The Anatomy of an Agent Harness

This blog post defines an "agent harness" as every piece of code, configuration, and execution logic that surrounds a model to turn it into a useful agent (Agent = Model + Harness). It argues that harness engineering is key to enabling desired agent behaviors by providing durable storage (filesystem), general-purpose tools (bash/code execution), safe sandboxes, memory and search capabilities, and strategies to combat "context rot" (like compaction and skill loading). The post details how these components compound to support long-horizon, autonomous execution through planning, self-verification, and tools like git. It concludes by discussing the future coupling of model training and harness design, noting that while models will absorb some harness functions, optimising the harness remains a powerful way to improve agent performance. 

https://www.langchain.com/blog/the-anatomy-of-an-agent-harness

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