The library

Every prompt, annotated

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

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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

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