nix-addFind and add a package or capability to the NixOS config, even without the exact package name.
nix-debugDiagnose and fix nixos-rebuild failures or nix evaluation errors. Agent-invocable -- other skills call this when a rebuild fails. Also usable directly when the user pastes an error.
nix-explainExplain what a block of nix config does in plain language. Layered explanation: what, how, why. Agent-invocable. Other nix-manager skills call this to teach, or the user asks directly.
nix-refineImprove the NixOS config toward idiomatic best practice, as a full audit or for one file or module.
nix-removeRemove a package, module, or capability from the NixOS config, and clean up every reference to it.