llama.cpp's start-up output is read as a shard becomes ready: the devices it used, its backend, and the layers it offloaded. That goes up with READY in a new ShardStatus.compute, is kept on the shard, and is shown by the admin API, ctl replicas (ON) and the console (COMPUTE). A shard given GPUs whose engine says it found no usable GPU or offloaded no layer is stopped and failed, even where nvidia-smi cannot be asked. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>