OrchestraBench finds three unrecoverable fault modes

OrchestraBench found zero recovery in three of five tested multi-agent failure modes, while mean cascade radius grew from 0.9 to 4.7 as a controlled pipeline deepened from three to seven stages. The failure-injection study reports full recovery from tool faults, 30% recovery from ambiguous delegation, and no recovery from three latent or semantic modes; blind retry reproduced latent faults and delayed detection, though these were mechanism probes rather than production workloads. For builders treating the same-model five-task harness swing as evidence that orchestration matters, the next control is fault attribution: retries need a trusted checkpoint and a diagnosed cause, not another pass through corrupted state.