AGENTS.md examples from real projects

How real projects brief Codex, Cursor and every other agent that reads AGENTS.md.

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Vercel 10k+ stars

VercelAGENTS.md

vercel / python

vercel/vercel/python/AGENTS.md

- Dependencies: PEP 440 compatible release clauses (rich ~= 14.0), avoid pinning patch releases (rich ~= 14.0.0). - Only add code that is actually used. No speculative APIs or exports. - _internal/ is private — no backwards compatibility needed when refactoring. - uv: uv sync, uv run <cmd>, uv add <pkg> - ruff: uv run ruff check . (lint), uv run ruff format . (format) - pytest: uv run pytest, uv run pytest tests/test_foo.py, uv run pytest -k test_name. Tests…

16k19d agoReviewMount

CLAUDE.md vs AGENTS.md

About AGENTS.md

What is AGENTS.md?

An open format for instructions to coding agents, read by Codex, Cursor and others. Think of it as a README written for agents.

Where does it go?

At the repository root, with more specific files in subdirectories. Agents read the one closest to the file they're editing.

What should it contain?

Setup and test commands, code style, and the rules a new contributor would need to know.

Does Claude Code read it?

Claude Code reads CLAUDE.md. A one-line CLAUDE.md that points at AGENTS.md covers both.