What is an agent harness?

Short summary

An agent harness is the comprehensive infrastructure layer that wraps a core AI model and tool-calling loop—all the complex engineering needed to support agent execution. It includes orchestration, error handling, state management, and other foundational systems. Understanding harnesses is critical for building reliable, production-grade AI agents.

• •Harness = infrastructure layer wrapping core model and tool loop
• •Includes orchestration, error handling, state management, and supporting systems
• •LangChain provides built-in harness components for production agents

Generated with AI, which can make mistakes.