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.
npx skills add codexthemes/skills --skill codex-theme-switchergit clone --depth 1 https://github.com/codexthemes/skillsWrote 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.
[](https://agentmods.dev/skills/codexthemes/skills/codex-theme-switcher)<a href="https://agentmods.dev/skills/codexthemes/skills/codex-theme-switcher"><img src="https://agentmods.dev/badge/skills/codexthemes/skills/codex-theme-switcher/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/codexthemes/skills/codex-theme-switcher"><img src="https://agentmods.dev/badge/skills/codexthemes/skills/codex-theme-switcher.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket warn
- Snyk warn
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 | $0.00075 | $0.01558 |
| Opus 5.5 | $0.00030 | $0.00623 |
| Sonnet 5.5 | $0.00015 | $0.00312 |
| Haiku 4.5 | $0.00007 | $0.00156 |
Grade A, and why
codex-theme-switcher 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Switch the active Codex theme
Apply a theme from the managed local library ~/.codexthemes/themes/<theme-id>/ to the running Codex desktop app, switch between installed themes, restore the native look, and verify what is actually active. This skill is standalone: its TypeScript scripts own the reversible injection runtime. It does not create or edit themes (codex-theme-creator), install them from the gallery (codex-theme-installer), or publish them (codex-theme-submitter). The only required local tools are Node.js 20+, npx, and the official Codex desktop app.
Run all commands from the installed skill directory. The runtime injects only an owned <style> element over Codex's loopback-only debugging endpoint; it never modifies the signed app bundle, and it themes every open Codex page, not just one window.
Step 1: pick the theme
npx tsx scripts/switch-theme.ts list
Lists every installed theme (id, name, layout mode) and which one is currently active. Themes arrive in the library from codex-theme-creator (created locally) or codex-theme-installer (downloaded from codexthemes.ai). If the theme the user wants is not listed, hand off to those skills instead of guessing paths.
Step 2: apply or switch
npx tsx scripts/switch-theme.ts apply <theme-id>
- If Codex is already exposing its debugging endpoint (it is after any previous themed launch), this hot-swaps the theme in place on every open page — no restart, output
{"status": "active", "pagesThemed": n}. - If there is no endpoint (first apply of this app session, or Codex was fully quit), ask the user for explicit permission to restart Codex, then rerun with
--launch:
npx tsx scripts/switch-theme.ts apply <theme-id> --launch
--launch prints {"status": "scheduled"} and hands the quit → relaunch → inject sequence to a detached helper that survives the restart (an agent hosted inside Codex dies with it; expect the tool call to be interrupted). Never build your own restart mechanism — no shell wrappers, launchd or scheduled tasks, or script copies; the helper already survives the restart.
What ships with it
5 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.
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.
- 2mo ago First seen · 83 lines · 75 tokens per session scan A 41dd651e98eb
codex-theme-switcher is a skill published in the GitHub repository codexthemes/skills (7 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 75 tokens to every session and 1,558 once invoked, about $0.0003 per session on Opus 5.5. 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.
codex-theme-switcher compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| codex-theme-switchercodexthemes/skills | Skill | 7 | 3mo ago | Apache-2.0 | A | 75 | Codex |
| webgl-holographic-foilnexu-io/open-design | Skill | 106k | today | Apache-2.0 | A | 41 | Claude Code, Codex |
| html-ppt-hermes-cyber-terminalnexu-io/open-design | Skill | 106k | today | Apache-2.0 | A | 53 | Claude Code, Codex |
| html-ppt-taste-brutalistnexu-io/open-design | Skill | 106k | today | Apache-2.0 | A | 78 | Claude Code, Codex |
| visual-ralphYeachan-Heo/oh-my-codex | Skill | 34k | today | MIT | A | 52 | Codex |
| glance-canonical-layoutsandroid/skills | Skill | 10k | yesterday | Apache-2.0 | A | 56 | Claude Code |
| accessibilitymicrosoft/hve-core | Skill | 1.6k | yesterday | MIT | A | 47 | Claude Code |