Agent skill

nix-rebuild

Rebuild nix-darwin/NixOS system after dotfiles changes. Use when config files managed by Nix (lazygit, ghostty, etc.) need to be regenerated, or after editing any .nix file in the dotfiles repo.

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/edmundmiller/dotfiles/tree/main/.pi/skills/nix-rebuild

SKILL.md

Nix System Rebuild

After changing any Nix-managed config in ~/.config/dotfiles, the system must be rebuilt for changes to take effect. Nix store symlinks are read-only — you cannot edit them in place.

Quick Rebuild

bash
cd ~/.config/dotfiles
sudo darwin-rebuild switch --flake .

darwin-rebuild has a NOPASSWD sudoers rule, so this works non-interactively.

Using hey

The hey command wraps rebuilds:

bash
hey rebuild    # or: hey re
hey test       # build + activate without boot entry
hey rollback   # roll back to previous generation

When to Rebuild

  • After editing any .nix file
  • After editing config files symlinked through home-manager (lazygit, ghostty, etc.)
  • When you see "permission denied" writing to a Nix store path

Workflow

  1. Edit source config in ~/.config/dotfiles/
  2. Commit changes
  3. Run sudo darwin-rebuild switch --flake ~/.config/dotfiles
  4. Verify the symlink now points to updated Nix store path

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