:PROPERTIES:
:ID: bf4dde56-0967-4374-94ed-771301e47c66
:END:

#+title: azos
#+filetags: :project: :knowledge:

* Architecture

azos is a NixOS/home-manager configuration repo with a two-tier feature system:

- =azos-core/= — git submodule containing shared, reusable features (base, editor, claude-memory, claude-skills, dev, etc.)
- =features/= — machine-specific features (claude, encryption, hyprland, audio, etc.)
- =home-manager/home.nix= — home-manager entry point; manually lists all modules to import
- =_machines/= — per-machine NixOS configs; passes =suiteModules= as =specialArgs=

Feature auto-discovery is via =import-tree= in each flake.nix. Features from both
=azos-core/features/= and =azos/features/= are collected into =config.flake.modules=.

** Module registration pattern

Each feature's =default.nix= registers itself:

#+begin_src nix
config.flake.modules.homeManager.<name> = { lib, config, pkgs, ... }: {
  options.azos.<name>.enable = lib.mkOption { ... };
  config = lib.mkIf config.azos.<name>.enable { ... };
};
#+end_src

Modules are then imported in =home-manager/home.nix= via:

#+begin_src nix
imports = [ suiteModules.homeManager.<name> ... ];
#+end_src

** Option namespace

=azos.<feature-name>.<option-name>=

Dependencies between features use =lib.mkDefault true= to auto-enable:

#+begin_src nix
azos.claude-memory.enable = lib.mkDefault true;
azos.claude-skills.enable = lib.mkDefault true;
#+end_src

** File deployment

- Static files: =home.file."path".source = ./file;=
- Generated text: =home.file."path".text = "...";=
- Runtime scripts (e.g. merging JSON): =home.activation.<name> = lib.hm.dag.entryAfter ["writeBoundary"] ''...'';=

** Claude Code integration

Three azos-core features wire up Claude Code:
- =claude-memory= — registers org-roam-mcp as a global MCP server in =~/.claude.json=
- =claude-skills= — deploys skills to =~/.claude/commands/= and content to =~/.claude/CLAUDE.md=
- =claude= (=azos/features=) — installs claude-code, auto-enables the above two

* Conventions

- azos-core features belong to the submodule; machine-specific features live in the outer repo
- Extensible options follow the pattern established by =azos.claude.globalSkills= and =azos.claude.globalMdSections=: attrsets any module can contribute to, deployed by the owning feature
- Emacs config is literate org: =azos-core/features/editor/emacs/config.org=
- Emacs base config: =azos-core/features/base/emacs/config.org=
- agent-shell defaults to Claude Code on lauretta via =(setq agent-shell-preferred-agent-config 'claude-code)= in =features/lauretta/emacs/config.org=; this symbol skips agent selection entirely (no prompt)
- Rebuild command: =azos-lauretta-update=
- Format: =nix fmt=
- Packages in overlay: =pkgs.<name>= via =config.flake.overlayPkgs.<name>=
- Unstable packages: =pkgs.unstable.<package>=

* Gotchas

- =azos-core= is a git submodule — =git add= must be run inside it separately from the outer repo
- Nix flakes only evaluate git-tracked files; new files must be staged (=git add=) before =nix build= will see them
- =import-tree= auto-discovers features but only sees tracked files — same constraint
- The machine name is =lauretta=; machine config is at =_machines/lauretta.nix=
- org-roam-mcp is forked at =anerisgreat/org-roam-mcp= (not upstream =aserranoni/org-roam-mcp=); fork fixes: =create_node= writes directly to SQLite so new nodes are immediately searchable (no emacsclient needed), and =cli_main= is defined natively (no postPatch needed)
- emacsql stores all Emacs strings in SQLite with surrounding ="..."= — the Python DB layer strips these with =_clean_path=/_clean_string=
- org-roam timestamps in SQLite are Emacs =(HIGH LOW USEC PSEC)= tuples: =HIGH = secs >> 16=, =LOW = secs & 0xFFFF=
- =postPatch= in Nix derivations: alejandra reformats the indentation of multiline strings, which can change the effective shell script content

* Key Files

| File | Purpose |
|------+---------|
| =azos-core/features/claude-memory/default.nix= | org-roam MCP server integration |
| =azos-core/features/claude-skills/default.nix= | global skills + CLAUDE.md deployment |
| =azos-core/features/claude-skills/skills/todo.md= | per-project TODO management skill |
| =azos-core/features/claude-skills/skills/project-brain.md= | org-roam second brain skill |
| =azos-core/features/claude-skills/README.md= | skills extensibility docs |
| =azos/features/claude/default.nix= | installs claude-code, enables claude-memory + claude-skills |
| =azos/home-manager/home.nix= | home-manager entry point, imports all modules |
| =azos-core/features/editor/emacs/config.org= | literate Emacs config (org-roam at line ~452) |
| =azos/azos-core= | git submodule pointing to shared feature library |
| =features/lauretta/emacs/config.org= | lauretta-specific Emacs overrides (agent-shell, LLM, beacon, caldav) |
| =~/.claude/settings.json= | Claude Code global permissions; read-only org-roam MCP tools are always-allowed here |

* org-roam Setup

- Directory: =~/roam/=
- Database: =~/.emacs.d/org-roam.db= (sqlite-builtin connector)
- MCP server: =org-roam-mcp= registered in =~/.claude.json= via home-manager activation
- org-agenda now includes =~/roam/= so TODOs in roam files appear in agenda

* Subnodes

(none yet)