The library

Every prompt, annotated

Real, published system prompts from shipping AI products — each with source attribution and notes on what makes it work.

2 prompts Sort

Claude (claude.ai)

system prompt

Claude Sonnet 4.5 — Consumer System Prompt (claude.ai)

The claude.ai consumer system prompt for Claude Sonnet 4.5 (dated Sept 29, 2025). Opens with classic Claude persona rules (no URL opening, step-by-ste…

role definition persona constraint setting

195 8.7k 6.4k words

Claude Code

agent prompt

Claude Code 2.0.0 — Full System Prompt & Tool Suite

The complete shipped system prompt for Claude Code v2.0.0 (Sonnet 4.5), bundled with its full tool catalog. It defines a terse CLI software-engineerin…

role definition tool-use protocol few-shot

159 278 8.6k words