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 decocms/studio --skill xlsxgit clone --depth 1 https://github.com/decocms/studioWrote 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/decocms/studio/xlsx)<a href="https://agentmods.dev/skills/decocms/studio/xlsx"><img src="https://agentmods.dev/badge/skills/decocms/studio/xlsx/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/decocms/studio/xlsx"><img src="https://agentmods.dev/badge/skills/decocms/studio/xlsx.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00030 | $0.00224 |
| Opus 5.5 | $0.00012 | $0.00090 |
| Sonnet 5.5 | $0.00006 | $0.00045 |
| Haiku 4.5 | $0.00003 | $0.00022 |
Grade A, and why
xlsx 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 18d 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
xlsx — Excel spreadsheets
Use this skill to read or summarize .xlsx files.
Scripts
extract.py
Print sheet contents from an .xlsx as TSV. Each sheet is preceded by a
--- sheet "<name>" --- header.
python /app/org/public/core/xlsx/extract.py <path-to-file.xlsx>
Empty trailing rows and columns are trimmed. Cell values are stringified; formulas show their cached value, not the formula text.
Direct openpyxl usage
For richer operations (formulas, formatting, charts, writing workbooks),
import openpyxl directly. The library is preinstalled.
from openpyxl import load_workbook
wb = load_workbook("/path/to/file.xlsx", data_only=True)
for sheet in wb.worksheets:
for row in sheet.iter_rows(values_only=True):
...
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.
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.
- 18d ago Changed 241ef44cffab
- 1mo ago First seen · 36 lines · 30 tokens per session scan A 9871f8e8c5b6
xlsx is a skill published in the GitHub repository decocms/studio (410 stars, last pushed today), licensed MIT. It adds 30 tokens to every session and 224 once invoked, about $0.0001 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 2026-08-30.
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