npub1gv…utlwl on Nostr: I put together an annotated version of the new Claude 4 system prompt, covering both ...

I put together an annotated version of the new Claude 4 system prompt, covering both the prompt Anthropic published and the missing, leaked sections that describe its various tools

It's basically the secret missing manual for Claude 4, it's fascinating!

https://simonwillison.net/2025/May/25/claude-4-system-prompt/