What Is a Harness?

This article explains the concept of an 'agent harness' in the context of AI development. It uses the analogy of a climbing harness to describe how software environments support and control AI models to create functional agents.
Why it matters
Understanding agent harnesses is essential for grasping how modern AI agents are structured and deployed in coding and other applications.
From: Earendil Product < rfc@earendil.com >
Harness – definition by the Cambridge Dictionary
Noun. a piece of equipment with straps and belts, used to control or hold in place a person, animal, or object
Verb. to control something, usually in order to use its power
When I think of a harness, I think first of the set of straps and belts that I put on in middle school before scrambling up the walls of my school. I was a mediocre climber at best.
If you’re main-lining into the AI newsfeed these days however, your archetypal harness may already be an agent harness. And, this post was not written for you.
This was written for those who may be curious to know what an agent harness is, but don’t, and have been too embarrassed to ask.
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