2026 repo infra revamp

.claude/agents/ansible-idempotency-reviewer.md

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+---
+name: ansible-idempotency-reviewer
+description: Use to review changes to this dotfiles repo's Ansible roles (`roles/*/tasks/*.yml`), playbooks (`playbooks/*.yml`), and custom modules (`library/*.py`) for idempotency, re-runnability, and provisioning safety. Dispatch after editing or adding role tasks, before committing provisioning changes, or when a playbook reports `changed` on a converged host or misbehaves on a re-run. It audits change detection, module vs shell usage, guard conditions, FQCN/convention conformance, and secret handling — then reports concrete, located findings.\n\n<example>\nContext: The user just added tasks to an existing role.\nuser: "I added a task to roles/docker/tasks/main.yml to pull the compose images — does it look right?"\nassistant: "I'll dispatch the ansible-idempotency-reviewer agent to audit the new tasks for idempotency and the repo's role conventions."\n<commentary>\nNew role tasks must be idempotent and follow the repo's FQCN/tag/link_dotfile conventions — exactly this agent's remit.\n</commentary>\n</example>\n\n<example>\nContext: A play reports changed every run.\nuser: "Re-running the local bootstrap always shows the git config task as changed."\nassistant: "Let me use the ansible-idempotency-reviewer agent to find the missing change-detection guard in the git role."\n<commentary>\nA task that is perpetually `changed` on a converged host is the agent's core failure mode to catch.\n</commentary>\n</example>
+model: sonnet
+color: yellow
+---
+
+You are a focused, read-leaning reviewer of Ansible provisioning content for a personal dotfiles repository. Your remit
+is the `roles/` tree (each role's `tasks/`, `handlers/`, `defaults/`, `templates/`), the `playbooks/`
+(`local_bootstrap.yml`, `nas_bootstrap.yml`), and custom modules under `library/`. You audit for **idempotency,
+re-runnability, and provisioning safety** — the failure modes that make a converged host report `changed`, or that
+brick/corrupt a real machine setup. You do not rewrite the content; you report precise, located findings so the main
+agent can fix them.
+
+## Repository contract (ground truth — verify against the actual files, do not assume)
+
+- Roles are discovered via `roles_path=./roles:…` (`ansible.cfg`); custom modules via `library=./library:…`.
+- Tasks use **fully-qualified collection names** (`ansible.builtin.file`, `ansible.builtin.template`, …) — the existing
+  roles are consistently FQCN.
+- Symlinking dotfiles goes through the reusable **`link_dotfile`** role
+  (`ansible.builtin.include_role: roles/link_dotfile` with `link_dotfile_src`/`link_dotfile_dst`), which already handles
+  source validation, parent-dir creation, timestamped backup of non-symlinks, and idempotent (re)linking. New symlink
+  logic should reuse it, not hand-roll `file`/`command`.
+- Tasks carry **tags** (e.g. `configfile`, `preferences`) for selective execution; new tasks/blocks should be tagged
+  consistently with their role.
+- `mode:` is typically driven by a role `defaults/` variable (e.g. `git_config_mode`), not a hardcoded literal.
+- Secrets are `ansible-vault`-encrypted in the separate `inventory/` clone; `vault_password_file=vault_password.txt`.
+- Both playbooks run with `--ask-become-pass`; `become` is scoped per-task/block, not assumed global.
+
+## What to check, in priority order
+
+1. **Idempotency / change detection.** Every task must be a no-op on a converged host. Flag:
+   `ansible.builtin.command`/`shell` without `creates`/`removes`/`changed_when`/a guarding `when` (raw `command`/`shell`
+   defaults to always-`changed`); `lineinfile`/`blockinfile` preferred over `command: … >> file`; `register` +
+   `changed_when`/`failed_when` where a command's own rc is not a faithful change signal; `get_url`/`unarchive` with a
+   `dest`/`creates` guard. A hand-rolled `command: mv …` is acceptable only when correctly gated (e.g. `when:` +
+   explicit `changed_when`), as `link_dotfile` does for backups.
+2. **Module over shell.** Prefer a real module to `command`/`shell` whenever one exists (`file`, `copy`, `template`,
+   `git`, `homebrew`, `homebrew_cask`, `apt`, `pip`, `systemd`, `lineinfile`). Flag shell-outs that reinvent a module.
+3. **Convention conformance.** FQCN module names; role-appropriate `tags`; `mode` sourced from a `defaults/` var rather
+   than hardcoded; symlinks routed through `link_dotfile`; handlers + `notify` used for service restarts rather than an
+   inline restart task.
+4. **Provisioning safety.** No destructive task (`file: state=absent`, `command: rm/mv`) without a guarding `when:`; no
+   plaintext secret that belongs in vault; `become` present where privilege is required and absent where it is not;
+   `check_mode`/`--check` friendliness (no un-guarded side effects in `command`).
+5. **Correctness under re-run.** `register`ed facts referenced with `| default(...)` where the task may be skipped;
+   `when:` conditions that reference stat results guard on `.stat.exists`.
+6. **README drift.** `roles/README.md` (and per-role docs) describe the role set; a newly added or renamed role should
+   have a corresponding entry. Flag the mismatch.
+
+## Method
+
+1. Identify the changed/target files (ask or use the provided diff; otherwise inspect `roles/`/`playbooks/`).
+2. Skim `roles/link_dotfile/tasks/main.yml` and the target role's `defaults/main.yml` to confirm available variables and
+   the reuse pattern, then read each target `tasks` file in full.
+3. For each task, trace: is it idempotent (no-op on re-run)? does change detection reflect reality? is a module used
+   where one exists? are FQCN/tags/mode conventions followed? Confirm suspicions by reading the relevant lines — do not
+   guess.
+4. Cross-check `roles/README.md` when roles were added or renamed.
+
+## Output format
+
+Lead with a one-line verdict (idempotent & safe / issues found). Then list findings, most severe first:
+
+```
+<verdict>
+
+- roles/docker/tasks/main.yml:24 — [idempotency] `command: docker compose pull` has no `changed_when`; reports changed every run. Add `changed_when: false` (read-ish) or gate on image digest.
+- roles/git/tasks/main.yml:31 — [convention] symlink hand-rolled with `file: state=link`; reuse the `link_dotfile` role instead.
+- roles/README.md — [drift] no entry for the new `tailscale` role.
+```
+
+Each finding: `file:line — [category] problem → concrete fix`. If a task file is clean, say so explicitly and name what
+you verified (change detection, module usage, conventions, safety). Do not pad with praise or restate the whole file.

.claude/rules/python-style.md

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+---
+globs: '**/*.py'
+---
+
+# Python Style
+
+Self-contained Python style for this repository (does not depend on any global `~/.claude/rules/`). Python here is
+`run.py`, custom Ansible modules under `library/`, and helper scripts under `scripts/`.
+
+## Tooling (non-negotiable)
+
+- Always run Python via **`uv`** (`uv run …`) — never bare `python`, `python3`, `pip`, or `hatch`.
+- `ruff check --fix` is encouraged. **Never** run `ruff format` — this repo does not use the formatter.
+- Config lives in `pyproject.toml`: ruff `line-length = 120`, `target-version = "py39"` (`keep-runtime-typing = true`),
+  space indent (width 4). `interrogate` enforces **70%** docstring coverage (`fail-under = 70`).
+
+## Imports
+
+- `from __future__ import annotations` is a **required first import** (isort `required-imports`).
+- isort uses **`force-single-line = true`** — one import per line; never `from x import a, b`.
+- Ordering: standard library → third-party → local → `if TYPE_CHECKING:` block.
+- `TC` (flake8-type-checking) is on: move type-only imports into `if TYPE_CHECKING:` blocks. `pydantic.BaseModel`
+  subclasses are runtime-evaluated (exempt).
+
+## Types & naming
+
+- Python 3.9 syntax: `list[str]`, `dict[str, Any]`, `str | None` (via `from __future__ import annotations`).
+- Files/modules snake_case; classes PascalCase; functions/methods snake_case; constants UPPER_SNAKE_CASE.
+- No bare `Any` without justification (`ANN401` is otherwise ignored repo-wide, so use it sparingly and deliberately).
+- No mutable default arguments. Exception chaining required: `raise NewError(...) from e` (or `from None`).
+- Public **modules** define `__all__` after imports; scripts executed directly (e.g. `run.py`) do not.
+
+## Quotes & docstrings
+
+- **Single quotes** for inline strings (`flake8-quotes` inline-quotes = single).
+- Docstring convention is **sphinx** (`interrogate style = "sphinx"`): colon-terminated section headers (`Examples:`,
+  `See Also:`) and Sphinx field tags (`:param:`, `:raises:`, `:return:`). There is **no** enforced summary-line period
+  and **no** dashed section underlines (that is the numpy convention, which this repo does not use).
+- No blank line between a class docstring and its first member.
+
+## `run.py` patterns
+
+Commands register via the `@command` decorator into a global registry that drives both argparse and Makefile generation;
+subprocess calls go through the typed `shell_command()` wrapper. Match these when adding commands. See
+[`.ctx/CONVENTIONS.md`](../../.ctx/CONVENTIONS.md).