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Definition

Agent Harness

An agent harness is the operational execution scaffolding that situates a foundation model within a closed-loop environment. Rather than serving as a minor implementation detail, the harness acts as a first-order determinant of agent capability. It determines what interaction history is retained, how local intent and planning are structured, which external tools or skills are exposed, how individual actions are executed, and when runtime verification or error recovery is initiated.

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Updated 2026-09-25

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Prep Sessions

Adaptive Agent Runtimes: Architecture, Synthesis, and State Control @ University of Michigan - Ann Arbor

Ch.1 Agent Harness Principles and Architecture - Adaptive Agent Runtimes: Architecture, Synthesis, and State Control @ University of Michigan - Ann Arbor

Foundations of Agent Harnesses and Model-Harness Pairing - Adaptive Agent Runtimes: Architecture, Synthesis, and State Control @ University of Michigan - Ann Arbor

Ahead-of-Time versus Just-in-Time Harness Construction - Adaptive Agent Runtimes: Architecture, Synthesis, and State Control @ University of Michigan - Ann Arbor

Four-Module Modular Harness Protocol - Adaptive Agent Runtimes: Architecture, Synthesis, and State Control @ University of Michigan - Ann Arbor

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