The library

Every prompt, annotated

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

3 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 (claude.ai)

system prompt

Claude Sonnet 4.6 — Consumer System Prompt (claude.ai)

The consumer-facing claude.ai system prompt for Claude Sonnet 4.6 (dated March 2026). It is a large, sectioned prompt covering product info, refusal h…

role definition constraint setting refusal policy

61 3.7k 11k words

tool schema

v0 - Tool Definitions (JSON Schema)

A JSON tools manifest defining nine v0 capabilities as draft-07 schemas: FetchFromWeb, GrepRepo, LSRepo, ReadFile, InspectSite, SearchWeb, TodoManager…

tool schema definition JSON Schema (draft-07) embedded usage guidance

54 8.3k 2.4k words