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So the default claude system prompts are bad and the flag --system-prompt-file lets us load claude with a custom system instruction for the model, it wonders why the hobbled their own system like this, it seems like the harness did most of the work in making it good

github.com/nklisch/clau... Released this to help customize it - it packages the normal not behavioral stuff and lets you include your own. I included some default options but fully customizable per project, or global config. It just runs Claude code with a custom dynamically creates prompt