Architecture

Goal

This repo should read like a steady-state machine configuration, not a diary of whatever was necessary to survive the first migration.

The structure is intentionally split into three layers:

modules/: host-wide nix-darwin policy
home/: user-facing Home Manager config
config/: raw config payloads consumed by Home Manager

Host Layer

modules/base.nix owns baseline Nix settings, shells, and common packages
modules/packages.nix owns the heavier developer tooling and fonts
modules/homebrew.nix is the explicitly narrow Brew escape hatch for GUI casks, including Codex because the Homebrew-distributed app is a better fit here than a source build
modules/macos.nix owns system defaults and macOS-specific integration

Home Layer

each app/tool gets its own module under home/
raw config trees live under config/ and are linked by Home Manager
home/migration.nix is the only place where takeover logic for old ~/dots symlinks lives

That separation matters. Steady-state modules should describe how the machine works today. Migration-only ownership cleanup belongs in one place and should be easy to delete later.

Package Sources

Default rule:

use nixpkgs for stable everyday tooling

Exceptions:

use dedicated flake inputs for fast-moving product CLIs whose release cadence matters to the machine owner

Current dedicated inputs:

googleworkspace-cli
claudeCode

Intentional Pragmatism

Some pieces are still pragmatic compatibility shims rather than ideal upstream state:

modules/macos.nix carries a Karabiner launch-agent override because current nix-darwin still points at the older Karabiner bundle layout
home/claude.nix manages ~/.local/bin/claude so the Nix package cleanly replaces the old manual path that was already first in shell PATH

Those are acceptable as long as they are explicit and documented.

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