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

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That is the whole vocabulary.…