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 — 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

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