Unverified60% confidenceFactExact time
The Harness architecture divides an agent into two parts: the large language model itself (analogous to a CPU) and everything else besides the model (collectively called the Harness, analogous to an operating system).
2
Sources
60%
Confidence
Long-term
Relevance
7/6/2026
First Seen
Sources
Harness Architecture Explained: The Next-Generation Design Paradigm for Agent Development
bilibili马士兵官方账号6/25/2026
Related Claims
UnverifiedA system that connects models, tools, state, and feedback is commonly referred to as a Harness, i.e., the operational framework of an agent.72% similarUnverifiedThe same model can perform very differently across different tools; the model determines the system's lower bound while the Harness determines the upper bound of agent performance.71% similarUnverifiedHarness refers to the toolchain that drives a coding agent's operation, including the CLI program, model backend, system prompt, and toolset configuration; different harnesses (such as Claude Code, Codex, OpenCode) differ in context length, tool-calling format, and permission model.71% similarVerifiedHarness is not a large model, but a workbench (orchestration layer/AI Agent framework) wrapped around the model, responsible for the interface, session recording/replay, and tool invocation.71% similarUnverifiedThe Harness layered structure improves the decomposability and maintainability of tasks, but it also makes the runtime process harder to observe: a single user request triggers multiple model calls and tool calls, and context flow across agents is hidden inside the code.71% similar
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