What is an Agent Harness?
LangChain defines agent harness as infrastructure enabling perception, action, memory, and skill-loading for AI agents
“An agent is simply a model plus a harness (infrastructure).”
LangChain explains the 'agent harness' concept as the infrastructure layer that gives AI models file systems, sub-agents, and on-demand skills to avoid context window overload. They promote their open-source 'Deep Agents' framework as a pre-built harness covering these primitives. This is educational content marketing for LangChain Academy rather than a novel research or product announcement.