I was bit disappointed how few metrics the article mentioned. There are tons of code quality metrics that have been thought of over the last 40 years. We don’t have a good idea which ones are worth enforcing though. And we don’t know if the metrics that are good for humans are also good for LLMs

https://dekobon.github.io/big-code-analysis/metrics.html

https://dekobon.github.io/big-code-analysis/metrics-vcs.html