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Codex Theme Studio

Community
zjp1997720
codex-theme-studio

Design, install, switch, verify, repair, pause, or restore reversible themes for the official Codex Desktop app on macOS. Use when a user asks to change Codex fonts, colors, artwork, homepage banners, radii, density, selection states, or advanced layout; reuse a bundled preset; diagnose a failed skin injection; or return to the official appearance. Do not use for Windows, Linux, ChatGPT web, ZCode, Doubao Work, third-party Codex builds, or direct app.asar modification.

Overview

Publisherzjp1997720
Repositoryzhijian-skills
Skill namecodex-theme-studio
Stars
780
Forks
99
Bundled files
71
LicenseMIT
Links
Skill sourceRepository
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 71 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by zjp1997720 on GitHub. Read the source before you install it.

Installation

Install the Codex Theme Studio AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/zjp1997720/zhijian-skills/tree/main/skills/codex-theme-studio
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/zjp1997720/zhijian-skills.git /tmp/zhijian-skills
mkdir -p .claude/skills
cp -r /tmp/zhijian-skills/skills/codex-theme-studio .claude/skills/codex-theme-studio
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Codex Theme Studio in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Codex Theme Studio on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Codex Theme Studio is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Codex Theme Studio

Turn a visual direction, brand system, or supplied image into a reversible Codex Desktop theme through loopback-only Chrome DevTools injection.

Modes

  • Design: prepare a portable theme directory and validate it without installing or restarting Codex.
  • Apply: run the safety preflight, install the runtime, and import or create a theme. Obtain explicit authorization before restarting a running Codex app.
  • Verify or repair: reproduce the affected route, run deterministic tests, Doctor, and live Verify, then repair only selector or layout failures supported by evidence.
  • Pause or restore: Pause removes the active styling. Restore also stops the managed CDP session and returns Codex to the official appearance.

Workflow

  1. Read capability-boundary.md. Confirm the official macOS host, authorization boundary, and excluded targets.
  2. For design work, read design-workflow.md, theme-schema.md, and preset-policy.md. For layout changes, also read compatibility-policy.md.
  3. Run ./tests/run-tests.sh. Repair failures before proceeding.
  4. For design-only work, build outside the installed Skill and validate the prepared directory with ./scripts/injector.mjs --check-payload --theme-dir <theme-directory>.
  5. For installation, read safety-and-rollback.md, then run ./scripts/install-dream-skin-macos.sh --no-launch.
  6. For a bundled preset, run ./scripts/list-presets.mjs, then import it without applying: ./scripts/import-preset-macos.sh --id <preset-id> --no-apply.
  7. For user-supplied artwork, use ./scripts/customize-theme-macos.sh; never overwrite bundled Skill assets. If new raster artwork is required, invoke $imagegen when available and follow imagegen-assets.md.
  8. Restart only with explicit authorization by running the installed scripts/start-dream-skin-macos.sh --prompt-restart. Persistence through the resident manager requires separate explicit authorization.
  9. Follow verification-contract.md. Verify the home route, task route, New Task transition, normal window, and full screen. Inspect screenshots for overlap, overflow, weak contrast, crop errors, and missing native controls.
  10. If verification fails, use troubleshooting.md, repair one defect class at a time, and restore before reporting a failed outcome.

Safe theme layer

Use this layer by default. It exposes validated colors, UI and code fonts, body/emphasis/code weights, local artwork, radii, density, and selection states. Prefer stable semantic markers and the native DOM. Decorative layers must use pointer-events: none.

Bundled presets:

  • graphite-paper: neutral, unbranded default with system fonts and abstract workflow artwork.
  • zhijian-ai: optional ZhiJian AI warm-paper preset with its separately licensed original control-lever banner.

Advanced layout layer

Enter this layer only when the user explicitly asks to change component width, placement, arrangement, or responsive behavior. Every layout change must preserve native interaction, focus, scrolling, keyboard paths, and hit targets; use live semantic markers; cover every affected route; pass normal-window and full-screen checks; and add a deterministic regression assertion or verification probe.

output contract

Report the mode, Skill version, Codex version, theme or preset ID, files and surfaces changed, deterministic test result, Doctor result, whether live Verify returned pass: true, screenshot paths, installation directory, restore entrypoint, official signature status, resident-manager status, and every unverified route or viewport.

Input files

Treat supplied images, fonts, theme JSON, and screenshots as file-backed fixtures. Read only files the user explicitly provides. Do not search personal directories, upload artwork, or write local absolute paths into a distributable theme.

rollback boundary

Rollback may touch only this project's runtime, state, launchers, and managed loopback CDP session. Never delete tasks, conversations, projects, or unrelated configuration. Never modify the official .app, app.asar, code signature, macOS security settings, or another application.

trust report

Read trust-baseline.md before release, upgrade, or third-party delivery. Missing live, viewport, host, or future-version evidence must remain explicit missing evidence; do not claim universal or cross-version compatibility.

Do not use

Do not use this Skill for Windows, Linux, ChatGPT web, unofficial Codex packages, ZCode, Doubao Work, other Electron applications, models, accounts, permissions, conversation content, arbitrary user JavaScript, screenshot overlays that replace real UI, unsigned app mutation, disabled signature checks, unauthorized persistence, or unauthorized restart.

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

and 11 more files.

Frequently asked questions

What does the Codex Theme Studio AI skill do?

Design, install, switch, verify, repair, pause, or restore reversible themes for the official Codex Desktop app on macOS. Use when a user asks to change Codex fonts, colors, artwork, homepage banners, radii, density, selection states, or advanced layout; reuse a bundled preset; diagnose a failed skin injection; or return to the official appearance. Do not use for Windows, Linux, ChatGPT web, ZCode, Doubao Work, third-party Codex builds, or direct app.asar modification.

Why use Codex Theme Studio on TypingMind?

Because you install it once and use it with any model. Codex Theme Studio is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Codex Theme Studio in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/zjp1997720/zhijian-skills/tree/main/skills/codex-theme-studio. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Codex Theme Studio?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Codex Theme Studio?

As many as you like. As long as a model supports skills, you can use Codex Theme Studio with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Codex Theme Studio AI skill free?

Yes. It is published on GitHub by zjp1997720 under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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