Prompting & Config
System Prompts Guide
Write system prompts that set Claude's behavior and hold it steady across a whole session.
Published March 2026
Look inside
A system prompt is the hidden set of instructions running behind every AI product before you type anything. It tells the model who it is, how to behave, what it can and cannot do, and how to handle edge cases. Most companies treat them as trade secrets. This repo leaked the full system prompts of more than 30 AI products and has 131,000 GitHub stars.
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