Add Codex skin pack installer skill

README.md

@@ -59,6 +59,7 @@ Skills are organized by domain under `skills/`. Each skill is a folder with a `S
 - [`accessibility-basic-check`](skills/frontend/accessibility-basic-check/SKILL.md): Check contrast, labels, focus order, and keyboard navigation for regressions.
 - [`css-layout-helper`](skills/frontend/css-layout-helper/SKILL.md): Diagnose layout intent and provide minimal flex/grid fixes with rationale.
 - [`cli-ux-improver`](skills/frontend/cli-ux-improver/SKILL.md): Improve CLI defaults, help text, and errors with actionable next steps.
+- [`codex-skin-pack-installer`](skills/frontend/codex-skin-pack-installer/SKILL.md): Install, verify, apply, switch, and restore public-safe Codex desktop skin packs.
 
 ### Backend
 - [`caching-strategy-helper`](skills/backend/caching-strategy-helper/SKILL.md): Choose cache type, TTLs, and invalidation triggers based on freshness needs.

skills/frontend/codex-skin-pack-installer/SKILL.md

@@ -0,0 +1,41 @@
+---
+name: codex-skin-pack-installer
+description: Install, validate, apply, switch, and restore Codex desktop skin packs. Use when a developer wants to customize Codex safely without modifying app files or leaking private workspace screenshots.
+---
+
+# Codex Skin Pack Installer
+
+## Purpose
+Help a developer install and test public-safe Codex desktop skin packs with a reversible workflow.
+
+## Inputs to request
+- Operating system and whether the official Codex desktop app is installed.
+- Desired skin slug, for example `caishen-readable` or `mythic-guardian-noir`.
+- Whether they want a temporary preview, a persistent apply, or a full restore.
+
+## Workflow
+1. Start with safety: confirm this is an unofficial skin pack, avoid private screenshots, and explain the restore path before applying anything.
+2. Prefer the maintained install route:
+   ```bash
+   npx skills add ChannelerH/codex-skin-packs --skill codex-skin-pack-installer --global --agent codex --yes
+   ```
+3. Ask Codex to use the installed skill for the requested skin:
+   ```text
+   Use $codex-skin-pack-installer to install the caishen-readable Codex skin pack and tell me how to restore the default theme.
+   ```
+4. Verify the skin package before applying it: check that `theme.json`, assets, and restore guidance are present, and that the pack does not contain private workspace screenshots.
+5. Apply or preview the skin only after verification, then confirm the user can still read sidebar text, task output, diffs, and composer input.
+6. If the user reports readability, persistence, or restart issues, switch to the previous known-good skin or restore the default theme first, then debug.
+
+## Output
+- Exact install command.
+- The selected skin slug and source URL.
+- Verification result and any safety warnings.
+- Apply/preview status.
+- Restore command or plain-language restore steps.
+
+## Quality bar
+- Do not claim OpenAI affiliation.
+- Do not publish or reuse private Codex screenshots.
+- Prefer reversible changes and one-command restore paths.
+- Treat readability as a hard requirement, not a visual preference.