnesses in, gated to the visit.** The chart (FHIR problems, meds, labs, imaging, prior notes) and the ambient transcript are the inputs; a **temporal guard** admits only what was knowable *as of* the visit (a post-procedure report can't leak into a pre-visit note).

**The agent gathers evidence and adjudicates.** For each claim — from *either* side — it runs deterministic tools and reasons over them:

- **`triangulat