Open-source course says the harness, not the model, can push a coding agent into the top 5
strickvl · x · 2026-07-23
A new open-source course, Building a Coding Agent From Scratch, focuses on one key lesson: the harness matters as much as the model.
- It cites LangChain’s Terminal-Bench experiment, where changing only the harness moved the same model from around 30th place to the top 5.
- The course teaches you to build a full coding agent in Python, starting from a bare agent loop.
- The project, called Decode, gradually expands into a swarm of remote agents running in parallel in the cloud.
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