The Harness Is the Product The model supplies intelligence. The harness decides whether that intelligence becomes useful software. That is the simplest way to understand most AI product failures. A team picks a strong model, writes a decent prompt, connects a few tools, and watches an impressive demo work once. Then the same system meets real users, messy data, missing permissions, stale files, unclear goals, tool errors, and actions that should not happen without approval. A

An AI agent is not just a chatbot with a better prompt. It is a software system that can use an AI model to pursue a task across steps. It can observe information, decide what to do next, use tools, keep track of progress, and continue until it finishes, gets blocked, or needs a human to approve the next move. That definition matters because the word "agent" gets used too loosely. Some people use it for any chatbot. Some use it for any automation with an AI model inside. Some