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

What this post added

This post details the creation of 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, using evaluation benchmarks and agent harness profiles as customization entry points. A specific example demonstrates how to fix a `read_file` tool failure by introducing `ReadFileContinuationNoticeMiddleware` to the harness profile, improving test results and overall evaluation scores. The post also discusses automating this harness profile creation process using an iterative loop similar to agentic workflows.