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 agentmods add skills/lianghsun/open-sheet/create-themenpx skills add lianghsun/open-sheet --skill create-themegit clone --depth 1 https://github.com/lianghsun/open-sheetWhat 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 | $0.00061 | $0.00456 |
| Opus 5 | $0.00030 | $0.00228 |
| Sonnet 5 | $0.00012 | $0.00091 |
| Haiku 4.5 | $0.00006 | $0.00046 |
Grade A, and why
create-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 3d 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.
What it actually says
Create a theme
A theme is a house style that workbooks link to with meta.theme. It lives as
markdown so it is readable by both people and agents.
The file
themes/<id>.md:
---
name: corporate-neutral
description: Near-white, one blue accent, sans throughout.
---
# Corporate neutral
## Palette
| Token | Value | Used for |
| --- | --- | --- |
| ink | #0f172a | body text, table header fill |
| accent | #1d4ed8 | KPI values, data bars |
| band | #f8fafc | total rows, key-value fills |
| rule | #cbd5e1 | hairlines |
## Formats
Currency `#,##0` · Percent `0.0%` · Dates `yyyy-mm-dd`
## Paste-ready design const
```tsx
export const design: DesignSystem = { … }
Conventions
- Assumptions always on their own sheet, key-value
- Data bars on the primary magnitude column only
- Column widths: labels 24, figures 14
Optionally add `themes/<id>.demo.tsx` — a small workbook exercising the theme, so
the gallery has something to show.
## Rules that matter for print and Excel alike
- **One accent colour.** A second one competes; a third is decoration.
- **White or near-white background.** Anything darker costs toner and makes
Excel's own selection highlight unreadable.
- **Body text no smaller than 10pt.** Spreadsheets get printed and squinted at.
- **Number formats are part of the theme.** A house style that leaves ratios
unformatted has not done its job.
- Keep the `design` const a plain object literal so the Design panel can rewrite it.
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.
- 3d ago First seen · 57 lines · 61 tokens per session scan A c45523490c7f
create-theme is a skill published in the GitHub repository lianghsun/open-sheet (120 stars, last pushed 7d ago), licensed MIT. It adds 61 tokens to every session and 456 once invoked, about $0.0003 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 2026-08-30.
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