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-creatorgit 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-creator)<a href="https://agentmods.dev/skills/codexthemes/skills/codex-theme-creator"><img src="https://agentmods.dev/badge/skills/codexthemes/skills/codex-theme-creator/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-creator"><img src="https://agentmods.dev/badge/skills/codexthemes/skills/codex-theme-creator.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 | $0.00086 | $0.03863 |
| Opus 5.5 | $0.00034 | $0.01545 |
| Sonnet 5.5 | $0.00017 | $0.00773 |
| Haiku 4.5 | $0.00009 | $0.00386 |
Grade A, and why
codex-theme-creator 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 — 232 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create a Codex theme
Create a reversible decorative theme without modifying app.asar, the signed app bundle, WindowsApps, user tasks, or authentication data. Preserve native layout and interaction behavior unless the chosen layout mode explicitly permits a bounded composition change.
Authority boundary
Use this skill as the sole design and QA authority for a new Codex theme. Do not read, copy, or combine another installed theme skill, finished theme manifest, finished theme CSS, or local theme collection unless the user explicitly names that source. Do not describe the workflow as combining this skill with “local theme conventions.” Start from this skill's matching skeleton and the user's brief or reference image.
This skill is standalone. Its TypeScript scripts own scaffolding, validation, reversible session application, and restore. Never detect, invoke, read configuration from, or claim a dependency on CodeDrobe, Dream/Fiona, or another theme injector unless the user explicitly asks to use that product. Do not reuse their marker names or runtime data. The only required local tools are Node.js, npx, and the official Codex desktop app.
Managed storage
Keep every generated theme file in the managed library ~/.codexthemes unless the user explicitly requests another location:
- editable source and artwork:
~/.codexthemes/themes/<theme-id>/ - previews:
~/.codexthemes/themes/<theme-id>/previews/ - shareable packages:
~/.codexthemes/exports/ - runtime state:
~/.codexthemes/state/
Never create a staging, scratch, or temporary copy of theme files in or near the current workspace (for example a .codexthemes-stage directory). If the sandbox or permission mode blocks writing to ~/.codexthemes, ask the user to approve writing there instead of writing somewhere else first and moving files later.
Read the required references
Before creating or substantially redesigning a theme, read these files completely:
references/design-playbook.md: layout modes, semantic palette, selectors, and surface coverage.references/qa-checklist.md: real-app acceptance matrix and hard failures.references/theme-schema.md: manifest and portable package contract.references/asset-rights.md: user-material handling and submission handoff.
What ships with it
18 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.
- agents/openai.yaml 297 B
- assets/editorial-showcase.css 3.2 KB
- assets/native-background.css 1.6 KB
- assets/native-immersive.css 10 KB
- assets/palette-only.css 2.7 KB
- references/asset-rights.md 852 B
- references/design-playbook.md 13 KB
- references/qa-checklist.md 5.3 KB
- references/theme-schema.md 3.8 KB
- scripts/apply-theme.ts 24 KB runs code
- scripts/export-theme.ts 5.5 KB runs code
- scripts/paths.ts 611 B runs code
- scripts/qa-contrast.ts 11 KB runs code
- scripts/readability.ts 8.8 KB runs code
- scripts/scaffold-theme.ts 6.7 KB runs code
- scripts/self-test.ts 5.5 KB runs code
- scripts/validate-skill.ts 3.6 KB runs code
- scripts/validate-theme.ts 10 KB runs code
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 · 232 lines · 86 tokens per session scan A 1c76ed35931f
codex-theme-creator is a skill published in the GitHub repository codexthemes/skills (7 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 86 tokens to every session and 3,863 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-creator compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| codex-theme-creatorcodexthemes/skills | Skill | 7 | 3mo ago | Apache-2.0 | A | 86 | Codex |
| webgl-holographic-foilnexu-io/open-design | Skill | 106k | yesterday | Apache-2.0 | A | 41 | Claude Code, Codex |
| html-ppt-hermes-cyber-terminalnexu-io/open-design | Skill | 106k | yesterday | Apache-2.0 | A | 53 | Claude Code, Codex |
| html-ppt-taste-brutalistnexu-io/open-design | Skill | 106k | yesterday | Apache-2.0 | A | 78 | Claude Code, Codex |
| visual-ralphYeachan-Heo/oh-my-codex | Skill | 34k | 4d ago | 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 |