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Given the more capable models like Opus and Fable, is it strictly necessary to prompt with such precision? Even Claude's own blog posts recently on removing a lot of the system prompt of Claude Code inself citing that it was "constraining" the model too much might be at play here too right?

If it's open source, where is the source? I couldn't find a link to a repository. There is a link to GitHub on the Contact Us page, but it's just a link to github.com.