Create a LangChain Deep Agents Harness Profile for NVIDIA Nemotron 3 Ultra to Improve Performance | NVIDIA Technical Blog

This post details the process of creating a LangChain Deep Agents harness profile for NVIDIA Nemotron 3 Ultra to improve agent accuracy without fine-tuning. It introduces the concept of harness engineering as an alternative to model fine-tuning, focusing on adapting the agent's interaction with the model. The post outlines a methodology involving running evaluation benchmarks, analyzing failures, proposing harness profile changes (e.g., adding middleware like ReadFileContinuationNoticeMiddleware to guide tool usage), and re-validating the improvements. It also discusses automating this harness engineering loop using agentic proposers and managed services like LangSmith Engine.