# Highlights from the Claude 4 system prompt

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

- Host: [simonwillison.net](https://links.thingelstad.xyz/hosts/simonwillison.net/)
- Saved: May 29, 2025 (2025-05-30T02:43:07Z)
- Record: https://links.thingelstad.xyz/links/8ff0eb636351/
- JSON: https://links.thingelstad.xyz/links/8ff0eb636351.json

## What Jamie wrote

This is an incredible read and gives you insight into how Anthropic creates the personality of Claude for people to interact with. Is this programming? It doesn't look like it but it sure feels like it. This lights up all sorts of thoughts for me on how agents will appear in the workplace. We will need to consider designing agent personas in a much broader way than "help people create a ticket". The tagging of different components is also very interesting. Wow.

## Facts

- Kind: [Page](https://links.thingelstad.xyz/kinds/page/)

## Appears in

- [WT321: Weekly Thing 321 / Saluting, Tetris, Sky](https://weekly.thingelstad.com/archive/321/), Notable

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## Elsewhere

- Wayback Machine: https://web.archive.org/web/*/https://simonwillison.net/2025/May/25/claude-4-system-prompt/