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Agent instruction files, explained

Short, practical guides on the files that drive coding agents — the thinking behind the Groundrules block catalog, readable with or without the product.

What is AGENTS.md?The instruction file coding agents read before touching your repo — what goes in it, where it lives, and a working example.CLAUDE.md examples that actually workThree real files — Next.js, Python API, monorepo — and the anti-patterns that make Claude Code ignore yours.How to structure a system promptThe seven-section order, hard vs. soft rules, variables, and how to test that any of it holds.