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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## System Overview
+
+This is a NixOS system configuration repository using Nix flakes with home-manager integration. The configuration manages multiple machines:
+- **xps13**: Dell XPS 13 laptop with Hyprland desktop environment
+- **Titan**: Server configuration 
+- **Athena**: Server configuration
+
+## Architecture
+
+The configuration is organized using a modular structure:
+
+- `flake.nix`: Main flake configuration defining system inputs and outputs for all machines
+- `modules/`: Shared configuration modules
+  - `configuration-common.nix`: Common system settings shared across machines
+  - `configuration-[machine].nix`: Machine-specific system configurations
+  - `hardware-configuration-[machine].nix`: Hardware-specific configurations
+  - `home-manager-common.nix`: Common home-manager packages and settings
+  - `hyprland.nix`: Hyprland window manager configuration
+  - `waybar.nix`: Waybar status bar configuration
+- `home-[machine].nix`: Machine-specific home-manager configurations
+- `home/`: User dotfiles and configuration files
+- `secrets/`: SOPS encrypted secrets
+
+## Key Technologies
+
+- **NixOS**: Declarative Linux distribution
+- **Nix Flakes**: Modern Nix package management with lockfile
+- **Home Manager**: Dotfile and user environment management
+- **SOPS**: Secret management with encryption
+- **Disko**: Declarative disk partitioning
+- **Hyprland**: Wayland compositor (xps13 only)
+- **Neovim**: Custom neovim configuration from external git repository
+
+## Common Commands
+
+### System Management
+```bash
+# Build and switch to new configuration (requires sudo)
+sudo nixos-rebuild switch --flake .#[machine-name]
+
+# Build without switching (test configuration)
+nixos-rebuild build --flake .#[machine-name]
+
+# Test configuration (temporary, reverts on reboot)
+sudo nixos-rebuild test --flake .#[machine-name]
+
+# Check flake for errors
+nix flake check
+
+# Update flake inputs
+nix flake update
+
+# Show available system generations
+nixos-rebuild list-generations
+```
+
+### Machine-Specific Examples
+```bash
+# XPS 13 laptop
+sudo nixos-rebuild switch --flake .#xps13
+
+# Titan server
+sudo nixos-rebuild switch --flake .#Titan
+
+# Athena server  
+sudo nixos-rebuild switch --flake .#Athena
+```
+
+### Development
+```bash
+# Enter development shell with nix tools
+nix develop
+
+# Format nix files
+nix fmt
+```
+
+## Important Notes
+
+- All machines use the username `th3r00t`
+- Neovim configuration is managed externally from `git.th3r00t.net/th3r00t/nvim-config.git`
+- SOPS is used for secret management - encrypted files are in `secrets/`
+- Hardware configurations are machine-specific and auto-generated
+- The flake uses nixos-unstable channel
+- Custom overlays are defined in flake.nix for package modifications