What is an Agent Harness? | Rubric Labs
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Learn how agent harnesses turn language models into systems that can plan, use tools, manage context, verify work, and control permissions.
A harness is the software that translates a model into a system that can affect its environment. For example, Pi is a harness that lets the model use your terminal to read and edit files on your computer. Functionally, a harness makes a model agentic, meaning it can take action. Put simply: Agent = Model + Harness The components of an agent harness[ 1 ] A few of the harnesses we'll discuss in this post include Claude Code, Codex, Cursor, OpenClaw, Hermes and Pi. They generally share the same underlying functional areas. Looping At a minimum, a harness collects LLM calls in a loop…
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