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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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VercelCLAUDE.md

next.js

vercel/next.js/.github/CLAUDE.md

No summary in the file. Open it to read it.

143k5mo agoDiscuss
VercelCLAUDE.md

streamdown / website

vercel/streamdown/apps/website/.claude/CLAUDE.md

This project uses Ultracite, a zero-config Biome preset that enforces strict code quality standards through automated formatting and linting. Biome (the underlying engine) provides extremely fast Rust-based linting and formatting.…

5.7k14mo agoDiscuss
VercelCLAUDE.md

ai-elements

vercel/ai-elements/.claude/CLAUDE.md

This project uses Ultracite, a zero-config preset that enforces strict code quality standards through automated formatting and linting. Oxlint + Oxfmt (the underlying engine) provides robust linting and formatting. Most…

2.4k8mo agoDiscuss
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.