'For agents within an actual product, I have gravitated to using LangChain DeepAgents. I feel like their base harness is less heavy, and the…

"For agents within an actual product, I have gravitated to using LangChain DeepAgents. I feel like their base harness is less heavy, and their abstraction for building agents that use skills and tools is really nice." our harness is light, open source, and highly configurable! The frontier model lab harnesses are amazing - don’t get me wrong. I love Claude Code and Codex, and the lab companies have the unique moat where they can train their models such that they perform better in their harnesses. But I think the ‘opaqueness’ of what a harness is truly …

Source: Harrison Chase (X) | 2026-07-01