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Breaking Down Harness Engineering — How to Vibecode Like a Senior Engineer

Here's everything around the model that makes the model good — and how to build your own agent harness: the phased workflow, grading criteria, and guardrails that separate senior engineering from unguided vibecoding.

You must have heard of harness engineering and thought, what on the holy earth is this? No? Nevermind. If you're curious, keep reading. For this we'll start in the dinosaur age of LLMs, better known as the time when we were all reading about prompt engineering. Initially we started with how to write the perfect prompt so that a language model understands. Then we moved on to LLM awareness. What data do we provide to the LLM so that it is aware of the context of our prompt? This meant grounding the data ( RAG ),…