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
Codex CLI
system prompt

Codex CLI — System Prompt (2025-08-20)

A long, dated (2025-08-20) Codex CLI system prompt with rich behavioral sections: personality/tone, preamble messages before tool calls, an update_pla…

role definition persona tool-use protocol
201 6.7k 4.8k words
Codex CLI
system prompt

Codex CLI — Developer Message (Concise Edition)

A compact Codex CLI developer message framing the model as a terminal-based agentic coding assistant in a sandboxed, git-backed workspace. It sets a k…

role definition tool-use protocol constraint setting
126 6.1k 850 words