The Agent Harness: What It Is and Two Ways to Build One

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Posted on Fri Sep 25 2026 | 2:30 pm

This article explains the development and operational layers of an agent harness through two implementations of a finance assistant: AWS AgentCore Harness and LangChain with Envoy AI Gateway. It compares how each handles tools, memory, model access, cost control, and observability, and examines the trade-offs in operational ownership, portability, and engineering effort.

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