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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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MicrosoftCLAUDE.md

rnx-kit / fork-sync

microsoft/rnx-kit/incubator/fork-sync/CLAUDE.md

MANDATORY RULES 1. DISCUSS before implementing - Answer questions first, code after agreement 2. Use node directly for TypeScript - NOT tsx, ts-node, or tsc 3. Check the platform - Claude Code knows the OS (Platform: in system prompt). Follow the platform-specific rules below. Sync forked/vendored dependencies with upstream using Git 3-way merge with AI-assisted conflict resolution. Note: Claude/Copilot integration tests are slow (invoke external CLIs) and are skipped by default. Use yarn test:all or set RUN_INTEGRATION=1 to include them.

1.7k7mo agoDeletes or force-pushesDiscuss
MicrosoftCLAUDE.md

playwright-java

microsoft/playwright-java/CLAUDE.md

The Java client is a port of the JavaScript client in ../playwright/packages/playwright-core/src/client/. When implementing or changing a method, read the corresponding JS file first and mirror its logic. Project checkouts (including the upstream playwright repo) live in the parent directory (../). Use the gh cli to interact with GitHub. Semantic commit messages: label(scope): description Labels: fix, feat, chore, docs, test, devops Never add Co-Authored-By agents in commit message. Never add "Generated with" in commit message. Never add test plan to…

1.6k15d agoDiscuss
MicrosoftCLAUDE.md

fluentui-react-native

microsoft/fluentui-react-native/CLAUDE.md

See @AGENTS.md for guidance on working with code in this repository.

1.4k4mo agoDiscuss
MicrosoftCLAUDE.md

fhir-server

microsoft/fhir-server/CLAUDE.md

Core project guidelines, coding conventions, and architectural principles are in AGENTS.md — read it first. This file adds Claude-specific skill activation instructions. Skills live in .github/skills/<skill-name>/SKILL.md. Claude cannot discover them automatically — use the Read tool to load the relevant skill before starting any architecture task. Example: Read(".github/skills/create-adr/SKILL.md") Happy coding!

1.4k4mo agoDiscuss
MicrosoftCLAUDE.md

skills-for-fabric

microsoft/skills-for-fabric/CLAUDE.md

Updates: fabric-collection is a third-party marketplace, so enable auto-update once: run /plugin, open Marketplaces, select fabric-collection, and choose Enable auto-update. Administrators can instead set "autoUpdate": true on its extraKnownMarketplaces entry in managed settings. To update on demand, run claude plugin update <plugin>@fabric-collection. If these files were copied in loosely rather than installed as a plugin, compare the local package.json version against the remote (git fetch origin main --quiet && git show origin/main:package.json) and re-copy if it is newer. This project…

1.2k6d agoDiscuss

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.