Claude Code is powerful. Without structure around it, every session starts cold, plans live in chat history, and the spec you cared about is buried in a thread you will never re-read. I built Arness because I got tired of two things at once: the ad-hoc-prompting ceiling, and the ceremony every framework adds when it tries to fix it. It is an open-source Claude Code plugin marketplace, and you drive it with four slash commands. The four commands These are the user-facing surface. You do not pick between dozens of skills. You pick a verb that matches what you are doing right now, and the entry skill routes the rest. /arn-brainstorming → start a new product idea from scratch /arn-planning → turn a feature idea into a phased plan /arn-implementing → build the plan task-by-task /arn-infra-wizard → set up, deploy, or change infrastructure Enter fullscreen mode Exit fullscreen mode That is the whole vocabulary. If you can describe what you are doing in one verb, you know which command to run.…