What it does
Tree-sitter handles measurable rules, while Jev considers softer questions such as side effects and framework idioms.
Agent tooling
five-lines
Reviews pull-request changes against the practical refactoring rules in Five Lines of Code.
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How you can use it
Try this with your developer when making code easier to maintain. Start with the included example, which can check rules without AI. Some rules use simple counting; others send code to an outside AI service. Use the findings to guide a real review, not replace it: neat code can still have bugs.