manage-codex-theme

A skill for installing, switching, checking, pausing, restoring, or removing Codex Desktop themes.

In plain words
What is it for?
Use it to inspect theme status, install published or local themes, switch the active theme, diagnose problems, and verify it with an optional screenshot.
Why use it?
It provides a controlled way to manage themes and verify that the selected theme matches the intended release.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/viisopen/get-codex-theme/manage-codex-theme
Any agent
npx skills add ViisOpen/get-codex-theme --skill manage-codex-theme
Clone the repo
git clone --depth 1 https://github.com/ViisOpen/get-codex-theme

Made for: Claude Code, Codex.

Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 851 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00092 $0.00851
Opus 5 $0.00046 $0.00426
Sonnet 5 $0.00018 $0.00170
Haiku 4.5 $0.00009 $0.00085

Measured 2d ago against content hash b47d6a285a58, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

manage-codex-theme 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 2d ago.

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.

plugins/get-codex-theme/skills/manage-codex-theme/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Manage Codex Themes

Use the pinned public CLI so the commands match this Plugin release:

npx -y [email protected] --help

Safe workflow

  1. Run npx -y [email protected] status --json and npx -y [email protected] doctor --json before changing runtime state. doctor is offline unless --live is explicitly supplied.
  2. Install and select a published theme with npx -y [email protected] use THEME@VERSION, or an exact local release candidate with npx -y [email protected] use PACK_DIRECTORY. This does not launch, close, or restart Codex. For local QA, verify that status --json reports the same id and version as the source manifest.
  3. If the compatibility runtime is already active, switch with npx -y [email protected] switch THEME; the runtime applies the new pointer without moving native Codex controls.
  4. Ask for explicit confirmation before running launch, resume, --launch, or --restart. State that these use an unofficial loopback-only CDP layer. Never infer restart permission from a request to install or switch a theme.
  5. Verify with npx -y [email protected] verify. Add --screenshot ABSOLUTE_PATH.png only when the user asked for a capture and the destination is known.
  6. Use pause for a temporary stock appearance while retaining the selected theme. Use restore to restore the previous pointer (or remove the active pointer when none exists), then tell the user to reopen Codex normally for the definitive stock appearance. Use the platform restore command when a live compatibility session also needs to be stopped. Use uninstall THEME only after confirming it is not active; reserve --force for an explicit user request.
  7. For pre-publish QA, require a clean demo workspace and inspect welcome branding, Home, a normal Task, sidebar menus, expanded terminal, Settings, banners and Dismiss actions, dialogs and Review actions, inputs, selected/disabled states, and a narrow window. Ask the user for visual confirmation; command success alone is not approval.
  8. Test restore before declaring local QA complete. If the user wants to keep testing, reselect the exact local pack only after restore succeeds.

Read the full file on GitHub · 62 lines

Files

What ships with it

1 file 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.

  1. 2d ago First seen · 62 lines · 92 tokens per session scan A b47d6a285a58

Subscribe to this mod's changes

manage-codex-theme is a skill published in the GitHub repository ViisOpen/get-codex-theme (1 stars, last pushed 1mo ago), licensed MIT. It adds 92 tokens to every session and 851 once invoked, about $0.0005 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 2026-08-31.

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