What is codex-dream-skin-studio?

A macOS skill for installing, customizing, launching, checking, repairing, updating, and restoring Codex Dream Skin Studio. It turns a personal image into a full-window Codex wallpaper while preserving the native interface.

It is for creating and verifying image-based Codex themes and troubleshooting or rolling them back on macOS.

It helps change the app's appearance safely while retaining navigation, controls, content, and a way to return to the official appearance.

codex-dream-skin-studio — Skill for Codex by xnydl

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add xnydl/codex-dream-skin --skill macos

Clone the repo

git clone --depth 1 https://github.com/xnydl/codex-dream-skin

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/xnydl/codex-dream-skin/macos.svg)](https://agentmods.dev/skills/xnydl/codex-dream-skin/macos)

Your own site

<a href="https://agentmods.dev/skills/xnydl/codex-dream-skin/macos"><img src="https://agentmods.dev/badge/skills/xnydl/codex-dream-skin/macos.svg" alt="Measured on agentmods" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 544 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00070	$0.00544
Opus 5	$0.00035	$0.00272
Sonnet 5	$0.00014	$0.00109
Haiku 4.5	$0.00007	$0.00054

Measured 8d ago against content hash f6c84211d70e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

codex-dream-skin-studio scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

The scan reads SKILL.md. This mod also ships 26 executable files (assets/renderer-inject.js, menubar/codex_dream_skin.10s.sh, presets/generate-presets.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

macos/SKILL.md · 37 lines

How it starts

The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Codex Dream Skin Studio

This file is an optional Codex capability entry. The delivery is a complete standalone project; users do not need to install it as a Skill.

Workflow

Run Install Codex Dream Skin.command from the complete project folder.
Run Customize Codex Dream Skin.command, choose an image in Finder, and enter a theme name.
Verify the live result with Verify Codex Dream Skin.command. A pass requires a visible native sidebar and composer, no horizontal overflow, non-interactive decoration, and—on the home route—a continuous wallpaper with live native heading, project controls, and any suggestion cards exposed by the current Codex version.
Restore the official appearance with Restore Codex Dream Skin.command.

Guardrails

Never modify the official .app, app.asar, or its code signature.
Use the official Codex app's signed Node.js runtime only after validating its signature, Team ID, architecture, and minimum version.
Bind CDP to loopback, verify that the listener belongs to Codex, and reject non-Codex renderer targets.
Preserve all native cards, navigation, project selectors, task content, composer controls, and keyboard focus.
Theme images must be UI-free wallpapers. Paint one 16:9 image continuously across the window; keep home expressive and task routes quieter. appearance: auto follows Codex/native or system appearance rather than image brightness.
Keep decoration at pointer-events: none.
Require explicit authorization before restarting an already-running Codex instance.
Stop an injector only when its recorded PID, executable, command line, and start time all match.

Key resources

README.md: user installation and customization guide.
scripts/injector.mjs: CDP connection, injection, removal, verification, and screenshots.
assets/dream-skin.css: live native interface styling.
assets/renderer-inject.js: idempotent DOM integration and cleanup.
scripts/doctor-macos.sh: signed-runtime, payload, and optional live-session self-check.
references/qa-inventory.md: release and visual acceptance criteria.

Read the full file on GitHub · 37 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 37 lines · 70 tokens per session scan A f6c84211d70e

Subscribe to this mod's changes

codex-dream-skin-studio is a skill published in the GitHub repository xnydl/codex-dream-skin (54 stars, last pushed 1mo ago), licensed MIT. It adds 70 tokens to every session and 544 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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