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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Claude Code

agent prompt

Claude Code — Core System Prompt (Sonnet 4)

An earlier, leaner Claude Code system prompt (Sonnet 4, dated 2025-08-19) without the bundled tool schemas. It sets the terse CLI persona, prescribes …

role definition few-shot constraint setting

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