CLAUDE.md examples from real projects

How real projects brief Claude Code: the commands, conventions and warnings they put in CLAUDE.md.

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parcadei

parcadeiCLAUDE.md

ouros

parcadei/ouros/CLAUDE.md

Ouros is a sandboxed Python interpreter written in Rust. It parses Python code using Ruff's ruffpythonparser but implements its own runtime execution model for safety and performance. This is a work-in-progress project that currently supports a subset of Python features. Project goals: It's ABSOLUTELY CRITICAL that there's no way for code run in an Ouros sandbox to access the host filesystem, or environment or to in any way "escape the sandbox". Ouros will be used to run untrusted, potentially malicious…

1466mo agoReviewMount

CLAUDE.md vs AGENTS.md

About CLAUDE.md

What is CLAUDE.md?

A file Claude Code reads at the start of every session. It holds the commands, conventions and warnings the agent needs for this project.

Where does it go?

At the repository root. Claude Code also reads CLAUDE.md files in subdirectories when it works there.

What should it contain?

Build and test commands, the project's layout, conventions that aren't obvious from the code, and mistakes to avoid. Short files tend to work better than long ones.

CLAUDE.md or AGENTS.md?

Claude Code reads CLAUDE.md; most other agents read AGENTS.md. Many projects keep one and point the other at it.