My favorite thing about this project is the automatic changelog I now get for all Claude.ai system prompt changes: https://github.com/simonw/claude-system-prompts/blob/main/CH...

The summaries are generated by GPT-5.6 Luna because I don't trust Claude to summarize its own system prompts without being influenced by them (though to be fair the system prompts it summarizes are for the Claude consumer app, not Claude via the API).

There's even an Atom feed: https://simonw.github.io/claude-system-prompts/feed.atom