Composable and Evolvable Agent Harness FoundryHarnessXDarwin-Agent • Updated 2026 Jul 6 5:34 HarnessX: A Composable, Adaptive, and Evolvable Agent Harness FoundryAI agent performance depends critically on the runtime harness, comprising the prompts, tools, memory, and control flow that mediate how a model observes, reasons, and acts. Yet today's harnesses...https://arxiv.org/abs/2606.14249