$ cat system_prompt.txt

A curated arsenal of system prompts,
not a 10,000-prompt junkyard.

Every prompt here is hand-built around a real workflow — structured constraints, variables you fill in, and usage notes on the failure modes to watch for. Copy, paste, ship.

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Reverse-engineered system prompts

The actual system prompts behind Claude, ChatGPT, Cursor, Perplexity and more — official releases and reported leaks, each with its source and our analysis of the techniques worth stealing.

Gemini CLI System Prompt official
Google · observed 2026-09-08

v0 System Prompt reported
Vercel · observed 2026-05-10

Claude Code System Prompt reported
Anthropic · observed 2025-12-02

Claude Sonnet 4.5 System Prompt official
Anthropic · observed 2025-09-29

Latest curated prompts