Use when writing or editing Emacs Org mode content — `.org` files, fenced org code blocks, or when the user asks for documentation, notes, or task lists in org-mode format. Encodes conventions that keep org documents interactive in Emacs (cycleable TODO state, statistics cookies for parent headings, agenda-friendly structure).
Use this skill when the user asks to add, draft, scaffold, or "stub out" a new OCI/podman containerized service for atlas (or any host using `modules.linux.oci.services.*`). Triggers include "add a new service", "set up <service> on atlas", "create an OCI module for X", "wrap <X> in nix", or any request to integrate a new docker-compose-style service into the dotfiles repo. The skill encodes hard-won conventions from the atlas-oci migration — sops patterns, postgres gotchas, encrypted dataset handling, gluetun integration, ZFS layout, and the bugs that bit during the original cutover.
Use when working with Nix code, flakes, NixOS modules, home-manager, or nix-darwin configurations. Provides Nix language idioms, common patterns, and debugging strategies.
Use Nushell (nu) for shell operations involving structured data manipulation (JSON, YAML, TOML, CSV, XML), complex pipelines that would be error-prone in bash, or when the user explicitly requests Nushell. Prefer native Unix tools (grep, head, tail, awk, sed, find) for simple text searching, filtering, and file operations where memory efficiency matters.