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CLAUDE.md

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+# setup-macos Guidelines
+
+## Repository Purpose
+Automated setup scripts for configuring macOS with common tools, languages, and settings.
+
+## Commands
+- Run main setup: `./setup.sh`
+- Run individual components: `source ./languages/ruby` or `bash ./languages/node`
+- Check script syntax: `shellcheck setup.sh utils.sh languages/* package-managers/* settings/*`
+
+## Style Guidelines
+- **Shell**: Bash-compatible shell scripts
+- **Error Handling**: Use `trap` for cleanup and error reporting
+- **Functions**: Source common utilities from `utils.sh`
+- **Formatting**: 2-space indentation, no trailing whitespace
+- **Naming**: Use lowercase with hyphens for files, lowercase with underscores for functions/variables
+- **Documentation**: Include comments for non-obvious operations
+- **Idempotence**: Scripts should be safe to run multiple times
+- **Security**: Validate user input, avoid eval, use quotes around variables
+
+## Testing
+Test changes manually by running the affected script and verifying the expected outcome.