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 chuancyzhang/deepseek-cowork --skill theme-customizergit clone --depth 1 https://github.com/chuancyzhang/deepseek-coworkWrote 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/chuancyzhang/deepseek-cowork/theme-customizer)<a href="https://agentmods.dev/skills/chuancyzhang/deepseek-cowork/theme-customizer"><img src="https://agentmods.dev/badge/skills/chuancyzhang/deepseek-cowork/theme-customizer/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/chuancyzhang/deepseek-cowork/theme-customizer"><img src="https://agentmods.dev/badge/skills/chuancyzhang/deepseek-cowork/theme-customizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00058 | $0.00890 |
| Opus 5.5 | $0.00023 | $0.00356 |
| Sonnet 5.5 | $0.00012 | $0.00178 |
| Haiku 4.5 | $0.00006 | $0.00089 |
Grade A, and why
theme-customizer 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 1mo 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 — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Theme Customizer
Use the theme domain tools instead of editing QSS, DesignTokens, theme packages, or application code.
Each saved user theme is one validated .cowork-theme package. Its manifest has one fixed workspace_scene background owner plus semantic tokens, surface materials, controlled component layout, icon presentation, visibility, and whitelisted display copy.
Workflow
- Call
inspect_ui_themebefore proposing changes. Reuse the returned token names and current values. - Translate the user's visual intent into the smallest meaningful token and manifest override set. Put every workspace image, grid, stripe, dot, or noise layer in the single
workspace_scene; use surface materials only for transparent, tinted, or opaque functional regions. - When an existing local PNG, JPEG, GIF, or WebP is needed, create a preview first and call
import_ui_theme_asset. Static PNG/JPEG/WebP assets may be referenced byworkspace_sceneor an icon; GIF and animated WebP assets may only be referenced by the singleworkspace_sceneimage layer. Cowork does not generate raster images in this workflow. - Call
validate_ui_themeand fix validation errors before previewing. - Call
preview_ui_themeso the user can inspect the result in the running app. - Describe the preview briefly and ask what to adjust. Use
patch_ui_theme_previewwith the currentpreview_idandpreview_revisionfor incremental changes. Each patch or asset change creates a new revision. Useclear_ui_theme_previewwhen the user rejects it. - Call
save_ui_theme_previewwith the exact acceptedpreview_idandpreview_revisiononly after the user explicitly accepts that revision. The tool performs its own approval check. - Use
activate_ui_themeordelete_ui_themeonly for an explicit request; both tools confirm the action. - After a successful save-and-activate or activation, explicitly recommend restarting Cowork so every existing surface loads the theme completely.
Guardrails
What ships with it
3 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.
- 1mo ago First seen · 39 lines · 58 tokens per session scan A 7b8119e6f7dc
theme-customizer is a skill published in the GitHub repository chuancyzhang/deepseek-cowork (18 stars, last pushed today), licensed Apache-2.0. It adds 58 tokens to every session and 890 once invoked, about $0.0002 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 2026-09-04.
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